Gigamon (GIMO) 10-K 24 Feb 16 2015 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($) $ in Millions	12 Months Ended
	Dec. 26, 2015	Feb. 15, 2016	Jun. 27, 2015
Document Information [Line Items]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 26, 2015
Document Fiscal Year Focus	2,015
Document Fiscal Period Focus	FY
Trading Symbol	GIMO
Entity Registrant Name	GIGAMON INC.
Entity Central Index Key	1,484,504
Current Fiscal Year End Date	--12-26
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		34,452,344
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Public Float			$ 988.1

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 26, 2015	Dec. 27, 2014
CURRENT ASSETS:
Cash and cash equivalents	$ 120,212	$ 38,941
Short-term investments	90,001	110,465
Accounts receivable, net of allowance for doubtful accounts of $309 and $0 as of December 26, 2015 and December 27, 2014, respectively	47,947	28,686
Inventories	3,813	6,551
Deferred tax assets	0	150
Prepaid expenses and other current assets	7,621	5,316
Total current assets	269,594	190,109
Property and equipment, net	9,416	7,387
Deferred tax assets, non-current	135	64
Other assets, non-current	766	426
TOTAL ASSETS	279,911	197,986
CURRENT LIABILITIES:
Accounts payable	3,724	2,391
Accrued liabilities	37,334	22,838
Deferred revenue	62,248	42,183
Gigamon LLC members’ distribution payable	0
Total current liabilities	103,306	67,412
Deferred revenue, non current	19,883	13,322
Deferred and other tax liabilities, non-current	279	150
Other liabilities, non-current	1,087	1,667
TOTAL LIABILITIES	$ 124,555	$ 82,551
Commitments and Contingencies (Note 6)
STOCKHOLDERS’ EQUITY
Preferred stock—$0.0001 par value; 20,000 shares authorized, no shares issued or outstanding as of December 26, 2015 and December 27, 2014	$ 0	$ 0
Common stock—$0.0001 par value; 1,000,000 shares authorized, 34,323 and 32,642 shares issued and outstanding as of December 26, 2015 and December 27, 2014, respectively	3	3
Treasury stock—No par value; 8,110 shares authorized and outstanding as of December 26, 2015 and December 27, 2014	(12,469)	(12,469)
Additional paid-in capital	211,402	177,714
Accumulated other comprehensive loss	(47)	(94)
Accumulated deficit	(43,533)	(49,719)
TOTAL STOCKHOLDERS’ EQUITY	155,356	115,435
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$ 279,911	$ 197,986

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 26, 2015	Dec. 27, 2014
Statement of Financial Position [Abstract]
Accounts Receivable, allowance	$ 309	$ 0
Preferred stock, par value	$ 0.0001	$ 0.0001
Preferred stock, shares authorized	20,000,000	20,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	1,000,000,000	1,000,000,000
Common stock, shares issued	34,323,457	32,641,500
Common stock, shares outstanding	34,323,457	32,641,500
Treasury stock, shares authorized and outstanding	8,109,848

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 26, 2015	Sep. 26, 2015	Jun. 27, 2015	Mar. 28, 2015	Dec. 27, 2014	Sep. 27, 2014	Jun. 28, 2014	Mar. 29, 2014	Dec. 26, 2015	Dec. 27, 2014	Dec. 28, 2013
Revenue:
Product	$ 47,051	$ 38,717	$ 34,814	$ 32,152	$ 36,790	$ 26,180	$ 22,544	$ 20,080	$ 152,734	$ 105,594	$ 101,717
Service	19,973	17,935	16,632	14,701	14,461	13,088	12,307	11,680	69,241	51,536	38,578
Total revenue	67,024	56,652	51,446	46,853	51,251	39,268	34,851	31,760	221,975	157,130	140,295
Cost of revenue:
Product	10,262	9,613	9,558	9,445	10,319	7,396	6,281	7,005	38,878	31,001	26,103
Service	1,669	1,708	1,763	1,777	1,722	1,601	1,544	1,580	6,917	6,447	4,727
Total cost of revenue	11,931	11,321	11,321	11,222	12,041	8,997	7,825	8,585	45,795	37,448	30,830
Gross profit	55,093	45,331	40,125	35,631	39,210	30,271	27,026	23,175	176,180	119,682	109,465
Operating expenses:
Research and development	13,171	12,677	12,227	11,496	10,922	10,086	10,860	10,938	49,571	42,806	42,067
Sales and marketing	26,150	21,388	21,171	18,832	20,387	17,948	19,558	18,170	87,541	76,063	72,024
General and administrative	7,788	6,950	6,702	6,019	5,015	5,217	4,446	6,005	27,459	20,683	25,575
Total operating expenses	47,109	41,015	40,100	36,347	36,324	33,251	34,864	35,113	164,571	139,552	139,666
Income (loss) from operations	7,984	4,316	25	(716)	2,886	(2,980)	(7,838)	(11,938)	11,609	(19,870)	(30,201)
Interest income	116	106	105	119	92	82	73	61	446	308	95
Other expense, net	(119)	(69)	7	(10)	(31)	(28)	6	(41)	(191)	(94)	(94)
Income (loss) before income tax (provision) benefit	7,981	4,353	137	(607)	2,947	(2,926)	(7,759)	(11,918)	11,864	(19,656)	(30,200)
Income tax (provision) benefit	(5,418)	(73)	(99)	(88)	(41)	(66)	(24,727)	3,700	(5,678)	(21,134)	20,663
Net Income (loss)	$ 2,563	$ 4,280	$ 38	$ (695)	$ 2,906	$ (2,992)	$ (32,486)	$ (8,218)	6,186	(40,790)	(9,537)
Accretion of preferred stock to redemption value and issuance costs									0	0	(1,088)
Earnings distributable to preferred stockholders									0	0	1,107
Net income (loss) attributable to common stockholders									$ 6,186	$ (40,790)	$ (9,518)
Net (loss) income per share attributable to common stockholders:
Basic (in dollars per share)	$ 0.07	$ 0.13	$ 0	$ (0.02)	$ 0.09	$ (0.09)	$ (1.01)	$ (0.26)	$ 0.18	$ (1.27)	$ (0.39)
Diluted (in dollars per share)	$ 0.07	$ 0.12	$ 0	$ (0.02)	$ 0.09	$ (0.09)	$ (1.01)	$ (0.26)	$ 0.17	$ (1.27)	$ (0.39)
Weighted average shares used in computing net (loss) income per share attributable to common stockholders:
Basic (in shares)									33,618	32,200	24,722
Diluted (in shares)									35,866	32,200	24,722

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 26, 2015	Dec. 27, 2014	Dec. 28, 2013
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 6,186	$ (40,790)	$ (9,537)
Other comprehensive income (loss):
Change in unrealized gain (loss) on available-for-sale investments	47	(117)	23
Comprehensive income (loss)	6,233	(40,907)	(9,514)
Accretion of preferred units to redemption value and issuance costs	0	0	(1,088)
Earnings distributable to preferred stockholders	0	0	1,107
Comprehensive income (loss) attributable to common stockholders	$ 6,233	$ (40,907)	$ (9,495)

Consolidated Statements of Rede

Consolidated Statements of Redeemable Convertible Preferred Units and Stockholders' Equity - USD ($) $ in Thousands	Total	Common Units	Preferred Units	Common Shares	Treasury Stock	Additional Paid-In Capital	Other Comprehensive Income (Loss)	Accumulated Deficit	IPO	IPOCommon Shares	IPOAdditional Paid-In Capital	Follow On Public Offering	Follow On Public OfferingCommon Shares	Follow On Public OfferingAdditional Paid-In Capital
Beginning Balance (in shares) at Dec. 31, 2012		17,300,000	8,110,000
Beginning Balance at Dec. 31, 2012	$ (30,045)	$ 1,625	$ 28,344		$ (12,469)	$ 1,522		$ (20,723)
Distribution to Gigamon LLC members	(2,676)							(2,676)
Stock-based compensation expense	32,543					32,543
Conversion from LLC to corporation (in shares)		(17,300,000)		16,852,000
Conversion from LLC to corporation	0	$ (1,625)		$ 1		(22,383)		24,007
Conversion of preferred stock to common stock (in shares)			(8,110,000)	8,110,000
Conversion of preferred stock to common stock	$ 29,432		$ (29,432)	$ 1		29,431
Issuance of common stock (in shares)										5,513,000			300,000
Issuance of common stock									$ 93,361	$ 1	$ 93,360	$ 10,224		$ 10,224
Issuance of common stock upon exercise of stock options (in shares)	344,592			344,000
Issuance of common stock upon exercise of stock options	$ 1,719					1,719
Issuance of common stock upon vesting of RSUs (in shares)				51,000
Issuance of common stock upon vesting of RSUs	0					0
Shares repurchased for tax withholdings on vesting of RSUs (in shares)				(18,000)
Shares repurchased for tax withholdings on vesting of RSUs	(518)					(518)
Net income (loss)	(9,537)							(9,537)
Other comprehensive income (loss)	23						$ 23
Accretion of preferred units to redemption value and issuance costs	(1,088)		$ 1,088			(1,088)
Ending Balance (in shares) at Dec. 28, 2013		0	0	31,152,000
Ending Balance at Dec. 28, 2013	123,438	$ 0	$ 0	$ 3	(12,469)	144,810	23	(8,929)
Stock-based compensation expense	24,800					24,800
Conversion of preferred stock to common stock	$ 0
Issuance of common stock upon exercise of stock options (in shares)	790,147			791,000
Issuance of common stock upon exercise of stock options	$ 5,351					5,351
Issuance of common stock related to employee stock purchase plan (in shares)				458,000
Issuance of common stock related to employee stock purchase plan	5,878					5,878
Issuance of common stock upon vesting of RSUs (in shares)				397,000
Shares repurchased for tax withholdings on vesting of RSUs (in shares)				(156,000)
Shares repurchased for tax withholdings on vesting of RSUs	(3,125)					(3,125)
Net income (loss)	(40,790)							(40,790)
Other comprehensive income (loss)	(117)						(117)
Ending Balance (in shares) at Dec. 27, 2014		0	0	32,642,000
Ending Balance at Dec. 27, 2014	115,435	$ 0	$ 0	$ 3	(12,469)	177,714	(94)	(49,719)
Stock-based compensation expense	29,663					29,663
Conversion of preferred stock to common stock	$ 0
Issuance of common stock upon exercise of stock options (in shares)	523,398			523,000
Issuance of common stock upon exercise of stock options	$ 4,403					4,403
Issuance of common stock related to employee stock purchase plan (in shares)				527,000
Issuance of common stock related to employee stock purchase plan	5,099					5,099
Issuance of common stock upon vesting of RSUs (in shares)				1,011,000
Shares repurchased for tax withholdings on vesting of RSUs (in shares)				(380,000)
Shares repurchased for tax withholdings on vesting of RSUs	(10,183)					(10,183)
Excess tax benefit from employee stock-based compensation plans	4,706					4,706
Net income (loss)	6,186							6,186
Other comprehensive income (loss)	47						47
Ending Balance (in shares) at Dec. 26, 2015		0	0	34,323,000
Ending Balance at Dec. 26, 2015	$ 155,356	$ 0	$ 0	$ 3	$ (12,469)	$ 211,402	$ (47)	$ (43,533)

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 26, 2015	Dec. 27, 2014	Dec. 28, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ 6,186	$ (40,790)	$ (9,537)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	5,577	5,278	2,850
Stock-based compensation expense	29,768	24,658	32,543
Deferred and other income taxes	208	20,825	(20,889)
Excess tax benefit from employee stock-based compensation	(4,706)	0	0
Inventory write-down	1,859	3,760	852
(Gain) loss on disposal of fixed assets	(17)	0	14
Provision for doubtful accounts	309	0	0
Changes in operating assets and liabilities:
Accounts receivable	(19,570)	(4,158)	(3,851)
Inventories	950	(8,229)	1,400
Prepaid expenses and other assets	(2,988)	(950)	(3,274)
Accounts payable	1,265	963	(1,758)
Accrued liabilities and other liabilities	17,966	1,709	8,302
Deferred revenue	26,626	8,029	16,656
Net cash provided by operating activities	63,433	11,095	23,308
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of short-term investments	(61,725)	(87,698)	(59,725)
Proceeds from sales of short-term investments	2,006	3,010	2,000
Proceeds from maturities of short-term investments	79,821	32,607	0
Purchase of property and equipment	(6,289)	(7,614)	(4,042)
Net cash provided by (used in) investing activities	13,813	(59,695)	(61,767)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from employee stock purchase plan	5,099	5,878	0
Proceeds from exercise of stock options	4,403	5,364	1,719
Proceeds from (costs paid for) initial public offering, net	0	(8)	95,280
Proceeds from follow-on public offering, net	0	0	10,232
Shares repurchased for tax withholdings on vesting of restricted stock units	(10,183)	(3,125)	(518)
Excess tax benefit from employee stock-based compensation	4,706	0	0
Distribution of income to Gigamon LLC members	0	(476)	(7,021)
Net cash provided by financing activities	4,025	7,633	99,692
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	81,271	(40,967)	61,233
CASH AND CASH EQUIVALENTS — Beginning of period	38,941	79,908	18,675
CASH AND CASH EQUIVALENTS — End of period	120,212	38,941	79,908
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Income taxes paid during the period	738	484	173
NONCASH INVESTING AND FINANCING ACTIVITIES:
Conversion of preferred stock into common stock	0	0	29,432
Accretion of preferred units to redemption value and issuance costs discount	0	0	1,088
Unpaid property and equipment purchases	756	207	558
Unpaid public offering costs	$ 0	$ 0	$ 8

Description of the Company

Description of the Company	12 Months Ended
	Dec. 26, 2015
Accounting Policies [Abstract]
Description of the Company	Description of the Company The Company Gigamon Inc. (the “Company”) designs, develops and sells products and services that together provide customers with visibility and control of network traffic. The Company serves global enterprises and service providers that seek to maintain and improve the security, reliability and performance of their network infrastructure. The business was founded in 2004 and was originally operated by Gigamon Systems LLC, a California limited liability company or Gigamon Systems. In January 2009, the Company was formed as a limited liability company or Gigamon LLC, in the state of Delaware and Gigamon Systems contributed substantially all of its assets and liabilities to Gigamon LLC in exchange for all of Gigamon LLC’s common units. On May 31, 2013, the Company converted from a Delaware limited liability company into a Delaware corporation and changed the Company’s name from Gigamon LLC to Gigamon Inc. (the LLC Conversion).

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 26, 2015
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Basis of Presentation and Consolidation The Company prepared its consolidated financial statements in accordance with U.S. generally accepted accounting principles or GAAP and applicable rules and regulations of the Securities and Exchange Commission or the SEC. The consolidated financial statements include the accounts of the Company and its wholly owned subsidiaries. All intercompany accounts and transactions have been eliminated in consolidation. Change in Fiscal Year End Effective January 1, 2013, the Company changed its reporting period from a calendar year ending on December 31 of each year to a 52- or 53-week fiscal year that ends on the last Saturday in December. Fiscal years 2015 , 2014 , and 2013 were each 52-week fiscal years ending on December 26, 2015 , December 27, 2014 , and December 28, 2013 , respectively, with each quarter in these fiscal years a 13-week quarter. Out-of-Period Adjustments During the year ended December 26, 2015 the Company recorded $0.6 million of out-of-period adjustments that are primarily related to sales and marketing expenses for fiscal 2015. The Company has concluded that these out-of-period adjustments were not material to the previously issued consolidated financial statements or current financial statements. Use of Estimates The preparation of consolidated financial statements in conformity with GAAP requires management to make certain estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenues and expenses during the reported periods. On an ongoing basis, the Company evaluates its estimates, including but not limited to those related to revenue recognition, provision for doubtful accounts, warranty reserve, excess and obsolete inventory write-downs, stock-based compensation expense, depreciable lives, and income taxes. The Company bases its estimates on historical experience, projections for future performance and other assumptions that it believes to be reasonable under the circumstances. Actual results could differ materially from those estimates. Reverse Stock Split Effective May 20, 2013, the Company completed a one-for-three reverse stock split, as approved by its Board of Directors (the “Board”). All shares and per share amounts set forth herein give effect to this reverse stock split. Foreign Currency The Company uses the U.S. dollar as its functional currency. Foreign currency assets and liabilities are remeasured into U.S. dollars using the end-of-period exchange rates except for nonmonetary assets and liabilities, which are remeasured using historical exchange rates. Expenses are remeasured using an average exchange rate for the respective period. Gains or losses from foreign currency transactions are included in other expense, net. Foreign currency transaction gains and losses have not been material to the consolidated financial statements for all periods presented. Cash Equivalents and Marketable Securities All highly liquid marketable securities with original maturities of less than three months at the date of purchase are considered to be cash equivalents. Marketable securities are generally classified as available-for-sale for use in current operations, if required, and are reported at fair value, with unrealized gains and losses, net of tax, presented as a separate component of stockholders’ equity within accumulated other comprehensive income (loss). All realized gains and losses and unrealized losses resulting from declines in fair value that are other-than-temporary are recorded in other income (expense), net, in the period of occurrence. The Company uses the specific identification method to determine the realized gains and losses on investments. For all investments in marketable securities, the Company assesses whether the impairment is other-than-temporary. If the fair value of a security is less than its amortized cost basis, an impairment is considered other-than-temporary if (i) the Company has the intent to sell the security or it is more likely than not that the Company will be required to sell the security before recovery of its entire amortized cost basis, or (ii) the Company does not expect to recover the entire amortized cost of the security. If an impairment is considered other-than-temporary based on condition (i), the entire difference between the amortized cost and the fair value of the security is recognized in earnings. If an impairment is considered other-than-temporary based on condition (ii), the amount representing credit losses, defined as the difference between the present value of the cash flows expected to be collected and the amortized cost basis of the security, will be recognized in earnings, and the amount relating to all other factors will be recognized in accumulated other comprehensive income (loss). The Company evaluates both qualitative and quantitative factors such as duration and severity of the unrealized losses, credit ratings, default and loss rates of the underlying collateral, structure and credit enhancements to determine if a credit loss may exist. Fair Value of Financial Instruments The Company records its financial assets and liabilities at fair value. The accounting guidance for fair value provides a framework for measuring fair value, clarifies the definition of fair value, and expands disclosures regarding fair value measurements. Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability (an exit price) in an orderly transaction between market participants at the reporting date. The accounting guidance establishes a three-tiered hierarchy, which prioritizes the inputs used in the valuation methodologies in measuring fair value: Level 1 – Quoted prices in active markets for identical assets or liabilities. Level 2 – Inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. Level 3 – Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. The Company recognizes transfers among Level 1, Level 2 and Level 3 classifications as of the actual date of the events or change in circumstances that caused the transfers. The Company’s financial instruments, including cash equivalents, accounts receivable, accounts payable and accrued liabilities have carrying amounts which approximate fair value due to the short-term maturity of these instruments. Accounts Receivable Accounts receivable, which represent trade accounts receivable from both channel partners and direct customers, are recorded at the invoiced amounts and do not bear interest. The Company extends credit to its customers in the normal course of business and performs ongoing credit evaluations of its customers. The Company generally requires no collateral from its customers. The Company reviews its accounts receivable to determine if it needs to establish an allowance for doubtful accounts for estimated losses resulting from the customer’s inability to make payments. Management determines the collectability of specific customer accounts by their past transaction history. If financial conditions of the Company’s customers were to deteriorate, adversely affecting their ability to make payments, additional allowances would be required. Estimates for allowance for doubtful accounts are charged to operating expenses and a credit to a valuation allowance. As of December 26, 2015 and December 27, 2014 the Company recorded an allowance for doubtful accounts of $0.3 million , and zero , respectively. Concentrations The Company operates in highly competitive and rapidly changing markets that could negatively impact the Company’s operating results. A number of components that meet the Company’s manufacturing requirements are available only from single source suppliers. In addition, the Company relies on one contract manufacturer to manufacture substantially all of its products. The inability of its single source suppliers and contract manufacturer to provide the Company with adequate supplies of high-quality components and products could cause a delay in order fulfillment, which could adversely affect the Company’s revenue, cost of revenue and operating results. Financial instruments that potentially subject the Company to significant concentrations of credit risk consist principally of cash, cash equivalents, short-term investments and accounts receivable. The majority of the Company's cash, cash equivalents and short-term investments are held in or managed by a limited number of major financial institutions in the United States that management believes are creditworthy. Such deposits may exceed the insured limits provided on them. The Company mitigates credit risk associated with its accounts receivable by performing ongoing credit evaluations of its customers and determines if it needs to establish an allowance for doubtful accounts for estimated losses based on management’s assessment of the collectability of customer accounts. The Company sells its products primarily through channel partners, including distributors and resellers, and occasionally directly to end-user customers. For fiscal 2015 , 2014 and 2013 , no end-user customer accounted for 10% or more of revenue. Customers that represented more than 10% of total revenue and accounts receivable are: Fiscal Year Ended December 26, 2015 December 27, 2014 December 28, 2013 Percent of Revenue: Customer A (distributor) 40 % 47 % 52 % Customer B (distributor) 21 % 16 % * * Represents less than 10% of total revenue As of December 26, 2015 December 27, 2014 Percent of Accounts Receivable: Customer A (distributor) 19 % * Customer B (distributor) 30 % 36 % Customer C (end-user) 11 % * * Represents less than 10% of total accounts receivable Inventories Inventory is valued at the lower of cost computed on a first-in, first-out basis, or market value. The Company writes down inventory in excess of forecasted demand over a certain period, as a component of cost of revenue. In these cases, inventory is reduced to estimated realizable value based on historical usage and expected demand. At the point of inventory write-down, a new lower-cost basis for that inventory is established and subsequent changes in facts and circumstances do not result in the restoration or increase in that newly established cost basis. Inherent in the Company’s estimates of market value in determining inventory valuation are estimates related to economic trends, future demand for the Company’s products, and technical obsolescence of products. The Company uses a contract manufacturer to provide manufacturing services for its products. During the normal course of business, in order to manage manufacturing lead times and help ensure adequate component supply, the Company enters into agreements with the contract manufacturer that either allow it to procure inventory based upon criteria as defined by the Company, or establish the parameters defining the Company’s requirements. A portion of the Company’s reported purchase commitments arising from these agreements consists of non-cancelable commitments. The Company records a liability for firm, non-cancelable and unconditional purchase commitments for quantities in excess of its future demand forecasts consistent with the valuation of the Company’s excess and obsolete inventory. In fiscal 2015 , the Company recognized $1.9 million of inventory write-downs within cost of revenue and $0.9 million in recoveries from the sale of previously written-down inventory. The Company recorded inventory write-downs of $3.8 million and $0.9 million in fiscal 2014 and fiscal 2013 , respectively, as a component of cost of revenue. Property and Equipment Property and equipment are stated at cost and depreciated using the straight–line method over the estimated useful lives of the assets. Leasehold improvements are amortized over the lesser of the useful life of these improvements or the remaining term of the lease. Maintenance and repairs are charged to operations as incurred. The useful lives of the property and equipment are as follows: Furniture and fixtures 5 years Software 3 to 5 years Equipment and machinery 1.5 to 3 years Leasehold improvements Shorter of lease term or estimated useful life Research and Development and Software Development Costs Research and development costs are expensed as incurred. The Company's software development process is essentially completed concurrent with the establishment of technological feasibility. To-date, software development costs qualifying for capitalization have not been material. Accordingly, the Company has not capitalized any software development costs. Impairment of Long-Lived Assets The Company reviews long-lived assets for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Recoverability is measured by comparison of the anticipated future net undiscounted cash flows to the related assets’ carrying values. If such assets are considered to be impaired, the impairment to be recognized is measured by the amount by which the carrying amount of the assets exceeds the projected discounted future net cash flows arising from the asset. No assets were determined to be impaired during any of the periods presented. Revenue Recognition The Company generates product revenue from sales of traffic visibility solutions to customers as well as service revenue from sales of maintenance and support contracts and other billable services. The Company typically sells products and services in a single transaction. The deliverables consist of traffic visibility solutions, maintenance and support, and other billable services. The Company’s typical arrangement includes the sale of one or multiple products that may include first year maintenance and support as well as standard warranty. Other arrangements consist of the sale of products together with maintenance and support or a renewal of maintenance and support contracts. Billable services are billed in advance or when service is provided and performed as requested by customers. Under maintenance and support contracts, services are provided as needed by customers over the fixed arrangement term. The Company does not grant its customers a general right of return or any refund terms, except to two of the Company’s distributors which have stock rotation rights and in that case, revenue is deferred until sell-through has occurred. Revenue from distributors is reported net of rebates, discounts and any other sales incentives. The Company recognizes revenue when (1) persuasive evidence of an arrangement exists, (2) delivery has occurred or services have been rendered, (3) the sales price is fixed or determinable and (4) collectability is reasonably assured. When sales arrangements contain multiple elements and software and non-software components that function together to deliver the products’ essential functionality, the Company allocates revenue to each element based on a selling price hierarchy: vendor-specific objective evidence or VSOE, if available, third party evidence or TPE, of the selling price if VSOE is not available, or best estimated selling prices or BESP if neither VSOE nor TPE is available. When the Company enters into arrangements to provide more than one product or service, or what the Company refers to as multiple deliverables, these arrangements are evaluated to determine if the multiple elements consist of more than one unit of accounting and can be separated accordingly. Based on separation criteria under the guidance, deliverables in multiple element arrangements can be segregated into separate units of accounting if they have value to the customer on a standalone basis. If deliverables can be separated into individual units of accounting, then the arrangement consideration is allocated among deliverables based on their relative selling price. Revenue from each deliverable is recognized when all requirements are met for that specific deliverable. If deliverables cannot be separated into separate units of accounting, then the arrangement will be accounted for as a single unit of accounting and revenue will be recognized when all requirements are met for all deliverables within the arrangement. The Company has established VSOE for maintenance and support contracts since the majority of selling prices fall within a narrow range when sold separately. TPE is not used since this information is not widely available in the market and the Company does not consider its products to be similar to or interchangeable with its competitors’ products in standalone sales to similarly situated customers. For deliverables with no established VSOE, such as standard product offerings, the Company determines the standalone selling price for such deliverables by establishing BESP, which incorporates historical selling prices, the effect of market conditions, gross margin objectives and pricing practices, as well as entity specific factors. The Company monitors and evaluates BESP on a regular basis to ensure that changes in circumstances are accounted for in a timely manner. Service revenue is recognized ratably over the contractual support period, which is typically one year but can be up to ten years . In accordance with contractual provisions, the Company may offer cooperative marketing funds based on a fixed dollar percentage of product sales to certain of its channel partners or to fund specific marketing activities for these partners. The Company records such amounts as a reduction to revenue or, if the Company has evidence of fair value of the separable and identifiable benefit received, as a marketing expense. Revenue is recorded net of sales taxes. Costs of products not yet recognized as revenue are deferred and included as a component of prepaid expenses and other current assets in the consolidated balance sheets. As of December 26, 2015 and December 27, 2014 , deferred cost of product revenue was $1.6 million and $0.8 million , respectively. Shipping and Handling Charges Shipping and handling costs are recorded in cost of revenue in the period products are shipped to customers. Warranty The Company provides five -year warranties on its hardware products against defects in manufacturing. The Company accrues for potential liability claims as a component of cost of product revenue based on historical trends of product failure rates and the expected material and labor costs to provide warranty services. The accrued warranty balance is reviewed periodically for adequacy and is included in accrued liabilities and in other non-current liabilities on the consolidated balance sheets. Stock-Based Compensation Stock-based compensation expense related to stock-based transactions, including employee and director awards, as well as employee stock purchase plan purchase rights (“ESPP purchase rights”), is measured and recognized in the consolidated financial statements based on fair value of the award on the grant date. Stock-based compensation expense related to equity awards that can be settled in cash is measured based on the fair value on each balance sheet date until the settlement dates. The fair value of option awards and ESPP purchase rights is estimated using the Black-Scholes option-pricing model. This model requires assumptions including the market value of the Company’s common stock, expected volatility, expected term of the award, expected dividend yield and risk-free interest rate. Expected term for stock option awards is determined based on the mid-point of the vest period and the contractual period of each option award due to the Company’s limited historical stock option exercise data. Expected volatility is established based on the historical volatility of the common stock of a peer group of publicly traded companies. The stock-based compensation expense, net of estimated forfeitures, is recognized on a graded-vesting basis over the requisite service periods of the awards, unless a performance-based condition exists. Expense for performance-based awards are recognized when the issuance of the underlying awards are probable. Expense for consultant awards are measured based on the fair value on the vest date. Expenses related to the option grants to consultants that have not been vested as of the reporting date are marked to market until the earlier of the commitment or the completion of the underlying performance. The Company estimates a forfeiture rate to calculate the stock-based compensation for its awards based on an analysis of its historical experience, analysis of employee turnover and other related factors. Advertising Costs Expenses related to advertising of products are charged to sales and marketing expense as incurred. For all periods presented, advertising expenses were not material. Income Taxes The Company is subject to U.S. federal income taxes as well as state taxes. In addition, the Company is subject to taxes in the foreign jurisdictions where it operates. Prior to the LLC Conversion in May 2013, the Company was a Delaware limited liability company that passed through income and losses to its members. As a result, the Company was not subject to any U.S. federal or state income taxes as the related tax consequences were reported by the individual members. Effective upon the completion of the LLC Conversion, the Company accounts for income taxes using the asset and liability method, which requires the recognition of deferred tax assets and liabilities for the expected future tax consequences of events that have been recognized in its financial statements or tax returns. In addition, deferred tax assets are recorded for the future benefit of utilizing net operating losses and research and development credit carry forwards. Valuation allowances are provided when necessary to reduce deferred tax assets to the amount expected to be realized. Accordingly, the Company assessed the need for a valuation allowance based on the ASC 740 more-likely-than-not realization threshold criterion. Consideration was given to all positive and negative evidence related to the realization of the deferred tax assets. This assessment considered, among other matters, the nature, frequency and severity of recent and cumulative losses, forecasts of future profitability, the duration of statutory carryforward periods, experience with operating loss and tax credit carryforwards expiring, and tax planning alternatives. Significant judgment was required to determine whether a valuation allowance was necessary and the amount of such valuation allowance, if appropriate. In the event that the Company changes its determination as to the amount of deferred tax assets that can be realized, the Company will adjust its valuation allowance with a corresponding impact to the provision for income taxes in the period in which such determination is made. The Company applies the authoritative accounting guidance prescribing a threshold and measurement attribute for the financial recognition and measurement of a tax position taken or expected to be taken in a tax return. The Company recognizes liabilities for uncertain tax positions based on a two-step process. The first step is to evaluate the tax position for recognition by determining if the weight of available evidence indicates that it is more-likely-than-not that the position will be sustained on audit, including resolution of related appeals or litigation processes, if any. The second step requires the Company to estimate and measure the tax liability as the largest amount that is more-likely-than-not to be realized upon ultimate settlement. The Company also accounts for any related interest and penalty charges as a component of income taxes. Comprehensive Income (Loss) Comprehensive income (loss) is defined as a change in equity of a business enterprise during a period, resulting from transactions from non-owner sources. Comprehensive income (loss) is comprised of all components of net income (loss) and all components of other comprehensive income (loss) within stockholders’ equity. The Company’s other comprehensive income (loss) includes unrealized gains and losses from its available-for-sale securities that are not considered other-than-temporarily impaired, net of taxes. Earnings Per Share Basic net income (loss) per share attributable to common stockholders is calculated by dividing the net income (loss) attributable to common stock holders by the weighted-average number of common shares outstanding for the period. Diluted net income per share attributable to common stockholders is computed by giving effect to all potential dilutive common stock outstanding during the period, including options, restricted stock units, or RSUs, and ESPP purchase rights. The computation of diluted net income does not assume conversion or exercise of potentially dilutive securities that would have an anti-dilutive effect on earnings. The dilutive effect of outstanding options is computed using the treasury stock method. In periods when the Company has incurred a net loss, potential dilutive common securities outstanding have been excluded from the calculation of diluted net loss per share attributable to common stockholders as their effect is antidilutive. Prior to the conversion of its redeemable convertible Series A preferred stock (the “Series A preferred stock”) to common stock, effective June 17, 2013, the Company applied the two-class method for calculating and presenting earnings per share as the Series A preferred stock was considered a participating security due to the rights of cumulative preferred return. Participating securities are defined as securities that participate in dividends with common units according to a pre-determined formula or a contractual obligation to share in the income of the entity. Under the two-class method, net income (loss) is allocated between common stock and other participating securities based on their participating rights. Accordingly, earnings allocated or distributed to the Series A preferred stock as well as the related number of outstanding shares of the Series A preferred stock have been excluded from the computation of basic and diluted net income (loss) per share attributable to common stockholders. Dilutive securities that were subject to the Company’s IPO were excluded from the Company’s diluted net income (loss) per share calculation for the periods before the close of the Company’s IPO in June 2013. Recent Accounting Pronouncements In May 2014, the Financial Accounting Standards Board (the "FASB") issued an Accounting Standards Update related to revenue from contracts with customers, which supersedes the revenue recognition requirements in the current Accounting Standards Codification. This standard is based on the principle that revenue is recognized to depict the transfer of goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. This standard also requires additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments and changes in judgments and assets recognized from costs incurred to obtain or fulfill a contract. In August 2015 the FASB voted to defer the effective date by one year. The effective date of this standard will be the first quarter of fiscal 2019 using one of two retrospective application methods. The Company is currently evaluating the potential impact, if any, of this accounting standard update on its future consolidated financial statements. In June 2014, the FASB issued an authoritative standard related to stock compensation Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period. This standard requires that a performance target that affects vesting and that could be achieved after the requisite service period be treated as a performance condition. A company should apply the existing guidance as it relates to awards with performance conditions that affect vesting to account for such awards. Compensation cost should be recognized in the period in which it becomes probable that the performance target will be achieved and should represent the compensation cost attributable to the periods for which the requisite service has already been rendered. The amendments in this update are effective for annual periods and interim periods within annual periods beginning after December 15, 2015 and early adoption is permitted. The adoption of this guidance is not currently expected to have a material impact on the Company’s consolidated financial statements. In August 2014, the FASB issued an authoritative standard related to the disclosure of Uncertainties about an Entity’s Ability to Continue as a Going Concern, to provide guidance on management’s responsibility in evaluating whether there is a substantial doubt about a company’s ability to continue as a going concern and to provide related footnote disclosures. The effective date of this standard will be for annual periods ending after December 15, 2016 with early adoption permitted. The adoption of this guidance is not currently expected to have a material impact on the Company’s consolidated financial statements. In June 2015, the FASB issued an authoritative standard related to Technical Corrections and Improvements. The standard covers a wide range of topics including guidance clarification and reference corrections, simplification and minor improvements. Transition guidance varies based on the specific topic included in this standard. The topics that require transition guidance are effective for all entities for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015. Early adoption is permitted. All other topics were effective upon the issuance of this standard. The Company is currently evaluating the impact, if any, of this guidance on the Company’s consolidated financial statements. In July 2015, the FASB issued an authoritative standard related to disclosure of inventory, to provide guidance on management’s responsibility to measure inventory at the lower of cost and net realizable value. The effective date of this standard will be for annual periods ending after December 15, 2016 with early adoption permitted. The Company is currently evaluating the impact, if any, of this guidance on the Company’s consolidated financial statements. In November 2015, the FASB issued an authoritative standard to provide guidance regarding balance sheet classification of deferred taxes. The guidance requires companies to classify all deferred tax assets and liabilities as non-current on the balance sheet instead of separating deferred taxes into current and non-current amounts. This guidance is effective for public business entities for financial statements issued for annual periods beginning after December 15, 2016, and interim periods within those annual periods. The amendments can be applied retrospectively or prospectively with earlier application permitted as of the beginning of an interim or annual reporting period. The Company has chosen to early adopt, on a prospective basis, and as such has recorded all of its deferred tax assets and liabilities as non-current as of December 26, 2015.

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 26, 2015
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements Cash, Cash Equivalent and Investments The components of the Company’s cash, cash equivalents and investments are as follows (in thousands): Fair Value Measured Using December 26, 2015 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Cash and cash equivalents: Money market funds $ 83,852 $ 83,852 $ — $ — Commercial paper 4,497 — 4,497 Total cash equivalents 88,349 83,852 4,497 — Cash 31,863 Total cash and cash equivalents $ 120,212 Short-term investments: Corporate debt securities $ 14,560 $ — $ 14,560 $ — Commercial paper 8,986 — 8,986 — U.S. agency debt securities 29,008 — 29,008 — U.S. government securities 37,447 — 37,447 — Total short-term investments $ 90,001 $ — $ 90,001 $ — Fair Value Measured Using December 27, 2014 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Cash and cash equivalents: Money market funds $ 15,976 $ 15,976 $ — $ — Total cash equivalents 15,976 15,976 — — Cash 22,965 Total cash and cash equivalents $ 38,941 Short-term investments: Corporate debt securities $ 58,707 $ — $ 58,707 $ — U.S. agency debt securities 31,779 — 31,779 — U.S. government securities 19,979 — 19,979 — Total short-term investments $ 110,465 $ — $ 110,465 $ — The Company considers all highly liquid investments with maturity of three months or less at the time of purchase to be cash equivalents. The Company holds money market funds that invest primarily in high-quality short-term money-market instruments, and these funds are not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. The Company presents available-for-sale investments as current assets as they are available for the Company's current operations. Money market funds have been classified as Level 1 because these securities are valued based upon quoted prices in active markets. The Company’s Level 2 assets are priced using quoted market prices for similar instruments or non-binding market prices that are corroborated by observable market data. The Company uses inputs such as actual trade data, benchmark yields, broker/dealer quotes or alternative pricing sources with reasonable levels of price transparency which are obtained from quoted market prices, independent pricing vendors, or other sources, to determine the ultimate fair value of these assets. The Company’s policy is to recognize transfers among Level 1, Level 2 and Level 3 classifications as of the actual date of the events or change in circumstances that caused the transfers. The Company did not have any transfers between Level 1 and Level 2 in the fiscal years ended December 26, 2015 and December 27, 2014. As of December 26, 2015 and December 27, 2014, the Company had no liabilities measured at fair value. Financial instruments measured at amortized costs, gross unrealized gain, gross unrealized loss and fair value by significant investment categories are summarized as follows (in thousands): December 26, 2015 Amortized Costs Gross Unrealized Gains Gross Unrealized Losses Fair Value Cash and cash equivalents: Money market funds $ 83,852 $ — $ — $ 83,852 Commercial paper 4,497 — — 4,497 Cash 31,863 — — 31,863 Total cash and cash equivalents $ 120,212 $ — $ — $ 120,212 Short-term investments: Corporate debt securities $ 14,570 $ — $ (10 ) $ 14,560 Commercial paper 8,986 — — 8,986 U.S. agency debt securities 29,031 — (23 ) 29,008 U.S. government securities 37,461 3 (17 ) 37,447 Total short-term investments $ 90,048 $ 3 $ (50 ) $ 90,001 December 27, 2014 Amortized Costs Gross Unrealized Gains Gross Unrealized Losses Fair Value Cash and cash equivalents: Money market funds $ 15,976 $ — $ — $ 15,976 Cash 22,965 — — 22,965 Total cash and cash equivalents $ 38,941 $ — $ — $ 38,941 Short-term investments: Corporate debt securities $ 58,777 $ 4 $ (74 ) $ 58,707 U.S. agency debt securities 31,800 1 (22 ) 31,779 U.S. government securities 19,982 7 (10 ) 19,979 Total short-term investments $ 110,559 $ 12 $ (106 ) $ 110,465 The Company’s realized gain was immaterial in the twelve months ended December 26, 2015. There were no securities in a material continuous loss position for 12 months or longer as of December 26, 2015 or December 27, 2014. The contractual maturity date of the cash, cash equivalents and short-term investments was as follows (in thousands): As of December 26, 2015 December 27, 2014 Due within one year $ 177,852 $ 90,555 Due between one and five years 498 35,886 Total 178,350 126,441 Cash 31,863 22,965 Total $ 210,213 $ 149,406

Balance Sheet Components

Balance Sheet Components	12 Months Ended
	Dec. 26, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Balance Sheet Components	Balance Sheet Components Inventories Inventories are comprised of the following (in thousands): As of December 26, 2015 December 27, 2014 Raw materials $ 76 $ 433 Finished goods 3,737 6,118 Total inventories, net $ 3,813 $ 6,551 Property and equipment, net Property and equipment, net, are comprised of the following (in thousands): As of December 26, 2015 December 27, 2014 Equipment and machinery $ 14,932 $ 12,189 Furniture and fixtures 308 430 Leasehold improvements 2,248 2,256 Software 1,963 1,824 Total property and equipment 19,451 16,699 Less accumulated depreciation and amortization (10,035 ) (9,312 ) Total property and equipment, net $ 9,416 $ 7,387 Depreciation expense was $4.8 million , $4.3 million and $2.6 million for fiscal 2015 , 2014 and 2013 , respectively. Accrued Liabilities Accrued liabilities are comprised of the following (in thousands): As of December 26, 2015 December 27, 2014 Accrued employee related costs $ 25,392 $ 16,021 Accrued inventory and other purchases 2,452 1,830 Accrued taxes payable 1,918 1,183 Accrued professional services 1,655 761 Other accruals 5,917 3,043 Total accrued liabilities $ 37,334 $ 22,838 Accrued Warranty Accrued Warranty is comprised of (in thousands): Fiscal Year Ended December 26, 2015 December 27, 2014 December 28, 2013 Accrued warranty balance at beginning of period $ 875 $ 686 $ 350 Accrual for warranty during the period 984 949 970 Actual costs incurred (1,052 ) (760 ) (634 ) Accrued warranty balance at end of period $ 807 $ 875 $ 686 As of Warranty accrual reported as: December 26, 2015 December 27, 2014 Current $ 490 $ 484 Non-current 317 391 Total accrued warranty $ 807 $ 875 Deferred Revenue Deferred revenue is comprised of the following (in thousands): As of December 26, 2015 December 27, 2014 Deferred service revenue $ 73,454 $ 51,699 Deferred product revenue $ 8,677 $ 3,806 Total deferred revenue $ 82,131 $ 55,505 Accumulated Other Comprehensive Income (Loss) Accumulated other comprehensive income (loss) consists of unrealized gains and losses from available-for-sale securities. The following summarizes the activity within accumulated other comprehensive income (loss) (in thousands): Accumulated Other Comprehensive Income (Loss) Net Unrealized Gains (loss) Balance as of December 31, 2012 $ — Available-for-sale securities: Unrealized gains, net $ 23 Total other comprehensive income $ 23 Balance as of December 28, 2013 $ 23 Available-for-sale securities: Unrealized losses $ (117 ) Total other comprehensive loss $ (117 ) Balance as of December 27, 2014 $ (94 ) Available-for-sale securities: Unrealized gains, net 47 Total other comprehensive income 47 Balance as of December 26, 2015 $ (47 ) There were no reclassifications out of accumulated other comprehensive income (loss) into the consolidated statements of operations in fiscal 2015 and 2014 .

Related Party Transactions

Related Party Transactions	12 Months Ended
	Dec. 26, 2015
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions Gigamon LLC Members’ Distribution Payable Prior to the LLC Conversion, in accordance with the LLC Agreement, the Company distributed to the holders of Series A preferred units and common units (hereafter referred to as the members) pro rata net income or losses based upon the number of units held by the members. The Series A preferred units allocation was based on an as-converted to common units basis. During fiscal 2015 , 2014 and 2013 , the Company distributed $0.0 million , $0.5 million and $7.0 million , respectively; such distribution amounts included no income taxes for fiscal 2015, 2014 and 2013. The undistributed amount was recorded as Gigamon LLC members’ distribution payable within accrued liabilities in the consolidated balance sheets. As of December 26, 2015 and December 27, 2014 , the members’ distribution payable was zero .

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 26, 2015
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Lease Commitments On July 2, 2013, the Company entered into a sublease agreement to lease 105,664 square feet of office space, located in Santa Clara, California, with a term of 51 months from January 2014 through March 2018, for an aggregate net base rent of $10.7 million . In addition to the monthly base rent, the Company is responsible for payment of certain operating expenses, including utilities and real estate taxes. The Company is using the leased space as its worldwide corporate headquarters. In addition, the Company leases office space for its United Kingdom subsidiary under a non-cancelable operating lease that expires in December 2017. The Company has also entered into lease agreements for additional office space for sales offices in Australia, Brazil, Canada, China, France, Germany, Hong Kong, Italy, India, Japan, Mexico, Russia, Singapore, South Korea, and the United Arab Emirates. The Company recognizes rent expense on a straight-line basis over the lease period. Rent expense related to the Company’s operating leases was approximately $3.2 million , $2.9 million and $1.1 million for fiscal 2015 , 2014 and 2013 , respectively. Future minimum lease payments under non-cancelable operating leases as of December 26, 2015 were as follows (in thousands): Fiscal Year: 2016 3,763 2017 3,360 2018 957 2019 82 Total $ 8,162 Purchase Commitments The Company has agreements with contract manufacturers for the manufacturing of its products. The agreement with its primary contract manufacturer allows the contract manufacturer to procure components on the Company’s behalf based upon a production forecast provided by the Company. The Company may be obligated to purchase component inventory that is non-cancellable. As of December 26, 2015 and December 27, 2014 , the Company’s non-cancellable purchase commitments for such component inventory was $12.0 million and $3.7 million , respectively. Legal Proceedings From time to time, the Company may become involved in legal proceedings arising in the ordinary course of business. The Company is not currently a party to any legal proceedings the outcome of which, if determined adversely to the Company, would individually or in the aggregate be expected to have a material adverse effect on its business, operating results, financial condition or cash flows. Indemnification Obligations Under the indemnification provisions of its standard sales related contracts, the Company agrees to defend its customers against third party claims asserting infringement of certain intellectual property rights, which may include patents, copyrights, trademarks, or trade secrets, and to pay judgments entered on such claims. The Company’s exposure under these indemnification provisions is generally limited to the total amount paid by its customer under the agreement. However, certain agreements include indemnification provisions that could potentially expose the Company to losses in excess of the amount received under the agreement. The Company has not incurred any costs as a result of such indemnifications and has not accrued any liabilities related to such obligations in its consolidated financial statements. In addition, the Company indemnifies its officers, directors, and certain key employees while they are serving in good faith in the company capacities. To date, there have been no claims under any indemnification provisions.

Performance Unit Plan

Performance Unit Plan	12 Months Ended
	Dec. 26, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Performance Unit Plan	Performance Unit Plan In fiscal 2009, the Company adopted the 2009 Performance Unit Plan (the “2009 Plan”). The 2009 Plan was not an equity plan and was intended to provide an incentive payment to employees, consultants and Board members by providing payment based on the appreciation in value of the Company at the time of a change in control event, such as a business acquisition, merger or an IPO (each performance unit a “PUP”). PUPs did not constitute ownership units or interests of the Company. The distribution amount was defined as the difference between the redemption value of the units received at the time of the change of control and the base value of the PUP, which was $0.15 as determined by the Board at each award date. While the distributable amount may be satisfied in either cash or stock at the time of a change in control, the Company elected to make such distribution in cash. Under existing accounting guidance, the compensation expense associated with the 2009 Plan is not required to be reflected in the consolidated financial statements until Change of Control is deemed probable. Accordingly, the Company had not recorded any liabilities or compensation expense associated with the PUPs in its consolidated financial statements until the period in which a change of control occurred. Accordingly, the Company recorded compensation and related payroll tax expenses of $20.4 million in its consolidated financial statements in fiscal 2013 , for the 1,057,772 PUPs vested upon the completion of the IPO on June 17, 2013. The Company did not record any related compensation expense in fiscal 2014 and 2015 . The 2009 Plan was terminated in June 2013, in connection with the completion of the IPO. The following table summarizes the Company’s PUP activity: PUPS Outstanding PUPS Available for Grant Number of PUPS Weighted- Average Base Price Balances — December 31, 2012 218,160 1,404,812 0.15 Settled — (1,057,772 ) 0.15 Cancelled 347,040 (347,040 ) 0.15 Termination of the Plan (565,200 ) — 0.15 Balances — December 28, 2013 — —

Preferred Stock and Stockholder

Preferred Stock and Stockholders' Equity	12 Months Ended
	Dec. 26, 2015
Equity [Abstract]
Preferred Stock and Stockholders' Equity	Preferred Stock and Stockholders’ Equity LLC Conversion On May 31, 2013, the Company converted from a Delaware limited liability company into a Delaware corporation and changed the Company’s name from Gigamon LLC to Gigamon Inc. Effective May 31, 2013, all of the Company’s outstanding common units and preferred units were converted into shares of common stock and preferred stock. Immediately following the LLC Conversion, certain entities affiliated with Highland Capital Partners that held the Company’s Series A preferred stock were merged with and into the Company, and the entities affiliated with Highland Capital Partners that merged with and into the Company received preferred stock in exchange for their equity interests. Further, in connection with the LLC Conversion, Gigamon Systems LLC, the holder of all of the Company’s outstanding common units prior to the LLC Conversion, exchanged all of the interests that it held in the Company for 16,851,635 shares of common stock of Gigamon Inc. In addition, all outstanding options to purchase shares in Gigamon Systems LLC were substituted for fully vested options to purchase 448,349 shares of the Company’s common stock, at a weighted average exercise price of $0.02 per share, for which the Company recognized related stock-based compensation expense of $8.5 million in fiscal 2013 . Additionally, upon completion of the conversion, the Company recorded a net adjustment to deferred income tax assets of $14.8 million and reclassified $24.0 million from accumulated deficit to additional paid-in capital. Initial Public Offering and Conversion of Preferred Stock On June 17, 2013, the Company completed its initial public offering (“IPO”), in which 7,762,500 shares of its common stock were sold at a public offering price of $19.00 per share. The Company sold 5,512,500 shares of common stock, inclusive of 1,012,500 shares of common stock sold upon the exercise in full of the overallotment option by the underwriters. In addition, certain selling stockholders sold 2,250,000 shares of common stock at a public offering price of $19.00 per share. In connection with its IPO, all of the Company’s then-outstanding redeemable convertible preferred stock was converted into 8.1 million shares of common stock. Follow-On Public Offering On October 28, 2013, the Company completed its follow-on public offering, in which 5,100,000 shares of its common stock were sold at a public offering price of $38.50 per share. The Company sold 300,000 shares of common stock and the Company’s selling stockholders sold 4,800,000 shares of common stock, which included 293,718 shares of common stock issued upon the exercise of options by certain selling stockholders, with an aggregate exercise price of $1.3 million , at a public offering price of $38.50 per share. Redeemable Convertible Series A Preferred Units The LLC Agreement authorized the Company to issue 8,109,848 Series A preferred units (“Series A”) at no par value. Upon the LLC Conversion, all of the then-outstanding Series A were converted into shares of Series A preferred stock. Furthermore, in connection with the closing of the Company’s IPO, all of the Company’s then-outstanding shares of Series A preferred stock were converted into shares of common stock on June 17, 2013 (the “Series A Conversion”). As of December 26, 2015 and December 27, 2014 , the Company had zero Series A units outstanding. The rights, privileges and restrictions of Series A units as set forth in the LLC Agreement as in effect prior to the LLC Conversion are summarized as follows: Voting Each unit of Series A had voting rights equal to an equivalent number of common units into which it was convertible and voted together as one class with the common units. Liquidation Upon a liquidation or a deemed liquidation event, the Company was obligated to distribute the net proceeds or assets available for distribution, whether in cash or in other property, to the holders of Series A and common units as follows: • First, to the holders of Series A on a pari passu basis, and • Next, to the holders of common units, pro rata in proportion to the number of common units held by such holders. A merger or consolidation of the Company into another entity in which the members of the Company would own less than 50% of the voting stock/units of the surviving company or the sale or transfer of substantially all of the assets would be deemed a liquidation of the Company. Conversion Conversion was either at the option of the holder or was automatic upon the written consent of the requisite Series A Preferred Holders. “Requisite Series A Preferred Holders” was defined as holders of a majority of the Series A units then issued and outstanding, voting as a separate class. Each Series A unit was convertible into a common unit by dividing $2.81 by the conversion price in effect. The initial conversion price of $2.81 was subject to adjustments for subdivisions or combinations of common units, reclassification, exchange and substitution and dilutive issuances. As of December 31, 2012 , the conversion price in effect was the same as the issuance price. In connection with the LLC Conversion, the Series A units were converted into shares of Series A preferred stock at a ratio of 1 -to- 1 . Redemption The holders of Series A units were entitled to elect to require the Company to purchase all of the outstanding Series A, after January 20, 2015, at $2.81 per unit plus accrued preferred return at 8% per annum, payable in three equal annual installments. Prior to the redemption upon the completion of the IPO, the Company was accreting to the January 20, 2015 redemption value of $33.5 million . For fiscal 2013 the company recorded $1.0 million for the accretion of the Series A units to their redemption value using the effective interest method. The Company initially recorded the Series A units at their issuance price net of issuance costs, which represented the carrying value. The difference between the initial carrying value of Series A units and their total redemption value was accreted from the issuance date through the first redemption date, January 20, 2015, using the effective interest rate method. The Company recorded no accretion of issuance costs of for fiscal 2015 and 2014 . The Company recorded accretion of issuance costs of $0.1 million for fiscal 2013 . Preferred Stock The Company has authorized 20,000,000 shares of undesignated preferred stock, $0.0001 par value per share. As of December 26, 2015 and December 27, 2014 , the Company had no shares of preferred stock issued or outstanding. Common Units Prior to the LLC Conversion, the Company had 33,333,333 common units authorized. Each holder of common units was entitled to one vote for each common unit held. Upon the LLC Conversion, all of the then-outstanding common units were converted into shares of common stock. As of December 26, 2015 and December 27, 2014 , the Company had no common units outstanding. Common Stock The Company has authorized 1,000,000,000 shares of common stock, $0.0001 par value per share. Each holder of common stock is entitled to one vote for each share of common stock held. Cumulative voting for the election of directors is not provided in the Company’s amended and restated certificate of incorporation. The Company’s common stock is not entitled to preemptive rights, and is not subject to conversion, redemption or sinking fund provisions. Subject to preferences that may apply to any shares of preferred stock outstanding at the time, the holders of common stock are entitled to receive dividends out of funds legally available if the Board, in its discretion, determines to issue dividends and then only at the times and in the amounts that the Board may determine. As of December 26, 2015 and December 27, 2014 , the Company had 34,323,457 and 32,641,500 shares of common stock issued and outstanding, respectively. Treasury Stock As of December 26, 2015 and December 27, 2014 , the Company had 8,109,848 shares of treasury stock outstanding, with a carrying value of $12.5 million , or $1.53 per share, within stockholders’ equity on its consolidated balance sheet. The treasury stock was repurchased in fiscal 2010 pursuant to a purchase and redemption agreement. Equity Award Plans Unit Option Plan In March 2012, the Company adopted the 2012 Unit Option Plan (the “Option Plan”). The Option Plan authorized the Company to grant options and RSUs, up to a maximum of 3,300,505 shares, to employees, members and consultants of the Company. The Option Plan was terminated in connection with the Company’s IPO but will continue to govern the terms and conditions of outstanding awards granted thereunder. Prior to its termination, the Option Plan authorized the Company to grant options and RSUs up to a maximum of 4,967,172 units to employees, directors and consultants of the Company. The following table summarizes the activity under the Option Plan prior to its termination (in shares): Number of shares Shares available for future grant at December 31, 2012 732,267 Additional authorization 1,666,667 Options granted (1,426,849 ) RSUs granted (507,264 ) Options cancelled 64,653 RSUs cancelled 3,234 Transferred to 2013 Equity Incentive Plan upon termination (532,708 ) Shares available for future grant at December 28, 2013 — Under the Option Plan, stock options granted to new hires are generally subject to a four -year vesting period whereby options become 25% vested on the first anniversary from the grant date and then ratably monthly thereafter through the end of the vesting period. Vested options may be exercised up to ten years from the vesting commencement date, as defined in the Option Plan. Vested but unexercised options, under the Option Plan, expire 30 days after termination of employment with the Company. Prior to the IPO, vesting of certain options under the Option Plan was also subject to the completion of the IPO (the “IPO Stock Options”). 2013 Equity Incentive Plan In May 2013, the Company adopted the 2013 Equity Incentive Plan (the “2013 Equity Plan”). All authorized but unissued shares of the Company’s Option Plan were added to the 2013 Equity Plan’s authorized pool in June 2013. The Company is authorized to issue up to a maximum of 2,929,481 shares of common stock for future issuance, plus up to an additional 4,967,172 shares upon termination of awards under the Option Plan. In addition, the 2013 Equity Plan is subject to increase annually on the first day of each of the Company’s fiscal years beginning with fiscal 2014, by an amount equal to the least of (i) 1,464,740 shares, (ii) 5% of the outstanding shares of common stock as of the last day of the immediately preceding fiscal year, or (iii) such other amount as determined by the Board. Vested but unexercised options, under the 2013 Equity Plan, expire three months after termination of service with the Company. As of December 26, 2015, outstanding awards under the 2013 Equity Plan and the Option Plan covered 2,825,746 shares and 1,127,757 shares of the Company's common stock, respectively. The 2013 Equity Plan permits the granting of stock options, stock appreciation rights, restricted stock, RSUs, performance units and performance shares to employees, directors and consultants of the Company. Employee Stock Purchase Plan In conjunction with the completion of its IPO in June 2013, the Company adopted the 2013 Employee Stock Purchase Plan (the “ESPP”). A maximum of 439,422 shares were initially authorized for future issuance and the number of authorized shares under the ESPP is subject to increase on an annual basis. In the twelve months ended December 26, 2015 and December 27, 2014, the Board authorized an additional 439,422 shares of common stock for future issuance under the ESPP. Eligible employees can purchase shares of the Company’s common stock at a discount through payroll deductions of up to 15% of their eligible compensation, subject to plan limitations. Employees are able to purchase shares at 85% of the lower of the fair market value of the Company’s common stock (i) at the date of commencement of the offering period or (ii) at the last day of the purchase period. The ESPP provides for a 24 -month offering period comprised of four purchase periods of approximately six months . The offering periods are scheduled to start on the first trading day on or after February 15 and August 15 of each year, except for the first offering period, which commenced on the first trading day upon the completion of the Company’s IPO, or June 12, 2013, and ended on August 17, 2015. In fiscal 2015 , 2014, and 2013, the Company recorded stock-based compensation expense of $2.7 million , $4.2 million and $4.7 million , respectively for its ESPP. During fiscal 2015 there were two purchase periods that resulted in the issuance of 527,588 shares of common stock at a weighted average purchase price of 9.77 per share. Stock Options Stock options granted under the 2013 Equity Plan and formerly under the 2012 Plan (together, the “Option Plans”), are generally subject to a four -year vesting period whereby stock options become 25% vested on the first anniversary of the grant date and then ratably monthly thereafter through the end of the vesting period. Vested stock options may be exercised up to ten years from the vesting commencement date. Under the 2012 Plan, vested but unexercised stock options expire 30 days after termination of service with the Company. Under the 2013 Equity Plan, vested but unexercised stock options expire three months after termination of service with the Company. In fiscal 2012 the Company granted 66,663 shares subject to performance-based options. These options vest based upon the achievement of sales goals for each individual grantee. As of December 26, 2015 there were 2,611 performance based common stock awards outstanding, all of which were unvested. As of December 27, 2014 there were 20,135 performance based common stock awards outstanding, of which 9,830 were unvested. The Company recognized approximately $51,000 , $40,000 , and $134,400 in stock-based compensation expense related to performance-based options during fiscal 2015 , 2014 , and 2013, respectively. The Company did not issue any performance-based options in fiscal 2015 or 2014. In fiscal 2013 , the Company granted 448,349 shares subject to fully-vested options to certain employees, with an average exercise price of $0.02 per share, as substitute options to purchase our common stock in connection with the LLC Conversion. Stock-based compensation expense recognized in fiscal 2013 in connection with these fully vested options was $8.5 million . The Company did not issue any fully-vested options in fiscal 2015 or 2014. In fiscal 2012 , the Company granted a total of 1,143,413 shares subject to the IPO Stock Options, for which the Company recorded $3.8 million of stock-based compensation expense in fiscal 2013 upon the completion of its IPO in June 2013. The following table summarizes the stock option activity related to shares of common stock under the Company’s Option Plans: Number of Stock Options Outstanding Weighted- Average Exercise Price Weighted- Average Remaining Contractual Life (Years) Aggregate Intrinsic Value (in thousands) Balance — December 31, 2012 2,402,398 $ 7.92 9.40 $ 12,527 Options granted 1,604,847 $ 11.34 Options exercised (344,592 ) $ 4.99 Options cancelled (295,016 ) $ 8.85 Balance — December 28, 2013 3,367,637 $ 9.77 8.78 $ 62,725 Options granted 646,444 $ 20.21 Options exercised (790,147 ) $ 6.73 Options cancelled (843,966 ) $ 11.75 Balance — December 27, 2014 2,379,968 $ 12.91 7.50 $ 14,368 Options granted 408,000 $ 21.44 Options exercised (523,398 ) $ 8.42 Options cancelled (93,850 ) $ 9.76 Balance — December 26, 2015 2,170,720 $ 15.73 7.14 $ 24,910 Vested and expected to vest — December 28, 2013 3,216,818 $ 9.68 8.64 $ 60,034 Exercisable — December 28, 2013 972,268 $ 6.34 8.65 $ 21,344 Vested and expected to vest — December 27, 2014 2,230,425 $ 12.71 8.17 $ 13,754 Exercisable — December 27, 2014 936,061 $ 9.71 7.85 $ 7,643 Vested and expected to vest — December 26, 2015 2,066,613 $ 15.55 7.14 $ 24,088 Exercisable — December 26, 2015 1,114,119 $ 13.23 7.20 $ 15,536 Aggregate intrinsic value represents the difference between the exercise price of the awards and the Company’s fair value per share of $26.82 , $17.47 and $28.29 as of December 26, 2015 , December 27, 2014 , and December 28, 2013, respectively, for the total number of underlying options. During fiscal 2014, the Company accelerated the vesting of 31,211 shares of common stock pursuant to outstanding stock options and 9,347 RSUs, of certain employees, pursuant to the terms of their severance agreements. This accelerated vesting resulted in a net expense reversal of $0.4 million during the fiscal year since the fair value of the accelerated options and RSUs on the date of modification was lower than the previously recognized stock-based compensation expense. During fiscal 2014, the Company entered into a consulting agreement with a departing executive. Pursuant to the agreement the executive continued to vest stock options and RSU’s as a consultant until the termination of the agreement. The terms of the consulting agreement resulted in a net expense reversal of $0.3 million since the total compensation cost previously recognized exceeded the fair market value of the stock options and RSU’s expected to vest as a result of the consulting agreement. During fiscal 2014, the Company modified certain stock option grants covering 10,666 shares of common stock to restrict these options to cash settlement upon future exercises, for which these stock options are marked-to-market as of each balance sheet date until their settlement dates. Stock-based compensation recognized in connection with these modified stock options was immaterial in fiscal 2014. Additional information regarding the Company’s outstanding stock options and vested and exercisable stock options is summarized below: As of December 26, 2015 Options Outstanding Options Vested and Exercisable Exercise Prices Number of Stock Options Outstanding Weighted- Average Remaining Contractual Life (Years) Weighted- Average Exercise Price per Share Shares Subject to Stock Options Weighted- Average Exercise Price per Share $0.00 - $10.85 508,423 6.9 $ 6.32 355,089 $ 5.31 $11.02 - $13.11 523,706 7.1 $ 12.26 353,950 $ 12.33 $14.70 - $19.00 477,619 7.8 $ 17.05 284,017 $ 17.07 $21.44 - $29.36 446,000 6.3 $ 22.11 19,791 $ 29.36 $29.47 - $30.51 214,972 8.1 $ 30.27 101,272 $ 30.23 2,170,720 7.1 $ 15.73 1,114,119 $ 13.23 Restricted Stock Unit Activity RSUs generally vest over a period of one to four years. RSUs vest on the vesting dates determined by the Company. The vesting is subject to the employee’s continuing service with the Company over that period. Until vested, RSUs do not have the voting or dividend participation rights of the Company’s common stock and the shares of the Company’s common stock underlying the awards are not considered issued and outstanding. The cost of RSUs is determined using the fair value of the Company’s common stock on the date of the grant. Prior to our IPO, vesting of RSUs was subject to the occurrence of a liquidity event, and in certain instances additional vesting criteria. The liquidity event was defined as the earliest of (i) the closing of a sale event of the Company, or (ii) six months following the IPO of the Company’s common stock. The following table summarizes the RSU activity under the Company’s Option Plans: Number of RSUs Outstanding Weighted- Average Grant Date Fair Value Weighted- Average Remaining Contractual Life (Years) Aggregate Intrinsic Value (in thousands) Balance - December 31, 2012 149,841 $ 11.12 1.98 1,965 RSUs granted 764,509 $ 22.13 RSUs vested (50,849 ) $ 11.06 RSUs canceled (22,552 ) $ 16.16 Balance - December 28, 2013 840,949 $ 21.00 1.40 23,790 RSUs granted 1,668,228 $ 19.58 RSUs vested (397,239 ) $ 21.18 RSUs canceled (378,713 ) $ 24.64 Balance - December 27, 2014 1,733,225 $ 18.79 1.27 $ 30,245 RSUs granted 1,364,465 RSUs vested (1,010,609 ) RSUs canceled (307,742 ) Balance - December 26,2015 1,779,339 $ 22.64 1.53 $ 47,722 Vested and expected to vest — December 28, 2013 783,633 $ 20.89 1.35 $ 22,169 Vested and expected to vest — December 27, 2014 1,521,264 $ 18.66 1.18 $ 26,580 Vested and expected to vest — December 26, 2015 1,510,440 $ 22.53 1.43 $ 40,510 Aggregate intrinsic value for RSUs represents the Company’s fair market value per share of $26.82 , $17.47 , and $28.29 as of December 26, 2015 , December 27, 2014 , and December 28, 2013, respectively, for the total number of underlying RSUs. Stock-Based Compensation Expense The fair value of stock options is estimated on the grant date using the Black-Scholes option-pricing model. It is based on the “simplified method” for developing the estimate of the expected life of a “plain vanilla” stock option. Under this approach, the expected term is presumed to be the midpoint between the average vesting date and the end of the contractual term of the option. The risk-free interest rate for the period covering the expected life of the option is based on the U.S. Treasury yield curve in effect at the time of grant. The expected volatility was determined based on historical volatility of the common stock of publicly traded comparable companies and the expected life of the options since the Company has not had sufficient public trading history of its common stock. The dividend yield assumption is based on the Company’s historical dividend payouts. The Company uses the graded vesting method for expense attribution. Prior to the IPO, determining the market value of the Company’s common stock required complex and subjective judgment and estimates. There was inherent uncertainty in making these judgments and estimates. The absence of an active market for the Company’s common units or common stock prior to the IPO required the Board to estimate the fair value of its common stock for purposes of setting the exercise price of the options and estimating the fair value of common stock at each meeting at which options were granted based on factors such as the valuations of comparable companies, the status of the Company’s development and sales efforts, revenue growth and additional objective and subjective factors relating to the Company’s business. The Company performed its analysis in accordance with applicable elements of the practice aid issued by the American Institute of Certified Public Accountants entitled Valuation of Privately Held Company Equity Securities Issued as Compensation. The fair value of the option awards and ESPP purchase rights granted and the assumptions used in the Black-Scholes option pricing model are summarized as follows: Fiscal Year Ended December 26, December 27, December 28, Stock option awards: Expected term (in years) 4.6 5.27 - 6.08 5.00 - 6.08 Risk-free interest rate 1.6% 1.69% - 1.90% 0.89% - 1.84% Expected volatility 56.04% 58.9% - 61.9% 62.1% - 65.3% Expected dividend rate —% —% —% Grant date fair value per award $10.11 $5.94 - $17.67 $9.44 - $23.29 ESPP purchase right: Expected term (in years) 0.5 - 2.0 0.5 - 2.0 0.68 - 2.18 Risk-free interest rate 0.07% - 0.72% 0.05% - 0.42% 0.08% - 0.20% Expected volatility 37.6% - 59.9% 53.1% - 63.1% 53.6% - 63.1% Expected dividend rate —% —% —% Grant date fair value per share $5.48 - $12.64 $3.48 - $13.06 $12.11 - $15.68 The cost of RSUs is determined using the fair value of the Company’s common stock on the date of the grant. In fiscal 2015 , the Company granted 1,364,465 RSUs with a grant date fair value per share ranging from $16.31 to $33.95 . In fiscal 2014 , the Company granted 1,668,228 RSUs with a grant date fair value per share ranging from $10.75 to $34.26 . In fiscal 2013, the Company granted 764,509 RSUs with a grant date fair value per share ranging from $15.57 to $38.33 . As of December 26, 2015 , unrecognized compensation expense related to stock options, RSUs and ESPP purchase rights, net of estimated forfeitures, was $3.3 million , $18.2 million , and $1.4 million , respectively, with a weighted-average remaining amortization period of 1.0 year , 1.5 years and 0.9 years , respectively. As of December 27, 2014 , unrecognized compensation expense related to unvested stock options, RSUs and ESPP purchase rights net of estimated forfeitures, was $5.1 million , $16.2 million , and $3.5 million , respectively with a weighted-average remaining amortization period of 1.1 years , 1.3 years , and 0.7 years , respectively. As of December 28, 2013 unrecognized compensation expense related to unvested stock options, RSUs and ESPP purchase rights net of estimated forfeitures, was $10.3 million , $10.9 million , and $5.1 million , respectively with a weighted-average remaining amortization period of 1.4 years , 1.4 years , and 0.9 years , respectively. As of December 26, 2015 and December 27, 2014 there was $0.1 million and $0.2 million capitalized stock-based compensation expense, respectively within the Company's inventory balance. The following table summarizes the stock-based compensation expense recorded in the Company’s consolidated statement of operations (in thousands): Fiscal Year Ended December 26, December 27, December 28, Cost of revenue $ 1,872 $ 1,679 $ 3,496 Research and development 9,126 8,102 11,467 Sales and marketing 9,466 8,212 11,034 General and administrative 9,304 6,665 6,546 Total stock-based compensation expense $ 29,768 $ 24,658 $ 32,543 Common Stock Reserved for Future Issuance The Company had the following shares of common stock reserved for future issuance (in shares): As of December 26, 2015 December 27, 2014 Option Plan: Common stock subject to options outstanding 1,068,808 1,640,500 RSUs outstanding 58,949 197,448 Shares available for future grants — — 2013 Equity Plan: Common stock subject to options outstanding 1,105,356 745,912 RSUs outstanding 1,720,390 1,533,777 Shares available for future grants 3,753,018 3,656,706 ESPP 332,351 420,517 Common stock reserved for future issuances 8,038,872 8,194,860

Defined Contribution Plans

Defined Contribution Plans	12 Months Ended
	Dec. 26, 2015
Postemployment Benefits [Abstract]
Defined Contribution Plans	Defined Contribution Plans The Company sponsors a 401(k) defined contribution plan providing a matching contribution of 50% of each participant’s contribution, up to the lesser of 3% of the participant’s annual compensation or $7,950 for fiscal 2015 , $7,650 for fiscal 2014 , and $7,500 for fiscal 2013 . The Company’s contributions to the 401(k) defined contribution plan were $1.8 million , $2.0 million and $1.6 million for fiscal 2015 , 2014 and 2013 , respectively.

Income Tax

Income Tax	12 Months Ended
	Dec. 26, 2015
Income Tax Disclosure [Abstract]
Income Tax	Income Tax Income (loss) before income tax (provision) benefit consisted of the following (in thousands): Fiscal Year Ended December 26, 2015 December 27, 2014 December 28, 2013 United States $ 10,326 $ (20,682 ) $ (31,024 ) Foreign 1,538 1,026 824 Total income (loss) before income tax (provision) benefit $ 11,864 $ (19,656 ) $ (30,200 ) The income tax (provision) benefit consisted of the following (in thousands): Fiscal Year Ended December 26, 2015 December 27, 2014 December 28, 2013 Federal: Current $ (4,162 ) $ — — Deferred — (19,504 ) 19,504 State: Current (926 ) (24 ) (10 ) Deferred — (1,373 ) 1,373 Foreign: Current (661 ) (285 ) (216 ) Deferred 71 52 12 Total income tax (provision) benefit $ (5,678 ) $ (21,134 ) $ 20,663 The items accounting for the difference between income taxes computed at the federal statutory income tax rate and the income tax (provision) benefit consisted of the following (dollars in thousands): Fiscal Year Ended December 26, 2015 December 27, 2014 December 28, 2013 Federal statutory rate 35 % 35 % 35 % Effect of: Tax (provision) benefit at federal statutory rate $ (4,153 ) $ 6,881 $ 10,570 State tax (provision) benefit, net of federal tax (provision) benefit (405 ) 515 376 ESPP (723 ) (1,106 ) (1,760 ) Other permanent items (305 ) (215 ) (281 ) Impact of foreign operations (8 ) 132 37 Tax credits 3,205 2,106 240 LLC income flow-through — — (3,319 ) Recognition of deferred tax assets — — 14,800 Change in valuation allowance (3,289 ) (29,447 ) — Total income tax (provision) benefit $ (5,678 ) $ (21,134 ) 20,663 The Company recognizes interest and penalties related to uncertain tax positions as part of the income tax provision. To date, no such interest and penalties have been accrued. The components of the Company’s deferred tax assets and liabilities are as follows (in thousands): As of December 26, 2015 December 27, 2014 Deferred tax assets: Stock-based compensation $ 12,895 $ 10,672 Fixed assets 3,938 4,272 Net operating loss — 432 Accruals and reserves 6,750 4,761 Deferred revenue 4,895 3,896 Inventory reserve 971 1,231 Credits 3,825 2,651 Gross deferred tax assets 33,274 27,915 Valuation allowance (33,139 ) (27,851 ) Total deferred tax assets 135 64 Deferred tax liabilities — — Total $ 135 $ 64 The provision for income taxes for the year ended December 26, 2015, was primarily related to taxable income in the United States, with additional taxes assessed by foreign jurisdictions. As of December 26, 2015 the Company assessed that it is more-likely-than-not that it will not realize its federal and state deferred tax assets based on the absence of sufficient positive objective evidence that it would generate sufficient taxable income in its United States tax jurisdiction to realize the deferred tax assets. The Company intends to continue maintaining a full valuation allowance on its deferred tax assets until there is sufficient evidence to support the reversal of all or some portion of these allowances. If the Company continues to maintain profitability, there is a reasonable possibility that, within the next year, sufficient positive evidence may become available to reach a conclusion that a significant portion, or all, of the valuation allowance will no longer be needed. As such, the Company may release a significant portion, or all, of its valuation allowance against its deferred tax assets within the next 12 months. This release would result in the recognition of certain deferred tax assets and a decrease to income tax provision for the period such release is recorded. The following table presents the activity in the valuation allowance: Fiscal Year Ended December 26, 2015 December 27, 2014 December 28, 2013 Balance at the beginning of period $ 27,851 $ — $ — Additions 5,288 27,851 — Balance at End of Period $ 33,139 $ 27,851 $ — As of December 26, 2015 , the Company had federal and state net operating loss carryforwards of approximately $6.6 million and $1.1 million , respectively, available to reduce any future taxable income. If not utilized, the federal and state net operating loss carryforwards will expire between fiscal 2033 and 2035, while the California credit will carry forward indefinitely. The Company also has federal and state research and development tax credit carryforwards of approximately $1.1 million and $4.1 million , respectively. The federal credit will start to expire between fiscal 2033 and 2035 while the state credit will carry forward indefinitely. Utilization of the net operating loss carryforwards and credits may be subject to a substantial annual limitation due to the ownership change limitations provided by the Internal Revenue Code of 1986, as amended, and similar state provisions. The annual limitation may result in the expiration of net operating losses and credits before utilization. The Company uses the with-and-without approach described in guidance which has been incorporated into ASC 740, Income Taxes, to determine the recognition and measurement of excess tax benefits. Accordingly, the Company has elected to recognize excess income tax benefits from share-based awards in additional paid-in capital only if an incremental income tax benefit would be realized after considering all other tax attributes presently available to the Company. As of December 26, 2015 , the amount of excess tax benefits from stock options included in federal and state net operating losses was $6.6 million and $1.1 million , respectively. The impact of this excess tax benefit is recognized as additional paid-in capital when it reduces taxes payable. In addition, the Company has elected to account for the indirect effects of share-based awards on other tax attributes, such as the research and alternative minimum tax credits, through the consolidated statement of operations. Uncertain Income Tax Positions The Company has adopted ASC 740-10 "Accounting for Uncertainty in Income Taxes (formerly FIN 48). ASC 740-10 prescribes a recognition threshold and measurement attribute for the financial statement recognition and measurement of uncertain tax positions taken or expected to be taken in the Company's income tax return, and also provides guidance on derecognition, classification, interest and penalties, accounting in interim periods, disclosure, and transition. As of December 26, 2015 and December 27, 2014 , the Company had $3.2 million and $2.3 million of unrecognized tax benefits, respectively which represented an increase in unrecognized tax benefits by $1.0 million during 2015. If recognized, all of these unrecognized tax benefits (net of federal benefit) would be recorded as a reduction of future income tax provision for the years ending December 26, 2015 and December 27, 2014 , respectively. A reconciliation of the beginning and ending amount of the unrecognized income tax benefits during the tax periods ended December 26, 2015 and December 27, 2014 are as follows (in thousands): Fiscal Year Ended December 26, 2015 December 27, 2014 December 28, 2013 Unrecognized tax benefits at the beginning of the period $ 2,258 $ 186 $ — Additions for tax positions related to the current year 1,424 1,824 186 Additions for tax positions related to the prior year 112 248 — Reductions for tax positions related to the prior year (547 ) — — Unrecognized tax benefits at the end of the period $ 3,247 $ 2,258 $ 186 The Company does not anticipate a material change in unrecognized tax benefits within the next twelve months. The Company's policy is to account for interest and penalties related to income tax expense as income tax expense. As of December 26, 2015 and December 27, 2014, the Company had accrued no interest and penalties related to unrecognized tax benefits. As of December 26, 2015, the Company had not recorded any tax provision for U.S. federal and state income taxes on approximately $2.7 million of undistributed earnings in foreign subsidiaries, which it expects to reinvest outside of the U.S. indefinitely. If the Company were to repatriate these earnings to the U.S., it would be subject to U.S. income taxes, an adjustment for foreign tax credits, and foreign withholding taxes. The determination of the amount of unrecognized deferred income tax liability related to these earnings is not practicable. The Company files income tax returns in the U.S. federal jurisdiction, certain U.S. states, and the United Kingdom. The Company is subject to U.S. federal income tax examination from calendar years 2013 to 2014, from 2009 to 2014 for state purposes, and 2012 to 2014 for the United Kingdom. The U.S. federal and U.S. state taxing authorities may choose to audit tax returns for tax years beyond the statute of limitation period due to significant tax attribute carryforwards from prior years, making adjustments only to carryforward attributes. On December 18, 2015, The Consolidated Appropriations Act of 2014 was signed into law, which retroactively reinstated and made permanent the federal research tax credit provisions form January 1, 2015 through December 31, 2015. In November 2015, the FASB issued ASU 2015-17, Balance Sheet Classification of Deferred Taxes. The ASU requires that deferred tax assets and liabilities be classified as noncurrent in the statement of financial position, thereby simplifying the current guidance that requires an entity to separate deferred assets and liabilities into current and noncurrent amounts. The ASU will be effective for the Company beginning in the first quarter of fiscal year 2018 though early adoption is permitted. The Company early-adopted the ASU on a prospective basis, as of December 26, 2015, and the statement of financial position as of December 26, 2015 reflects the revised classification of current deferred tax assets and liabilities as noncurrent.

Net Income (Loss) per Share

Net Income (Loss) per Share	12 Months Ended
	Dec. 26, 2015
Earnings Per Share [Abstract]
Net (Loss) Income per Share	Net Income (Loss) per Share The net income (loss) per share and weighted-average shares information presented in the consolidated financial statements reflect the Company’s one-for-three reverse stock split completed on May 20, 2013. Effective June 17, 2013, all shares of the then-outstanding redeemable convertible preferred stock were converted to common stock and are included in the weighted-average shares used to compute net income (loss) per share starting from the conversion date. Due to the net loss incurred in fiscal 2014 and 2013, potential dilutive securities were excluded from the calculation of diluted net loss per share attributable to common stockholders for such period as their effect was anti-dilutive. The following table presents the computation of basic and diluted net income (loss) per share attributable to common stockholders (in thousands, except per share data): Fiscal Year Ended December 26, 2015 December 27, 2014 December 28, Numerator: Net income (loss) attributable to common stockholders $ 6,186 $ (40,790 ) $ (9,518 ) Denominator: Weighted average shares used for basic net income (loss) per share computation 33,618 32,200 24,722 Weighted average effect of dilutive securities: Stock options 2,248 — — Weighted average shares used for diluted net income (loss) per share computation 35,866 32,200 24,722 Net income (loss) per share attributable to common stockholders : Basic $ 0.18 $ (1.27 ) $ (0.39 ) Diluted $ 0.17 $ (1.27 ) $ (0.39 ) The following shares of potentially dilutive securities were excluded from the computation of diluted net income (loss) per share for the periods presented (in thousands): Fiscal Year Ended December 26, 2015 December 27, 2014 December 28, 2013 Equity awards to purchase common stock 654 6,339 5,073

Segment Information

Segment Information	12 Months Ended
	Dec. 26, 2015
Segment Reporting [Abstract]
Segment Information	Segment Information Operating segments are defined as components of an enterprise that engage in business activities for which separate financial information is available and evaluated by the chief operating decision maker in deciding how to allocate resources and assessing performance. The Company’s chief operating decision maker is its chief executive officer. The chief executive officer reviews financial information presented on a consolidated basis, for purposes of allocating resources and evaluating financial performance. The Company has one business activity and there are no segment managers who are held accountable for operations, or plans for levels or components below the consolidated unit level. Accordingly, the Company operates as a single reportable segment. The following table summarizes the Company’s revenue by geographic region, based on the location to where the product was shipped (in thousands): Fiscal Year Ended December 26, 2015 December 27, 2014 December 28, 2013 United States $ 163,283 $ 116,921 $ 103,257 Rest of Americas 10,696 8,499 5,846 Europe, Middle East and Africa 32,167 21,769 19,753 Asia Pacific 15,829 9,941 11,439 Total $ 221,975 $ 157,130 $ 140,295 The Company’s long-lived assets by geographic region are summarized as follows (in thousands): As of December 26, 2015 December 27, 2014 United States $ 9,148 $ 7,218 Other 268 169 Total $ 9,416 $ 7,387

Supplementary Quarterly Financi

Supplementary Quarterly Financial Data	12 Months Ended
	Dec. 26, 2015
Quarterly Financial Information Disclosure [Abstract]
Supplementary Quarterly Financial Data (Unaudited)	Supplementary Quarterly Financial Data (Unaudited) The following table sets forth selected unaudited consolidated statement of operations data for each quarter of the two fiscal years ended December 26, 2015 (in thousands, except per share amounts): Three Months Ended Dec 26, Sept 26, June 27, March 28, Dec 27, Sept 27, June 28, March 29, Consolidated Statement of Operations Data: Revenue: Product $ 47,051 $ 38,717 $ 34,814 $ 32,152 $ 36,790 $ 26,180 $ 22,544 $ 20,080 Service 19,973 17,935 16,632 14,701 14,461 13,088 12,307 11,680 Total revenue 67,024 56,652 51,446 46,853 51,251 39,268 34,851 31,760 Cost of revenue: Product 10,262 9,613 9,558 9,445 10,319 7,396 6,281 7,005 Service 1,669 1,708 1,763 1,777 1,722 1,601 1,544 1,580 Total cost of revenue 11,931 11,321 11,321 11,222 12,041 8,997 7,825 8,585 Gross profit 55,093 45,331 40,125 35,631 39,210 30,271 27,026 23,175 Research and development 13,171 12,677 12,227 11,496 10,922 10,086 10,860 10,938 Sales and marketing 26,150 21,388 21,171 18,832 20,387 17,948 19,558 18,170 General and administrative 7,788 6,950 6,702 6,019 5,015 5,217 4,446 6,005 Total operating expenses 47,109 41,015 40,100 36,347 36,324 33,251 34,864 35,113 Income (loss) from operations 7,984 4,316 25 (716 ) 2,886 (2,980 ) (7,838 ) (11,938 ) Interest income 116 106 105 119 92 82 73 61 Other (expense) income, net (119 ) (69 ) 7 (10 ) (31 ) (28 ) 6 (41 ) Income (loss) before income tax (provision) benefit 7,981 4,353 137 (607 ) 2,947 (2,926 ) (7,759 ) (11,918 ) Income tax (provision) benefit (5,418 ) (73 ) (99 ) (88 ) (41 ) (66 ) (24,727 ) 3,700 Net income (loss) 2,563 4,280 38 (695 ) 2,906 (2,992 ) (32,486 ) (8,218 ) Net income (loss) per share attributable to common stockholders: Basic $ 0.07 $ 0.13 $ — $ (0.02 ) $ 0.09 $ (0.09 ) $ (1.01 ) $ (0.26 ) Diluted $ 0.07 $ 0.12 $ — $ (0.02 ) $ 0.09 $ (0.09 ) $ (1.01 ) $ (0.26 )

Summary of Significant Accoun21

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 26, 2015
Accounting Policies [Abstract]
Basis of Presentation and Consolidation	Basis of Presentation and Consolidation The Company prepared its consolidated financial statements in accordance with U.S. generally accepted accounting principles or GAAP and applicable rules and regulations of the Securities and Exchange Commission or the SEC. The consolidated financial statements include the accounts of the Company and its wholly owned subsidiaries. All intercompany accounts and transactions have been eliminated in consolidation.
Change in Fiscal Year End	Change in Fiscal Year End Effective January 1, 2013, the Company changed its reporting period from a calendar year ending on December 31 of each year to a 52- or 53-week fiscal year that ends on the last Saturday in December. Fiscal years 2015 , 2014 , and 2013 were each 52-week fiscal years ending on December 26, 2015 , December 27, 2014 , and December 28, 2013 , respectively, with each quarter in these fiscal years a 13-week quarter.
Use of Estimates	Use of Estimates The preparation of consolidated financial statements in conformity with GAAP requires management to make certain estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenues and expenses during the reported periods. On an ongoing basis, the Company evaluates its estimates, including but not limited to those related to revenue recognition, provision for doubtful accounts, warranty reserve, excess and obsolete inventory write-downs, stock-based compensation expense, depreciable lives, and income taxes. The Company bases its estimates on historical experience, projections for future performance and other assumptions that it believes to be reasonable under the circumstances. Actual results could differ materially from those estimates.
Reverse Stock Split	Reverse Stock Split Effective May 20, 2013, the Company completed a one-for-three reverse stock split, as approved by its Board of Directors (the “Board”). All shares and per share amounts set forth herein give effect to this reverse stock split.
Foreign Currency	Foreign Currency The Company uses the U.S. dollar as its functional currency. Foreign currency assets and liabilities are remeasured into U.S. dollars using the end-of-period exchange rates except for nonmonetary assets and liabilities, which are remeasured using historical exchange rates. Expenses are remeasured using an average exchange rate for the respective period. Gains or losses from foreign currency transactions are included in other expense, net. Foreign currency transaction gains and losses have not been material to the consolidated financial statements for all periods presented.
Cash Equivalents and Marketable Securities	Cash Equivalents and Marketable Securities All highly liquid marketable securities with original maturities of less than three months at the date of purchase are considered to be cash equivalents. Marketable securities are generally classified as available-for-sale for use in current operations, if required, and are reported at fair value, with unrealized gains and losses, net of tax, presented as a separate component of stockholders’ equity within accumulated other comprehensive income (loss). All realized gains and losses and unrealized losses resulting from declines in fair value that are other-than-temporary are recorded in other income (expense), net, in the period of occurrence. The Company uses the specific identification method to determine the realized gains and losses on investments. For all investments in marketable securities, the Company assesses whether the impairment is other-than-temporary. If the fair value of a security is less than its amortized cost basis, an impairment is considered other-than-temporary if (i) the Company has the intent to sell the security or it is more likely than not that the Company will be required to sell the security before recovery of its entire amortized cost basis, or (ii) the Company does not expect to recover the entire amortized cost of the security. If an impairment is considered other-than-temporary based on condition (i), the entire difference between the amortized cost and the fair value of the security is recognized in earnings. If an impairment is considered other-than-temporary based on condition (ii), the amount representing credit losses, defined as the difference between the present value of the cash flows expected to be collected and the amortized cost basis of the security, will be recognized in earnings, and the amount relating to all other factors will be recognized in accumulated other comprehensive income (loss). The Company evaluates both qualitative and quantitative factors such as duration and severity of the unrealized losses, credit ratings, default and loss rates of the underlying collateral, structure and credit enhancements to determine if a credit loss may exist.
Fair Value of Financial Instruments	Fair Value of Financial Instruments The Company records its financial assets and liabilities at fair value. The accounting guidance for fair value provides a framework for measuring fair value, clarifies the definition of fair value, and expands disclosures regarding fair value measurements. Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability (an exit price) in an orderly transaction between market participants at the reporting date. The accounting guidance establishes a three-tiered hierarchy, which prioritizes the inputs used in the valuation methodologies in measuring fair value: Level 1 – Quoted prices in active markets for identical assets or liabilities. Level 2 – Inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. Level 3 – Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. The Company recognizes transfers among Level 1, Level 2 and Level 3 classifications as of the actual date of the events or change in circumstances that caused the transfers. The Company’s financial instruments, including cash equivalents, accounts receivable, accounts payable and accrued liabilities have carrying amounts which approximate fair value due to the short-term maturity of these instruments.
Accounts Receivable	Accounts Receivable Accounts receivable, which represent trade accounts receivable from both channel partners and direct customers, are recorded at the invoiced amounts and do not bear interest. The Company extends credit to its customers in the normal course of business and performs ongoing credit evaluations of its customers. The Company generally requires no collateral from its customers. The Company reviews its accounts receivable to determine if it needs to establish an allowance for doubtful accounts for estimated losses resulting from the customer’s inability to make payments. Management determines the collectability of specific customer accounts by their past transaction history. If financial conditions of the Company’s customers were to deteriorate, adversely affecting their ability to make payments, additional allowances would be required. Estimates for allowance for doubtful accounts are charged to operating expenses and a credit to a valuation allowance.
Concentrations	Concentrations The Company operates in highly competitive and rapidly changing markets that could negatively impact the Company’s operating results. A number of components that meet the Company’s manufacturing requirements are available only from single source suppliers. In addition, the Company relies on one contract manufacturer to manufacture substantially all of its products. The inability of its single source suppliers and contract manufacturer to provide the Company with adequate supplies of high-quality components and products could cause a delay in order fulfillment, which could adversely affect the Company’s revenue, cost of revenue and operating results. Financial instruments that potentially subject the Company to significant concentrations of credit risk consist principally of cash, cash equivalents, short-term investments and accounts receivable. The majority of the Company's cash, cash equivalents and short-term investments are held in or managed by a limited number of major financial institutions in the United States that management believes are creditworthy. Such deposits may exceed the insured limits provided on them. The Company mitigates credit risk associated with its accounts receivable by performing ongoing credit evaluations of its customers and determines if it needs to establish an allowance for doubtful accounts for estimated losses based on management’s assessment of the collectability of customer accounts.
Inventories	Inventories Inventory is valued at the lower of cost computed on a first-in, first-out basis, or market value. The Company writes down inventory in excess of forecasted demand over a certain period, as a component of cost of revenue. In these cases, inventory is reduced to estimated realizable value based on historical usage and expected demand. At the point of inventory write-down, a new lower-cost basis for that inventory is established and subsequent changes in facts and circumstances do not result in the restoration or increase in that newly established cost basis. Inherent in the Company’s estimates of market value in determining inventory valuation are estimates related to economic trends, future demand for the Company’s products, and technical obsolescence of products. The Company uses a contract manufacturer to provide manufacturing services for its products. During the normal course of business, in order to manage manufacturing lead times and help ensure adequate component supply, the Company enters into agreements with the contract manufacturer that either allow it to procure inventory based upon criteria as defined by the Company, or establish the parameters defining the Company’s requirements. A portion of the Company’s reported purchase commitments arising from these agreements consists of non-cancelable commitments. The Company records a liability for firm, non-cancelable and unconditional purchase commitments for quantities in excess of its future demand forecasts consistent with the valuation of the Company’s excess and obsolete inventory.
Property and Equipment	Property and Equipment Property and equipment are stated at cost and depreciated using the straight–line method over the estimated useful lives of the assets. Leasehold improvements are amortized over the lesser of the useful life of these improvements or the remaining term of the lease. Maintenance and repairs are charged to operations as incurred.
Research and Development and Software Development Costs	Research and Development and Software Development Costs Research and development costs are expensed as incurred. The Company's software development process is essentially completed concurrent with the establishment of technological feasibility. To-date, software development costs qualifying for capitalization have not been material. Accordingly, the Company has not capitalized any software development costs.
Impairment of Long-Lived Assets	Impairment of Long-Lived Assets The Company reviews long-lived assets for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Recoverability is measured by comparison of the anticipated future net undiscounted cash flows to the related assets’ carrying values. If such assets are considered to be impaired, the impairment to be recognized is measured by the amount by which the carrying amount of the assets exceeds the projected discounted future net cash flows arising from the asset. No assets were determined to be impaired during any of the periods presented.
Revenue Recognition	Revenue Recognition The Company generates product revenue from sales of traffic visibility solutions to customers as well as service revenue from sales of maintenance and support contracts and other billable services. The Company typically sells products and services in a single transaction. The deliverables consist of traffic visibility solutions, maintenance and support, and other billable services. The Company’s typical arrangement includes the sale of one or multiple products that may include first year maintenance and support as well as standard warranty. Other arrangements consist of the sale of products together with maintenance and support or a renewal of maintenance and support contracts. Billable services are billed in advance or when service is provided and performed as requested by customers. Under maintenance and support contracts, services are provided as needed by customers over the fixed arrangement term. The Company does not grant its customers a general right of return or any refund terms, except to two of the Company’s distributors which have stock rotation rights and in that case, revenue is deferred until sell-through has occurred. Revenue from distributors is reported net of rebates, discounts and any other sales incentives. The Company recognizes revenue when (1) persuasive evidence of an arrangement exists, (2) delivery has occurred or services have been rendered, (3) the sales price is fixed or determinable and (4) collectability is reasonably assured. When sales arrangements contain multiple elements and software and non-software components that function together to deliver the products’ essential functionality, the Company allocates revenue to each element based on a selling price hierarchy: vendor-specific objective evidence or VSOE, if available, third party evidence or TPE, of the selling price if VSOE is not available, or best estimated selling prices or BESP if neither VSOE nor TPE is available. When the Company enters into arrangements to provide more than one product or service, or what the Company refers to as multiple deliverables, these arrangements are evaluated to determine if the multiple elements consist of more than one unit of accounting and can be separated accordingly. Based on separation criteria under the guidance, deliverables in multiple element arrangements can be segregated into separate units of accounting if they have value to the customer on a standalone basis. If deliverables can be separated into individual units of accounting, then the arrangement consideration is allocated among deliverables based on their relative selling price. Revenue from each deliverable is recognized when all requirements are met for that specific deliverable. If deliverables cannot be separated into separate units of accounting, then the arrangement will be accounted for as a single unit of accounting and revenue will be recognized when all requirements are met for all deliverables within the arrangement. The Company has established VSOE for maintenance and support contracts since the majority of selling prices fall within a narrow range when sold separately. TPE is not used since this information is not widely available in the market and the Company does not consider its products to be similar to or interchangeable with its competitors’ products in standalone sales to similarly situated customers. For deliverables with no established VSOE, such as standard product offerings, the Company determines the standalone selling price for such deliverables by establishing BESP, which incorporates historical selling prices, the effect of market conditions, gross margin objectives and pricing practices, as well as entity specific factors. The Company monitors and evaluates BESP on a regular basis to ensure that changes in circumstances are accounted for in a timely manner. Service revenue is recognized ratably over the contractual support period, which is typically one year but can be up to ten years . In accordance with contractual provisions, the Company may offer cooperative marketing funds based on a fixed dollar percentage of product sales to certain of its channel partners or to fund specific marketing activities for these partners. The Company records such amounts as a reduction to revenue or, if the Company has evidence of fair value of the separable and identifiable benefit received, as a marketing expense. Revenue is recorded net of sales taxes. Costs of products not yet recognized as revenue are deferred and included as a component of prepaid expenses and other current assets in the consolidated balance sheets.
Shipping and Handling Charges	Shipping and Handling Charges Shipping and handling costs are recorded in cost of revenue in the period products are shipped to customers.
Warranty	Warranty The Company provides five -year warranties on its hardware products against defects in manufacturing. The Company accrues for potential liability claims as a component of cost of product revenue based on historical trends of product failure rates and the expected material and labor costs to provide warranty services. The accrued warranty balance is reviewed periodically for adequacy and is included in accrued liabilities and in other non-current liabilities on the consolidated balance sheets.
Stock-Based Compensation	Stock-Based Compensation Stock-based compensation expense related to stock-based transactions, including employee and director awards, as well as employee stock purchase plan purchase rights (“ESPP purchase rights”), is measured and recognized in the consolidated financial statements based on fair value of the award on the grant date. Stock-based compensation expense related to equity awards that can be settled in cash is measured based on the fair value on each balance sheet date until the settlement dates. The fair value of option awards and ESPP purchase rights is estimated using the Black-Scholes option-pricing model. This model requires assumptions including the market value of the Company’s common stock, expected volatility, expected term of the award, expected dividend yield and risk-free interest rate. Expected term for stock option awards is determined based on the mid-point of the vest period and the contractual period of each option award due to the Company’s limited historical stock option exercise data. Expected volatility is established based on the historical volatility of the common stock of a peer group of publicly traded companies. The stock-based compensation expense, net of estimated forfeitures, is recognized on a graded-vesting basis over the requisite service periods of the awards, unless a performance-based condition exists. Expense for performance-based awards are recognized when the issuance of the underlying awards are probable. Expense for consultant awards are measured based on the fair value on the vest date. Expenses related to the option grants to consultants that have not been vested as of the reporting date are marked to market until the earlier of the commitment or the completion of the underlying performance. The Company estimates a forfeiture rate to calculate the stock-based compensation for its awards based on an analysis of its historical experience, analysis of employee turnover and other related factors.
Advertising Costs	Advertising Costs Expenses related to advertising of products are charged to sales and marketing expense as incurred. For all periods presented, advertising expenses were not material.
Income Taxes	Income Taxes The Company is subject to U.S. federal income taxes as well as state taxes. In addition, the Company is subject to taxes in the foreign jurisdictions where it operates. Prior to the LLC Conversion in May 2013, the Company was a Delaware limited liability company that passed through income and losses to its members. As a result, the Company was not subject to any U.S. federal or state income taxes as the related tax consequences were reported by the individual members. Effective upon the completion of the LLC Conversion, the Company accounts for income taxes using the asset and liability method, which requires the recognition of deferred tax assets and liabilities for the expected future tax consequences of events that have been recognized in its financial statements or tax returns. In addition, deferred tax assets are recorded for the future benefit of utilizing net operating losses and research and development credit carry forwards. Valuation allowances are provided when necessary to reduce deferred tax assets to the amount expected to be realized. Accordingly, the Company assessed the need for a valuation allowance based on the ASC 740 more-likely-than-not realization threshold criterion. Consideration was given to all positive and negative evidence related to the realization of the deferred tax assets. This assessment considered, among other matters, the nature, frequency and severity of recent and cumulative losses, forecasts of future profitability, the duration of statutory carryforward periods, experience with operating loss and tax credit carryforwards expiring, and tax planning alternatives. Significant judgment was required to determine whether a valuation allowance was necessary and the amount of such valuation allowance, if appropriate. In the event that the Company changes its determination as to the amount of deferred tax assets that can be realized, the Company will adjust its valuation allowance with a corresponding impact to the provision for income taxes in the period in which such determination is made. The Company applies the authoritative accounting guidance prescribing a threshold and measurement attribute for the financial recognition and measurement of a tax position taken or expected to be taken in a tax return. The Company recognizes liabilities for uncertain tax positions based on a two-step process. The first step is to evaluate the tax position for recognition by determining if the weight of available evidence indicates that it is more-likely-than-not that the position will be sustained on audit, including resolution of related appeals or litigation processes, if any. The second step requires the Company to estimate and measure the tax liability as the largest amount that is more-likely-than-not to be realized upon ultimate settlement. The Company also accounts for any related interest and penalty charges as a component of income taxes.
Comprehensive (Loss) Income	Comprehensive Income (Loss) Comprehensive income (loss) is defined as a change in equity of a business enterprise during a period, resulting from transactions from non-owner sources. Comprehensive income (loss) is comprised of all components of net income (loss) and all components of other comprehensive income (loss) within stockholders’ equity. The Company’s other comprehensive income (loss) includes unrealized gains and losses from its available-for-sale securities that are not considered other-than-temporarily impaired, net of taxes.
Earnings Per Share	Earnings Per Share Basic net income (loss) per share attributable to common stockholders is calculated by dividing the net income (loss) attributable to common stock holders by the weighted-average number of common shares outstanding for the period. Diluted net income per share attributable to common stockholders is computed by giving effect to all potential dilutive common stock outstanding during the period, including options, restricted stock units, or RSUs, and ESPP purchase rights. The computation of diluted net income does not assume conversion or exercise of potentially dilutive securities that would have an anti-dilutive effect on earnings. The dilutive effect of outstanding options is computed using the treasury stock method. In periods when the Company has incurred a net loss, potential dilutive common securities outstanding have been excluded from the calculation of diluted net loss per share attributable to common stockholders as their effect is antidilutive. Prior to the conversion of its redeemable convertible Series A preferred stock (the “Series A preferred stock”) to common stock, effective June 17, 2013, the Company applied the two-class method for calculating and presenting earnings per share as the Series A preferred stock was considered a participating security due to the rights of cumulative preferred return. Participating securities are defined as securities that participate in dividends with common units according to a pre-determined formula or a contractual obligation to share in the income of the entity. Under the two-class method, net income (loss) is allocated between common stock and other participating securities based on their participating rights. Accordingly, earnings allocated or distributed to the Series A preferred stock as well as the related number of outstanding shares of the Series A preferred stock have been excluded from the computation of basic and diluted net income (loss) per share attributable to common stockholders. Dilutive securities that were subject to the Company’s IPO were excluded from the Company’s diluted net income (loss) per share calculation for the periods before the close of the Company’s IPO in June 2013.
Recent Accounting Pronouncements	Recent Accounting Pronouncements In May 2014, the Financial Accounting Standards Board (the "FASB") issued an Accounting Standards Update related to revenue from contracts with customers, which supersedes the revenue recognition requirements in the current Accounting Standards Codification. This standard is based on the principle that revenue is recognized to depict the transfer of goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. This standard also requires additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments and changes in judgments and assets recognized from costs incurred to obtain or fulfill a contract. In August 2015 the FASB voted to defer the effective date by one year. The effective date of this standard will be the first quarter of fiscal 2019 using one of two retrospective application methods. The Company is currently evaluating the potential impact, if any, of this accounting standard update on its future consolidated financial statements. In June 2014, the FASB issued an authoritative standard related to stock compensation Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period. This standard requires that a performance target that affects vesting and that could be achieved after the requisite service period be treated as a performance condition. A company should apply the existing guidance as it relates to awards with performance conditions that affect vesting to account for such awards. Compensation cost should be recognized in the period in which it becomes probable that the performance target will be achieved and should represent the compensation cost attributable to the periods for which the requisite service has already been rendered. The amendments in this update are effective for annual periods and interim periods within annual periods beginning after December 15, 2015 and early adoption is permitted. The adoption of this guidance is not currently expected to have a material impact on the Company’s consolidated financial statements. In August 2014, the FASB issued an authoritative standard related to the disclosure of Uncertainties about an Entity’s Ability to Continue as a Going Concern, to provide guidance on management’s responsibility in evaluating whether there is a substantial doubt about a company’s ability to continue as a going concern and to provide related footnote disclosures. The effective date of this standard will be for annual periods ending after December 15, 2016 with early adoption permitted. The adoption of this guidance is not currently expected to have a material impact on the Company’s consolidated financial statements. In June 2015, the FASB issued an authoritative standard related to Technical Corrections and Improvements. The standard covers a wide range of topics including guidance clarification and reference corrections, simplification and minor improvements. Transition guidance varies based on the specific topic included in this standard. The topics that require transition guidance are effective for all entities for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015. Early adoption is permitted. All other topics were effective upon the issuance of this standard. The Company is currently evaluating the impact, if any, of this guidance on the Company’s consolidated financial statements. In July 2015, the FASB issued an authoritative standard related to disclosure of inventory, to provide guidance on management’s responsibility to measure inventory at the lower of cost and net realizable value. The effective date of this standard will be for annual periods ending after December 15, 2016 with early adoption permitted. The Company is currently evaluating the impact, if any, of this guidance on the Company’s consolidated financial statements. In November 2015, the FASB issued an authoritative standard to provide guidance regarding balance sheet classification of deferred taxes. The guidance requires companies to classify all deferred tax assets and liabilities as non-current on the balance sheet instead of separating deferred taxes into current and non-current amounts. This guidance is effective for public business entities for financial statements issued for annual periods beginning after December 15, 2016, and interim periods within those annual periods. The amendments can be applied retrospectively or prospectively with earlier application permitted as of the beginning of an interim or annual reporting period. The Company has chosen to early adopt, on a prospective basis, and as such has recorded all of its deferred tax assets and liabilities as non-current as of December 26, 2015.

Summary of Significant Accoun22

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 26, 2015
Accounting Policies [Abstract]
Customers Representing Major Revenue and Accounts Receivable	Customers that represented more than 10% of total revenue and accounts receivable are: Fiscal Year Ended December 26, 2015 December 27, 2014 December 28, 2013 Percent of Revenue: Customer A (distributor) 40 % 47 % 52 % Customer B (distributor) 21 % 16 % * * Represents less than 10% of total revenue As of December 26, 2015 December 27, 2014 Percent of Accounts Receivable: Customer A (distributor) 19 % * Customer B (distributor) 30 % 36 % Customer C (end-user) 11 % * * Represents less than 10% of total accounts receivable
Useful Lives of the Property and Equipment	The useful lives of the property and equipment are as follows: Furniture and fixtures 5 years Software 3 to 5 years Equipment and machinery 1.5 to 3 years Leasehold improvements Shorter of lease term or estimated useful life

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 26, 2015
Fair Value Disclosures [Abstract]
Components of Cash and Cash Equivalents	The components of the Company’s cash, cash equivalents and investments are as follows (in thousands): Fair Value Measured Using December 26, 2015 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Cash and cash equivalents: Money market funds $ 83,852 $ 83,852 $ — $ — Commercial paper 4,497 — 4,497 Total cash equivalents 88,349 83,852 4,497 — Cash 31,863 Total cash and cash equivalents $ 120,212 Short-term investments: Corporate debt securities $ 14,560 $ — $ 14,560 $ — Commercial paper 8,986 — 8,986 — U.S. agency debt securities 29,008 — 29,008 — U.S. government securities 37,447 — 37,447 — Total short-term investments $ 90,001 $ — $ 90,001 $ — Fair Value Measured Using December 27, 2014 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Cash and cash equivalents: Money market funds $ 15,976 $ 15,976 $ — $ — Total cash equivalents 15,976 15,976 — — Cash 22,965 Total cash and cash equivalents $ 38,941 Short-term investments: Corporate debt securities $ 58,707 $ — $ 58,707 $ — U.S. agency debt securities 31,779 — 31,779 — U.S. government securities 19,979 — 19,979 — Total short-term investments $ 110,465 $ — $ 110,465 $ —
Schedule of Amortized Cost, Gross Unrealized Gains and Losses and Fair Value of Investments	Financial instruments measured at amortized costs, gross unrealized gain, gross unrealized loss and fair value by significant investment categories are summarized as follows (in thousands): December 26, 2015 Amortized Costs Gross Unrealized Gains Gross Unrealized Losses Fair Value Cash and cash equivalents: Money market funds $ 83,852 $ — $ — $ 83,852 Commercial paper 4,497 — — 4,497 Cash 31,863 — — 31,863 Total cash and cash equivalents $ 120,212 $ — $ — $ 120,212 Short-term investments: Corporate debt securities $ 14,570 $ — $ (10 ) $ 14,560 Commercial paper 8,986 — — 8,986 U.S. agency debt securities 29,031 — (23 ) 29,008 U.S. government securities 37,461 3 (17 ) 37,447 Total short-term investments $ 90,048 $ 3 $ (50 ) $ 90,001 December 27, 2014 Amortized Costs Gross Unrealized Gains Gross Unrealized Losses Fair Value Cash and cash equivalents: Money market funds $ 15,976 $ — $ — $ 15,976 Cash 22,965 — — 22,965 Total cash and cash equivalents $ 38,941 $ — $ — $ 38,941 Short-term investments: Corporate debt securities $ 58,777 $ 4 $ (74 ) $ 58,707 U.S. agency debt securities 31,800 1 (22 ) 31,779 U.S. government securities 19,982 7 (10 ) 19,979 Total short-term investments $ 110,559 $ 12 $ (106 ) $ 110,465
Schedule of Contractual Maturity Date of Marketable Securities	The contractual maturity date of the cash, cash equivalents and short-term investments was as follows (in thousands): As of December 26, 2015 December 27, 2014 Due within one year $ 177,852 $ 90,555 Due between one and five years 498 35,886 Total 178,350 126,441 Cash 31,863 22,965 Total $ 210,213 $ 149,406

Balance Sheet Components (Table

Balance Sheet Components (Tables)	12 Months Ended
	Dec. 26, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Inventories	Inventories are comprised of the following (in thousands): As of December 26, 2015 December 27, 2014 Raw materials $ 76 $ 433 Finished goods 3,737 6,118 Total inventories, net $ 3,813 $ 6,551
Property and Equipment, Net	Property and equipment, net, are comprised of the following (in thousands): As of December 26, 2015 December 27, 2014 Equipment and machinery $ 14,932 $ 12,189 Furniture and fixtures 308 430 Leasehold improvements 2,248 2,256 Software 1,963 1,824 Total property and equipment 19,451 16,699 Less accumulated depreciation and amortization (10,035 ) (9,312 ) Total property and equipment, net $ 9,416 $ 7,387
Accrued Liabilities	Accrued liabilities are comprised of the following (in thousands): As of December 26, 2015 December 27, 2014 Accrued employee related costs $ 25,392 $ 16,021 Accrued inventory and other purchases 2,452 1,830 Accrued taxes payable 1,918 1,183 Accrued professional services 1,655 761 Other accruals 5,917 3,043 Total accrued liabilities $ 37,334 $ 22,838
Accrued Warranty Liability	Accrued Warranty is comprised of (in thousands): Fiscal Year Ended December 26, 2015 December 27, 2014 December 28, 2013 Accrued warranty balance at beginning of period $ 875 $ 686 $ 350 Accrual for warranty during the period 984 949 970 Actual costs incurred (1,052 ) (760 ) (634 ) Accrued warranty balance at end of period $ 807 $ 875 $ 686 As of Warranty accrual reported as: December 26, 2015 December 27, 2014 Current $ 490 $ 484 Non-current 317 391 Total accrued warranty $ 807 $ 875
Deferred Revenue	Deferred revenue is comprised of the following (in thousands): As of December 26, 2015 December 27, 2014 Deferred service revenue $ 73,454 $ 51,699 Deferred product revenue $ 8,677 $ 3,806 Total deferred revenue $ 82,131 $ 55,505
Accumulated Other Comprehensive Income	The following summarizes the activity within accumulated other comprehensive income (loss) (in thousands): Accumulated Other Comprehensive Income (Loss) Net Unrealized Gains (loss) Balance as of December 31, 2012 $ — Available-for-sale securities: Unrealized gains, net $ 23 Total other comprehensive income $ 23 Balance as of December 28, 2013 $ 23 Available-for-sale securities: Unrealized losses $ (117 ) Total other comprehensive loss $ (117 ) Balance as of December 27, 2014 $ (94 ) Available-for-sale securities: Unrealized gains, net 47 Total other comprehensive income 47 Balance as of December 26, 2015 $ (47 )

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 26, 2015
Commitments and Contingencies Disclosure [Abstract]
Future Minimum Lease Payments Under Non-Cancelable Operating Leases	Future minimum lease payments under non-cancelable operating leases as of December 26, 2015 were as follows (in thousands): Fiscal Year: 2016 3,763 2017 3,360 2018 957 2019 82 Total $ 8,162

Performance Unit Plan (Tables)

Performance Unit Plan (Tables)	12 Months Ended
	Dec. 26, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Performance Unit Plan Activity	The following table summarizes the Company’s PUP activity: PUPS Outstanding PUPS Available for Grant Number of PUPS Weighted- Average Base Price Balances — December 31, 2012 218,160 1,404,812 0.15 Settled — (1,057,772 ) 0.15 Cancelled 347,040 (347,040 ) 0.15 Termination of the Plan (565,200 ) — 0.15 Balances — December 28, 2013 — —

Preferred Stock and Stockhold27

Preferred Stock and Stockholders' Equity (Tables)	12 Months Ended
	Dec. 26, 2015
Equity [Abstract]
Schedule Of Share Based Compensation Stock Options Activity By Plan Table	The following table summarizes the activity under the Option Plan prior to its termination (in shares): Number of shares Shares available for future grant at December 31, 2012 732,267 Additional authorization 1,666,667 Options granted (1,426,849 ) RSUs granted (507,264 ) Options cancelled 64,653 RSUs cancelled 3,234 Transferred to 2013 Equity Incentive Plan upon termination (532,708 ) Shares available for future grant at December 28, 2013 —
Schedule of Share-based Compensation, Stock Options, Activity	The following table summarizes the stock option activity related to shares of common stock under the Company’s Option Plans: Number of Stock Options Outstanding Weighted- Average Exercise Price Weighted- Average Remaining Contractual Life (Years) Aggregate Intrinsic Value (in thousands) Balance — December 31, 2012 2,402,398 $ 7.92 9.40 $ 12,527 Options granted 1,604,847 $ 11.34 Options exercised (344,592 ) $ 4.99 Options cancelled (295,016 ) $ 8.85 Balance — December 28, 2013 3,367,637 $ 9.77 8.78 $ 62,725 Options granted 646,444 $ 20.21 Options exercised (790,147 ) $ 6.73 Options cancelled (843,966 ) $ 11.75 Balance — December 27, 2014 2,379,968 $ 12.91 7.50 $ 14,368 Options granted 408,000 $ 21.44 Options exercised (523,398 ) $ 8.42 Options cancelled (93,850 ) $ 9.76 Balance — December 26, 2015 2,170,720 $ 15.73 7.14 $ 24,910 Vested and expected to vest — December 28, 2013 3,216,818 $ 9.68 8.64 $ 60,034 Exercisable — December 28, 2013 972,268 $ 6.34 8.65 $ 21,344 Vested and expected to vest — December 27, 2014 2,230,425 $ 12.71 8.17 $ 13,754 Exercisable — December 27, 2014 936,061 $ 9.71 7.85 $ 7,643 Vested and expected to vest — December 26, 2015 2,066,613 $ 15.55 7.14 $ 24,088 Exercisable — December 26, 2015 1,114,119 $ 13.23 7.20 $ 15,536
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range	Additional information regarding the Company’s outstanding stock options and vested and exercisable stock options is summarized below: As of December 26, 2015 Options Outstanding Options Vested and Exercisable Exercise Prices Number of Stock Options Outstanding Weighted- Average Remaining Contractual Life (Years) Weighted- Average Exercise Price per Share Shares Subject to Stock Options Weighted- Average Exercise Price per Share $0.00 - $10.85 508,423 6.9 $ 6.32 355,089 $ 5.31 $11.02 - $13.11 523,706 7.1 $ 12.26 353,950 $ 12.33 $14.70 - $19.00 477,619 7.8 $ 17.05 284,017 $ 17.07 $21.44 - $29.36 446,000 6.3 $ 22.11 19,791 $ 29.36 $29.47 - $30.51 214,972 8.1 $ 30.27 101,272 $ 30.23 2,170,720 7.1 $ 15.73 1,114,119 $ 13.23
Schedule of Unvested Restricted Stock Units Roll Forward	The following table summarizes the RSU activity under the Company’s Option Plans: Number of RSUs Outstanding Weighted- Average Grant Date Fair Value Weighted- Average Remaining Contractual Life (Years) Aggregate Intrinsic Value (in thousands) Balance - December 31, 2012 149,841 $ 11.12 1.98 1,965 RSUs granted 764,509 $ 22.13 RSUs vested (50,849 ) $ 11.06 RSUs canceled (22,552 ) $ 16.16 Balance - December 28, 2013 840,949 $ 21.00 1.40 23,790 RSUs granted 1,668,228 $ 19.58 RSUs vested (397,239 ) $ 21.18 RSUs canceled (378,713 ) $ 24.64 Balance - December 27, 2014 1,733,225 $ 18.79 1.27 $ 30,245 RSUs granted 1,364,465 RSUs vested (1,010,609 ) RSUs canceled (307,742 ) Balance - December 26,2015 1,779,339 $ 22.64 1.53 $ 47,722 Vested and expected to vest — December 28, 2013 783,633 $ 20.89 1.35 $ 22,169 Vested and expected to vest — December 27, 2014 1,521,264 $ 18.66 1.18 $ 26,580 Vested and expected to vest — December 26, 2015 1,510,440 $ 22.53 1.43 $ 40,510
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions	The fair value of the option awards and ESPP purchase rights granted and the assumptions used in the Black-Scholes option pricing model are summarized as follows: Fiscal Year Ended December 26, December 27, December 28, Stock option awards: Expected term (in years) 4.6 5.27 - 6.08 5.00 - 6.08 Risk-free interest rate 1.6% 1.69% - 1.90% 0.89% - 1.84% Expected volatility 56.04% 58.9% - 61.9% 62.1% - 65.3% Expected dividend rate —% —% —% Grant date fair value per award $10.11 $5.94 - $17.67 $9.44 - $23.29 ESPP purchase right: Expected term (in years) 0.5 - 2.0 0.5 - 2.0 0.68 - 2.18 Risk-free interest rate 0.07% - 0.72% 0.05% - 0.42% 0.08% - 0.20% Expected volatility 37.6% - 59.9% 53.1% - 63.1% 53.6% - 63.1% Expected dividend rate —% —% —% Grant date fair value per share $5.48 - $12.64 $3.48 - $13.06 $12.11 - $15.68
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs	The following table summarizes the stock-based compensation expense recorded in the Company’s consolidated statement of operations (in thousands): Fiscal Year Ended December 26, December 27, December 28, Cost of revenue $ 1,872 $ 1,679 $ 3,496 Research and development 9,126 8,102 11,467 Sales and marketing 9,466 8,212 11,034 General and administrative 9,304 6,665 6,546 Total stock-based compensation expense $ 29,768 $ 24,658 $ 32,543
Shares Reserved For Future Issuance Table	The Company had the following shares of common stock reserved for future issuance (in shares): As of December 26, 2015 December 27, 2014 Option Plan: Common stock subject to options outstanding 1,068,808 1,640,500 RSUs outstanding 58,949 197,448 Shares available for future grants — — 2013 Equity Plan: Common stock subject to options outstanding 1,105,356 745,912 RSUs outstanding 1,720,390 1,533,777 Shares available for future grants 3,753,018 3,656,706 ESPP 332,351 420,517 Common stock reserved for future issuances 8,038,872 8,194,860

Income Tax (Tables)

Income Tax (Tables)	12 Months Ended
	Dec. 26, 2015
Income Tax Disclosure [Abstract]
(Loss) Income Before Income Tax Benefit (Provision)	(loss) before income tax (provision) benefit consisted of the following (in thousands): Fiscal Year Ended December 26, 2015 December 27, 2014 December 28, 2013 United States $ 10,326 $ (20,682 ) $ (31,024 ) Foreign 1,538 1,026 824 Total income (loss) before income tax (provision) benefit $ 11,864 $ (19,656 ) $ (30,200 )
Income Tax Benefit (Provision)	The income tax (provision) benefit consisted of the following (in thousands): Fiscal Year Ended December 26, 2015 December 27, 2014 December 28, 2013 Federal: Current $ (4,162 ) $ — — Deferred — (19,504 ) 19,504 State: Current (926 ) (24 ) (10 ) Deferred — (1,373 ) 1,373 Foreign: Current (661 ) (285 ) (216 ) Deferred 71 52 12 Total income tax (provision) benefit $ (5,678 ) $ (21,134 ) $ 20,663
Difference Between Income Taxes Computed at Federal Statutory Income Tax rate and Income Tax Benefit	The items accounting for the difference between income taxes computed at the federal statutory income tax rate and the income tax (provision) benefit consisted of the following (dollars in thousands): Fiscal Year Ended December 26, 2015 December 27, 2014 December 28, 2013 Federal statutory rate 35 % 35 % 35 % Effect of: Tax (provision) benefit at federal statutory rate $ (4,153 ) $ 6,881 $ 10,570 State tax (provision) benefit, net of federal tax (provision) benefit (405 ) 515 376 ESPP (723 ) (1,106 ) (1,760 ) Other permanent items (305 ) (215 ) (281 ) Impact of foreign operations (8 ) 132 37 Tax credits 3,205 2,106 240 LLC income flow-through — — (3,319 ) Recognition of deferred tax assets — — 14,800 Change in valuation allowance (3,289 ) (29,447 ) — Total income tax (provision) benefit $ (5,678 ) $ (21,134 ) 20,663
Summary of Valuation Allowance	The following table presents the activity in the valuation allowance: Fiscal Year Ended December 26, 2015 December 27, 2014 December 28, 2013 Balance at the beginning of period $ 27,851 $ — $ — Additions 5,288 27,851 — Balance at End of Period $ 33,139 $ 27,851 $ —
Deferred Tax Assets and Liabilities	The components of the Company’s deferred tax assets and liabilities are as follows (in thousands): As of December 26, 2015 December 27, 2014 Deferred tax assets: Stock-based compensation $ 12,895 $ 10,672 Fixed assets 3,938 4,272 Net operating loss — 432 Accruals and reserves 6,750 4,761 Deferred revenue 4,895 3,896 Inventory reserve 971 1,231 Credits 3,825 2,651 Gross deferred tax assets 33,274 27,915 Valuation allowance (33,139 ) (27,851 ) Total deferred tax assets 135 64 Deferred tax liabilities — — Total $ 135 $ 64
Reconciliation of Gross Unrecognized Tax Benefit	A reconciliation of the beginning and ending amount of the unrecognized income tax benefits during the tax periods ended December 26, 2015 and December 27, 2014 are as follows (in thousands): Fiscal Year Ended December 26, 2015 December 27, 2014 December 28, 2013 Unrecognized tax benefits at the beginning of the period $ 2,258 $ 186 $ — Additions for tax positions related to the current year 1,424 1,824 186 Additions for tax positions related to the prior year 112 248 — Reductions for tax positions related to the prior year (547 ) — — Unrecognized tax benefits at the end of the period $ 3,247 $ 2,258 $ 186

Net Income (Loss) per Share (Ta

Net Income (Loss) per Share (Tables)	12 Months Ended
	Dec. 26, 2015
Earnings Per Share [Abstract]
Net Income (Loss) per Share and Weighted-Average Shares	The following table presents the computation of basic and diluted net income (loss) per share attributable to common stockholders (in thousands, except per share data): Fiscal Year Ended December 26, 2015 December 27, 2014 December 28, Numerator: Net income (loss) attributable to common stockholders $ 6,186 $ (40,790 ) $ (9,518 ) Denominator: Weighted average shares used for basic net income (loss) per share computation 33,618 32,200 24,722 Weighted average effect of dilutive securities: Stock options 2,248 — — Weighted average shares used for diluted net income (loss) per share computation 35,866 32,200 24,722 Net income (loss) per share attributable to common stockholders : Basic $ 0.18 $ (1.27 ) $ (0.39 ) Diluted $ 0.17 $ (1.27 ) $ (0.39 )
Potentially Dilutive Securities Excluded from Computation of Diluted Net (loss) Income per Common Share	The following shares of potentially dilutive securities were excluded from the computation of diluted net income (loss) per share for the periods presented (in thousands): Fiscal Year Ended December 26, 2015 December 27, 2014 December 28, 2013 Equity awards to purchase common stock 654 6,339 5,073

Segment Information (Tables)

Segment Information (Tables)	12 Months Ended
	Dec. 26, 2015
Segment Reporting [Abstract]
Revenue and Long-Lived Assets by Geographic Region	The following table summarizes the Company’s revenue by geographic region, based on the location to where the product was shipped (in thousands): Fiscal Year Ended December 26, 2015 December 27, 2014 December 28, 2013 United States $ 163,283 $ 116,921 $ 103,257 Rest of Americas 10,696 8,499 5,846 Europe, Middle East and Africa 32,167 21,769 19,753 Asia Pacific 15,829 9,941 11,439 Total $ 221,975 $ 157,130 $ 140,295 The Company’s long-lived assets by geographic region are summarized as follows (in thousands): As of December 26, 2015 December 27, 2014 United States $ 9,148 $ 7,218 Other 268 169 Total $ 9,416 $ 7,387

Supplementary Quarterly Finan31

Supplementary Quarterly Financial Data (Tables)	12 Months Ended
	Dec. 26, 2015
Quarterly Financial Information Disclosure [Abstract]
Selected Unaudited Consolidated Statement of Operations Data for Each Quarter	The following table sets forth selected unaudited consolidated statement of operations data for each quarter of the two fiscal years ended December 26, 2015 (in thousands, except per share amounts): Three Months Ended Dec 26, Sept 26, June 27, March 28, Dec 27, Sept 27, June 28, March 29, Consolidated Statement of Operations Data: Revenue: Product $ 47,051 $ 38,717 $ 34,814 $ 32,152 $ 36,790 $ 26,180 $ 22,544 $ 20,080 Service 19,973 17,935 16,632 14,701 14,461 13,088 12,307 11,680 Total revenue 67,024 56,652 51,446 46,853 51,251 39,268 34,851 31,760 Cost of revenue: Product 10,262 9,613 9,558 9,445 10,319 7,396 6,281 7,005 Service 1,669 1,708 1,763 1,777 1,722 1,601 1,544 1,580 Total cost of revenue 11,931 11,321 11,321 11,222 12,041 8,997 7,825 8,585 Gross profit 55,093 45,331 40,125 35,631 39,210 30,271 27,026 23,175 Research and development 13,171 12,677 12,227 11,496 10,922 10,086 10,860 10,938 Sales and marketing 26,150 21,388 21,171 18,832 20,387 17,948 19,558 18,170 General and administrative 7,788 6,950 6,702 6,019 5,015 5,217 4,446 6,005 Total operating expenses 47,109 41,015 40,100 36,347 36,324 33,251 34,864 35,113 Income (loss) from operations 7,984 4,316 25 (716 ) 2,886 (2,980 ) (7,838 ) (11,938 ) Interest income 116 106 105 119 92 82 73 61 Other (expense) income, net (119 ) (69 ) 7 (10 ) (31 ) (28 ) 6 (41 ) Income (loss) before income tax (provision) benefit 7,981 4,353 137 (607 ) 2,947 (2,926 ) (7,759 ) (11,918 ) Income tax (provision) benefit (5,418 ) (73 ) (99 ) (88 ) (41 ) (66 ) (24,727 ) 3,700 Net income (loss) 2,563 4,280 38 (695 ) 2,906 (2,992 ) (32,486 ) (8,218 ) Net income (loss) per share attributable to common stockholders: Basic $ 0.07 $ 0.13 $ — $ (0.02 ) $ 0.09 $ (0.09 ) $ (1.01 ) $ (0.26 ) Diluted $ 0.07 $ 0.12 $ — $ (0.02 ) $ 0.09 $ (0.09 ) $ (1.01 ) $ (0.26 )

Summary of Significant Accoun32

Summary of Significant Accounting Policies - Additional Information (Detail) $ in Thousands	May. 20, 2013	Dec. 26, 2015USD ($)	Sep. 26, 2015USD ($)	Jun. 27, 2015USD ($)	Mar. 28, 2015USD ($)	Dec. 27, 2014USD ($)	Sep. 27, 2014USD ($)	Jun. 28, 2014USD ($)	Mar. 29, 2014USD ($)	Dec. 26, 2015USD ($)	Dec. 27, 2014USD ($)	Dec. 28, 2013USD ($)
Schedule Of Significant Accounting Policies [Line Items]
Stock split conversion ratio	0.33333333333
Sales and marketing		$ 26,150	$ 21,388	$ 21,171	$ 18,832	$ 20,387	$ 17,948	$ 19,558	$ 18,170	$ 87,541	$ 76,063	$ 72,024
Accounts Receivable, allowance		309				0				309	0
Written-down inventory, Gross										1,859	3,760	$ 852
Recovery of inventory write down										900
Deferred product costs		1,600				$ 800				$ 1,600	$ 800
Product warranties period (in years)										5 years
Minimum
Schedule Of Significant Accounting Policies [Line Items]
Services revenue, recognition period (in years)										1 year
Maximum
Schedule Of Significant Accounting Policies [Line Items]
Services revenue, recognition period (in years)										10 years
Out-of-Period Adjustments
Schedule Of Significant Accounting Policies [Line Items]
Sales and marketing		$ 600

Summary of Significant Accoun33

Summary of Significant Accounting Policies - Customers Representing Major Revenue and Accounts Receivable (Detail)	12 Months Ended
	Dec. 26, 2015	Dec. 27, 2014	Dec. 28, 2013
Total Revenue | Customer A (distributor)
Concentration Risk [Line Items]
Concentration risk	40.00%	47.00%	52.00%
Total Revenue | Customer B (distributor)
Concentration Risk [Line Items]
Concentration risk	21.00%	16.00%	0.00%
Accounts Receivable | Customer A (distributor)
Concentration Risk [Line Items]
Concentration risk	19.00%
Accounts Receivable | Customer B (distributor)
Concentration Risk [Line Items]
Concentration risk	30.00%	36.00%
Accounts Receivable | Customer C (end-user)
Concentration Risk [Line Items]
Concentration risk	11.00%

Summary of Significant Accoun34

Summary of Significant Accounting Policies - Useful Lives of Property and Equipment (Detail)	12 Months Ended
	Dec. 26, 2015
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Useful lives of the property and equipment (in years)	5 years
Software | Minimum
Property, Plant and Equipment [Line Items]
Useful lives of the property and equipment (in years)	3 years
Software | Maximum
Property, Plant and Equipment [Line Items]
Useful lives of the property and equipment (in years)	5 years
Equipment and machinery | Minimum
Property, Plant and Equipment [Line Items]
Useful lives of the property and equipment (in years)	1 year 6 months
Equipment and machinery | Maximum
Property, Plant and Equipment [Line Items]
Useful lives of the property and equipment (in years)	3 years
Leasehold Improvements
Property, Plant and Equipment [Line Items]
Useful lives of the property and equipment	Shorter of lease term or estimated useful life

Fair Value Measurements - Compo

Fair Value Measurements - Components of Cash and Cash Equivalents (Detail) - USD ($) $ in Thousands	Dec. 26, 2015	Dec. 27, 2014
Cash and cash equivalents:
Cash and cash equivalents	$ 120,212	$ 38,941
Short-term investments:
Short-term investments	90,001	110,465
Money market funds
Cash and cash equivalents:
Cash and cash equivalents	83,852	15,976
Commercial Paper
Cash and cash equivalents:
Cash and cash equivalents	4,497
Short-term investments:
Short-term investments	8,986
Cash Equivalents
Cash and cash equivalents:
Cash and cash equivalents	88,349	15,976
Cash
Cash and cash equivalents:
Cash and cash equivalents	31,863	22,965
Corporate debt securities
Short-term investments:
Short-term investments	14,560	58,707
U.S. agency debt securities
Short-term investments:
Short-term investments	29,008	31,779
U.S. government securities
Short-term investments:
Short-term investments	37,447	19,979
Quoted Prices in Active Markets for Identical Assets (Level 1)
Short-term investments:
Short-term investments	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Money market funds
Cash and cash equivalents:
Cash and cash equivalents	83,852	15,976
Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial Paper
Cash and cash equivalents:
Cash and cash equivalents	0
Short-term investments:
Short-term investments	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Cash Equivalents
Cash and cash equivalents:
Cash and cash equivalents	83,852	15,976
Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate debt securities
Short-term investments:
Short-term investments	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. agency debt securities
Short-term investments:
Short-term investments	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. government securities
Short-term investments:
Short-term investments	0	0
Significant Other Observable Inputs (Level 2)
Short-term investments:
Short-term investments	90,001	110,465
Significant Other Observable Inputs (Level 2) | Money market funds
Cash and cash equivalents:
Cash and cash equivalents	0	0
Significant Other Observable Inputs (Level 2) | Commercial Paper
Cash and cash equivalents:
Cash and cash equivalents	4,497
Short-term investments:
Short-term investments	8,986
Significant Other Observable Inputs (Level 2) | Cash Equivalents
Cash and cash equivalents:
Cash and cash equivalents	4,497	0
Significant Other Observable Inputs (Level 2) | Corporate debt securities
Short-term investments:
Short-term investments	14,560	58,707
Significant Other Observable Inputs (Level 2) | U.S. agency debt securities
Short-term investments:
Short-term investments	29,008	31,779
Significant Other Observable Inputs (Level 2) | U.S. government securities
Short-term investments:
Short-term investments	37,447	19,979
Significant Unobservable Inputs (Level 3)
Short-term investments:
Short-term investments	0	0
Significant Unobservable Inputs (Level 3) | Money market funds
Cash and cash equivalents:
Cash and cash equivalents	0	0
Significant Unobservable Inputs (Level 3) | Commercial Paper
Short-term investments:
Short-term investments	0
Significant Unobservable Inputs (Level 3) | Cash Equivalents
Cash and cash equivalents:
Cash and cash equivalents	0	0
Significant Unobservable Inputs (Level 3) | Corporate debt securities
Short-term investments:
Short-term investments	0	0
Significant Unobservable Inputs (Level 3) | U.S. agency debt securities
Short-term investments:
Short-term investments	0	0
Significant Unobservable Inputs (Level 3) | U.S. government securities
Short-term investments:
Short-term investments	$ 0	$ 0

Fair Value Measurements - Finan

Fair Value Measurements - Financial Instruments Measured at Amortized Costs, Gross Unrealized Gain, Gross Unrealized Loss and Fair Value by Significant Investment Categories (Detail) - USD ($) $ in Thousands	Dec. 26, 2015	Dec. 27, 2014
Cash and Cash Equivalents
Cash And Cash Equivalents And Short Term Investments [Line Items]
Amortized Cost Basis	$ 120,212	$ 38,941
Fair Value	120,212	38,941
Cash and Cash Equivalents | Money market funds
Cash And Cash Equivalents And Short Term Investments [Line Items]
Amortized Cost Basis	83,852	15,976
Fair Value	83,852	15,976
Cash and Cash Equivalents | Commercial Paper
Cash And Cash Equivalents And Short Term Investments [Line Items]
Amortized Cost Basis	4,497
Fair Value	4,497
Cash and Cash Equivalents | Cash
Cash And Cash Equivalents And Short Term Investments [Line Items]
Amortized Cost Basis	31,863	22,965
Fair Value	31,863	22,965
Short-term Investments
Cash And Cash Equivalents And Short Term Investments [Line Items]
Amortized Cost Basis	90,048	110,559
Gross Unrealized Gains	3	12
Gross Unrealized Losses	(50)	(106)
Fair Value	90,001	110,465
Short-term Investments | Commercial Paper
Cash And Cash Equivalents And Short Term Investments [Line Items]
Amortized Cost Basis	8,986
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Fair Value	8,986
Short-term Investments | Corporate debt securities
Cash And Cash Equivalents And Short Term Investments [Line Items]
Amortized Cost Basis	14,570	58,777
Gross Unrealized Gains	0	4
Gross Unrealized Losses	(10)	(74)
Fair Value	14,560	58,707
Short-term Investments | U.S. agency debt securities
Cash And Cash Equivalents And Short Term Investments [Line Items]
Amortized Cost Basis	29,031	31,800
Gross Unrealized Gains	0	1
Gross Unrealized Losses	(23)	(22)
Fair Value	29,008	31,779
Short-term Investments | U.S. government securities
Cash And Cash Equivalents And Short Term Investments [Line Items]
Amortized Cost Basis	37,461	19,982
Gross Unrealized Gains	3	7
Gross Unrealized Losses	(17)	(10)
Fair Value	$ 37,447	$ 19,979

Fair Value Measurements - Contr

Fair Value Measurements - Contractual Maturity Date of Short-Term Investments (Detail) - USD ($) $ in Thousands	Dec. 26, 2015	Dec. 27, 2014
Contractual Maturity Date of Short-Term Investments [Abstract]
Due within one year	$ 177,852	$ 90,555
Due between one and five years	498	35,886
Total	178,350	126,441
Cash	31,863	22,965
Total	$ 210,213	$ 149,406

Fair Value Measurements - Narra

Fair Value Measurements - Narrative (Details)	Dec. 26, 2015USD ($)security
Fair Value Disclosures [Abstract]
Liabilities measured at fair value | $	$ 0
Number of securities in an unrealized loss position for granter than 12 months (security) | security	0

Balance Sheet Components - Inve

Balance Sheet Components - Inventories (Detail) - USD ($) $ in Thousands	Dec. 26, 2015	Dec. 27, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Raw materials	$ 76	$ 433
Finished goods	3,737	6,118
Total inventories	$ 3,813	$ 6,551

Balance Sheet Components - Prop

Balance Sheet Components - Property and Equipment, Net (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 26, 2015	Dec. 27, 2014	Dec. 28, 2013
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 19,451	$ 16,699
Less accumulated depreciation and amortization	(10,035)	(9,312)
Total property and equipment, net	9,416	7,387
Depreciation	4,800	4,300	$ 2,600
Equipment and machinery
Property, Plant and Equipment [Line Items]
Property and equipment, gross	14,932	12,189
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, gross	308	430
Leasehold Improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	2,248	2,256
Software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 1,963	$ 1,824

Balance Sheet Components - Accr

Balance Sheet Components - Accrued Liabilities (Detail) - USD ($) $ in Thousands	Dec. 26, 2015	Dec. 27, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accrued employee related costs	$ 25,392	$ 16,021
Accrued inventory and other purchases	2,452	1,830
Accrued taxes payable	1,918	1,183
Accrued professional services	1,655	761
Other accruals	5,917	3,043
Total accrued liabilities	$ 37,334	$ 22,838

Balance Sheet Components - Ac42

Balance Sheet Components - Accrued Warranty (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 26, 2015	Dec. 27, 2014	Dec. 28, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accrued warranty balance at beginning of period	$ 875	$ 686	$ 350
Accrual for warranty during the period	984	949	970
Actual costs incurred	(1,052)	(760)	(634)
Accrued warranty balance at end of period	807	875	$ 686
Warranty accrual reported as:
Current	490	484
Non-current	$ 317	$ 391

Balance Sheet Components - Defe

Balance Sheet Components - Deferred Revenue (Detail) - USD ($) $ in Thousands	Dec. 26, 2015	Dec. 27, 2014
Deferred Revenue Arrangement [Line Items]
Deferred revenue	$ 82,131	$ 55,505
Deferred service revenue
Deferred Revenue Arrangement [Line Items]
Deferred revenue	73,454	51,699
Deferred product revenue
Deferred Revenue Arrangement [Line Items]
Deferred revenue	$ 8,677	$ 3,806

Balance Sheet Components - Accu

Balance Sheet Components - Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 26, 2015	Dec. 27, 2014	Dec. 28, 2013
Net Unrealized Gains (loss)
Beginning balance	$ (94)	$ 23	$ 0
Other comprehensive income (loss), before tax	47	(117)	23
Ending balance	(47)	(94)	23
Accumulated Net Unrealized Investment Gain (Loss)
Net Unrealized Gains (loss)
Other comprehensive income (loss), before tax	$ 47	$ (117)	$ 23

Related Party Transactions - Ad

Related Party Transactions - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 26, 2015	Dec. 27, 2014	Dec. 28, 2013
Related Party Transactions [Abstract]
Cash distribution to members	$ 0	$ 500,000	$ 7,000,000
Income taxes paid on behalf of members included in distribution	0		$ 0
Gigamon LLC members’ distribution payable	$ 0

Commitments and Contingencies -

Commitments and Contingencies - Future Minimum Lease Payments Under Non-Cancelable Operating Leases (Detail) $ in Thousands	Dec. 26, 2015USD ($)
Commitments and Contingencies Disclosure [Abstract]
2,016	$ 3,763
2,017	3,360
2,018	957
2,019	82
Total	$ 8,162

Commitments and Contingencies47

Commitments and Contingencies - Additional Information (Detail) $ in Millions	Jul. 02, 2013USD ($)ft²	Dec. 26, 2015USD ($)	Dec. 27, 2014USD ($)	Dec. 28, 2013USD ($)
Commitments and Contingencies Disclosure [Abstract]
Office space lease area | ft²	105,664
Lease term	51 months
Base rent	$ 10.7
Rent expense for operating leases		$ 3.2	$ 2.9	$ 1.1
Purchase commitments with vendors		$ 12	$ 3.7

Performance Unit Plan - Additio

Performance Unit Plan - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 28, 2013	Dec. 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Accrued compensation and related payroll tax expenses	$ 20.4
Performance Unit Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Base value of performance unit plan (in dollar per unit)		$ 0.15
Number of performance unit vested	1,057,772

Performance Unit Plan Activity

Performance Unit Plan Activity (Detail) - $ / shares	12 Months Ended
	Dec. 26, 2015	Dec. 28, 2013
Weighted-Average Base Price
Weighted-Average Base Price, Cancelled
Performance Unit Plan
PUPS Available for Grant
Beginning balance		218,160
Settled		0
Cancelled		347,040
Termination of the Plan		(565,200)
Ending balance		0
Number of PUPS
Number of outstanding, Beginning Balances		1,404,812
Number of outstanding, Settled		(1,057,772)
Number of outstanding, Cancelled		(347,040)
Number of outstanding, Ending balance		0
Weighted-Average Base Price
Weighted-Average Base Price, Beginning Balances		$ 0.15
Weighted-Average Base Price, Settled		0.15
Weighted-Average Base Price, Cancelled		0.15
Weighted-Average Base Price, Termination of the Plan		$ 0.15

Preferred Stock and Stockhold50

Preferred Stock and Stockholders' Equity - Additional Information (Detail)	Oct. 28, 2013USD ($)$ / sharesshares	Jun. 17, 2013$ / sharesshares	May. 31, 2013USD ($)$ / sharesshares	Dec. 26, 2015USD ($)$ / sharesshares	Dec. 27, 2014USD ($)$ / sharesshares	Dec. 28, 2013USD ($)Vote$ / sharesshares	Dec. 31, 2012$ / shares
Schedule Of Stockholders Equity [Line Items]
Common Stock, Capital Shares Reserved for Future Issuance				8,038,872	8,194,860
Fully vested options converted to common stock			448,349
Weighted average exercise price | $ / shares			$ 0.02	$ 13.23	$ 9.71	$ 6.34
Share-based compensation Expense | $				$ 29,768,000	$ 24,658,000	$ 32,543,000
Stock-based compensation | $			$ 14,800,000	$ 12,895,000	$ 10,672,000
Reclassification from accumulated deficit to additional paid-in capital | $			$ 24,000,000
Issuance of common stock upon exercise of stock options (in shares)				523,398	790,147	344,592
Issuance of common stock upon exercise of stock options | $				$ 4,403,000	$ 5,351,000	$ 1,719,000
Preferred units authorized						8,109,848
Preferred stock conversion ratio (in USD per share) | $ / shares				$ 2.81			$ 2.81
Conversion ratio					1	1
Preferred dividend return				8.00%
Preferred stock, redemption value | $						$ 33,500,000
Preferred stock accretion | $						1,000,000
Accretion Expense | $				$ 0	$ 0	$ 100,000
Preferred stock, shares authorized				20,000,000	20,000,000
Preferred stock, par value | $ / shares				$ 0.0001	$ 0.0001
Preferred stock, shares issued				0	0
Preferred stock, shares outstanding				0	0
Common units authorized						33,333,333
Common Units Votes Per Unit | Vote						1
Common units outstanding				0
Common stock, shares authorized				1,000,000,000	1,000,000,000
Common stock, par value | $ / shares				$ 0.0001	$ 0.0001
Common Stock Votes Per Share | $ / shares				$ 1
Common stock, shares issued				34,323,457	32,641,500
Common stock, shares outstanding				34,323,457	32,641,500
Treasury stock, outstanding				8,109,848
Treasury stock, value | $				$ 12,469,000	$ 12,469,000
Treasury stock,value per share | $ / shares				$ 1.53		$ 1.35
IPO
Schedule Of Stockholders Equity [Line Items]
Share-based compensation Expense | $						$ 3,800,000
Public offering, shares amount		7,762,500
Price per share (in dollar per share) | $ / shares		$ 19
Issuance of common stock (in shares)		5,512,500
Underwriters exercise of public offering overallotment shares		1,012,500
Follow On Public Offering
Schedule Of Stockholders Equity [Line Items]
Issuance of common stock (in shares)	300,000
Stock options
Schedule Of Stockholders Equity [Line Items]
Share-based compensation Expense | $					$ 8,500,000
Common Shares
Schedule Of Stockholders Equity [Line Items]
Shares issued			16,851,635
Conversion of preferred stock to common stock (in shares)						8,110,000
Issuance of common stock upon exercise of stock options (in shares)				523,000	791,000	344,000
Common Shares | IPO
Schedule Of Stockholders Equity [Line Items]
Issuance of common stock (in shares)						5,513,000
Common Shares | Follow On Public Offering
Schedule Of Stockholders Equity [Line Items]
Issuance of common stock (in shares)						300,000
Preferred Stock
Schedule Of Stockholders Equity [Line Items]
Conversion of preferred stock to common stock (in shares)		8,100,000				(8,110,000)
2013 Equity Plan
Schedule Of Stockholders Equity [Line Items]
Common Stock, Capital Shares Reserved for Future Issuance				2,825,746
2013 Equity Plan | Restricted Stock Units (RSUs)
Schedule Of Stockholders Equity [Line Items]
Common Stock, Capital Shares Reserved for Future Issuance				1,720,390	1,533,777
2013 Equity Plan | Common Shares
Schedule Of Stockholders Equity [Line Items]
Common Stock, Capital Shares Reserved for Future Issuance				1,105,356	745,912
Stock options | Restricted Stock Units (RSUs)
Schedule Of Stockholders Equity [Line Items]
Common Stock, Capital Shares Reserved for Future Issuance				58,949	197,448
Existing Shareholders | IPO
Schedule Of Stockholders Equity [Line Items]
Public offering, shares amount		2,250,000
Existing Shareholders | Follow On Public Offering
Schedule Of Stockholders Equity [Line Items]
Public offering, shares amount	4,800,000
Price per share (in dollar per share) | $ / shares	$ 38.50
Issuance of common stock upon exercise of stock options (in shares)	293,718
Issuance of common stock upon exercise of stock options | $	$ 1,300,000
Parent Company And Existing Shareholders | Follow On Public Offering
Schedule Of Stockholders Equity [Line Items]
Public offering, shares amount	5,100,000
Price per share (in dollar per share) | $ / shares	$ 38.50

Preferred Stock and Stockhold51

Preferred Stock and Stockholders' Equity - Shares Available for Future Grants Under Option Plan (Detail) - shares	1 Months Ended	12 Months Ended
	May. 31, 2013	Dec. 26, 2015	Dec. 28, 2013	Apr. 30, 2013	Mar. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized				4,967,172
Unit Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized					3,300,505
Share-based Compensation Arrangement by Share-based Payment Award, Description		Vested options may be exercised up to ten years from the vesting commencement date, as defined in the Option Plan. Vested but unexercised options, under the Option Plan, expire 30 days after termination of employment with the Company.
Shares Avaliable for Future Grants
Beginning balance			732,267
Additional authorization			1,666,667
Options granted			1,426,849
RSUs granted			507,264
Options cancelled			64,653
RSUs cancelled			3,234
Transferred to 2013 Equity Incentive Plan upon termination			(532,708)
Ending balance			0
Vesting period		4 years
2012 Unit Option Plan, vesting percent on first anniversary		25.00%
2012 Unit Option Plan, term		10 years
2012 Unit Option Plan, expiration period after termination		30 days
2013 Equity Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized	2,929,481
Share-based Compensation Arrangement by Share-based Payment Award, Description		(i) 1,464,740 shares, (ii) 5% of the outstanding shares of common stock as of the last day of the immediately preceding fiscal year, or (iii) such other amount as determined by the Board. Vested but unexercised options, under the 2013 Equity Plan, expire three months after termination of service with the Company.
Shares Avaliable for Future Grants
2012 Unit Option Plan, expiration period after termination	3 months

Preferred Stock and Stockhold52

Preferred Stock and Stockholders' Equity - 2013 Equity Incentive Plan and ESPP (Details)	1 Months Ended		12 Months Ended
	Jun. 29, 2013Period	May. 31, 2013shares	Dec. 26, 2015USD ($)Period$ / sharesshares	Dec. 27, 2014USD ($)shares	Dec. 28, 2013USD ($)shares	Apr. 30, 2013shares
2013 Equity Incentive Plan [Abstract]
Number of shares authorized						4,967,172
Outstanding awards			8,038,872	8,194,860
Employee Stock Purchase Plan [Abstract]
Share-based compensation Expense | $			$ 29,768,000	$ 24,658,000	$ 32,543,000
Employee Stock
2013 Equity Incentive Plan [Abstract]
Number of shares authorized					439,422
Outstanding awards			332,351	420,517
Employee Stock Purchase Plan [Abstract]
Number of additional shares authorized under ESPP					439,422
Employee Stock Ownership Plan (ESOP), Plan Description			The ESPP provides for a 24-month offering period comprised of four purchase periods of approximately six months. Employees are able to purchase shares at 85% of the lower of the market value of the Company's common stock (i) at the date of commencement of the offering period or (ii) at the last day of the purchase period.
Eligible compensation to purchase shares through ESPP, maximum			15.00%
Discount from market value on purchase of shares through ESPP			85.00%
Offering period, ESPP			24 months
Number of purchase periods | Period	4		2
Term of purchase periods	6 months
Share-based compensation Expense | $			$ 2,700,000	$ 4,200,000	$ 4,700,000
Shares issued in period			527,588
Weighted average price (in USD per share) | $ / shares			$ 9.77
Stock options
Employee Stock Purchase Plan [Abstract]
Share-based compensation Expense | $				8,500,000
Fully Vested Options
Employee Stock Purchase Plan [Abstract]
Share-based compensation Expense | $					8,500,000
Grant Date April 2012 | Performance Shares
Employee Stock Purchase Plan [Abstract]
Share-based compensation Expense | $			$ 51,000	$ 40,000	134,400
IPO
Employee Stock Purchase Plan [Abstract]
Share-based compensation Expense | $					$ 3,800,000
2013 Equity Plan
2013 Equity Incentive Plan [Abstract]
Number of shares authorized		2,929,481
Shares authorized upon termination of awards		4,967,172
Annual increase in common shares authorized		1,464,740
Annual percent increase in common shares authorized		5.00%
Expiration period after termination of employment		3 months
Outstanding awards			2,825,746
2013 Equity Plan | Common Shares
2013 Equity Incentive Plan [Abstract]
Outstanding awards			1,105,356	745,912
2013 Equity Plan | Restricted Stock Units (RSUs)
2013 Equity Incentive Plan [Abstract]
Outstanding awards			1,720,390	1,533,777
2012 Equity Incentive Plan
2013 Equity Incentive Plan [Abstract]
Outstanding awards			1,127,757
Stock options | Restricted Stock Units (RSUs)
2013 Equity Incentive Plan [Abstract]
Outstanding awards			58,949	197,448

Preferred Stock and Stockhold53

Preferred Stock and Stockholders' Equity - Stock Option Activity (Detail) - USD ($)	Apr. 30, 2013	May. 31, 2013	Dec. 26, 2015	Dec. 27, 2014	Dec. 28, 2013	Dec. 31, 2012	Dec. 26, 2015	Dec. 27, 2014	Dec. 28, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted			408,000	646,444	1,604,847
Share-based compensation Expense			$ (29,768,000)	$ (24,658,000)	$ (32,543,000)
Shares outstanding			2,379,968	3,367,637	2,402,398	2,402,398	2,170,720	2,379,968	3,367,637	2,402,398
Weighted-average exercise price, exercisable		$ 0.02					$ 13.23	$ 9.71	$ 6.34
Reversal of net compensation expense				$ 400,000
Number of Stock Options Outstanding
Number of stock options outstanding, beginning of period			2,379,968	3,367,637	2,402,398
Number of stock options outstanding, granted			408,000	646,444	1,604,847
Number of stock options outstanding, Options exercised			(523,398)	(790,147)	(344,592)
Number of stock options outstanding, cancelled			(93,850)	(843,966)	(295,016)
Number of stock options outstanding, end of period			2,170,720	2,379,968	3,367,637	2,402,398
Number of stock options outstanding, vested and expected to vest							2,066,613	2,230,425	3,216,818
Number of stock options outstanding, exercisable							1,114,119	936,061	972,268
Weighted-average exercise price per award, Weighted - Average Exercise Price
Weighted-average exercise price, beginning of period			$ 12.91	$ 9.77	$ 7.92
Weighted-average exercise price, options granted			21.44	20.21	11.34
Weighted-average exercise price, options exercised			8.42	6.73	4.99
Weighted-average exercise price, options cancelled			9.76	11.75	8.85
Weighted-average exercise price, end of period			$ 15.73	$ 12.91	$ 9.77	$ 7.92
Weighted-average exercise price, vested and expected to vest							$ 15.55	$ 12.71	$ 9.68
Weighted-average exercise price, exercisable		$ 0.02					$ 13.23	$ 9.71	$ 6.34
Weighted-average remaining contractual life (years)
Weighted average remaining contractual life			7 years 1 month 20 days	7 years 6 months	8 years 9 months 11 days	9 years 4 months 24 days
Weighted average remaining contractual life, vested and expected to vest			7 years 1 month 20 days	8 years 2 months 1 day	8 years 7 months 20 days
Weighted average remaining contractual life, exercisable			7 years 2 months 12 days	7 years 10 months 6 days	8 years 7 months 24 days
Aggregate Intrinsic Value
Aggregate intrinsic value							$ 24,910,000	$ 14,368,000	$ 62,725,000	$ 12,527,000
Aggregate intrinsic value, vested and expected to vest							24,088,000	13,754,000	60,034,000
Aggregate intrinsic value, exercisable							15,536,000	7,643,000	21,344,000
Terminated Executive
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation Expense				$ 300,000
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Description			Vested options may be exercised up to ten years from the vesting commencement date.
Shares granted						1,143,413
Share-based compensation Expense				$ (8,500,000)
Unrecognized compensation expense							$ 3,300,000	$ 5,100,000	$ 10,300,000
Accelerated vesting (shares)				31,211
Number of shares affected by modification				10,666
Number of Stock Options Outstanding
Number of stock options outstanding, granted						1,143,413
Fully Vested Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted					448,349
Share-based compensation Expense					$ (8,500,000)
Weighted-average exercise price, exercisable									$ 0.02
Number of Stock Options Outstanding
Number of stock options outstanding, granted					448,349
Weighted-average exercise price per award, Weighted - Average Exercise Price
Weighted-average exercise price, exercisable									$ 0.02
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number							1,779,339	1,733,225	840,949	149,841
Unrecognized compensation expense							$ 18,200,000	$ 16,200,000	$ 10,900,000
Share Price (in dollar per share)							$ 26.82	$ 17.47	$ 28.29
Accelerated vesting (shares)				9,347
2013 Equity Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Description			(i) 1,464,740 shares, (ii) 5% of the outstanding shares of common stock as of the last day of the immediately preceding fiscal year, or (iii) such other amount as determined by the Board. Vested but unexercised options, under the 2013 Equity Plan, expire three months after termination of service with the Company.
Shares authorized upon termination of awards		4,967,172
Expiration period after termination of employment		3 months
2013 Equity Plan | Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		4 years
Vesting percent on first anniversary		25.00%
Equity plan term		10 years
Vesting period after termination of employment		3 months
2012 Equity Incentive Plan | Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period after termination of employment	30 days
Grant Date April 2012 | Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number							2,611	20,135
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number								9,830
Shares granted						66,663
Share-based compensation Expense			$ (51,000)	$ (40,000)	$ (134,400)
Number of Stock Options Outstanding
Number of stock options outstanding, granted						66,663
IPO
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation Expense					$ (3,800,000)

Preferred Stock and Stockhold54

Preferred Stock and Stockholders' Equity - Outstanding Stock Options and Vested and Exercisable Stock Options (Detail)	12 Months Ended
	Dec. 26, 2015$ / sharesshares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Stock Options Outstanding | shares	2,170,720
Weighted- Average Remaining Contractual Life (Years)	7 years 1 month 6 days
Weighted- Average Exercise Price per Share (in dollar per share)	$ 15.73
Shares Subject to Stock Options | shares	1,114,119
Weighted- Average Exercise Price per Share	$ 13.23
$0.00 - $10.85
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Stock Options Outstanding | shares	508,423
Weighted- Average Remaining Contractual Life (Years)	6 years 10 months 24 days
Weighted- Average Exercise Price per Share (in dollar per share)	$ 6.32
Shares Subject to Stock Options | shares	355,089
Weighted- Average Exercise Price per Share	$ 5.31
Exercise Prices, Lower limit	0
Exercise Prices, Upper limit	$ 10.85
$11.02 - $13.11
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Stock Options Outstanding | shares	523,706
Weighted- Average Remaining Contractual Life (Years)	7 years 1 month 6 days
Weighted- Average Exercise Price per Share (in dollar per share)	$ 12.26
Shares Subject to Stock Options | shares	353,950
Weighted- Average Exercise Price per Share	$ 12.33
Exercise Prices, Lower limit	11.02
Exercise Prices, Upper limit	$ 13.11
$14.70 - $19.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Stock Options Outstanding | shares	477,619
Weighted- Average Remaining Contractual Life (Years)	7 years 9 months 18 days
Weighted- Average Exercise Price per Share (in dollar per share)	$ 17.05
Shares Subject to Stock Options | shares	284,017
Weighted- Average Exercise Price per Share	$ 17.07
Exercise Prices, Lower limit	14.70
Exercise Prices, Upper limit	$ 19
$21.44 - $29.36
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Stock Options Outstanding | shares	446,000
Weighted- Average Remaining Contractual Life (Years)	6 years 3 months 18 days
Weighted- Average Exercise Price per Share (in dollar per share)	$ 22.11
Shares Subject to Stock Options | shares	19,791
Weighted- Average Exercise Price per Share	$ 29.36
Exercise Prices, Lower limit	21.44
Exercise Prices, Upper limit	$ 29.36
$29.47 - $30.51
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Stock Options Outstanding | shares	214,972
Weighted- Average Remaining Contractual Life (Years)	8 years 1 month 6 days
Weighted- Average Exercise Price per Share (in dollar per share)	$ 30.27
Shares Subject to Stock Options | shares	101,272
Weighted- Average Exercise Price per Share	$ 30.23
Exercise Prices, Lower limit	29.47
Exercise Prices, Upper limit	$ 30.51

Preferred Stock and Stockhold55

Preferred Stock and Stockholders' Equity - Restricted Stock Units Activity (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 26, 2015	Dec. 27, 2014	Dec. 28, 2013	Dec. 31, 2012
Weighted-Average Grant Date Fair Value
Weighted-average grant date fair value, vested (in dollar per share)
Weighted-average grant date fair value, cancelled (in dollar per share)
Aggregate Intrinsic Value
Share-based compensation Expense	$ 29,768	$ 24,658	$ 32,543
Restricted Stock Units (RSUs)
Number of RSUs Outstanding
Number of outstanding, Beginning Balances	1,733,225	840,949	149,841
Number of outstanding, granted	1,364,465	1,668,228	764,509
Number of outstanding, vested	(1,010,609)	(397,239)	(50,849)
Number of outstanding, cancelled	(307,742)	(378,713)	(22,552)
Number of outstanding, Ending balance	1,779,339	1,733,225	840,949	149,841
Number of outstanding, vested and expected to vest	1,510,440	1,521,264	783,633
Weighted-Average Grant Date Fair Value
Weighted-Average Base Price, Beginning Balances	$ 18.79	$ 21	$ 11.12
Weighted-average grant date fair value, granted (in dollar per share)		19.58	22.13
Weighted-average grant date fair value, vested (in dollar per share)		21.18	11.06
Weighted-average grant date fair value, cancelled (in dollar per share)		24.64	16.16
Weighted-Average Base Price, Ending Balances	$ 22.64	18.79	21	$ 11.12
Weighted-average grant date fair value, vested and expected to vest (in dollar per share)	$ 22.53	$ 18.66	$ 20.89
Weighted-Average Remaining Contractual Life (Years)
Weighted-average remaining contractual life	1 year 6 months 10 days	1 year 3 months 7 days	1 year 4 months 24 days	1 year 11 months 23 days
Weighted-average remaining contractual life, vested and expected to vest	1 year 5 months 4 days	1 year 2 months 4 days	1 year 4 months 6 days
Aggregate Intrinsic Value
Aggregate intrinsic value	$ 47,722	$ 30,245	$ 23,790	$ 1,965
Aggregate intrinsic value, vested and expected to vest	$ 40,510	$ 26,580	$ 22,169
Share Price (in dollar per share)	$ 26.82	$ 17.47	$ 28.29
Minimum | Restricted Stock Units (RSUs)
Reconciliation of Restricted Stock Activity [Line Items]
Vesting period	1 year
Weighted-Average Grant Date Fair Value
Weighted-average grant date fair value, granted (in dollar per share)	$ 16.31
Maximum | Restricted Stock Units (RSUs)
Reconciliation of Restricted Stock Activity [Line Items]
Vesting period	4 years
Weighted-Average Grant Date Fair Value
Weighted-average grant date fair value, granted (in dollar per share)	$ 33.95

Preferred Stock and Stockhold56

Preferred Stock and Stockholders' Equity - Stock-Based Compensation Expense (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 26, 2015	Dec. 27, 2014	Dec. 28, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Shares outstanding	2,170,720	2,379,968	3,367,637	2,402,398
Share-based compensation Expense	$ 29,768	$ 24,658	$ 32,543
Cost of Sales
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Share-based compensation Expense	1,872	1,679	3,496
Research and Development Expense
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Share-based compensation Expense	9,126	8,102	11,467
Selling and Marketing Expense
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Share-based compensation Expense	9,466	8,212	11,034
General and Administrative Expense
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Share-based compensation Expense	$ 9,304	$ 6,665	$ 6,546
Stock options
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Expected term (in years)	4 years 7 months 6 days
Risk-free interest rate	1.60%
Expected volatility	56.04%
Expected dividend rate	0.00%	0.00%	0.00%
Grant date fair value per award, stock options (in dollar per share)	$ 10.11
Unrecognized compensation expense	$ 3,300	$ 5,100	$ 10,300
Weighted average remaining amortization period	1 year	1 year 1 month 6 days	1 year 4 months 24 days
Share-based compensation Expense		$ 8,500
Stock options | Minimum
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Expected term (in years)		5 years 3 months 7 days	5 years
Risk-free interest rate		1.70%	0.89%
Expected volatility		58.90%	62.10%
Grant date fair value per award, stock options (in dollar per share)		$ 5.94	$ 9.44
Stock options | Maximum
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Expected term (in years)		6 years 29 days	6 years 29 days
Risk-free interest rate		1.90%	1.84%
Expected volatility		61.90%	65.30%
Grant date fair value per award, stock options (in dollar per share)		$ 17.67	$ 23.29
Employee Stock
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Expected dividend rate	0.00%	0.00%	0.00%
Unrecognized compensation expense	$ 1,400	$ 3,500	$ 5,100
Weighted average remaining amortization period	10 months 24 days	8 months 12 days	10 months 24 days
Share-based compensation Expense	$ 2,700	$ 4,200	$ 4,700
Employee Stock | Minimum
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Expected term (in years)	6 years	6 months	8 months 4 days
Risk-free interest rate	0.07%	0.05%	0.08%
Expected volatility	3.76%	53.10%	53.60%
Grant date fair value per share, ESPP (in dollar per share)	$ 5.48	$ 3.48	$ 12.11
Employee Stock | Maximum
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Expected term (in years)	2 years	2 years	2 years 2 months 4 days
Risk-free interest rate	0.72%	0.42%	0.20%
Expected volatility	59.90%	63.10%	63.10%
Grant date fair value per share, ESPP (in dollar per share)	$ 12.64	$ 13.06	$ 15.68
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Number of outstanding, granted	1,364,465	1,668,228	764,509
Weighted-average grant date fair value, granted (in dollar per share)		$ 19.58	$ 22.13
Unrecognized compensation expense	$ 18,200	$ 16,200	$ 10,900
Weighted average remaining amortization period	1 year 6 months	1 year 3 months 18 days	1 year 4 months 24 days
Restricted Stock Units (RSUs) | Grant Date Fair Value Range One
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Number of outstanding, granted		1,668,228
Weighted-average grant date fair value, granted (in dollar per share)		$ 10.75
Restricted Stock Units (RSUs) | Grant Date Fair Value Range Two
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Weighted-average grant date fair value, granted (in dollar per share)		$ 34.26
Restricted Stock Units (RSUs) | Minimum
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Weighted-average grant date fair value, granted (in dollar per share)	$ 16.31
Restricted Stock Units (RSUs) | Maximum
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Weighted-average grant date fair value, granted (in dollar per share)	$ 33.95
Inventories
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Capitalized stock compensation costs	$ 100	$ 200
Fiscal 2012 Grants, Tranche One | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Number of outstanding, granted			764,509
Fiscal 2012 Grants, Tranche One | Restricted Stock Units (RSUs) | Minimum
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Weighted-average grant date fair value, granted (in dollar per share)			$ 15.57
Fiscal 2012 Grants, Tranche Two | Restricted Stock Units (RSUs) | Minimum
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Weighted-average grant date fair value, granted (in dollar per share)			$ 38.33

Preferred Stock and Stockhold57

Preferred Stock and Stockholders' Equity - Common Units/Stock Reserved For Future Issuance (Detail) - shares	Dec. 26, 2015	Dec. 27, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding awards	8,038,872	8,194,860
Employee Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding awards	332,351	420,517
Option Plans Awards To Purchase Common Stock [Member] | Common units/stock subject to options outstanding
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding awards	1,068,808	1,640,500
Stock options | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding awards	58,949	197,448
Stock options | Shares Available For Grant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding awards	0	0
2013 Equity Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding awards	2,825,746
2013 Equity Plan | Common units/stock subject to options outstanding
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding awards	1,105,356	745,912
2013 Equity Plan | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding awards	1,720,390	1,533,777
2013 Equity Plan | Shares Available For Grant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding awards	3,753,018	3,656,706

Defined Contribution Plans - Ad

Defined Contribution Plans - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 26, 2015	Dec. 27, 2014	Dec. 28, 2013
Postemployment Benefits [Abstract]
Maximum percentage of employer's matching contribution to 401(k)	50.00%
Maximum percentage of employee contribution to 401(k)	3.00%
Maximum employee contribution to 401(k)	$ 7,950	$ 7,650	$ 7,500
Contributions to 401(k) defined contribution plan	$ 1,800,000	$ 2,000,000	$ 1,600,000

Income Tax - Additional Informa

Income Tax - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 26, 2015	Dec. 27, 2014	Dec. 28, 2013
Income Tax Disclosure [Line Items]
Excess tax benefits from stock options	$ 4,706	$ 0	$ 0
Unrecognized tax benefits, increase	1,000
Undistributed earnings in foreign subsidiaries	2,700
Federal
Income Tax Disclosure [Line Items]
Net operating loss carryforwards	6,600
Excess tax benefits from stock options	6,600
Federal | Research Tax Credit Carryforward
Income Tax Disclosure [Line Items]
Tax credit carryforwards	1,100
State
Income Tax Disclosure [Line Items]
Net operating loss carryforwards	1,100
Excess tax benefits from stock options	1,100
State | Research Tax Credit Carryforward
Income Tax Disclosure [Line Items]
Tax credit carryforwards	$ 4,100

Income Tax - Components of (Los

Income Tax - Components of (Loss) Income Before Income Tax Benefit (Provision) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 26, 2015	Dec. 27, 2014	Dec. 28, 2013
Income Tax Disclosure [Abstract]
United States	$ 10,326	$ (20,682)	$ (31,024)
Foreign	1,538	1,026	824
Total	$ 11,864	$ (19,656)	$ (30,200)

Income Tax - Components of Inco

Income Tax - Components of Income Tax Benefit (Provision) (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 26, 2015	Sep. 26, 2015	Jun. 27, 2015	Mar. 28, 2015	Dec. 27, 2014	Sep. 27, 2014	Jun. 28, 2014	Mar. 29, 2014	Dec. 26, 2015	Dec. 27, 2014	Dec. 28, 2013
Federal:
Current									$ (4,162)	$ 0	$ 0
Deferred									0	(19,504)	19,504
State:
Current									(926)	(24)	(10)
Deferred									0	(1,373)	1,373
Foreign:
Current									(661)	(285)	(216)
Deferred									71	52	12
Total income tax (provision) benefit	$ (5,418)	$ (73)	$ (99)	$ (88)	$ (41)	$ (66)	$ (24,727)	$ 3,700	$ (5,678)	$ (21,134)	$ 20,663

Income Tax - Difference Between

Income Tax - Difference Between Income Taxes Computed at Federal Statutory Rate and Income Tax Benefit (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 26, 2015	Sep. 26, 2015	Jun. 27, 2015	Mar. 28, 2015	Dec. 27, 2014	Sep. 27, 2014	Jun. 28, 2014	Mar. 29, 2014	Dec. 26, 2015	Dec. 27, 2014	Dec. 28, 2013
Income Tax Disclosure [Abstract]
Federal statutory rate									35.00%	35.00%	35.00%
Effect of:
Tax (provision) benefit at federal statutory rate									$ (4,153)	$ 6,881	$ 10,570
State tax (provision) benefit, net of federal tax (provision) benefit									(405)	515	376
ESPP									(723)	(1,106)	(1,760)
Other permanent items									(305)	(215)	(281)
Impact of foreign operations									(8)	132	37
Tax credits									3,205	2,106	240
LLC income flow-through									0	0	(3,319)
Recognition of deferred tax assets									0	0	14,800
Change in valuation allowance									(3,289)	(29,447)	0
Total income tax (provision) benefit	$ (5,418)	$ (73)	$ (99)	$ (88)	$ (41)	$ (66)	$ (24,727)	$ 3,700	$ (5,678)	$ (21,134)	$ 20,663

Income Tax - Components of Defe

Income Tax - Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 26, 2015	Dec. 27, 2014	Dec. 28, 2013	May. 31, 2013
Deferred tax assets:
Stock-based compensation	$ 12,895	$ 10,672		$ 14,800
Fixed assets	3,938	4,272
Net operating loss	0	432
Accruals and reserves	6,750	4,761
Deferred revenue	4,895	3,896
Inventory reserve	971	1,231
Credits	3,825	2,651
Gross deferred tax assets	33,274	27,915
Valuation allowance	33,139	27,851
Total deferred tax assets	135	64
Deferred tax liabilities	0	0
Total	135	64
Valuation Allowance of Deferred Tax Assets
Valuation Allowance [Abstract]
Balance at the beginning of period	27,851	0	$ 0
Additions	5,288	27,851	0
Balance at End of Period	$ 33,139	$ 27,851	$ 0

Income Tax - Reconciliation of

Income Tax - Reconciliation of Gross Unrecognized Tax Benefit (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 26, 2015	Dec. 27, 2014	Dec. 28, 2013
Income Tax Disclosure [Abstract]
Unrecognized tax benefits	$ 2,258	$ 186	$ 186
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits at the beginning of the period	2,258	186
Additions for tax positions related to the current year	1,424	1,824	186
Additions for tax positions related to the prior year	112	248	0
Reductions for tax positions related to the prior year	(547)	0	0
Unrecognized tax benefits at the end of the period	$ 3,247	$ 2,258	$ 186

Net Income (Loss) per Share - A

Net Income (Loss) per Share - Additional information (Detail)	May. 20, 2013
Earnings Per Share [Abstract]
Stock split conversion ratio	0.33333333333

Net Income (Loss) per Share - C

Net Income (Loss) per Share - Computation of Basic and Diluted Net Income (Loss) Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 26, 2015	Sep. 26, 2015	Jun. 27, 2015	Mar. 28, 2015	Dec. 27, 2014	Sep. 27, 2014	Jun. 28, 2014	Mar. 29, 2014	Dec. 26, 2015	Dec. 27, 2014	Dec. 28, 2013
Numerator:
Net income (loss) attributable to common stockholders									$ 6,186	$ (40,790)	$ (9,518)
Denominator:
Weighted average shares used for basic net (loss) income per share computation									33,618	32,200	24,722
Weighted average effect of dilutive securities:
Stock options									2,248	0	0
Weighted average shares used for diluted net (loss) income per share computation									35,866	32,200	24,722
Net (loss) income per share attributable to common stockholders :
Basic (in dollars per share)	$ 0.07	$ 0.13	$ 0	$ (0.02)	$ 0.09	$ (0.09)	$ (1.01)	$ (0.26)	$ 0.18	$ (1.27)	$ (0.39)
Diluted (in dollars per share)	$ 0.07	$ 0.12	$ 0	$ (0.02)	$ 0.09	$ (0.09)	$ (1.01)	$ (0.26)	$ 0.17	$ (1.27)	$ (0.39)

Net Income (Loss) per Share - P

Net Income (Loss) per Share - Potentially Dilutive Securities Excluded from Computation of Diluted Net Income (Loss) Per Common Stock (Detail) - shares shares in Thousands	12 Months Ended
	Dec. 26, 2015	Dec. 27, 2014	Dec. 28, 2013
Option Plans Awards To Purchase Common Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of diluted net income per unit	654	6,339	5,073

Segment Information - Additiona

Segment Information - Additional Information (Detail)	12 Months Ended
	Dec. 26, 2015Segment
Segment Reporting [Abstract]
Number of segments	1

Segment Information - Revenue a

Segment Information - Revenue and Long-Lived Assets by Geographic Region (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 26, 2015	Sep. 26, 2015	Jun. 27, 2015	Mar. 28, 2015	Dec. 27, 2014	Sep. 27, 2014	Jun. 28, 2014	Mar. 29, 2014	Dec. 26, 2015	Dec. 27, 2014	Dec. 28, 2013
Segment Reporting Revenue Reconciling Item [Line Items]
Total revenue	$ 67,024	$ 56,652	$ 51,446	$ 46,853	$ 51,251	$ 39,268	$ 34,851	$ 31,760	$ 221,975	$ 157,130	$ 140,295
Long-lived assets	9,416				7,387				9,416	7,387
United States
Segment Reporting Revenue Reconciling Item [Line Items]
Total revenue									163,283	116,921	103,257
Long-lived assets	9,148				7,218				9,148	7,218
Rest of Americas
Segment Reporting Revenue Reconciling Item [Line Items]
Total revenue									10,696	8,499	5,846
Europe, Middle East and Africa
Segment Reporting Revenue Reconciling Item [Line Items]
Total revenue									32,167	21,769	19,753
Asia Pacific
Segment Reporting Revenue Reconciling Item [Line Items]
Total revenue									15,829	9,941	$ 11,439
Other
Segment Reporting Revenue Reconciling Item [Line Items]
Long-lived assets	$ 268				$ 169				$ 268	$ 169

Supplementary Quarterly Finan70

Supplementary Quarterly Financial Data (Unaudited) - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 26, 2015	Sep. 26, 2015	Jun. 27, 2015	Mar. 28, 2015	Dec. 27, 2014	Sep. 27, 2014	Jun. 28, 2014	Mar. 29, 2014	Dec. 26, 2015	Dec. 27, 2014	Dec. 28, 2013
Revenue:
Product	$ 47,051	$ 38,717	$ 34,814	$ 32,152	$ 36,790	$ 26,180	$ 22,544	$ 20,080	$ 152,734	$ 105,594	$ 101,717
Service	19,973	17,935	16,632	14,701	14,461	13,088	12,307	11,680	69,241	51,536	38,578
Total revenue	67,024	56,652	51,446	46,853	51,251	39,268	34,851	31,760	221,975	157,130	140,295
Cost of revenue:
Product	10,262	9,613	9,558	9,445	10,319	7,396	6,281	7,005	38,878	31,001	26,103
Service	1,669	1,708	1,763	1,777	1,722	1,601	1,544	1,580	6,917	6,447	4,727
Total cost of revenue	11,931	11,321	11,321	11,222	12,041	8,997	7,825	8,585	45,795	37,448	30,830
Gross profit	55,093	45,331	40,125	35,631	39,210	30,271	27,026	23,175	176,180	119,682	109,465
Research and development	13,171	12,677	12,227	11,496	10,922	10,086	10,860	10,938	49,571	42,806	42,067
Sales and marketing	26,150	21,388	21,171	18,832	20,387	17,948	19,558	18,170	87,541	76,063	72,024
General and administrative	7,788	6,950	6,702	6,019	5,015	5,217	4,446	6,005	27,459	20,683	25,575
Total operating expenses	47,109	41,015	40,100	36,347	36,324	33,251	34,864	35,113	164,571	139,552	139,666
Income (loss) from operations	7,984	4,316	25	(716)	2,886	(2,980)	(7,838)	(11,938)	11,609	(19,870)	(30,201)
Interest income	116	106	105	119	92	82	73	61	446	308	95
Other expense, net	(119)	(69)	7	(10)	(31)	(28)	6	(41)	(191)	(94)	(94)
Income (loss) before income tax (provision) benefit	7,981	4,353	137	(607)	2,947	(2,926)	(7,759)	(11,918)	11,864	(19,656)	(30,200)
Income tax (provision) benefit	(5,418)	(73)	(99)	(88)	(41)	(66)	(24,727)	3,700	(5,678)	(21,134)	20,663
Net Income (loss)	$ 2,563	$ 4,280	$ 38	$ (695)	$ 2,906	$ (2,992)	$ (32,486)	$ (8,218)	6,186	(40,790)	(9,537)
Accretion of preferred stock to redemption value and issuance costs									0	0	(1,088)
Earnings distributable to preferred stockholders									0	0	1,107
Net income (loss) attributable to common stockholders									$ 6,186	$ (40,790)	$ (9,518)
Net (loss) income per share attributable to common stockholders :
Basic (in dollars per share)	$ 0.07	$ 0.13	$ 0	$ (0.02)	$ 0.09	$ (0.09)	$ (1.01)	$ (0.26)	$ 0.18	$ (1.27)	$ (0.39)
Diluted (in dollars per share)	$ 0.07	$ 0.12	$ 0	$ (0.02)	$ 0.09	$ (0.09)	$ (1.01)	$ (0.26)	$ 0.17	$ (1.27)	$ (0.39)