Gigamon (GIMO) 10-K 24 Feb 17 2016 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Jul. 02, 2016
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2016
Document Fiscal Year Focus	2,016
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	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding	36,689,343
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Common Stock, Shares Outstanding		$ 1,263.8

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 26, 2015
CURRENT ASSETS:
Cash and cash equivalents	$ 148,926	$ 120,212
Short-term investments	109,238	90,001
Accounts receivable, net of allowance for doubtful accounts and sales returns of $979 and $601 as of December 31, 2016 and December 26, 2015, respectively	75,522	47,655
Inventories	11,347	3,813
Prepaid expenses and other current assets	9,909	7,621
Total current assets	354,942	269,302
Property and equipment, net	11,809	9,416
Deferred tax assets	33,094	135
Other assets, non-current	1,154	766
TOTAL ASSETS	400,999	279,619
CURRENT LIABILITIES:
Accounts payable	5,208	3,724
Accrued liabilities	34,649	37,042
Deferred revenue	68,997	62,248
Total current liabilities	108,854	103,014
Deferred revenue, non current	28,785	19,883
Deferred and other tax liabilities	201	279
Other liabilities, non-current	499	1,087
TOTAL LIABILITIES	138,339	124,263
Commitments and Contingencies
STOCKHOLDERS’ EQUITY
Preferred stock—$0.0001 par value; 20,000 shares authorized, no shares issued or outstanding as of December 31, 2016 and December 26, 2015	0	0
Common stock—$0.0001 par value; 1,000,000 shares authorized, 36,303 and 34,323 shares issued and outstanding as of December 31, 2016 and December 26, 2015, respectively	4	3
Treasury stock—No par value; no shares authorized and outstanding as of December 31, 2016 and 8,110 shares authorized and outstanding as of December 26, 2015	0	(12,469)
Additional paid-in capital	256,774	211,402
Accumulated other comprehensive loss	(17)	(47)
Retained earnings (accumulated deficit)	5,899	(43,533)
TOTAL STOCKHOLDERS’ EQUITY	262,660	155,356
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$ 400,999	$ 279,619

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 26, 2015
Allowance for Doubtful Accounts Receivable, Current	$ 979	$ 601
Preferred stock, par value (in usd per share)	$ 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 (in usd per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized	1,000,000,000	1,000,000,000
Common stock, shares, issued	36,303,219	34,323,457
Common Stock, Shares, Outstanding	36,303,219	34,323,457
Treasury stock, shares	0	8,109,848

Statement of Income

Statement of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Oct. 01, 2016	Jul. 02, 2016	Apr. 02, 2016	Dec. 26, 2015	Sep. 26, 2015	Jun. 27, 2015	Mar. 28, 2015	Dec. 31, 2016	Dec. 26, 2015	Dec. 27, 2014
Revenue:
Product	$ 59,430	$ 59,835	$ 51,308	$ 44,662	$ 47,051	$ 38,717	$ 34,814	$ 32,152	$ 215,235	$ 152,734	$ 105,594
Service	25,599	23,677	23,795	22,549	19,973	17,935	16,632	14,701	95,620	69,241	51,536
Total revenue	85,029	83,512	75,103	67,211	67,024	56,652	51,446	46,853	310,855	221,975	157,130
Cost of revenue:
Product	11,615	12,197	11,510	10,707	10,262	9,613	9,558	9,445	46,029	38,878	31,001
Service	2,210	2,141	2,339	2,082	1,669	1,708	1,763	1,777	8,772	6,917	6,447
Total cost of revenue	13,825	14,338	13,849	12,789	11,931	11,321	11,321	11,222	54,801	45,795	37,448
Gross profit	71,204	69,174	61,254	54,422	55,093	45,331	40,125	35,631	256,054	176,180	119,682
Operating expenses:
Research and development	17,170	18,306	17,250	15,358	13,171	12,677	12,227	11,496	68,084	49,571	42,806
Sales and marketing	34,167	31,994	28,843	27,657	26,150	21,388	21,171	18,832	122,661	87,541	76,063
General and administrative	8,869	8,887	9,147	7,995	7,788	6,950	6,702	6,019	34,898	27,459	20,683
Total operating expenses	60,206	59,187	55,240	51,010	47,109	41,015	40,100	36,347	225,643	164,571	139,552
Income (loss) from operations	10,998	9,987	6,014	3,412	7,984	4,316	25	(716)	30,411	11,609	(19,870)
Interest income	265	235	219	207	116	106	105	119	926	446	308
Other expense, net	(305)	(144)	(173)	(69)	(119)	(69)	7	(10)	(691)	(191)	(94)
Income (loss) before income tax benefit (provision)	10,958	10,078	6,060	3,550	7,981	4,353	137	(607)	30,646	11,864	(19,656)
Income tax benefit (provision)	(4,535)	(3,999)	27,899	(579)	(5,418)	(73)	(99)	(88)	18,786	(5,678)	(21,134)
Net Income (loss)	$ 6,423	$ 6,079	$ 33,959	$ 2,971	$ 2,563	$ 4,280	$ 38	$ (695)	$ 49,432	$ 6,186	$ (40,790)
Net income (loss) per share:
Basic (in usd per share)	$ 0.18	$ 0.17	$ 0.97	$ 0.09	$ 0.07	$ 0.13	$ 0	$ (0.02)	$ 1.40	$ 0.18	$ (1.27)
Diluted (in usd per share)	$ 0.17	$ 0.16	$ 0.91	$ 0.08	$ 0.07	$ 0.12	$ 0	$ (0.02)	$ 1.31	$ 0.17	$ (1.27)
Weighted average shares used in computing net income (loss) per share:
Weighted average shares used for basic net income (loss) per share computation									35,431	33,618	32,200
Weighted average shares used for diluted net income (loss) per share computation									37,643	35,866	32,200

Statement of Comprehensive Inco

Statement of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 26, 2015	Dec. 27, 2014
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 49,432	$ 6,186	$ (40,790)
Other comprehensive income (loss):
Change in unrealized gain (loss) on available-for-sale investments	30	47	(117)
Comprehensive income (loss)	$ 49,462	$ 6,233	$ (40,907)

Statement of Shareholders' Equi

Statement of Shareholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Treasury Stock	Additional Paid-In Capital	Accumulated Other Comprehensive (Loss) Income	Retained Earnings/Accumulated Deficit
Beginning Balance (in shares) at Dec. 28, 2013		31,152
Beginning Balance at Dec. 28, 2013	$ 123,438	$ 3	$ (12,469)	$ 144,810	$ 23	$ (8,929)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense	24,800	$ 0	0	24,800	0	0
Issuance of common stock upon exercise of stock options (in shares)		791
Issuance of common stock upon exercise of stock options	5,351	$ 0	0	5,351	0	0
Issuance of common stock related to employee stock purchase plan (in shares)		458
Issuance of common stock related to employee stock purchase plan	5,878	$ 0	0	5,878	0	0
Issuance of common stock upon vesting of RSUs (in shares)		397
Issuance of common stock upon vesting of RSUs	0	$ 0	0	0	0	0
Shares repurchased for tax withholdings on vesting of RSUs (in shares)		(156)
Shares repurchased for tax withholdings on vesting of RSUs	(3,125)	$ 0	0	(3,125)	0	0
Net income (loss)	(40,790)	0	0	0	0	(40,790)
Other comprehensive income (loss)	(117)	$ 0	0	0	(117)	0
Ending Balance (in shares) at Dec. 27, 2014		32,642
Ending Balance at Dec. 27, 2014	115,435	$ 3	(12,469)	177,714	(94)	(49,719)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense	29,663	$ 0	0	29,663	0	0
Issuance of common stock upon exercise of stock options (in shares)		523
Issuance of common stock upon exercise of stock options	4,403	$ 0	0	4,403	0	0
Issuance of common stock related to employee stock purchase plan (in shares)		527
Issuance of common stock related to employee stock purchase plan	5,099	$ 0	0	5,099	0	0
Issuance of common stock upon vesting of RSUs (in shares)		1,011
Issuance of common stock upon vesting of RSUs	0	$ 0	0	0	0	0
Shares repurchased for tax withholdings on vesting of RSUs (in shares)		(380)
Shares repurchased for tax withholdings on vesting of RSUs	(10,183)	$ 0	0	(10,183)	0	0
Excess tax benefit from employee stock-based compensation plans	4,706	0	0	4,706	0	0
Net income (loss)	6,186	0	0	0	0	6,186
Other comprehensive income (loss)	47	$ 0	0	0	47	0
Ending Balance (in shares) at Dec. 26, 2015		34,323
Ending Balance at Dec. 26, 2015	155,356	$ 3	(12,469)	211,402	(47)	(43,533)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense	38,893	$ 0	0	38,893	0	0
Issuance of common stock upon exercise of stock options (in shares)		905
Issuance of common stock upon exercise of stock options	11,690	$ 1	0	11,689	0	0
Issuance of common stock related to employee stock purchase plan (in shares)		586
Issuance of common stock related to employee stock purchase plan	6,785	$ 0	0	6,785	0	0
Issuance of common stock upon vesting of RSUs (in shares)		783
Issuance of common stock upon vesting of RSUs	0	$ 0	0	0	0	0
Shares repurchased for tax withholdings on vesting of RSUs (in shares)		(294)
Shares repurchased for tax withholdings on vesting of RSUs	(11,654)	$ 0	0	(11,654)	0	0
Excess tax benefit from employee stock-based compensation plans	12,128	0	0	12,128	0	0
Retirement of treasury stock	0	0	12,469	(12,469)	0	0
Net income (loss)	49,432	0	0	0	0	49,432
Other comprehensive income (loss)	30	$ 0	0	0	30	0
Ending Balance (in shares) at Dec. 31, 2016		36,303
Ending Balance at Dec. 31, 2016	$ 262,660	$ 4	$ 0	$ 256,774	$ (17)	$ 5,899

Statement of Cash Flows

Statement of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 26, 2015	Dec. 27, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ 49,432	$ 6,186	$ (40,790)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	6,804	6,490	6,034
Stock-based compensation expense	38,815	29,768	24,658
Deferred and other income taxes	(33,037)	208	20,825
Excess tax benefit from employee stock-based compensation	(12,128)	(4,706)	0
Inventory write-down	346	1,656	3,471
Loss (gain) on disposal of fixed assets	219	(17)	0
Provision for doubtful accounts	147	309	0
Changes in operating assets and liabilities:
Accounts receivable	(28,014)	(19,434)	(4,193)
Inventories	(9,857)	(187)	(8,768)
Prepaid expenses and other assets	(2,510)	(2,561)	(878)
Accounts payable	1,260	1,265	963
Accrued liabilities and other liabilities	9,920	17,830	1,744
Deferred revenue	15,651	26,626	8,029
Net cash provided by operating activities	37,048	63,433	11,095
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of short-term investments	(134,825)	(61,725)	(87,698)
Proceeds from sales of short-term investments	0	2,006	3,010
Proceeds from maturities of short-term investments	115,637	79,821	32,607
Purchase of property and equipment	(8,095)	(6,289)	(7,614)
Net cash (used in) provided by investing activities	(27,283)	13,813	(59,695)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from employee stock purchase plan	6,785	5,099	5,878
Proceeds from exercise of stock options	11,690	4,403	5,364
Costs paid for initial public offering	0	0	(8)
Shares repurchased for tax withholdings on vesting of restricted stock units	(11,654)	(10,183)	(3,125)
Excess tax benefit from employee stock-based compensation	12,128	4,706	0
Distribution of income to Gigamon LLC members	0	0	(476)
Net cash provided by financing activities	18,949	4,025	7,633
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	28,714	81,271	(40,967)
CASH AND CASH EQUIVALENTS — Beginning of period	120,212	38,941	79,908
CASH AND CASH EQUIVALENTS — End of period	148,926	120,212	38,941
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Income taxes paid during the period	2,843	738	484
NON-CASH INVESTING AND FINANCING ACTIVITIES:
Unpaid property and equipment purchases	$ 589	$ 756	$ 207

Description of the Company

Description of the Company	12 Months Ended
	Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [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, service providers and governments 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").

Significant Accounting Policies

Significant Accounting Policies	12 Months Ended
	Dec. 31, 2016
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 2016 was a 53-week fiscal year ending on December 31, 2016 . Fiscal years 2015 , and 2014 were each 52-week fiscal years ending on December 26, 2015 , and December 27, 2014 , 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. 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 non-monetary 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 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 an 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. Estimates for sales returns are recorded as a reduction to revenue. As of December 31, 2016 and December 26, 2015 the Company recorded an allowance for doubtful accounts and sales return reserves of $1.0 million and $0.6 million , respectively. The following table presents the activity in the allowance for doubtful accounts and sales return reserves: Beginning Balance Charged to Operating Expenses Deductions/Additions Ending Balance (in thousands) Allowance for doubtful accounts Fiscal Year Ended: December 27, 2014 $ — $ — $ — $ — December 26, 2015 $ — $ 309 $ — $ 309 December 31, 2016 $ 309 $ 147 $ — $ 456 Beginning Balance Reduction of revenue Deductions/Additions (*) Ending Balance (in thousands) Sales return reserves Fiscal Year Ended: December 27, 2014 $ 191 $ 1,038 $ (1,073 ) $ 156 December 26, 2015 $ 156 $ 1,333 $ (1,197 ) $ 292 December 31, 2016 $ 292 $ 1,185 $ (954 ) $ 523 * Deductions/additions related to the sales return reserves represent amounts written off against the reserve, less recoveries. 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 and 2014 , no end-user customer accounted for 10% or more of revenue. For fiscal 2016, one end-user customer, T-Mobile, accounted for 10% of revenue. Customers that represented more than 10% of total revenue and accounts receivable are: Fiscal Year Ended December 31, 2016 December 26, 2015 December 27, 2014 Percent of Revenue: Customer A (distributor) 33 % 40 % 47 % Customer B (distributor) 26 % 21 % 16 % Customer C (end-user) 10 % * * * Represents less than 10% of total revenue As of December 31, 2016 December 26, 2015 Percent of Accounts Receivable: Customer A (distributor) 32 % 19 % Customer B (distributor) 16 % 30 % Customer C (end-user) 10 % 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 the majority of its 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. The Company recorded inventory write-downs of $0.3 million and $1.7 million within cost of revenue and $0.3 million and $0.9 million in recoveries from the sales of previously written-down inventory in fiscal 2016 and 2015 , respectively. In fiscal 2014 we recorded inventory write-downs of $3.5 million 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 concurrently 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 Company’s typical arrangement consists 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. 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 ("VSOE"), if available, third party evidence ("TPE") of the selling price if VSOE is not available, or best estimated selling prices ("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 10 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 31, 2016 and December 26, 2015 , deferred cost of product revenue was $0.0 million and $1.6 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 against defects in manufacturing on its hardware products. 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”), and Performance Stock Units ("PSUs") is measured and recognized in the consolidated financial statements based on the 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 the Company, combined with the historical volatility of a peer group of publicly traded companies. 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. Expenses for PSUs are recognized when the issuance of the underlying awards are probable, which is re-measured at each reporting period and the expense is trued up accordingly. Expenses 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. The Company currently utilizes two separate forfeiture rates, based on the classification of the employees. 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 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 our 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 carryforwards. Valuation allowances are provided when necessary to reduce deferred tax assets to the amount expected to be realized on a more likely than not basis. Significant judgment is required in determining any valuation allowance recorded against deferred tax assets. In assessing the need for a valuation allowance, the Company considers all available evidence, including past operating results, estimates of future taxable income and the feasibility of any viable tax planning strategies. 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 income tax provision in the period in which such determination is made. 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 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 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 as their effect is antidilutive. 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 of this standard by one year. Additionally, in March 2016 the FASB issued additional information that clarifies the implementation guidance on principal versus agent considerations. The new standard permits adoption either by using (i) a full retrospective approach for all periods presented in the period of adoption or (ii) a modified retrospective approach with the cumulative effect of initially applying the new standard recognized at the date of initial application and providing certain additional disclosures. The new standard is effective for annual reporting periods beginning after December 15, 2017, with early adoption permitted for annual reporting periods beginning after December 15, 2016. The Company does not plan to early adopt, and accordingly, it will adopt the new standard effective fiscal year 2018. The Company is in the early stages of its evaluation of the impact of the new standard on its accounting policies, processes, and system requirements and has not made a final decision regarding the adoption method. The Company's final determination will depend on a number of factors, such as the significance of the impact of the new standard on our financial results, system readiness, including that of software procured from third-party providers, and its ability to accumulate and analyze the information necessary to assess the impact on prior period financial statements, as necessary. While the Company continues to assess the potential impacts of the new standard it anticipates this standard could have a material impact on its consolidated financial statements. However the Company cannot reasonably estimate quantitative information related to the impact of the new standard on its financial statements at this time. In February 2016, the FASB issued an accounting standard update which amends the existing accounting standards for leases. Consistent with current guidance, the recognition, measurement, and presentation of expenses and cash flows arising from a lease by a lessee primarily will depend on its classification. Under the new guidance, a lessee will be required to recognize assets and liabilities for all leases with lease terms of more than 12 months. The effective date of this update will be for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018 using a modified retrospective transition method with early adoption permitted. The Company expects the standard to have a material impact on its assets and liabilities for the addition of right-of-use assets and lease liabilities, but the Company does not expect it to have a material impact on its results of operations or liquidity. In March 2016, the FASB issued an accounting standard related to Improvements to Employee Share-Based Payment Accounting, which amends Compensation – Stock Compensation. This standard includes provisions intended to simplify various aspects related to how share-based payments are accounted for and presented in the financial statements. The effective date of this standard will be for annual periods beginning after December 15, 2016, and interim periods within that reporting period. The Company believes the adoption of this standard will increase the volatility of income tax expense. In June 2016, the FASB issued new guidance that changes the accounting for recognizing impairments of financial assets. Under the new guidance, credit losses for certain types of financial instruments will be estimated based on expected losses. The new guidance also modifies the impairment models for available-for-sale debt securities and for purchased financial assets with credit deterioration since their origination. The effective date of this standard will be for annual periods ending after December 15, 2019, and interim periods within that reporting period. Early adoption is permitted starting in annual periods ending after December 15, 2018. The Company is evaluating the impact of this guidance on its consolidated financial statements. In August 2016, the FASB issued new guidance related to Classification of Certain Cash Receipts and Cash Payments. This standard provides guidance for eight cash flow classification issues to reduce diversity in practice. The clarification includes guidance on items such as debt prepayment or debt extinguishment cost, contingent consideration payment made after a business combination, proceeds from the settlement of insurance claims, proceeds from the settlement of corporate-owned life insurance policies and distributions received from equity method investees. The effective date of this standard is for annual periods beginning after December 15, 2017, and interim periods within those annual periods. Early adoption is permitted. The Company plans to adopt this new guidance in the first quarter of fiscal year 2017 and does not expect the adoption to have a material impact on its consolidated financial statements. In October 2016, the FASB issued new guidance that requires a reporting entity to recognize the tax expense from intra-entity asset transfers of assets other than inventory in the selling entity’s tax jurisdiction when the transfer occurs, even though the pre-tax effects of that transaction are eliminated in consolidation. Any deferred tax asset that arises in the buying entity’s jurisdiction would also be recognized at the time of the transfer. The new guidance will likely impact reporting entities’ effective tax rates. The new guidance is effective for interim and annual periods beginning after December 15, 2017 and early adoption is permitted. The amendment should be adopted using the modified retrospective approach with a cumulative-effect adjustment recorded in retained earnings as of the beginning of the period of adoption. The Company is evaluating the impact of this guidance on its consolidated financial statements. In November 2016, the FASB issued new guidance, restricted cash, which requires amounts generally described as restricted cash and restricted cash equivalents be included with cash and cash equivalents when reconciling the total beginning and ending amounts for the periods shown on the statement of cash flows. The new guidance is effective for annual periods beginning after December 15, 2018, and interim periods within those annual periods, using a retrospective transition method to each period presented. The Company does not expect the impact on its consolidated financial statements to be material.

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2016
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 31, 2016 Quoted Prices Significant Significant Cash and cash equivalents: Money market funds $ 99,992 $ 99,992 $ — $ — Commercial paper 1,999 — 1,999 Total cash equivalents 101,991 99,992 1,999 — Cash 46,935 Total cash and cash equivalents $ 148,926 Short-term investments: Corporate debt securities $ 10,110 $ — $ 10,110 $ — Commercial paper 12,956 — 12,956 — U.S. agency debt securities 21,697 — 21,697 — U.S. government securities 64,475 — 64,475 — Total short-term investments $ 109,238 $ — $ 109,238 $ — Fair Value Measured Using December 26, 2015 Quoted Prices Significant Significant 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 $ — 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 has no assets classified as Level 3. 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 31, 2016 and December 26, 2015 . As of December 31, 2016 and December 26, 2015 , 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 31, 2016 Amortized Gross Gross Fair Value Cash and cash equivalents: Money market funds $ 99,992 $ — $ — $ 99,992 Commercial paper 1,999 — — 1,999 Cash 46,935 — — 46,935 Total cash and cash equivalents $ 148,926 $ — $ — $ 148,926 Short-term investments: Corporate debt securities $ 10,119 $ — $ (9 ) $ 10,110 Commercial paper 12,956 — — 12,956 U.S. agency debt securities 21,698 1 (2 ) 21,697 U.S. government securities 64,482 8 (15 ) 64,475 Total short-term investments $ 109,255 $ 9 $ (26 ) $ 109,238 December 26, 2015 Amortized Gross Gross 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 The Company’s realized gain was immaterial in the twelve months ended December 31, 2016 . There were no securities in a material continuous loss position for 12 months or longer as of December 31, 2016 and December 26, 2015 . The contractual maturity date of the cash equivalents and short-term investments at estimated fair value was as follows (in thousands): As of December 31, 2016 December 26, 2015 Due within one year $ 205,250 $ 177,852 Due between one and five years 5,979 498 Total 211,229 178,350 Cash 46,935 31,863 Total $ 258,164 $ 210,213

Balance Sheet Components

Balance Sheet Components	12 Months Ended
	Dec. 31, 2016
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 31, 2016 December 26, 2015 Raw materials $ 50 $ 76 Finished goods 11,297 3,737 Total inventories, net $ 11,347 $ 3,813 Property and equipment, net Property and equipment, net, are comprised of the following (in thousands): As of December 31, 2016 December 26, 2015 Equipment and machinery $ 20,611 $ 14,932 Furniture and fixtures 654 308 Leasehold improvements 3,367 2,248 Software 2,519 1,963 Total property and equipment 27,151 19,451 Less accumulated depreciation and amortization (15,342 ) (10,035 ) Total property and equipment, net $ 11,809 $ 9,416 Depreciation expense was $5.3 million , $4.8 million and $4.3 million for fiscal 2016 , 2015 and 2014 , respectively. Accrued Liabilities Accrued liabilities are comprised of the following (in thousands): As of December 31, 2016 December 26, 2015 Accrued employee-related costs $ 25,468 $ 25,392 Accrued inventory and other purchases 1,778 2,452 Accrued taxes payable 1,977 1,918 Accrued professional services 667 1,655 Other accruals 4,759 5,625 Total accrued liabilities $ 34,649 $ 37,042 Accrued Warranty Accrued Warranty is comprised of the following (in thousands): Fiscal Year Ended December 31, 2016 December 26, 2015 December 27, 2014 Accrued warranty balance at beginning of period $ 807 $ 875 $ 686 Accrual for warranty during the period 1,560 984 949 Actual costs incurred (1,407 ) (1,052 ) (760 ) Accrued warranty balance at end of period $ 960 $ 807 $ 875 As of Warranty accrual reported as: December 31, 2016 December 26, 2015 Current $ 653 $ 490 Non-current 307 317 Total accrued warranty $ 960 $ 807 Deferred Revenue Deferred revenue is comprised of the following (in thousands): As of December 31, 2016 December 26, 2015 Deferred service revenue $ 97,646 $ 73,454 Deferred product revenue 136 $ 8,677 Total deferred revenue $ 97,782 $ 82,131 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 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 ) Available-for-sale securities: Unrealized gains, net 30 Total other comprehensive income 30 Balance as of December 31, 2016 $ (17 ) There were no reclassifications out of accumulated other comprehensive income (loss) into the consolidated statements of operations in fiscal 2016 and 2015 .

Related Party Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2016
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 2014 , the Company distributed $0.5 million ; and such distribution did not include income taxes for fiscal 2014. As of December 31, 2016 and December 26, 2015 , the members’ distribution payable was zero .

Comitments and Contingencies

Comitments and Contingencies	12 Months Ended
	Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Lease Commitments The Company leases 105,664 square feet of office space, located in Santa Clara, California, through March 2018, for an aggregate net base rent of $10.7 million . On February 8, 2017, the Company extended this lease for an additional 62 months , expiring in May, 2023 for an aggregate net base rent of $18.0 million . In addition to the monthly base rent, the Company is responsible under the new lease for payment of a management fee, certain insurance costs and real property taxes on a monthly basis. 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. On February 7, 2017, the Company entered into a lease agreement for office space adjacent to its headquarters totaling approximately 45,896 rentable square feet. The term commences on or about October 1, 2017 for an initial term of approximately ninety ( 90 ) months, expiring in March, 2025, for an aggregate net base rent of $14.4 million . In addition to the base rent, the Company is responsible under the lease for the payment of certain insurance costs and real property taxes on a monthly basis. 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 $3.9 million , $3.2 million and $2.9 million for fiscal 2016 , 2015 and 2014 , respectively. Future minimum lease payments under non-cancelable operating leases as of December 31, 2016 were as follows (in thousands): Fiscal Year: 2017 4,848 2018 5,691 2019 5,439 2020 5,487 2021-2025 17,418 Total $ 38,883 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-cancelable. As of December 31, 2016 and December 26, 2015 , the Company’s non-cancelable purchase commitments for such component inventory was $15.7 million and $12.0 million , respectively. Legal Proceedings On January 27, 2017, a purported shareholder class action was filed in the United States District Court for the Northern District of California against the Company and three of its current and former officers, Rodriguez v. Gigamon Inc., et al. , Case No. 17-cv-00434 (N.D. Cal. filed Jan. 27, 2017). The plaintiff alleges that the Company made false and misleading statements about its business, operations, and prospects, including statements about its guidance, for the fourth quarter of 2016. The complaint asserts claims for violations of Section 10(b) and 20(a) of the Securities Exchange Act of 1934, as amended, and SEC Rule 10b-5 on behalf of all persons and entities who acquired the Company’s securities between October 27, 2016 and January 17, 2017. The complaint seeks unspecified monetary damages, attorneys' fees and costs and other relief. The Company believes this lawsuit is without merit and intends to defend against it vigorously. In addition, 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 channel contracts and certain additional sales related contracts, the Company agrees to defend against certain third party claims asserting infringement of certain intellectual property rights, which typically include patents, copyrights and trademarks, and to pay judgments entered on, and certain damages and costs in connection with, such claims. The Company’s exposure under the channel indemnification provisions is generally limited to the total amount paid under the agreement (i) the twelve months preceding the claim, or (ii) the products at issue. However, certain agreements include indemnification provisions that could potentially expose the Company to losses in excess of the amount specified. The Company has not incurred any costs as a result of such indemnification obligations 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 company capacities. To date, there have been no claims under any indemnification provisions.

Preferred Stock and Stockholder

Preferred Stock and Stockholders’ Equity	12 Months Ended
	Dec. 31, 2016
Equity [Abstract]
Preferred Stock and Stockholders’ Equity	Preferred Stock and Stockholders’ Equity Preferred Stock The Company has authorized 20,000,000 shares of undesignated preferred stock, $0.0001 par value per share. As of December 31, 2016 and December 26, 2015 , the Company had no shares of preferred stock issued or 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 of Directors ("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 31, 2016 and December 26, 2015 , the Company had 36,303,219 and 34,323,457 shares of common stock issued and outstanding, respectively. Treasury Stock As of December 26, 2015 , 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. During the fiscal year ended December 31, 2016 , the Board authorized the retirement of the treasury stock. Equity Award Plans 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 31, 2016 , outstanding awards under the 2013 Equity Plan and the Option Plan covered 3,472,235 shares and 388,429 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 initial public offering in June 2013 (the "IPO"), 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 2016 , 2015 , and 2014 , the Company recorded stock-based compensation expense of $4.1 million , $2.7 million and $4.2 million , respectively for its ESPP. During fiscal 2016 there were two purchase periods that resulted in the issuance of 586,132 shares of common stock at a weighted average purchase price of $11.75 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. 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 28, 2013 3,367,637 $ 9.77 8.78 $ 62,725 Options granted 646,444 $ 20.21 Options exercised (790,147 ) $ 6.73 Options canceled (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 canceled (93,850 ) $ 9.76 Balance — December 26, 2015 2,170,720 $ 15.73 7.14 $ 24,910 Options granted 170,000 $ 46.62 Options exercised (904,939 ) $ 12.92 Options canceled (44,610 ) $ 20.25 Balance — December 31, 2016 1,391,171 $ 21.19 6.39 $ 35,076 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 Vested and expected to vest — December 31, 2016 1,328,319 $ 20.66 6.40 $ 34,036 Exercisable — December 31, 2016 804,475 $ 16.58 6.44 $ 23,306 Aggregate intrinsic value represents the difference between the exercise price of the awards and the Company’s fair value per share of $45.55 , $26.82 and $17.47 as of December 31, 2016 , December 26, 2015 and December 27, 2014 , respectively, for the total number of underlying options. During fiscal 2016, the Company accelerated the vesting of 16,059 shares of common stock pursuant to outstanding stock options and 8,582 RSUs, of certain employees, pursuant to the terms of their severance agreements. This accelerated vesting resulted in an expense reversal of $0.4 million during the fiscal year 2016 as the expenses associated with the vested options and RSUs on the date of modification were lower than the previously recognized stock-based compensation expense. During fiscal 2016, the Company entered into a consulting and transition agreement with a departing executive. Pursuant to the agreement the executive continues to vest in such executive's stock options and RSU’s as a consultant until the termination of the agreement. The terms of the consulting and transition agreement resulted in an expense of $0.8 million in fiscal 2016. 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 RSUs 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 31, 2016 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 - $12.42 304,000 6.81 $ 9.80 167,960 $ 9.24 $13.11 - $17.57 370,760 6.76 $ 15.45 311,750 $ 15.27 $19.00 - $19.00 25,492 6.42 $ 19.00 16,895 $ 19.00 $21.44 - $21.44 328,167 6.13 $ 21.44 122,332 $ 21.44 $29.36 - $57.45 362,752 5.13 $ 37.89 135,381 $ 30.16 1,391,171 6.39 $ 21.19 804,475 $ 16.58 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. 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 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 $ 23.40 RSUs vested (1,010,609 ) $ 17.27 RSUs canceled (307,742 ) $ 21.90 Balance - December 26, 2015 1,779,339 $ 22.64 1.53 $ 47,722 RSUs granted 1,711,497 $ 28.75 RSUs vested (783,152 ) $ 22.86 RSUs canceled (241,635 ) $ 24.23 Balance - December 31, 2016 2,466,049 $ 26.66 1.39 $ 112,329 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 Vested and expected to vest — December 31, 2016 2,125,762 $ 26.41 1.30 $ 96,828 Aggregate intrinsic value for RSUs represents the Company’s fair market value per share of $45.55 , $26.82 , and $17.47 as of December 31, 2016 , December 26, 2015 and December 27, 2014 , respectively, for the total number of underlying RSUs. Performance-Based Awards During the fiscal year ended December 31, 2016 , the Company awarded 193,000 shares of performance-based RSUs, or PSUs (Performance Stock Units). The vesting conditions of these awards were tied to the Company's fiscal 2016 revenue and operating income performance. These RSUs can vest from 0% to 200% of the target grant, based on attainment of the performance goals. The target achievement percentage as of December 31, 2016 was 149% . For the fiscal year ended December 31, 2016 , the Company has recorded $3.2 million on a graded-vesting basis, in stock-based compensation expense related to these PSU awards. 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 Company's common stock and the expected life of the options since the Company has 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. 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 31, December 26, December 27, Stock option awards: Expected term (in years) 4.6 4.6 5.27 - 6.08 Risk-free interest rate 1.4%-1.67% 1.6% 1.69% - 1.90% Expected volatility 61.7% -76.1% 56.04% 58.9% - 61.9% Expected dividend rate —% —% —% Grant date fair value per award $18.62-29.31 10.11 $5.94 - $17.67 ESPP purchase right: Expected term (in years) 0.5 - 2.0 0.5 - 2.0 0.5 - 2.0 Risk-free interest rate 0.42% - 0.74% 0.07% - 0.72% 0.05% - 0.42% Expected volatility 43.9% - 67.2% 37.6% - 59.9% 53.1% - 63.1% Expected dividend rate —% —% —% Grant date fair value per share $7.75 - $20.77 $5.48 - $12.64 $3.48 - $13.06 The cost of RSUs is determined using the fair value of the Company’s common stock on the date of the grant. In fiscal 2016 , the Company granted 1,711,497 RSUs with a grant date fair value per share ranging from $22.45 to $57.45 . 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 . As of December 31, 2016 , unrecognized compensation expense related to stock options, RSUs and ESPP purchase rights, net of estimated forfeitures, was $3.8 million , $26.9 million and $3.7 million , respectively, with a weighted-average remaining amortization period of 1.1 years , 1.4 years and 0.9 years , respectively. As of December 26, 2015 , unrecognized compensation expense related to unvested 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 31, 2016 and December 26, 2015 , there was $0.1 million and $0.1 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 31, December 26, December 27, Cost of revenue $ 1,928 $ 1,872 $ 1,679 Research and development 12,841 9,126 8,102 Sales and marketing 11,955 9,466 8,212 General and administrative 12,091 9,304 6,665 Total stock-based compensation expense $ 38,815 $ 29,768 $ 24,658 Common Stock Reserved for Future Issuance The Company had the following shares of common stock reserved for future issuance (in shares): As of December 31, 2016 December 26, 2015 Option Plan: Common stock subject to options outstanding 382,577 1,068,808 RSUs outstanding 5,852 58,949 Shares available for future grants — — 2013 Equity Plan: Common stock subject to options outstanding 1,012,038 1,105,356 RSUs outstanding 2,460,197 1,720,390 Shares available for future grants 3,622,506 3,753,018 ESPP 185,641 332,351 Common stock reserved for future issuances 7,668,811 8,038,872

Defined Contribution Plans

Defined Contribution Plans	12 Months Ended
	Dec. 31, 2016
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 each of fiscal 2016 and fiscal 2015 and $7,650 for fiscal 2014 . The Company’s contributions to the 401(k) defined contribution plan were $2.3 million , $1.8 million and $2.0 million for fiscal 2016 , 2015 and 2014 , respectively.

Income Tax

Income Tax	12 Months Ended
	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Income Tax	Income Tax Income (loss) before income tax benefit (provision) consisted of the following (in thousands): Fiscal Year Ended December 31, 2016 December 26, 2015 December 27, 2014 United States $ 27,936 $ 10,326 $ (20,682 ) Foreign 2,710 1,538 1,026 Total income (loss) before income tax benefit (provision) $ 30,646 $ 11,864 $ (19,656 ) The income tax benefit (provision) consisted of the following (in thousands): Fiscal Year Ended December 31, 2016 December 26, 2015 December 27, 2014 Federal: Current $ (12,166 ) $ (4,162 ) — Deferred 30,482 — (19,504 ) State: Current (1,225 ) (926 ) (24 ) Deferred 2,610 — (1,373 ) Foreign: Current (780 ) (661 ) (285 ) Deferred (135 ) 71 52 Total income tax benefit (provision) $ 18,786 $ (5,678 ) $ (21,134 ) The items accounting for the difference between income taxes computed at the federal statutory income tax rate and the income tax benefit (provision) consisted of the following (dollars in thousands): Fiscal Year Ended December 31, 2016 December 26, 2015 December 27, 2014 Federal statutory rate 35 % 35 % 35 % Effect of: Tax benefit (provision) at federal statutory rate $ (10,728 ) $ (4,153 ) $ 6,881 State tax benefit (provision), net of federal tax benefit (provision) (1,507 ) (405 ) 515 ESPP (1,537 ) (723 ) (1,106 ) Other permanent items (861 ) (305 ) (215 ) Impact of foreign operations (122 ) (8 ) 132 Tax credits 4,706 3,205 2,106 Change in valuation allowance 28,835 (3,289 ) (29,447 ) Total income tax benefit (provision) $ 18,786 $ (5,678 ) (21,134 ) 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 31, 2016 December 26, 2015 Deferred tax assets: Stock-based compensation $ 15,050 $ 12,895 Fixed assets 2,829 3,938 Accruals and reserves 6,288 6,750 Deferred revenue 7,651 4,895 Inventory reserve 1,276 971 Credits 4,304 3,825 Gross deferred tax assets 37,398 33,274 Valuation allowance (4,304 ) (33,139 ) Total deferred tax assets 33,094 135 Deferred tax liabilities — — Total $ 33,094 $ 135 As of December 31, 2016 , the Company recorded an income tax benefit of $18.8 million that includes the partial release of $30.5 million of the Company's existing valuation allowance against its U.S. deferred tax assets and additional foreign income tax expense. The Company considered all available positive and negative evidence in making a determination to release a portion of its existing valuation allowance. Such evidence included, among others, the Company's history of profitability and losses, jurisdictional income recognition trends, forecasted income by jurisdiction and achievement of three years of cumulative taxable income in the U.S. federal tax jurisdiction. Therefore, the Company determined that there is sufficient positive evidence to conclude that it is more likely than not that it will utilize its U.S deferred tax assets. Included in the net deferred tax asset balance is a $4.3 million valuation allowance that relates to research and development credits in a jurisdiction with a history of credits in excess of taxable profits. The following table presents the activity in the valuation allowance: Fiscal Year Ended December 31, 2016 December 26, 2015 December 27, 2014 Balance at the beginning of period $ 33,139 $ 27,851 $ — Additions 1,621 5,288 27,851 Deductions (30,456 ) — — Balance at end of Period $ 4,304 $ 33,139 $ 27,851 As of December 31, 2016 , the Company had federal and state net operating loss carryforwards of zero and approximately $3.3 million , respectively, available to reduce any future taxable income. If not utilized, the state net operating loss carryforwards will expire between fiscal 2033 and 2035. The Company also has federal and state research and development tax credit carryforwards of zero and approximately $6.6 million , respectively. The federal credit will start to expire between fiscal 2033 and 2036, 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 the accounting standard relating to 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 31, 2016 , the amount of excess tax benefits from stock options included in federal and state net operating losses was $0.0 million and $3.3 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 the accounting standard which 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 31, 2016 and December 26, 2015 , the Company had $5.2 million and $3.2 million of unrecognized tax benefits, respectively, which represented an increase in unrecognized tax benefits by $2.0 million during 2016. 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 31, 2016 and December 26, 2015 , respectively. A reconciliation of the beginning and ending amount of the unrecognized income tax benefits during the tax periods ended December 31, 2016 and December 26, 2015 are as follows (in thousands): Fiscal Year Ended December 31, 2016 December 26, 2015 December 27, 2014 Unrecognized tax benefits at the beginning of the period $ 3,247 $ 2,258 $ 186 Additions for tax positions related to the current year 2,001 1,424 1,824 Additions for tax positions related to the prior year — 112 248 Reductions for tax positions related to the prior year (7 ) (547 ) — Unrecognized tax benefits at the end of the period $ 5,241 $ 3,247 $ 2,258 The Company does not anticipate any material decreases 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 31, 2016 and December 26, 2015 , the Company had accrued no interest and penalties related to unrecognized tax benefits. As of December 31, 2016 , the Company had not recorded any tax provision for U.S. federal and state income taxes on approximately $2.6 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 2016, from 2012 to 2016 for state purposes, and 2013 to 2016 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.

Net Income (Loss) per Share

Net Income (Loss) per Share	12 Months Ended
	Dec. 31, 2016
Earnings Per Share [Abstract]
Net Income (Loss) per Share	Net Income (Loss) per Share Basic net income per share is computed using the weighted average number of common shares outstanding for the period, excluding unvested restricted stock. Diluted net income per share is computed based upon the weighted average common shares outstanding for the period plus dilutive potential common shares, including unvested restricted stock and stock options using the treasury stock method. The following table sets forth the computation of basic and diluted net income (loss) per share for fiscal 2016 , 2015 and 2014 (in thousands, except per share data): Fiscal Year Ended December 31, 2016 December 26, 2015 December 27, Numerator: Net income (loss) $ 49,432 $ 6,186 $ (40,790 ) Denominator: Weighted average shares used for basic net income (loss) per share computation 35,431 33,618 32,200 Weighted average effect of dilutive securities: Stock options 2,212 2,248 — Weighted average shares used for diluted net income (loss) per share computation 37,643 35,866 32,200 Net income (loss) per share: Basic $ 1.40 $ 0.18 $ (1.27 ) Diluted $ 1.31 $ 0.17 $ (1.27 ) 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 31, 2016 December 26, 2015 December 27, 2014 Equity awards to purchase common stock 125 654 6,339

Segment Information

Segment Information	12 Months Ended
	Dec. 31, 2016
Segment Reporting [Abstract]
Segment Information	11. 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 31, 2016 December 26, 2015 December 27, 2014 United States $ 240,649 $ 163,283 $ 116,921 Rest of Americas 9,791 10,696 8,499 Europe, Middle East and Africa 37,004 32,167 21,769 Asia Pacific 23,411 15,829 9,941 Total $ 310,855 $ 221,975 $ 157,130 The Company’s long-lived assets by geographic region are summarized as follows (in thousands): As of December 31, 2016 December 26, 2015 United States $ 9,907 $ 9,148 Other 1,902 268 Total $ 11,809 $ 9,416

Subsequent Event

Subsequent Event	12 Months Ended
	Dec. 31, 2016
Subsequent Events [Abstract]
Subsequent Event	Subsequent Event On February 3, 2017, the Company filed a Registration Statement on Form S-8 to registers additional shares of common stock of Gigamon Inc. under the Gigamon Inc. 2013 Equity Incentive Plan (the “2013 Plan”) for 1,464,740 shares and the Gigamon Inc. 2013 Employee Stock Purchase Plan (the “2013 ESPP”) for 439,422 shares. Irrevocable Standby Letter of Credit On February 16, 2017, the Company entered into an Irrevocable Standby Letter of Credit agreement with Wells Fargo Bank, N.A., as the lender (the “Letter of Credit”). The Letter of Credit, which matures on April 28, 2018, provides for a letter of credit in an aggregate principal amount of $0.8 million . The Company agreed to pay a letter of credit fee equal to one seventy-fifth of a percent ( 0.75% ) per annum of the stated face amount of the letter of credit for the number of days such letter of credit is to remain outstanding.

Quarterly Financial Information

Quarterly Financial Information	12 Months Ended
	Dec. 31, 2016
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 31, 2016 (in thousands, except per share amounts): Three Months Ended Dec 31, 2016 Oct 1, 2016 Jul 2, 2016 Apr 2, 2016 Dec 26, Sept 26, Jun 27, Mar 28, Consolidated Statement of Operations Data: Revenue: Product $ 59,430 $ 59,835 $ 51,308 $ 44,662 $ 47,051 $ 38,717 $ 34,814 $ 32,152 Service 25,599 23,677 23,795 22,549 19,973 17,935 16,632 14,701 Total revenue 85,029 83,512 75,103 67,211 67,024 56,652 51,446 46,853 Cost of revenue: Product 11,615 12,197 11,510 10,707 10,262 9,613 9,558 9,445 Service 2,210 2,141 2,339 2,082 1,669 1,708 1,763 1,777 Total cost of revenue 13,825 14,338 13,849 12,789 11,931 11,321 11,321 11,222 Gross profit 71,204 69,174 61,254 54,422 55,093 45,331 40,125 35,631 Research and development 17,170 18,306 17,250 15,358 13,171 12,677 12,227 11,496 Sales and marketing 34,167 31,994 28,843 27,657 26,150 21,388 21,171 18,832 General and administrative 8,869 8,887 9,147 7,995 7,788 6,950 6,702 6,019 Total operating expenses 60,206 59,187 55,240 51,010 47,109 41,015 40,100 36,347 Income (loss) from operations 10,998 9,987 6,014 3,412 7,984 4,316 25 (716 ) Interest income 265 235 219 207 116 106 105 119 Other (expense) income, net (305 ) (144 ) (173 ) (69 ) (119 ) (69 ) 7 (10 ) Income (loss) before income tax (provision) benefit 10,958 10,078 6,060 3,550 7,981 4,353 137 (607 ) Income tax (provision) benefit (4,535 ) (3,999 ) 27,899 (579 ) (5,418 ) (73 ) (99 ) (88 ) Net income (loss) 6,423 6,079 33,959 2,971 2,563 4,280 38 (695 ) Net income (loss) per share attributable to common stockholders: Basic $ 0.18 $ 0.17 $ 0.97 $ 0.09 $ 0.07 $ 0.13 $ — $ (0.02 ) Diluted $ 0.17 $ 0.16 $ 0.91 $ 0.08 $ 0.07 $ 0.12 $ — $ (0.02 )

Significant Accounting Polici21

Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2016
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 2016 was a 53-week fiscal year ending on December 31, 2016 . Fiscal years 2015 , and 2014 were each 52-week fiscal years ending on December 26, 2015 , and December 27, 2014 , 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.
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 non-monetary 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 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 an 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. Estimates for sales returns are recorded as a reduction to revenue. As of December 31, 2016 and December 26, 2015 the Company recorded an allowance for doubtful accounts and sales return reserves of $1.0 million and $0.6 million , respectively.
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 the majority of its 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 concurrently 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 Company’s typical arrangement consists 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. 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 ("VSOE"), if available, third party evidence ("TPE") of the selling price if VSOE is not available, or best estimated selling prices ("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 10 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 against defects in manufacturing on its hardware products. 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.
Share-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”), and Performance Stock Units ("PSUs") is measured and recognized in the consolidated financial statements based on the 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 the Company, combined with the historical volatility of a peer group of publicly traded companies. 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. Expenses for PSUs are recognized when the issuance of the underlying awards are probable, which is re-measured at each reporting period and the expense is trued up accordingly. Expenses 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. The Company currently utilizes two separate forfeiture rates, based on the classification of the employees.
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 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 our 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 carryforwards. Valuation allowances are provided when necessary to reduce deferred tax assets to the amount expected to be realized on a more likely than not basis. Significant judgment is required in determining any valuation allowance recorded against deferred tax assets. In assessing the need for a valuation allowance, the Company considers all available evidence, including past operating results, estimates of future taxable income and the feasibility of any viable tax planning strategies. 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 income tax provision in the period in which such determination is made.
Comprehensive Income (Loss)	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 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 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 as their effect is antidilutive.
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 of this standard by one year. Additionally, in March 2016 the FASB issued additional information that clarifies the implementation guidance on principal versus agent considerations. The new standard permits adoption either by using (i) a full retrospective approach for all periods presented in the period of adoption or (ii) a modified retrospective approach with the cumulative effect of initially applying the new standard recognized at the date of initial application and providing certain additional disclosures. The new standard is effective for annual reporting periods beginning after December 15, 2017, with early adoption permitted for annual reporting periods beginning after December 15, 2016. The Company does not plan to early adopt, and accordingly, it will adopt the new standard effective fiscal year 2018. The Company is in the early stages of its evaluation of the impact of the new standard on its accounting policies, processes, and system requirements and has not made a final decision regarding the adoption method. The Company's final determination will depend on a number of factors, such as the significance of the impact of the new standard on our financial results, system readiness, including that of software procured from third-party providers, and its ability to accumulate and analyze the information necessary to assess the impact on prior period financial statements, as necessary. While the Company continues to assess the potential impacts of the new standard it anticipates this standard could have a material impact on its consolidated financial statements. However the Company cannot reasonably estimate quantitative information related to the impact of the new standard on its financial statements at this time. In February 2016, the FASB issued an accounting standard update which amends the existing accounting standards for leases. Consistent with current guidance, the recognition, measurement, and presentation of expenses and cash flows arising from a lease by a lessee primarily will depend on its classification. Under the new guidance, a lessee will be required to recognize assets and liabilities for all leases with lease terms of more than 12 months. The effective date of this update will be for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018 using a modified retrospective transition method with early adoption permitted. The Company expects the standard to have a material impact on its assets and liabilities for the addition of right-of-use assets and lease liabilities, but the Company does not expect it to have a material impact on its results of operations or liquidity. In March 2016, the FASB issued an accounting standard related to Improvements to Employee Share-Based Payment Accounting, which amends Compensation – Stock Compensation. This standard includes provisions intended to simplify various aspects related to how share-based payments are accounted for and presented in the financial statements. The effective date of this standard will be for annual periods beginning after December 15, 2016, and interim periods within that reporting period. The Company believes the adoption of this standard will increase the volatility of income tax expense. In June 2016, the FASB issued new guidance that changes the accounting for recognizing impairments of financial assets. Under the new guidance, credit losses for certain types of financial instruments will be estimated based on expected losses. The new guidance also modifies the impairment models for available-for-sale debt securities and for purchased financial assets with credit deterioration since their origination. The effective date of this standard will be for annual periods ending after December 15, 2019, and interim periods within that reporting period. Early adoption is permitted starting in annual periods ending after December 15, 2018. The Company is evaluating the impact of this guidance on its consolidated financial statements. In August 2016, the FASB issued new guidance related to Classification of Certain Cash Receipts and Cash Payments. This standard provides guidance for eight cash flow classification issues to reduce diversity in practice. The clarification includes guidance on items such as debt prepayment or debt extinguishment cost, contingent consideration payment made after a business combination, proceeds from the settlement of insurance claims, proceeds from the settlement of corporate-owned life insurance policies and distributions received from equity method investees. The effective date of this standard is for annual periods beginning after December 15, 2017, and interim periods within those annual periods. Early adoption is permitted. The Company plans to adopt this new guidance in the first quarter of fiscal year 2017 and does not expect the adoption to have a material impact on its consolidated financial statements. In October 2016, the FASB issued new guidance that requires a reporting entity to recognize the tax expense from intra-entity asset transfers of assets other than inventory in the selling entity’s tax jurisdiction when the transfer occurs, even though the pre-tax effects of that transaction are eliminated in consolidation. Any deferred tax asset that arises in the buying entity’s jurisdiction would also be recognized at the time of the transfer. The new guidance will likely impact reporting entities’ effective tax rates. The new guidance is effective for interim and annual periods beginning after December 15, 2017 and early adoption is permitted. The amendment should be adopted using the modified retrospective approach with a cumulative-effect adjustment recorded in retained earnings as of the beginning of the period of adoption. The Company is evaluating the impact of this guidance on its consolidated financial statements. In November 2016, the FASB issued new guidance, restricted cash, which requires amounts generally described as restricted cash and restricted cash equivalents be included with cash and cash equivalents when reconciling the total beginning and ending amounts for the periods shown on the statement of cash flows. The new guidance is effective for annual periods beginning after December 15, 2018, and interim periods within those annual periods, using a retrospective transition method to each period presented. The Company does not expect the impact on its consolidated financial statements to be material.

Significant Accounting Polici22

Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2016
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 31, 2016 December 26, 2015 December 27, 2014 Percent of Revenue: Customer A (distributor) 33 % 40 % 47 % Customer B (distributor) 26 % 21 % 16 % Customer C (end-user) 10 % * * * Represents less than 10% of total revenue As of December 31, 2016 December 26, 2015 Percent of Accounts Receivable: Customer A (distributor) 32 % 19 % Customer B (distributor) 16 % 30 % Customer C (end-user) 10 % 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. 31, 2016
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 31, 2016 Quoted Prices Significant Significant Cash and cash equivalents: Money market funds $ 99,992 $ 99,992 $ — $ — Commercial paper 1,999 — 1,999 Total cash equivalents 101,991 99,992 1,999 — Cash 46,935 Total cash and cash equivalents $ 148,926 Short-term investments: Corporate debt securities $ 10,110 $ — $ 10,110 $ — Commercial paper 12,956 — 12,956 — U.S. agency debt securities 21,697 — 21,697 — U.S. government securities 64,475 — 64,475 — Total short-term investments $ 109,238 $ — $ 109,238 $ — Fair Value Measured Using December 26, 2015 Quoted Prices Significant Significant 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 $ —
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 31, 2016 Amortized Gross Gross Fair Value Cash and cash equivalents: Money market funds $ 99,992 $ — $ — $ 99,992 Commercial paper 1,999 — — 1,999 Cash 46,935 — — 46,935 Total cash and cash equivalents $ 148,926 $ — $ — $ 148,926 Short-term investments: Corporate debt securities $ 10,119 $ — $ (9 ) $ 10,110 Commercial paper 12,956 — — 12,956 U.S. agency debt securities 21,698 1 (2 ) 21,697 U.S. government securities 64,482 8 (15 ) 64,475 Total short-term investments $ 109,255 $ 9 $ (26 ) $ 109,238 December 26, 2015 Amortized Gross Gross 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
Schedule of Contractual Maturity Dates of Marketable Securities	The contractual maturity date of the cash equivalents and short-term investments at estimated fair value was as follows (in thousands): As of December 31, 2016 December 26, 2015 Due within one year $ 205,250 $ 177,852 Due between one and five years 5,979 498 Total 211,229 178,350 Cash 46,935 31,863 Total $ 258,164 $ 210,213

Balance Sheet Components (Table

Balance Sheet Components (Tables)	12 Months Ended
	Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Inventories	Inventories are comprised of the following (in thousands): As of December 31, 2016 December 26, 2015 Raw materials $ 50 $ 76 Finished goods 11,297 3,737 Total inventories, net $ 11,347 $ 3,813
Property and Equipment, Net	Property and equipment, net, are comprised of the following (in thousands): As of December 31, 2016 December 26, 2015 Equipment and machinery $ 20,611 $ 14,932 Furniture and fixtures 654 308 Leasehold improvements 3,367 2,248 Software 2,519 1,963 Total property and equipment 27,151 19,451 Less accumulated depreciation and amortization (15,342 ) (10,035 ) Total property and equipment, net $ 11,809 $ 9,416
Accrued Liabilities	Accrued liabilities are comprised of the following (in thousands): As of December 31, 2016 December 26, 2015 Accrued employee-related costs $ 25,468 $ 25,392 Accrued inventory and other purchases 1,778 2,452 Accrued taxes payable 1,977 1,918 Accrued professional services 667 1,655 Other accruals 4,759 5,625 Total accrued liabilities $ 34,649 $ 37,042
Accrued Warranty Liability	Accrued Warranty is comprised of the following (in thousands): Fiscal Year Ended December 31, 2016 December 26, 2015 December 27, 2014 Accrued warranty balance at beginning of period $ 807 $ 875 $ 686 Accrual for warranty during the period 1,560 984 949 Actual costs incurred (1,407 ) (1,052 ) (760 ) Accrued warranty balance at end of period $ 960 $ 807 $ 875 As of Warranty accrual reported as: December 31, 2016 December 26, 2015 Current $ 653 $ 490 Non-current 307 317 Total accrued warranty $ 960 $ 807
Deferred Revenue	Deferred revenue is comprised of the following (in thousands): As of December 31, 2016 December 26, 2015 Deferred service revenue $ 97,646 $ 73,454 Deferred product revenue 136 $ 8,677 Total deferred revenue $ 97,782 $ 82,131
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 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 ) Available-for-sale securities: Unrealized gains, net 30 Total other comprehensive income 30 Balance as of December 31, 2016 $ (17 )

Comitments and Contingencies (T

Comitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2016
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 31, 2016 were as follows (in thousands): Fiscal Year: 2017 4,848 2018 5,691 2019 5,439 2020 5,487 2021-2025 17,418 Total $ 38,883

Preferred Stock and Stockhold26

Preferred Stock and Stockholders’ Equity (Tables)	12 Months Ended
	Dec. 31, 2016
Equity [Abstract]
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 28, 2013 3,367,637 $ 9.77 8.78 $ 62,725 Options granted 646,444 $ 20.21 Options exercised (790,147 ) $ 6.73 Options canceled (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 canceled (93,850 ) $ 9.76 Balance — December 26, 2015 2,170,720 $ 15.73 7.14 $ 24,910 Options granted 170,000 $ 46.62 Options exercised (904,939 ) $ 12.92 Options canceled (44,610 ) $ 20.25 Balance — December 31, 2016 1,391,171 $ 21.19 6.39 $ 35,076 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 Vested and expected to vest — December 31, 2016 1,328,319 $ 20.66 6.40 $ 34,036 Exercisable — December 31, 2016 804,475 $ 16.58 6.44 $ 23,306
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 31, 2016 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 - $12.42 304,000 6.81 $ 9.80 167,960 $ 9.24 $13.11 - $17.57 370,760 6.76 $ 15.45 311,750 $ 15.27 $19.00 - $19.00 25,492 6.42 $ 19.00 16,895 $ 19.00 $21.44 - $21.44 328,167 6.13 $ 21.44 122,332 $ 21.44 $29.36 - $57.45 362,752 5.13 $ 37.89 135,381 $ 30.16 1,391,171 6.39 $ 21.19 804,475 $ 16.58
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 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 $ 23.40 RSUs vested (1,010,609 ) $ 17.27 RSUs canceled (307,742 ) $ 21.90 Balance - December 26, 2015 1,779,339 $ 22.64 1.53 $ 47,722 RSUs granted 1,711,497 $ 28.75 RSUs vested (783,152 ) $ 22.86 RSUs canceled (241,635 ) $ 24.23 Balance - December 31, 2016 2,466,049 $ 26.66 1.39 $ 112,329 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 Vested and expected to vest — December 31, 2016 2,125,762 $ 26.41 1.30 $ 96,828
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 31, December 26, December 27, Stock option awards: Expected term (in years) 4.6 4.6 5.27 - 6.08 Risk-free interest rate 1.4%-1.67% 1.6% 1.69% - 1.90% Expected volatility 61.7% -76.1% 56.04% 58.9% - 61.9% Expected dividend rate —% —% —% Grant date fair value per award $18.62-29.31 10.11 $5.94 - $17.67 ESPP purchase right: Expected term (in years) 0.5 - 2.0 0.5 - 2.0 0.5 - 2.0 Risk-free interest rate 0.42% - 0.74% 0.07% - 0.72% 0.05% - 0.42% Expected volatility 43.9% - 67.2% 37.6% - 59.9% 53.1% - 63.1% Expected dividend rate —% —% —% Grant date fair value per share $7.75 - $20.77 $5.48 - $12.64 $3.48 - $13.06
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 31, December 26, December 27, Cost of revenue $ 1,928 $ 1,872 $ 1,679 Research and development 12,841 9,126 8,102 Sales and marketing 11,955 9,466 8,212 General and administrative 12,091 9,304 6,665 Total stock-based compensation expense $ 38,815 $ 29,768 $ 24,658
Shares Reserved For Future Issuance Table	The Company had the following shares of common stock reserved for future issuance (in shares): As of December 31, 2016 December 26, 2015 Option Plan: Common stock subject to options outstanding 382,577 1,068,808 RSUs outstanding 5,852 58,949 Shares available for future grants — — 2013 Equity Plan: Common stock subject to options outstanding 1,012,038 1,105,356 RSUs outstanding 2,460,197 1,720,390 Shares available for future grants 3,622,506 3,753,018 ESPP 185,641 332,351 Common stock reserved for future issuances 7,668,811 8,038,872

Income Tax (Tables)

Income Tax (Tables)	12 Months Ended
	Dec. 31, 2016
Income Tax Disclosure [Abstract]
(Loss) Income Before Income Tax Benefit (Provision)	Income (loss) before income tax benefit (provision) consisted of the following (in thousands): Fiscal Year Ended December 31, 2016 December 26, 2015 December 27, 2014 United States $ 27,936 $ 10,326 $ (20,682 ) Foreign 2,710 1,538 1,026 Total income (loss) before income tax benefit (provision) $ 30,646 $ 11,864 $ (19,656 )
Income Tax Benefit (Provision)	The income tax benefit (provision) consisted of the following (in thousands): Fiscal Year Ended December 31, 2016 December 26, 2015 December 27, 2014 Federal: Current $ (12,166 ) $ (4,162 ) — Deferred 30,482 — (19,504 ) State: Current (1,225 ) (926 ) (24 ) Deferred 2,610 — (1,373 ) Foreign: Current (780 ) (661 ) (285 ) Deferred (135 ) 71 52 Total income tax benefit (provision) $ 18,786 $ (5,678 ) $ (21,134 )
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 benefit (provision) consisted of the following (dollars in thousands): Fiscal Year Ended December 31, 2016 December 26, 2015 December 27, 2014 Federal statutory rate 35 % 35 % 35 % Effect of: Tax benefit (provision) at federal statutory rate $ (10,728 ) $ (4,153 ) $ 6,881 State tax benefit (provision), net of federal tax benefit (provision) (1,507 ) (405 ) 515 ESPP (1,537 ) (723 ) (1,106 ) Other permanent items (861 ) (305 ) (215 ) Impact of foreign operations (122 ) (8 ) 132 Tax credits 4,706 3,205 2,106 Change in valuation allowance 28,835 (3,289 ) (29,447 ) Total income tax benefit (provision) $ 18,786 $ (5,678 ) (21,134 )
Deferred Tax Assets and Liabilities	The components of the Company’s deferred tax assets and liabilities are as follows (in thousands): As of December 31, 2016 December 26, 2015 Deferred tax assets: Stock-based compensation $ 15,050 $ 12,895 Fixed assets 2,829 3,938 Accruals and reserves 6,288 6,750 Deferred revenue 7,651 4,895 Inventory reserve 1,276 971 Credits 4,304 3,825 Gross deferred tax assets 37,398 33,274 Valuation allowance (4,304 ) (33,139 ) Total deferred tax assets 33,094 135 Deferred tax liabilities — — Total $ 33,094 $ 135
Summary of Valuation Allowance	The following table presents the activity in the valuation allowance: Fiscal Year Ended December 31, 2016 December 26, 2015 December 27, 2014 Balance at the beginning of period $ 33,139 $ 27,851 $ — Additions 1,621 5,288 27,851 Deductions (30,456 ) — — Balance at end of Period $ 4,304 $ 33,139 $ 27,851
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 31, 2016 and December 26, 2015 are as follows (in thousands): Fiscal Year Ended December 31, 2016 December 26, 2015 December 27, 2014 Unrecognized tax benefits at the beginning of the period $ 3,247 $ 2,258 $ 186 Additions for tax positions related to the current year 2,001 1,424 1,824 Additions for tax positions related to the prior year — 112 248 Reductions for tax positions related to the prior year (7 ) (547 ) — Unrecognized tax benefits at the end of the period $ 5,241 $ 3,247 $ 2,258

Net Income (Loss) per Share (Ta

Net Income (Loss) per Share (Tables)	12 Months Ended
	Dec. 31, 2016
Earnings Per Share [Abstract]
Net Income (Loss) per Share and Weighted-Average Shares	The following table sets forth the computation of basic and diluted net income (loss) per share for fiscal 2016 , 2015 and 2014 (in thousands, except per share data): Fiscal Year Ended December 31, 2016 December 26, 2015 December 27, Numerator: Net income (loss) $ 49,432 $ 6,186 $ (40,790 ) Denominator: Weighted average shares used for basic net income (loss) per share computation 35,431 33,618 32,200 Weighted average effect of dilutive securities: Stock options 2,212 2,248 — Weighted average shares used for diluted net income (loss) per share computation 37,643 35,866 32,200 Net income (loss) per share: Basic $ 1.40 $ 0.18 $ (1.27 ) Diluted $ 1.31 $ 0.17 $ (1.27 )
Potentially Dilutive Securities Excluded from Computation of Diluted Net (Loss) 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 31, 2016 December 26, 2015 December 27, 2014 Equity awards to purchase common stock 125 654 6,339

Segment Information (Tables)

Segment Information (Tables)	12 Months Ended
	Dec. 31, 2016
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 31, 2016 December 26, 2015 December 27, 2014 United States $ 240,649 $ 163,283 $ 116,921 Rest of Americas 9,791 10,696 8,499 Europe, Middle East and Africa 37,004 32,167 21,769 Asia Pacific 23,411 15,829 9,941 Total $ 310,855 $ 221,975 $ 157,130 The Company’s long-lived assets by geographic region are summarized as follows (in thousands): As of December 31, 2016 December 26, 2015 United States $ 9,907 $ 9,148 Other 1,902 268 Total $ 11,809 $ 9,416

Quarterly Financial Informati30

Quarterly Financial Information (Tables)	12 Months Ended
	Dec. 31, 2016
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 31, 2016 (in thousands, except per share amounts): Three Months Ended Dec 31, 2016 Oct 1, 2016 Jul 2, 2016 Apr 2, 2016 Dec 26, Sept 26, Jun 27, Mar 28, Consolidated Statement of Operations Data: Revenue: Product $ 59,430 $ 59,835 $ 51,308 $ 44,662 $ 47,051 $ 38,717 $ 34,814 $ 32,152 Service 25,599 23,677 23,795 22,549 19,973 17,935 16,632 14,701 Total revenue 85,029 83,512 75,103 67,211 67,024 56,652 51,446 46,853 Cost of revenue: Product 11,615 12,197 11,510 10,707 10,262 9,613 9,558 9,445 Service 2,210 2,141 2,339 2,082 1,669 1,708 1,763 1,777 Total cost of revenue 13,825 14,338 13,849 12,789 11,931 11,321 11,321 11,222 Gross profit 71,204 69,174 61,254 54,422 55,093 45,331 40,125 35,631 Research and development 17,170 18,306 17,250 15,358 13,171 12,677 12,227 11,496 Sales and marketing 34,167 31,994 28,843 27,657 26,150 21,388 21,171 18,832 General and administrative 8,869 8,887 9,147 7,995 7,788 6,950 6,702 6,019 Total operating expenses 60,206 59,187 55,240 51,010 47,109 41,015 40,100 36,347 Income (loss) from operations 10,998 9,987 6,014 3,412 7,984 4,316 25 (716 ) Interest income 265 235 219 207 116 106 105 119 Other (expense) income, net (305 ) (144 ) (173 ) (69 ) (119 ) (69 ) 7 (10 ) Income (loss) before income tax (provision) benefit 10,958 10,078 6,060 3,550 7,981 4,353 137 (607 ) Income tax (provision) benefit (4,535 ) (3,999 ) 27,899 (579 ) (5,418 ) (73 ) (99 ) (88 ) Net income (loss) 6,423 6,079 33,959 2,971 2,563 4,280 38 (695 ) Net income (loss) per share attributable to common stockholders: Basic $ 0.18 $ 0.17 $ 0.97 $ 0.09 $ 0.07 $ 0.13 $ — $ (0.02 ) Diluted $ 0.17 $ 0.16 $ 0.91 $ 0.08 $ 0.07 $ 0.12 $ — $ (0.02 )

Significant Accounting Polici31

Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 26, 2015	Dec. 27, 2014
Property, Plant and Equipment [Line Items]
Accounts receivable, allowance	$ 979	$ 601
Inventory write-down	346	1,656	$ 3,471
Recovery of inventory write down	300	900
Deferred product costs	$ 0	$ 1,600
Product warranties period (in years)	5 years
Minimum
Property, Plant and Equipment [Line Items]
Services revenue, recognition period (in years)	1 year
Maximum
Property, Plant and Equipment [Line Items]
Services revenue, recognition period (in years)	10 years

Significant Accounting Polici32

Significant Accounting Policies - Reserves and Allowances (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 26, 2015	Dec. 27, 2014
Allowance for doubtful accounts
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at the beginning of period	$ 309	$ 0	$ 0
Additions	147	309	0
Deductions/Additions	0	0	0
Balance at End of Period	456	309	0
Sales return reserves
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at the beginning of period	292	156	191
Additions	1,185	1,333	1,038
Deductions/Additions	(954)	(1,197)	(1,073)
Balance at End of Period	$ 523	$ 292	$ 156

Significant Accounting Polici33

Significant Accounting Policies - Customers Representing Major Revenue and Accounts Receivable (Details)	12 Months Ended
	Dec. 31, 2016	Dec. 26, 2015	Dec. 27, 2014
Total Revenue | Customer A (distributor)
Concentration Risk [Line Items]
Concentration risk	33.00%	40.00%	47.00%
Total Revenue | Customer B (distributor)
Concentration Risk [Line Items]
Concentration risk	26.00%	21.00%	16.00%
Total Revenue | Customer C (end-user)
Concentration Risk [Line Items]
Concentration risk	10.00%
Accounts Receivable | Customer A (distributor)
Concentration Risk [Line Items]
Concentration risk	32.00%	19.00%
Accounts Receivable | Customer B (distributor)
Concentration Risk [Line Items]
Concentration risk	16.00%	30.00%
Accounts Receivable | Customer C (end-user)
Concentration Risk [Line Items]
Concentration risk	10.00%	11.00%

Significant Accounting Polici34

Significant Accounting Policies - Useful Lives of Property and Equipment (Details)	12 Months Ended
	Dec. 31, 2016
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 (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 26, 2015
Cash and Cash Equivalents, at Carrying Value [Abstract]
Cash and cash equivalents	$ 148,926	$ 120,212
Short-term Investments [Abstract]
Short-term investments	109,238	90,001
Money market funds
Cash and Cash Equivalents, at Carrying Value [Abstract]
Cash and cash equivalents	99,992	83,852
Commercial paper
Cash and Cash Equivalents, at Carrying Value [Abstract]
Cash and cash equivalents	1,999	4,497
Short-term Investments [Abstract]
Short-term investments	12,956	8,986
Total cash equivalents
Cash and Cash Equivalents, at Carrying Value [Abstract]
Cash and cash equivalents	101,991	88,349
Cash
Cash and Cash Equivalents, at Carrying Value [Abstract]
Cash and cash equivalents	46,935	31,863
Corporate debt securities
Short-term Investments [Abstract]
Short-term investments	10,110	14,560
U.S. agency debt securities
Short-term Investments [Abstract]
Short-term investments	21,697	29,008
U.S. government securities
Short-term Investments [Abstract]
Short-term investments	64,475	37,447
Quoted Prices in Active Markets for Identical Assets (Level 1) | Money market funds
Cash and Cash Equivalents, at Carrying Value [Abstract]
Cash and cash equivalents	99,992	83,852
Quoted Prices in Active Markets for Identical Assets (Level 1) | Total cash equivalents
Cash and Cash Equivalents, at Carrying Value [Abstract]
Cash and cash equivalents	99,992	83,852
Significant Other Observable Inputs (Level 2)
Short-term Investments [Abstract]
Short-term investments	109,238	90,001
Significant Other Observable Inputs (Level 2) | Commercial paper
Cash and Cash Equivalents, at Carrying Value [Abstract]
Cash and cash equivalents	1,999	4,497
Short-term Investments [Abstract]
Short-term investments	12,956	8,986
Significant Other Observable Inputs (Level 2) | Total cash equivalents
Cash and Cash Equivalents, at Carrying Value [Abstract]
Cash and cash equivalents	1,999	4,497
Significant Other Observable Inputs (Level 2) | Corporate debt securities
Short-term Investments [Abstract]
Short-term investments	10,110	14,560
Significant Other Observable Inputs (Level 2) | U.S. agency debt securities
Short-term Investments [Abstract]
Short-term investments	21,697	29,008
Significant Other Observable Inputs (Level 2) | U.S. government securities
Short-term Investments [Abstract]
Short-term investments	$ 64,475	$ 37,447

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 (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 26, 2015
Cash and Cash Equivalents
Cash And Cash Equivalents And Short Term Investments [Line Items]
Amortized Costs	$ 148,926	$ 120,212
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	148,926	120,212
Cash and Cash Equivalents | Money market funds
Cash And Cash Equivalents And Short Term Investments [Line Items]
Amortized Costs	99,992	83,852
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	99,992	83,852
Cash and Cash Equivalents | Commercial paper
Cash And Cash Equivalents And Short Term Investments [Line Items]
Amortized Costs	1,999	4,497
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	1,999	4,497
Cash and Cash Equivalents | Cash
Cash And Cash Equivalents And Short Term Investments [Line Items]
Amortized Costs	46,935	31,863
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	46,935	31,863
Short-term Investments
Cash And Cash Equivalents And Short Term Investments [Line Items]
Amortized Costs	109,255	90,048
Gross Unrealized Gains	9	3
Gross Unrealized Losses	(26)	(50)
Fair Value	109,238	90,001
Short-term Investments | Commercial paper
Cash And Cash Equivalents And Short Term Investments [Line Items]
Amortized Costs	12,956	8,986
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	12,956	8,986
Short-term Investments | Corporate debt securities
Cash And Cash Equivalents And Short Term Investments [Line Items]
Amortized Costs	10,119	14,570
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(9)	(10)
Fair Value	10,110	14,560
Short-term Investments | U.S. agency debt securities
Cash And Cash Equivalents And Short Term Investments [Line Items]
Amortized Costs	21,698	29,031
Gross Unrealized Gains	1	0
Gross Unrealized Losses	(2)	(23)
Fair Value	21,697	29,008
Short-term Investments | U.S. government securities
Cash And Cash Equivalents And Short Term Investments [Line Items]
Amortized Costs	64,482	37,461
Gross Unrealized Gains	8	3
Gross Unrealized Losses	(15)	(17)
Fair Value	$ 64,475	$ 37,447

Fair Value Measurements - Contr

Fair Value Measurements - Contractual Maturity Date of Short-Term Investments (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 26, 2015
Fair Value Disclosures [Abstract]
Due within one year	$ 205,250	$ 177,852
Due between one and five years	5,979	498
Total	211,229	178,350
Cash	46,935	31,863
Total	$ 258,164	$ 210,213

Balance Sheet Components - Inve

Balance Sheet Components - Inventories (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 26, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Raw materials	$ 50	$ 76
Finished goods	11,297	3,737
Total inventories, net	$ 11,347	$ 3,813

Balance Sheet Components - Prop

Balance Sheet Components - Property and Equipment, Net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 26, 2015	Dec. 27, 2014
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 27,151	$ 19,451
Less accumulated depreciation and amortization	(15,342)	(10,035)
Total property and equipment, net	11,809	9,416
Depreciation	5,300	4,800	$ 4,300
Equipment and machinery
Property, Plant and Equipment [Line Items]
Property and equipment, gross	20,611	14,932
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, gross	654	308
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	3,367	2,248
Software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 2,519	$ 1,963

Balance Sheet Components - Accr

Balance Sheet Components - Accrued Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 26, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accrued employee-related costs	$ 25,468	$ 25,392
Accrued inventory and other purchases	1,778	2,452
Accrued taxes payable	1,977	1,918
Accrued professional services	667	1,655
Other accruals	4,759	5,625
Total accrued liabilities	$ 34,649	$ 37,042

Balance Sheet Components - Ac41

Balance Sheet Components - Accrued Warranty (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 26, 2015	Dec. 27, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accrued warranty balance at beginning of period	$ 807	$ 875	$ 686
Accrual for warranty during the period	1,560	984	949
Actual costs incurred	(1,407)	(1,052)	(760)
Accrued warranty balance at end of period	960	807	$ 875
Warranty accrual reported as:
Current	653	490
Non-current	$ 307	$ 317

Balance Sheet Components - Defe

Balance Sheet Components - Deferred Revenue (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 26, 2015
Deferred Revenue Arrangement [Line Items]
Deferred revenue	$ 97,782	$ 82,131
Deferred service revenue
Deferred Revenue Arrangement [Line Items]
Deferred revenue	97,646	73,454
Deferred product revenue
Deferred Revenue Arrangement [Line Items]
Deferred revenue	$ 136	$ 8,677

Balance Sheet Components - Accu

Balance Sheet Components - Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 26, 2015	Dec. 27, 2014
Net Unrealized Gain (Loss)
Beginning balance	$ (47)	$ (94)	$ 23
Ending balance	(17)	(47)	(94)
Accumulated Net Unrealized Investment Gain (Loss)
Net Unrealized Gain (Loss)
Other comprehensive income (loss), before tax	$ 30	$ 47	$ (117)

Related Party Transactions (Det

Related Party Transactions (Details) - USD ($)	12 Months Ended
	Dec. 27, 2014	Dec. 31, 2016	Dec. 26, 2015
Related Party Transactions [Abstract]
Cash distribution to members	$ 500,000
Income taxes paid on behalf of member included in distribution	$ 0
Gigamon LLC members' distribution payable		$ 0	$ 0

Comitments and Contingencies -

Comitments and Contingencies - Future Minimum Lease Payments Under Non-Cancelable Operating Leases (Details) $ in Thousands	Dec. 31, 2016USD ($)
Commitments and Contingencies Disclosure [Abstract]
2,017	$ 4,848
2,018	5,691
2,019	5,439
2,020	5,487
2021-2025	17,418
Total	$ 38,883

Comitments and Contingencies 46

Comitments and Contingencies - Additional Information (Details) $ in Millions	Feb. 08, 2017USD ($)	Feb. 07, 2017USD ($)ft²	Dec. 31, 2016USD ($)ft²	Dec. 26, 2015USD ($)	Dec. 27, 2014USD ($)
Subsequent Event [Line Items]
Office space lease area | ft²			105,664
Base rent			$ 10.7
Rent expense for operating leases			3.9	$ 3.2	$ 2.9
Purchase commitments with vendors			$ 15.7	$ 12
Subsequent Event
Subsequent Event [Line Items]
Office space lease area | ft²		45,896
Lease term	62 months	90 months
Base rent	$ 18	$ 14.4

Preferred Stock and Stockhold47

Preferred Stock and Stockholders’ Equity - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 26, 2015	Dec. 31, 2016
Equity [Abstract]
Preferred stock, shares authorized	20,000,000	20,000,000
Preferred stock, par value (in usd per share)	$ 0.0001	$ 0.0001
Preferred stock, shares issued	0	0
Common stock, shares authorized	1,000,000,000	1,000,000,000
Common stock, par value (in usd per share)	$ 0.0001	$ 0.0001
Common stock votes per share		$ 1
Common stock, shares, issued	34,323,457	36,303,219
Treasury stock, shares	8,109,848	0
Treasury stock, value	$ 12,469	$ 0
Treasury stock acquired, average cost per share (in usd per share)	$ 1.53

Preferred Stock and Stockhold48

Preferred Stock and Stockholders’ Equity - 2013 Equity Incentive Plan and ESPP (Details) $ / shares in Units, $ in Thousands	1 Months Ended	12 Months Ended
	Jun. 30, 2013Periodshares	Dec. 31, 2016USD ($)Period$ / sharesshares	Dec. 26, 2015USD ($)shares	Dec. 27, 2014USD ($)shares	May 31, 2013shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding awards (in shares)		7,668,811	8,038,872
Number of purchase periods | Period		2
Stock-based compensation expense | $		$ 38,815	$ 29,768	$ 24,658
Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding awards (in shares)		388,429
Employee stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized	439,422
Number of additional shares authorized				439,422
Eligible compensation to purchase shares through ESPP, maximum	15.00%
Discount fro market value on purchase of shares through ESPP	85.00%
Offering period, ESPP	24 months
Number of purchase periods | Period	4
Term of purchase period	6 months
Stock-based compensation expense | $		$ 4,100	$ 2,700	$ 4,200
Shares issued in period		586,132
Weighted average price (in usd per share) | $ / shares		$ 11.75
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number outstanding, granted (in shares)		1,711,497	1,364,465	1,668,228
Stock-based compensation expense | $		$ 3,200
Performance Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number outstanding, granted (in shares)		193,000
Award vesting percentage		149.00%
Performance Units | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage		0.00%
Performance Units | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage		200.00%
2013 Equity Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized					2,929,481
Annual increase (decrease) in common shares authorized		4,967,172
Additional shares allowable for future authorization		1,464,740
Percentage of outstanding stock maximum		5.00%
Outstanding awards (in shares)		3,472,235
2013 Equity Plan | Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding awards (in shares)		1,012,038	1,105,356
2013 Equity Plan | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding awards (in shares)		2,460,197	1,720,390

Preferred Stock and Stockhold49

Preferred Stock and Stockholders’ Equity - Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 26, 2015	Dec. 27, 2014	Dec. 28, 2013
Aggregate Intrinsic Value
Net expense (reversal) of compensation	$ 400		$ 400
Number of shares affected by modification			10,666
Employee Stock Option
Number of Stock Options Outstanding
Number of stock options outstanding, beginning of period	2,170,720	2,379,968	3,367,637
Number of stock options outstanding, granted	170,000	408,000	646,444
Number of stock options outstanding, options exercised	(904,939)	(523,398)	(790,147)
Number of stock options outstanding, canceled	(44,610)	(93,850)	(843,966)
Number of stock options outstanding, end of period	1,391,171	2,170,720	2,379,968	3,367,637
Weighted- Average Exercise Price
Weighted- Average Exercise Price, beginning of period (in usd per share)	$ 15.73	$ 12.91	$ 9.77
Weighted- Average Exercise Price, options granted (in usd per share)	46.62	21.44	20.21
Weighted- Average Exercise Price, options exercised (in usd per share)	12.92	8.42	6.73
Weighted- Average Exercise Price, options canceled (in usd per share)	20.25	9.76	11.75
Weighted- Average Exercise Price, end of period (in usd per share)	$ 21.19	$ 15.73	$ 12.91	$ 9.77
Weighted- Average Remaining Contractual Life (Years)
Weighted- Average Remaining Contractual Life (Years)	6 years 4 months 20 days	7 years 1 month 20 days	7 years 6 months	8 years 9 months 11 days
Aggregate Intrinsic Value
Aggregate Intrinsic Value	$ 35,076	$ 24,910	$ 14,368	$ 62,725
Vested and expected to vest, options outstanding	1,328,319	2,066,613	2,230,425
Vested and expected to vest, weighted-average exercise price (in usd per share)	$ 20.66	$ 15.55	$ 12.71
Vested and expected to vest, remaining contractual life	6 years 4 months 24 days	7 years 1 month 20 days	8 years 2 months 1 day
Vested and expected to vest, aggregate intrinsic value	$ 34,036	$ 24,088	$ 13,754
Exercisable, options outstanding	804,475	1,114,119	936,061
Exercisable, weighted average exercise price (in usd per share)	$ 16.58	$ 13.23	$ 9.71
Exercisable, weighted average remaining contractual life	6 years 5 months 8 days	7 years 2 months 12 days	7 years 10 months 6 days
Exercisable, aggregate intrinsic value	$ 23,306	$ 15,536	$ 7,643
Accelerated vesting, number of shares	16,059		31,211
Share price (in usd per share)	$ 45.55	$ 26.82
Employee Stock Option | 2013 Equity Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	4 years
Award vesting percentage	25.00%
Equity plan term	10 years
Vesting period after termination of employment	3 months
Employee Stock Option | 2012 Equity Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period after termination of employment	30 days
Restricted Stock Units (RSUs)
Aggregate Intrinsic Value
Accelerated vesting, number of shares	8,582		9,347
Share price (in usd per share)	$ 45.55	$ 26.82	$ 17.47
Terminated Executive
Aggregate Intrinsic Value
Net expense (reversal) of compensation	$ 800		$ 300

Preferred Stock and Stockhold50

Preferred Stock and Stockholders’ Equity - Outstanding Stock Options and Vest and Exercisable Stock Options (Details)	12 Months Ended
	Dec. 31, 2016$ / sharesshares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Stock Options Outstanding (in shares) | shares	1,391,171
Weighted- Average Remaining Contractual Life (Years)	6 years 4 months 20 days
Weighted- Average Exercise Price per Share (in usd per share)	$ 21.19
Shares Subject to Stock Options (in shares) | shares	804,475
Weighted- Average Exercise Price per Share (in usd per share)	$ 16.58
$0.00 - $12.42
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Stock Options Outstanding (in shares) | shares	304,000
Weighted- Average Remaining Contractual Life (Years)	6 years 9 months 21 days
Weighted- Average Exercise Price per Share (in usd per share)	$ 9.80
Shares Subject to Stock Options (in shares) | shares	167,960
Weighted- Average Exercise Price per Share (in usd per share)	$ 9.24
Exercise Prices, Lower Limit (in usd per share)	0
Exercise Prices, Upper Limit (in usd per share)	$ 12.42
$13.11 - $17.57
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Stock Options Outstanding (in shares) | shares	370,760
Weighted- Average Remaining Contractual Life (Years)	6 years 9 months 3 days
Weighted- Average Exercise Price per Share (in usd per share)	$ 15.45
Shares Subject to Stock Options (in shares) | shares	311,750
Weighted- Average Exercise Price per Share (in usd per share)	$ 15.27
Exercise Prices, Lower Limit (in usd per share)	13.11
Exercise Prices, Upper Limit (in usd per share)	$ 17.57
$19.00 - $19.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Stock Options Outstanding (in shares) | shares	25,492
Weighted- Average Remaining Contractual Life (Years)	6 years 5 months 1 day
Weighted- Average Exercise Price per Share (in usd per share)	$ 19
Shares Subject to Stock Options (in shares) | shares	16,895
Weighted- Average Exercise Price per Share (in usd per share)	$ 19
Exercise Prices, Lower Limit (in usd per share)	19
Exercise Prices, Upper Limit (in usd per share)	$ 19
$21.44 - $21.44
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Stock Options Outstanding (in shares) | shares	328,167
Weighted- Average Remaining Contractual Life (Years)	6 years 1 month 17 days
Weighted- Average Exercise Price per Share (in usd per share)	$ 21.44
Shares Subject to Stock Options (in shares) | shares	122,332
Weighted- Average Exercise Price per Share (in usd per share)	$ 21.44
Exercise Prices, Lower Limit (in usd per share)	21.44
Exercise Prices, Upper Limit (in usd per share)	$ 21.44
$29.36 - $57.45
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Stock Options Outstanding (in shares) | shares	362,752
Weighted- Average Remaining Contractual Life (Years)	5 years 1 month 17 days
Weighted- Average Exercise Price per Share (in usd per share)	$ 37.89
Shares Subject to Stock Options (in shares) | shares	135,381
Weighted- Average Exercise Price per Share (in usd per share)	$ 30.16
Exercise Prices, Lower Limit (in usd per share)	29.36
Exercise Prices, Upper Limit (in usd per share)	$ 57.45

Preferred Stock and Stockhold51

Preferred Stock and Stockholders’ Equity - Restricted Stock Units Activity (Details) - Restricted Stock Units (RSUs) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 26, 2015	Dec. 27, 2014	Dec. 28, 2013
Number of RSUs Outstanding
Number outstanding, beginning balance (in shares)	1,779,339	1,733,225	840,949
Number outstanding, granted (in shares)	1,711,497	1,364,465	1,668,228
Number outstanding, vested (in shares)	(783,152)	(1,010,609)	(397,239)
Number outstanding, canceled (in shares)	(241,635)	(307,742)	(378,713)
Number outstanding, ending balance (in shares)	2,466,049	1,779,339	1,733,225	840,949
Weighted- Average Grant Date Fair Value
Weighted average grant date fair value, beginning balance (in usd per share)	$ 22.64	$ 18.79	$ 21
Weighted- Average Grant Date Fair Value, granted (in usd per share)	28.75	23.40	19.58
Weighted- Average Grant Date Fair Value, vested (in usd per share)	22.86	17.27	21.18
Weighted- Average Grant Date Fair Value, canceled (in usd per share)	24.23	21.90	24.64
Weighted average grant date fair value, ending balance (in usd per share)	$ 26.66	$ 22.64	$ 18.79	$ 21
Weighted- Average Remaining Contractual Life (Years)
Weighted- Average Remaining Contractual Life (Years)	1 year 4 months 20 days	1 year 6 months 10 days	1 year 3 months 7 days	1 year 4 months 24 days
Aggregate Intrinsic Value
Aggregate Intrinsic Value	$ 112,329	$ 47,722	$ 30,245	$ 23,790
Vested and expected to vest, outstanding (in shares)	2,125,762	1,510,440	1,521,263.80
Vested and expected to vest, weighted average grant date fair value (in usd per share)	$ 26.41	$ 22.53	$ 18.66
Vested and expected to vest, remaining contractual life	1 year 3 months 18 days	1 year 5 months 4 days	1 year 2 months 4 days
Vested and expected to vest, aggregate Intrinsic value	$ 96,828	$ 40,510	$ 26,580
Share price (in usd per share)	$ 45.55	$ 26.82	$ 17.47
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	1 year
Weighted- Average Grant Date Fair Value
Weighted- Average Grant Date Fair Value, granted (in usd per share)	$ 22.45	16.31	10.75
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	4 years
Weighted- Average Grant Date Fair Value
Weighted- Average Grant Date Fair Value, granted (in usd per share)	$ 57.45	$ 33.95	$ 34.26

Preferred Stock and Stockhold52

Preferred Stock and Stockholders’ Equity - Stock-Based Compensation Expense (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 26, 2015	Dec. 27, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Total stock-based compensation expense	$ 38,815	$ 29,768	$ 24,658
Cost of revenue
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Total stock-based compensation expense	1,928	1,872	1,679
Research and development
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Total stock-based compensation expense	12,841	9,126	8,102
Sales and marketing
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Total stock-based compensation expense	11,955	9,466	8,212
General and administrative
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Total stock-based compensation expense	$ 12,091	$ 9,304	6,665
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Expected term	4 years 7 months 6 days	4 years 7 months 6 days
Risk free interest rate		1.60%
Grant date fair value per award, stock options (in usd per share)		$ 10.11
Unrecognized compensation expense	$ 3,800	$ 3,300	$ 5,100
Weighted average remaining amortization period	1 year 1 month 13 days	1 year	1 year 1 month 6 days
Employee Stock Option | Minimum
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Expected term			5 years 3 months 7 days
Risk free interest rate	1.40%		1.69%
Expected volatility	61.70%	56.04%	58.90%
Grant date fair value per award, stock options (in usd per share)	$ 18.62		$ 5.94
Employee Stock Option | Maximum
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Expected term			6 years 29 days
Risk free interest rate	1.67%		1.90%
Expected volatility	76.10%		61.90%
Grant date fair value per award, stock options (in usd per share)	$ 29.31		$ 17.67
Employee stock
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Unrecognized compensation expense	$ 26,900	$ 18,200	$ 16,200
Weighted average remaining amortization period	1 year 4 months 20 days	1 year 6 months	1 year 3 months 18 days
Total stock-based compensation expense	$ 4,100	$ 2,700	$ 4,200
Employee stock | Minimum
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Expected term	6 months	6 months	6 months
Risk free interest rate	0.42%	0.07%	0.05%
Expected volatility	43.90%	37.60%	53.10%
Grant date fair value per share, ESPP (in usd per share)	$ 7.75	$ 5.48	$ 3.48
Employee stock | Maximum
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Expected term	2 years	2 years	2 years
Risk free interest rate	0.74%	0.72%	0.42%
Expected volatility	67.20%	59.90%	63.10%
Grant date fair value per share, ESPP (in usd per share)	$ 20.77	$ 12.64	$ 13.06
Restricted Stock Units (RSUs)
Share based Compensation Arrangement Assumptions Used to Estimate Fair Values of Share Options Granted [Line Items]
Number outstanding, granted (in shares)	1,711,497	1,364,465	1,668,228
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Weighted- Average Grant Date Fair Value, granted (in usd per share)	$ 28.75	$ 23.40	$ 19.58
Unrecognized compensation expense	$ 3,700	$ 1,400	$ 3,500
Weighted average remaining amortization period	10 months 24 days	10 months 24 days	8 months 12 days
Total stock-based compensation expense	$ 3,200
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 usd per share)	$ 22.45	$ 16.31	$ 10.75
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 usd per share)	$ 57.45	$ 33.95	$ 34.26
Inventories
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Capitalized stock compensation costs	$ 100	$ 100

Preferred Stock and Stockhold53

Preferred Stock and Stockholders’ Equity - Common Units/Sock Reserved For Future Issuance (Details) - shares	Dec. 31, 2016	Dec. 26, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding awards (in shares)	7,668,811	8,038,872
2013 Equity Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding awards (in shares)	3,472,235
ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding awards (in shares)	185,641	332,351
Common stock subject to options outstanding
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding awards (in shares)	388,429
Common stock subject to options outstanding | Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding awards (in shares)	382,577	1,068,808
Common stock subject to options outstanding | 2013 Equity Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding awards (in shares)	1,012,038	1,105,356
RSUs outstanding | Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding awards (in shares)	5,852	58,949
RSUs outstanding | 2013 Equity Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding awards (in shares)	2,460,197	1,720,390
Shares available for future grants | Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding awards (in shares)	0	0
Shares available for future grants | 2013 Equity Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding awards (in shares)	3,622,506	3,753,018

Defined Contribution Plans (Det

Defined Contribution Plans (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 26, 2015	Dec. 27, 2014
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	$ 7,950	$ 7,650
Contributions to 401(k) defined contribution plan	$ 2,300,000	$ 1,800,000	$ 2,000,000

Income Tax - Additional Informa

Income Tax - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Oct. 01, 2016	Jul. 02, 2016	Apr. 02, 2016	Dec. 26, 2015	Sep. 26, 2015	Jun. 27, 2015	Mar. 28, 2015	Dec. 31, 2016	Dec. 26, 2015	Dec. 27, 2014	Dec. 28, 2013
Operating Loss Carryforwards [Line Items]
Excess tax benefit from stock options									$ 12,128	$ 4,706	$ 0
Unrecognized tax benefits	$ 5,241				$ 3,247				5,241	3,247	2,258	$ 186
Unrecognized tax benefits, increase									2,000
Undistributed earnings in foreign subsidiaries	2,600								2,600
Income Tax Expense (Benefit)	4,535	$ 3,999	$ (27,899)	$ 579	5,418	$ 73	$ 99	$ 88	(18,786)	5,678	$ 21,134
Valuation allowance, change									30,500
Valuation allowance	4,304				$ 33,139				4,304	$ 33,139
Federal
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	0								0
Excess tax benefit from stock options									0
State
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	3,300								3,300
Excess tax benefit from stock options									3,300
Research Tax Credit Carryforward | Federal
Operating Loss Carryforwards [Line Items]
Tax credit carryforward	0								0
Research Tax Credit Carryforward | State
Operating Loss Carryforwards [Line Items]
Tax credit carryforward	6,600								6,600
Research and Development Credits
Operating Loss Carryforwards [Line Items]
Valuation allowance	$ 4,300								$ 4,300

Income Tax - Components of (Los

Income Tax - Components of (Loss) Income Before Income Tax Benefit (Provision) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Oct. 01, 2016	Jul. 02, 2016	Apr. 02, 2016	Dec. 26, 2015	Sep. 26, 2015	Jun. 27, 2015	Mar. 28, 2015	Dec. 31, 2016	Dec. 26, 2015	Dec. 27, 2014
Income Tax Disclosure [Abstract]
United States									$ 27,936	$ 10,326	$ (20,682)
Foreign									2,710	1,538	1,026
Income (loss) before income tax benefit (provision)	$ 10,958	$ 10,078	$ 6,060	$ 3,550	$ 7,981	$ 4,353	$ 137	$ (607)	$ 30,646	$ 11,864	$ (19,656)

Income Tax - Components of Inco

Income Tax - Components of Income Tax Benefit (Provision) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Oct. 01, 2016	Jul. 02, 2016	Apr. 02, 2016	Dec. 26, 2015	Sep. 26, 2015	Jun. 27, 2015	Mar. 28, 2015	Dec. 31, 2016	Dec. 26, 2015	Dec. 27, 2014
Federal:
Current									$ (12,166)	$ (4,162)	$ 0
Deferred									30,482	0	(19,504)
State:
Current									(1,225)	(926)	(24)
Deferred									2,610	0	(1,373)
Foreign:
Current									(780)	(661)	(285)
Deferred									(135)	71	52
Total income tax benefit (provision)	$ (4,535)	$ (3,999)	$ 27,899	$ (579)	$ (5,418)	$ (73)	$ (99)	$ (88)	$ 18,786	$ (5,678)	$ (21,134)

Income Tax - Difference Between

Income Tax - Difference Between Income Taxes Computed at Federal Statutory Rate and Income Tax Benefit (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Oct. 01, 2016	Jul. 02, 2016	Apr. 02, 2016	Dec. 26, 2015	Sep. 26, 2015	Jun. 27, 2015	Mar. 28, 2015	Dec. 31, 2016	Dec. 26, 2015	Dec. 27, 2014
Income Tax Disclosure [Abstract]
Federal statutory rate									35.00%	35.00%	35.00%
Effect of:
Tax benefit (provision) at federal statutory rate									$ (10,728)	$ (4,153)	$ 6,881
State tax benefit (provision), net of federal tax benefit (provision)									(1,507)	(405)	515
ESPP									(1,537)	(723)	(1,106)
Other permanent items									(861)	(305)	(215)
Impact of foreign operations									(122)	(8)	132
Tax credits									4,706	3,205	2,106
Change in valuation allowance									28,835	(3,289)	(29,447)
Total income tax benefit (provision)	$ (4,535)	$ (3,999)	$ 27,899	$ (579)	$ (5,418)	$ (73)	$ (99)	$ (88)	$ 18,786	$ (5,678)	$ (21,134)

Income Tax - Components of Defe

Income Tax - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 26, 2015	Dec. 27, 2014
Deferred tax assets:
Stock-based compensation	$ 15,050	$ 12,895
Fixed assets	2,829	3,938
Accruals and reserves	6,288	6,750
Deferred revenue	7,651	4,895
Inventory reserve	1,276	971
Credits	4,304	3,825
Gross deferred tax assets	37,398	33,274
Valuation allowance	(4,304)	(33,139)
Total deferred tax assets	33,094	135
Deferred tax liabilities	0	0
Total	33,094	135
Valuation Allowance of Deferred Tax Assets
Valuation Allowance [Abstract]
Balance at the beginning of period	33,139	27,851	$ 0
Additions	1,621	5,288	27,851
Deductions	(30,456)	0	0
Balance at End of Period	$ 4,304	$ 33,139	$ 27,851

Income Tax - Reconciliation of

Income Tax - Reconciliation of Gross Unrecognized Tax Benefit (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 26, 2015	Dec. 27, 2014
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits at the beginning of the period	$ 3,247	$ 2,258	$ 186
Additions for tax positions related to the current year	2,001	1,424	1,824
Additions for tax positions related to the prior year	0	112	248
Reductions for tax positions related to the prior year	(7)	(547)	0
Unrecognized tax benefits at the end of the period	$ 5,241	$ 3,247	$ 2,258

Net Income (Loss) per Share - C

Net Income (Loss) per Share - Computation of Basic and Diluted Net Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Oct. 01, 2016	Jul. 02, 2016	Apr. 02, 2016	Dec. 26, 2015	Sep. 26, 2015	Jun. 27, 2015	Mar. 28, 2015	Dec. 31, 2016	Dec. 26, 2015	Dec. 27, 2014
Numerator:
Net income (loss)									$ 49,432	$ 6,186	$ (40,790)
Denominator:
Weighted average shares used for basic net income (loss) per share computation									35,431	33,618	32,200
Weighted average effect of dilutive securities:
Stock options									2,212	2,248	0
Weighted average shares used for diluted net income (loss) per share computation									37,643	35,866	32,200
Net income (loss) per share:
Basic (in usd per share)	$ 0.18	$ 0.17	$ 0.97	$ 0.09	$ 0.07	$ 0.13	$ 0	$ (0.02)	$ 1.40	$ 0.18	$ (1.27)
Diluted (in usd per share)	$ 0.17	$ 0.16	$ 0.91	$ 0.08	$ 0.07	$ 0.12	$ 0	$ (0.02)	$ 1.31	$ 0.17	$ (1.27)

Net Income (Loss) per Share - P

Net Income (Loss) per Share - Polentially Dilutive Securities Excluded from Computation of Diluated Net Income (Loss) Per Common Stock (Details) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 26, 2015	Dec. 27, 2014
Option Plans Awards To Purchase Common Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of diluted net income per unit (in shares)	125	654	6,339

Segment Information - Additiona

Segment Information - Additional Information (Details)	12 Months Ended
	Dec. 31, 2016Segment
Segment Reporting [Abstract]
Number of segments	1

Segment Information - Revenue a

Segment Information - Revenue and Long-lived Assets by Geographic Region (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Oct. 01, 2016	Jul. 02, 2016	Apr. 02, 2016	Dec. 26, 2015	Sep. 26, 2015	Jun. 27, 2015	Mar. 28, 2015	Dec. 31, 2016	Dec. 26, 2015	Dec. 27, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 85,029	$ 83,512	$ 75,103	$ 67,211	$ 67,024	$ 56,652	$ 51,446	$ 46,853	$ 310,855	$ 221,975	$ 157,130
Long-lived assets	11,809				9,416				11,809	9,416
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue									240,649	163,283	116,921
Long-lived assets	9,907				9,148				9,907	9,148
Rest of Americas
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue									9,791	10,696	8,499
Europe, Middle East and Africa
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue									37,004	32,167	21,769
Asia Pacific
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue									23,411	15,829	$ 9,941
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 1,902				$ 268				$ 1,902	$ 268

Subsequent Event (Details)

Subsequent Event (Details) - Subsequent Event - USD ($) $ in Millions	Feb. 16, 2017	Feb. 03, 2017
Subsequent Event [Line Items]
Letters of credit outstanding, amount	$ 0.8
Credit fee percentage	0.75%
2013 Equity Plan
Subsequent Event [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Additional Shares Registered		1,464,740
Employee stock
Subsequent Event [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Additional Shares Registered		439,422

Quarterly Financial Informati66

Quarterly Financial Information - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Oct. 01, 2016	Jul. 02, 2016	Apr. 02, 2016	Dec. 26, 2015	Sep. 26, 2015	Jun. 27, 2015	Mar. 28, 2015	Dec. 31, 2016	Dec. 26, 2015	Dec. 27, 2014
Revenue:
Product	$ 59,430	$ 59,835	$ 51,308	$ 44,662	$ 47,051	$ 38,717	$ 34,814	$ 32,152	$ 215,235	$ 152,734	$ 105,594
Service	25,599	23,677	23,795	22,549	19,973	17,935	16,632	14,701	95,620	69,241	51,536
Total revenue	85,029	83,512	75,103	67,211	67,024	56,652	51,446	46,853	310,855	221,975	157,130
Cost of revenue:
Product	11,615	12,197	11,510	10,707	10,262	9,613	9,558	9,445	46,029	38,878	31,001
Service	2,210	2,141	2,339	2,082	1,669	1,708	1,763	1,777	8,772	6,917	6,447
Total cost of revenue	13,825	14,338	13,849	12,789	11,931	11,321	11,321	11,222	54,801	45,795	37,448
Gross profit	71,204	69,174	61,254	54,422	55,093	45,331	40,125	35,631	256,054	176,180	119,682
Research and development	17,170	18,306	17,250	15,358	13,171	12,677	12,227	11,496	68,084	49,571	42,806
Sales and marketing	34,167	31,994	28,843	27,657	26,150	21,388	21,171	18,832	122,661	87,541	76,063
General and administrative	8,869	8,887	9,147	7,995	7,788	6,950	6,702	6,019	34,898	27,459	20,683
Total operating expenses	60,206	59,187	55,240	51,010	47,109	41,015	40,100	36,347	225,643	164,571	139,552
Income (loss) from operations	10,998	9,987	6,014	3,412	7,984	4,316	25	(716)	30,411	11,609	(19,870)
Interest income	265	235	219	207	116	106	105	119	926	446	308
Other expense, net	(305)	(144)	(173)	(69)	(119)	(69)	7	(10)	(691)	(191)	(94)
Income (loss) before income tax benefit (provision)	10,958	10,078	6,060	3,550	7,981	4,353	137	(607)	30,646	11,864	(19,656)
Income tax benefit (provision)	(4,535)	(3,999)	27,899	(579)	(5,418)	(73)	(99)	(88)	18,786	(5,678)	(21,134)
Net Income (loss)	$ 6,423	$ 6,079	$ 33,959	$ 2,971	$ 2,563	$ 4,280	$ 38	$ (695)	$ 49,432	$ 6,186	$ (40,790)
Net income (loss) per share:
Basic (in usd per share)	$ 0.18	$ 0.17	$ 0.97	$ 0.09	$ 0.07	$ 0.13	$ 0	$ (0.02)	$ 1.40	$ 0.18	$ (1.27)
Diluted (in usd per share)	$ 0.17	$ 0.16	$ 0.91	$ 0.08	$ 0.07	$ 0.12	$ 0	$ (0.02)	$ 1.31	$ 0.17	$ (1.27)