Quantenna Communications (QTNA) 10-Q 7 Nov 17 2017 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Oct. 01, 2017	Nov. 03, 2017
Document and Entity Information [Abstract]
Entity Registrant Name	QUANTENNA COMMUNICATIONS INC
Entity Central Index Key	1,370,702
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Document Type	10-Q
Document Period End Date	Oct. 1, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q3
Amendment Flag	false
Entity common stock, shares outstanding		35,220,966

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Oct. 01, 2017	Jan. 01, 2017
Current assets
Cash and cash equivalents	$ 38,844	$ 117,045
Marketable securities	88,022	0
Accounts receivable	22,820	14,480
Inventory	23,700	15,820
Prepaid expenses and other current assets	2,444	2,470
Total current assets	175,830	149,815
Property and equipment, net	11,215	4,742
Intangible assets, net	3,259	0
Other long-term assets	1,037	232
Total assets	191,341	154,789
Current liabilities
Accounts payable	12,918	7,776
Accrued liabilities and other current liabilities	27,941	11,801
Long-term debt, current portion	2,487	2,257
Total current liabilities	43,346	21,834
Long-term debt	1,900	3,680
Other long-term liabilities	3,413	527
Total liabilities	48,659	26,041
Commitments and contingencies (see Note 6)
Stockholders’ equity
Common stock: $0.0001 par value, 1,000,000,000 shares authorized at October 1, 2017 and January 1, 2017, 35,084,934 and 33,076,150 shares issued and outstanding at October 1, 2017 and January 1, 2017, respectively	3	3
Additional paid-in capital	302,240	290,319
Accumulated other comprehensive loss	(20)	0
Accumulated deficit	(159,541)	(161,574)
Total stockholders’ equity	142,682	128,748
Total liabilities and stockholders’ equity	$ 191,341	$ 154,789

Condensed Consolidated Balance3

Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Oct. 01, 2017	Jan. 01, 2017
Statement of Financial Position [Abstract]
Common stock, par value (usd per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)	1,000,000,000	1,000,000,000
Common stock, shares issued (in shares)	35,084,934	33,076,150
Common stock, shares outstanding (in shares)	35,084,934	33,076,150

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 01, 2017	Sep. 25, 2016	Oct. 01, 2017	Sep. 25, 2016
Income Statement [Abstract]
Revenue	$ 50,108	$ 34,105	$ 135,084	$ 91,577
Cost of revenue	25,591	17,247	68,212	46,452
Gross profit	24,517	16,858	66,872	45,125
Operating expenses:
Research and development	15,011	11,162	43,699	32,913
Sales and marketing	3,363	2,172	9,553	5,571
General and administrative	3,735	3,248	11,231	7,802
Total operating expenses	22,109	16,582	64,483	46,286
Income (loss) from operations	2,408	276	2,389	(1,161)
Interest expense	(103)	(189)	(442)	(414)
Other income (expense), net	223	(52)	610	(300)
Income (loss) before income taxes	2,528	35	2,557	(1,875)
Benefit (provision) for income taxes	274	(14)	(470)	(52)
Net income (loss)	$ 2,802	$ 21	$ 2,087	$ (1,927)
Net income (loss) per share:
Basic (usd per share)	$ 0.08	$ 0.02	$ 0.06	$ (1.84)
Diluted (usd per share)	$ 0.07	$ 0	$ 0.05	$ (1.84)
Weighted average shares used to compute basic and diluted net income (loss) per share:
Basic (in shares)	34,734	1,157	33,907	1,048
Diluted (in shares)	38,525	29,974	38,419	1,048

Condensed Consolidated Stateme5

Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 01, 2017	Sep. 25, 2016	Oct. 01, 2017	Sep. 25, 2016
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 2,802	$ 21	$ 2,087	$ (1,927)
Other comprehensive loss, net of tax:
Unrealized gains (losses) on available-for-sale marketable securities	12	0	(20)	0
Comprehensive income (loss)	$ 2,814	$ 21	$ 2,067	$ (1,927)

Condensed Consolidated Stateme6

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Oct. 01, 2017	Sep. 25, 2016
Cash flows from operating activities
Net loss	$ 2,087	$ (1,927)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	1,566	880
Stock-based compensation expense	7,447	2,224
Accretion of discount on investments	93	0
Non-cash interest expense, net	254	140
Change in fair value of convertible preferred stock warrants liability	0	109
Changes in assets and liabilities:
Accounts receivable	(8,340)	(1,589)
Inventory	(7,880)	(2,861)
Prepaid expenses and other current assets	(22)	(283)
Deferred rent and other assets	(790)	16
Accounts payable	5,119	(1,136)
Accrued liabilities and other current liabilities	14,660	6,136
Net cash provided by operating activities	14,194	1,709
Cash flows from investing activities
Purchase of property and equipment	(6,961)	(1,621)
Purchase of marketable securities	(104,044)	0
Proceeds from sales of marketable securities	3,670	0
Maturities of marketable securities	12,239	0
Restricted cash	0	(1,559)
Net cash used in investing activities	(95,096)	(3,180)
Cash flows from financing activities
Proceeds from issuance of common stock	4,553	785
Payments of offering costs	(96)	(881)
Proceeds from revolving line of credit, net of fees paid	0	2,950
Repayment of revolving line of credit	0	(3,000)
Proceeds from issuance of long-term debt, net of fees paid	0	3,854
Repayments of long-term debt	(1,756)	(3,265)
Net cash provided by financing activities	2,701	443
Net decrease in cash and cash equivalents	(78,201)	(1,028)
Beginning of period	117,045	18,850
End of period	38,844	17,822
Supplemental disclosure of cash flow information
Interest paid during the period	342	419
Income taxes paid during the period	746	87
Supplemental disclosure of non-cash investing and financing activities
Unpaid offering costs	254	1,396
Purchases of property and equipment included in accounts payable and accrued liabilities and other current liabilities	280	18
Issuance of warrants in conjunction with the execution of debt agreement	$ 0	$ 96

The Company and Summary of Sign

The Company and Summary of Significant Accounting Policies	9 Months Ended
	Oct. 01, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
The Company and Summary of Significant Accounting Policies	The Company and Summary of Significant Accounting Policies Quantenna Communications, Inc. (the “Company”) was incorporated in the State of Delaware on November 28, 2005. The Company designs, develops and markets advanced high-speed wireless communication solutions enabling wireless local area networking. The Company’s wireless communication solutions deliver high performance, speed, and reliability for wireless networks and devices. Reporting Calendar The Company prepares financial statements on a 52- or 53-week fiscal year that ends on the Sunday closest to December 31. Fiscal 2017 will have 52 weeks and fiscal 2016 had 53 weeks. In a 52-week year, each fiscal quarter consists of 13 weeks. Fiscal 2017 will end on December 31, 2017. Initial Public Offering On October 27, 2016, the Company’s registration statement on Form S-1 relating to its initial public offering (“IPO”) of its common stock was declared effective by the U.S. Securities and Exchange Commission (“SEC”) and the shares of its common stock began trading on the NASDAQ Global Select Market on October 28, 2016. The public offering price of the shares sold in the IPO was $16.00 per share. The IPO closed on November 2, 2016 and a second close occurred on November 25, 2016 , pursuant to which the Company sold 6,775,466 shares of common stock, including the sale of 75,466 shares of common stock to the underwriters upon their exercise of their option to purchase additional shares. The Company received net proceeds of approximately $97.4 million , after underwriting discounts, commissions and offering expenses. Immediately prior to the consummation of the IPO, all outstanding shares of convertible preferred stock and preferred stock warrants were converted into common stock and common stock warrants, respectively. Unaudited Interim Financial Information The accompanying interim condensed consolidated financial statements and related disclosures are unaudited and in the opinion of management, reflect all adjustments, which include only normal recurring adjustments, necessary for a fair statement of the results of operations for the periods presented. The year-end condensed consolidated balance sheet data was derived from audited financial statements, but does not include all disclosures required by accounting principles generally accepted in the United States of America (“US GAAP”). The condensed consolidated results of operations for the three and nine months ended October 1, 2017 are not necessarily indicative of the results to be expected for the full year or for any other future year or interim period. The accompanying condensed consolidated financial statements should be read in conjunction with the audited financial statements and the related notes thereto included in the Company’s Annual Report on Form 10-K for the fiscal year ended January 1, 2017 filed with the SEC on March 1, 2017 (“2016 Annual Report on Form 10-K”). Use of Estimates Preparation of financial statements in conformity with US GAAP requires management to make 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 reported amounts of revenue and expenses during the reporting periods covered by the financial statements and accompanying notes. Actual results could differ from those estimates. Principles of Consolidation The condensed consolidated financial statements include the accounts of the Company and its wholly owned subsidiaries. All intercompany transactions and balances have been eliminated in consolidation. Significant Accounting Policies During the three and nine months ended October 1, 2017 , there have been no changes in our significant accounting policies as described in the Company’s 2016 Annual Report on Form 10-K, except as discussed below: Stock-based compensation The Company measures and recognizes compensation expense for all stock-based awards made to employees, directors and non-employees, based on estimated fair values recognized using the straight-line method over the requisite service period. On January 1, 2017, the Company adopted the Financial Accounting Standards Board (“FASB”) Accounting Standards Update (“ASU”) 2016-09, Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting . Under this guidance, the Company elected the option to no longer apply a forfeiture rate to the stock-based compensation expense, but to record forfeitures when they occur, and, as a result, under the modified retrospective method of adoption the Company recorded an immaterial cumulative effect adjustment of $54,000 to the opening accumulated deficit on January 2, 2017. Marketable Securities Marketable securities consist primarily of highly liquid investments with maturities of greater than 90 days when purchased. We generally classify our marketable securities at the date of acquisition as available-for-sale. These securities are reported at fair value with the related unrealized gains and losses included in " Accumulated other comprehensive loss ", a component of stockholders’ equity, net of tax. Any unrealized losses which are considered to be other-than-temporary impairments are recorded in " Other income (expense), net " in the Condensed Consolidated Statements of Operations. Realized gains (losses) on the sale of marketable securities are determined using the specific-identification method and recorded in " Other income (expense), net " in the Consolidated Statements of Operations. All of our available-for-sale investments are subject to a periodic impairment review. We record a charge to earnings when a decline in fair value is significantly below cost basis and judged to be other-than-temporary, or have other indicators of impairments. If the fair value of an available-for-sale investment is less than its amortized cost basis, an other-than-temporary impairment is triggered in circumstances where (1) we intend to sell the instrument, (2) it is more likely than not that we will be required to sell the instrument before recovery of its amortized cost basis or (3) a credit loss exists where we do not expect to recover the entire amortized cost basis of the instrument. If we intend to sell or it is more likely than not that we will be required to sell the available-for-sale investment before recovery of its amortized cost basis, we recognize an other-than temporary impairment charge equal to the entire difference between the investment's amortized cost basis and its fair value. Intangible Assets On September 29, 2017, the Company entered into a three -year software license contract with Cadence Design Systems, Inc. (“Cadence”), a related party, for the use of various Engineering Design Aid (“EDA”) software tools used for its research and development efforts. The license payments will be made and amortized over 12 quarterly periods amounting to approximately $3.3 million . In addition, the Company also contracted with Cadence for ongoing maintenance support which will be recognized ratably over the contractual term and amount to approximately $1.2 million The Company has classified these licenses as definite long-lived intangible assets in its Condensed Consolidated Balance Sheets as of October 1, 2017 . Definite long-lived intangible assets consist of software licenses which are recorded based on the total contractual price. Such assets are amortized over its contractual lives and are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. If it is determined that such assets are not recoverable, an impairment charge is recognized for the amount by which the carrying amount of such assets exceeds their fair values. There was no impairment of definite long-lived intangible assets for any periods presented.

Recent Accounting Pronouncement

Recent Accounting Pronouncements	9 Months Ended
	Oct. 01, 2017
Accounting Policies [Abstract]
Recent Accounting Pronouncements	Recent Accounting Pronouncements In May 2017, the FASB issued ASU No. 2017-09, Compensation-Stock Compensation (Topic 718): Scope of Modification Accounting (“ASU No 2017-09”). The amendments in ASU No. 2017-09 provide guidance about which changes to the terms or conditions of a share-based payment award require an entity to apply modification accounting in Topic 718. ASU No. 2017-09 is effective for the Company for annual and interim reporting periods beginning January 1, 2018. Early adoption of ASU No. 2017-09 is permitted, including adoption in any interim period, and the standard should be applied prospectively to an award modified on or after the adoption date. The adoption of this standard is not expected to have a material impact on the Company’s consolidated financial statements. In November 2016, the FASB issued ASU No. 2016-18, Statement of Cash Flows - Restricted Cash , which requires entities to show the changes in the total of cash, cash equivalents, restricted cash and restricted cash equivalents in the statement of cash flow. This standard is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. Early adoption is permitted, including adoption in an interim period, but any adjustments must be reflected as of the beginning of the fiscal year that includes that interim period. The new standard must be adopted retrospectively. The adoption of this standard is not expected to have a material impact on the Company’s consolidated statements of cash flows. In October 2016, the FASB issued ASU No. 2016-17, Consolidation - Interests Held through Related Parties That Are under Common Control , to amend the consolidation guidance on how a reporting entity that is the single decision maker of a variable interest entity should treat indirect interests in the entity held through related parties that are under common control within the reporting entity when determining whether it is the primary beneficiary of that variable interest entity. The standard is effective for fiscal years beginning after December 15, 2016, including interim periods within those fiscal years. Early adoption is permitted. The adoption of this standard did not have a material impact on the Company’s consolidated financial position and results of operations. In October 2016, the FASB issued ASU No. 2016-16, Income Taxes - Intra-Entity Transfers of Assets Other Than Inventory , which requires entities to recognize the income tax consequences of an intra-entity transfer of an asset other than inventory when the transfer occurs. The standard is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. Early adoption is permitted as of the beginning of a fiscal year. The new standard must be adopted using a modified retrospective transition method which is a cumulative-effective adjustment to retained earnings as of the beginning of the first effective reporting period. The Company is currently evaluating the effects, if any, that the adoption of this guidance will have on its consolidated financial statements. In August 2016, the FASB issued ASU No. 2016-15, Statement of Cash Flows - Classification of Certain Cash Receipts and Cash Payments , ASU No. 2016-15 addresses eight specific cash flow issues with the objective of reducing the existing diversity in practice in how certain cash receipts and cash payments are presented and classified in the statement of cash flows. The standard is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. Early adoption is permitted, including adoption in an interim period. The adoption of this standard is not expected to have a material impact on the Company’s consolidated statements of cash flows. In February 2016, the FASB issued ASU No. 2016-02, Leases (“ASC 842”), which sets out the principles for the recognition, measurement, presentation and disclosure of leases for both parties to a contract (i.e., lessees and lessors). The new standard requires lessees to apply a dual approach, classifying leases as either finance or operating leases based on the principle of whether or not the lease is effectively a financed purchase by the lessee. This classification will determine whether lease expense is recognized based on an effective interest method or on a straight-line basis over the term of the lease, respectively. A lessee is also required to record a right-of-use asset and a lease liability for all leases with a term of greater than twelve months regardless of their classification. Leases with a term of twelve months or less will be accounted for similar to existing guidance for operating leases today. ASC 842 supersedes the previous leases standard, ASC 840 Leases . The standard is effective on January 1, 2019, with early adoption permitted. The Company is currently evaluating the effects, if any, that the adoption of this guidance will have on its consolidated financial statements. In January 2016, the FASB issued ASU No. 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities , which addresses certain aspects of recognition, measurement, presentation and disclosure of financial instruments. ASU No. 2016-01 is effective for annual periods, and interim periods within those annual periods, beginning after December 15, 2017. The adoption of this standard is not expected to have a material impact on the Company’s consolidated financial statements. In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606) , which supersedes the revenue recognition requirements in ASC 605, Revenue Recognition . This ASU No. 2014-09 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. The ASU No. 2014-09 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, FASB issued ASU No. 2015-14, Revenue from Contracts with Customers (Topic 606): Deferral of the Effective Date , which effectively delayed the adoption date by one year, to an effective date for public entities for annual and interim periods beginning after December 15, 2017. In March, April, May and December 2016, the FASB issued additional updates to the new revenue standard relating to reporting revenue on a gross versus net basis, identifying performance obligations and licensing arrangements, and narrow-scope improvements and practical expedients, respectively. The effective date of this additional update is the same as that of ASU No. 2014-09. The guidance permits the use of either a retrospective or cumulative effect transition method. The Company has not yet selected a transition method. The Company is still finalizing the analysis to quantify the adoption impact of the provisions of the new standard, but it does not currently expect it to have a material impact on its consolidated financial position or results of operations. Based on the evaluation of its current contracts and revenue streams, revenue will be recorded consistently under both the current and new standard. The FASB has issued, and may issue in the future, interpretive guidance which may cause the Company’s evaluation to change. The Company believes it is following an appropriate timeline to allow for proper recognition, presentation and disclosure upon adoption effective the beginning of fiscal year 2018.

Earnings Per Share

Earnings Per Share	9 Months Ended
	Oct. 01, 2017
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share The following table summarizes the Company’s computation of basic and diluted net income (loss) per share attributable to common stockholders of the Company: Three Months Ended Nine Months Ended October 1, September 25, October 1, September 25, (in thousands, except per share data) Net income (loss) $ 2,802 $ 21 $ 2,087 $ (1,927 ) Weighted-average shares outstanding 34,780 1,227 33,960 1,175 Less: weighted average shares subject to repurchase due to early exercise (46 ) (70 ) (53 ) (127 ) Weighted average shares used to compute basic net income (loss) per share 34,734 1,157 33,907 1,048 Dilutive effect of convertible preferred stock, warrants to purchase preferred stock, stock options, common stock warrants, ESPP and RSUs 3,791 28,817 4,512 — Weighted average shares used to compute diluted net income (loss) per share 38,525 29,974 38,419 1,048 Net income (loss) per share: Basic $ 0.08 $ 0.02 $ 0.06 $ (1.84 ) Diluted $ 0.07 ​ $ 0.00 $ 0.05 $ (1.84 ) The following potentially dilutive securities outstanding at the end of the periods have been excluded from the computation of diluted shares outstanding as the effect would have been anti-dilutive: Three Months Ended Nine Months Ended October 1, September 25, October 1, September 25, (in thousands) Convertible preferred stock (as-converted) — 24,790 — 24,790 Warrants to purchase convertible preferred stock — — — 39 Warrants to purchase common stock — — — 439 Restricted Stock Units (“RSUs”) 104 — 881 — Options to purchase common stock 672 1,625 672 6,640 Total 776 26,415 1,553 31,908

Balance Sheets Components

Balance Sheets Components	9 Months Ended
	Oct. 01, 2017
Balance Sheets Components [Abstract]
Balance Sheets Components	Balance Sheets Components Marketable Securities Marketable securities at October 1, 2017 consisted of the following: Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value (in thousands) Corporate debt securities $ 81,438 $ 19 $ (36 ) $ 81,421 Government debt securities 6,604 — (3 ) 6,601 $ 88,042 $ 19 $ (39 ) $ 88,022 The contractual maturities of marketable securities as of October 1, 2017 were as follows: Amortized Cost Fair Value (in thousands) Due in one year or less $ 40,663 $ 40,652 Due after one year to five years 47,379 47,370 $ 88,042 $ 88,022 There were no marketable securities as of January 1, 2017 . Property and Equipment, Net Property and equipment, net consisted of the following: October 1, January 1, (in thousands) Computer and lab equipment $ 13,342 $ 9,748 Computer software 795 625 Furniture and fixtures 203 136 Leasehold improvements 342 218 Sub-total 14,682 10,727 Accumulated depreciation and amortization (7,550 ) (5,985 ) Net long-lived assets $ 7,132 $ 4,742 Construction-in-progress 4,083 — Total $ 11,215 $ 4,742 Depreciation and amortization expense related to property and equipment was $0.5 million and $0.3 million , respectively, for the three months ended October 1, 2017 and September 25, 2016 , and $1.6 million and $0.9 million , respectively, for the nine months ended October 1, 2017 and September 25, 2016 . Inventory Inventory consisted of the following: October 1, January 1, (in thousands) Raw materials $ 17,478 $ 9,067 Work in progress 2,626 1,128 Finished goods 3,596 5,625 $ 23,700 $ 15,820 Accrued Liabilities and Other Current Liabilities Accrued liabilities and other current liabilities consisted of the following: October 1, January 1, (in thousands) Accrued payroll and related benefits $ 3,421 $ 2,842 Accrued customer rebates 12,452 3,026 Accrual for inventory purchases 1,913 1,353 Accrued expenses 6,763 2,952 ESPP employee contributions 1,719 665 Other 1,673 963 $ 27,941 $ 11,801

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Oct. 01, 2017
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements The Company determines fair value measurements used in its consolidated financial statements based upon the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. The fair value hierarchy distinguishes between (i) market participant assumptions developed based on market data obtained from independent sources (observable inputs) and (ii) an entity’s own assumptions about market participant assumptions developed based on the best information available in the circumstances (unobservable inputs). The fair value hierarchy consists of three broad levels, which gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1) and the lowest priority to unobservable inputs (Level 3). The three levels of the fair value hierarchy are described below: Level 1: Valuations based on quoted prices in active markets for identical assets or liabilities that the entity has the ability to access. Level 2: Valuations based on quoted prices for similar assets or liabilities, quoted prices in markets that are not active, or other inputs that are observable or can be corroborated by observable data for substantially the full term of the assets or liabilities. Level 3: Valuations based on inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. We obtain the fair value of our Level 1 investments in money market funds, at the expected market price. These investments are expected to maintain a net asset value of $1 per share. We determine the fair value of our Level 2 financial instruments from third-party asset managers, custodian banks, and the accounting service providers. We classify financial instruments in Level 3 of the fair value hierarchy when there is reliance on at least one significant unobservable input to the valuation model. In addition to these unobservable inputs, the valuation models for Level 3 financial instruments typically also rely on a number of inputs that are readily observable, either directly or indirectly. The Company’s assessment of the significance of a particular input to the fair value measurement in its entirety requires management to make judgments and consider factors specific to the asset or liability. There were no assets or liabilities in Level 3 of the fair value hierarchy and there were no transfers between Level 1 and Level 2 categories during any of the periods presented. We utilize the market approach to measure the fair value of our fixed income securities. The market approach is a valuation technique that uses prices and other relevant information generated by market transactions involving identical or comparable assets or liabilities. The fair value of our fixed income securities is obtained using readily-available market prices from a variety of industry standard data providers, large financial institutions and other third-party sources for the identical underlying securities. Assets Measured at Fair Value on a Recurring Basis We measure and report certain assets at fair value at October 1, 2017 on a recurring basis as follows: Fair Value as of October 1, 2017 Level 1 Level 2 Level 3 Total Assets: (in thousands) Cash equivalents: Money market funds $ 4,173 $ — $ — $ 4,173 Corporate debt securities — 5,989 — 5,989 Government debt securities — 2,299 — 2,299 Total cash equivalents 4,173 8,288 — 12,461 Marketable Securities: — Corporate debt securities — 81,421 — 81,421 Government debt securities — 6,601 — 6,601 Total marketable securities — 88,022 — 88,022 Total cash equivalents and marketable securities $ 4,173 $ 96,310 $ — $ 100,483 The Level 1 assets consist of money market funds. The Level 2 assets consist of available-for-sale investment portfolio, which are valued utilizing a market approach. At January 1, 2017 , highly liquid money market funds of $100.9 million , respectively, were valued using Level 1 of the fair value hierarchy, quoted prices in active markets for identical assets and were included in cash equivalents. Common Stock Warrants As of October 1, 2017 , warrants issued and outstanding were as follows: Date of Issuance Number of Warrants Exercise Price Expiration Date Common stock warrants September 2015 83,006 $ 2.50 February 2019 As of January 1, 2017 , warrants issued and outstanding were as follows: Date of Issuance Number of Warrants Exercise Price Expiration Date Common stock warrants October 2013 38,748 $ 7.74 October 2023 Common stock warrants September 2015 283,005 $ 2.50 February 2019 Common stock warrants February 2016 20,251 $ 4.00 February 2019 Common stock warrants February 2016 9,000 $ 0.05 January 2018 Common stock warrants May 2016 126,400 $ 4.00 May 2026 During the nine months ended October 1, 2017 , common stock warrants issued in a) October 2013 to a lender of the Company at $7.74 per share was exercised, b) September 2015 to an investor of the Company was partially exercised at $2.50 per share, c) February 2016 at $4.00 per share was exercised, d) February 2016 to a service provider of the Company were exercised at $0.05 per share, and e) May 2016 to a lender of the Company at $4.00 per share were partially exercised and the remainder were canceled.

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Oct. 01, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Leases The Company conducts its operations using leased office facilities in various locations. The following is a schedule of future minimum lease payments under operating leases as of October 1, 2017 (in thousands): 2017 (remaining three months) $ 205 2018 2,028 2019 2,261 2020 2,036 2021 1,628 2022 and beyond 3,728 Total minimum lease payments $ 11,886 The Company leases office space under arrangements expiring through 2026. Rent expense for the three months ended October 1, 2017 and September 25, 2016 was $0.4 million and $0.3 million respectively. Rent expense for the nine months ended October 1, 2017 and September 25, 2016 was $1.2 million and $0.9 million , respectively. In February 2017, the Company entered into a new lease agreement for its corporate headquarters located in San Jose, California consisting of approximately 84,000 square feet. The lease term is 76 months commencing on October 16, 2017 and expiring in 2024. Purchase Commitments The Company has purchase obligations of $30.0 million that are based on outstanding purchase orders as of October 1, 2017 , related to the fabrication of certain wafers for which production has started. These purchase orders are cancellable at any time, provided that the Company is required to pay all costs incurred through the cancellation date. Historically, the Company has rarely canceled these agreements once production has started. The Company did not otherwise have any outstanding non-cancellable purchase obligations as of October 1, 2017 . Indemnification In connection with the sale of its semiconductor products, the Company executes standard software license agreements allowing customers to use its firmware. Under the indemnification clauses of these license agreements, the Company agrees to defend the licensee against third-party claims asserting infringement by the Company’s products of certain intellectual property rights, which may include patents, copyrights, trademarks or trade secrets, and to pay any judgments entered on such claims against the licensee, subject to certain restrictions and limitations. The Company has never incurred significant expense defending its licensees against third-party claims. Further, the Company has never incurred significant expense under its standard product or services performance warranties. As a result, the Company believes the estimated fair value of these agreements is minimal. Accordingly, the Company has no liabilities recorded for these agreements at October 1, 2017 . Commitments In April 2012, an agreement was entered into with Joint Stock Company “RUSNANO” (formerly Open Joint Stock Company “RUSNANO”), which required the Company to form a wholly-owned subsidiary in the Russian Federation and to provide funding to the subsidiary in the three years following April 16, 2012. This wholly-owned subsidiary performs research and development activities for the Company. Funding means cash transfers to the subsidiary for equity investments, reimbursements of subsidiary operating expenses and Company expenses related to the subsidiary. RUSNANO also requires participation in subsidiary financial decisions. In July 2014, the Company entered into an amended and restated letter agreement with RUSNANO pursuant to which the Company agreed, among other matters, to operate and fund its Russian operations in an aggregate amount of $13.0 million over six annual periods beginning on December 31, 2014. The annual funding requirements in period one to period six are $2.2 million , $1.7 million , $2.0 million , $2.2 million , $2.4 million , and $2.5 million , respectively. In the event that the Company fails to meet its funding obligations for any period, it will be required to pay RUSNANO a penalty fee of 10% on 80% of the difference between the funding obligation and the actual funding for that period, subject to a cure period of one calendar quarter after the applicable period funding deadline. As of October 1, 2017 , the Company had met the minimum funding requirements and no penalty had been incurred. Legal Matters From time to time, the Company is a party to litigation and subject to claims incident to the ordinary course of business, including intellectual property claims, labor and employment claims, breach of contract claims, and other matters. Significant judgment is required when we assess the likelihood of any adverse judgments or outcomes to a potential claim or legal proceeding, as well as potential ranges of probable losses, and when the outcomes of the claims or proceedings are probable and reasonably estimable. Because of uncertainties related to these matters, we base our estimates on the information available at the time. As additional information becomes available, we reassess the potential liability related to pending claims and litigation, and may revise our estimates. Any revisions in the estimates of potential liabilities could have a material impact on the Company’s results of operations, financial position, and cash flows. In October 2016, Innovatio IP Ventures, LLC filed suit in the United States District Court for the Northern District of Illinois alleging infringement by the Company of nine expired U.S. patents. The complaint seeks unspecified damages. The lawsuit is in the early stages and the Company has not accrued for a loss relating to such matter because the Company believes that, although an unfavorable outcome may be possible, it is not considered at this time to be probable and the loss or range of loss is not reasonably estimable.

Long-term Debt

Long-term Debt	9 Months Ended
	Oct. 01, 2017
Debt Disclosure [Abstract]
Long-term Debt	Long-term Debt Loan and Security Agreement The Company’s Amended and Restated Loan and Security Agreement with Silicon Valley Bank (“SVB”) (the “SVB Loan and Security Agreement”) includes (i) term loans, (ii) revolving line of credit, and (iii) Mezzanine Loan. The term loans have interest at a floating rate per annum equal to prime plus 0.75% . The revolving line of credit has interest between 4.25% to 5.00% depending on the Company’s consolidated leverage ratio. The Mezzanine Loan remained unused by the Company and was canceled upon its expiration in May 2017. The outstanding balance on the term loans was $4.4 million as of October 1, 2017 . The Company has an undrawn balance on the revolving line of credit of $20.0 million which can be drawn subject to 80% of eligible accounts receivable. The agreement contains usual and customary events of default upon the occurrence of certain events, such as nonpayment of amounts due under the revolving line of credit or the term loans, violation of the restrictive covenants, violation of other contractual provisions, or a material adverse change in its business. The agreement includes customary administrative covenants, including a prohibition on declaring dividends, but does not include any financial maintenance or operating related covenants. The SVB Loan and Security Agreement is collateralized by certain of the Company’s assets, including pledges of certain of the Company’s equity interests in its subsidiaries, receivables and inventory, subject to customary exceptions and limits. The SVB Loan and Security Agreement contains customary events of default upon the occurrence of certain events, such as nonpayment of amounts due under the revolving line of credit or the term loans, violation of restrictive covenants, violation of other contractual provisions, or a material adverse change in the Company’s business. In addition, the credit facilities prohibit the payment of cash dividends on the Company’s capital stock and also place restrictions on mergers, sales of assets, investments, incurrence of liens, incurrence of indebtedness and transactions with affiliates. The SVB Loan and Security Agreement has certain prepayment premium upon repayment before the maturity date. As of October 1, 2017 , future minimum payments for the long-term debt are as follows (in thousands): Long-term debt 2017 $ 694 2018 2,383 2019 1,618 Total minimum payments 4,695 Less: Amount representing interest (185 ) Less: Amount representing closing and repayment fees (210 ) Present value of minimum payments 4,300 Less: Unamortized debt discounts (66 ) Plus: Accretion of closing and repayment fees 153 Long-term debt, net 4,387 Less: Long-term debt, current portion (2,487 ) Non-current portion of long-term debt $ 1,900

Stockholders_ Equity

Stockholders’ Equity	9 Months Ended
	Oct. 01, 2017
Equity [Abstract]
Stockholders' Equity	Stockholders’ Equity Common Stock The Company’s Certificate of Incorporation, as amended, authorizes the Company to issue 1,000,000,000 shares of $0.0001 par value common stock. Each share of common stock is entitled to one vote. The holders of common stock are also entitled to receive dividends whenever funds are legally available and when and if declared by the board of directors, subject to the prior rights of holders of all classes of preferred stock outstanding. The Company has never declared any dividends. The Company had reserved shares of common stock for issuance, on an as-converted basis, as follows: October 1, 2017 Options issued and outstanding 5,445,007 RSUs issued and outstanding 888,359 Common stock warrants 83,006 Shares available for ESPP 1,835,341 Shares available for future stock awards 2,973,747 11,225,460 During the nine months ended October 1, 2017 , the Company granted 1,041,629 RSUs to employees and 516,750 options. There were no RSUs granted and 233,775 options granted during the nine months ended September 25, 2016 . Options Subject to Repurchase The Company has a right of repurchase with respect to unvested shares issued upon early exercise of options at an amount equal to the lower of (i) the exercise price of each restricted share being repurchased and (ii) the fair market value of such restricted share at the time the Company’s right of repurchase is exercised. The Company’s right to repurchase these shares lapses as to 1/36th of the total number of shares originally granted per month for 36 months . At October 1, 2017 , 44,000 shares remained subject to the Company’s right of repurchase. The shares purchased by employees pursuant to the early exercise of stock options are not deemed, for accounting purposes, to be issued until those shares vest according to their respective vesting schedules. The cash received in exchange for unvested shares of early exercised stock options is recorded as an early exercise liability on the balance sheets and will be transferred to common stock and additional paid-in capital as such shares vest.

Stock-based Compensation

Stock-based Compensation	9 Months Ended
	Oct. 01, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-based Compensation	Stock-based Compensation Total stock-based compensation expense for employees and non-employees recognized in the condensed consolidated statements of operations was as follows: Three Months Ended Nine Months Ended October 1, September 25, October 1, September 25, (in thousands) Cost of revenue $ 38 $ 9 $ 123 $ 15 Research and development 1,367 231 3,986 454 Sales and marketing 416 60 1,179 120 General and administrative 948 734 2,159 1,635 Total stock-based compensation expense $ 2,769 $ 1,034 $ 7,447 $ 2,224 The above stock-based compensation expense related to the following equity-based awards: Three Months Ended Nine Months Ended October 1, September 25, October 1, September 25, (in thousands) Stock options $ 858 $ 1,034 $ 2,539 $ 2,224 RSU awards 1,603 — 3,553 — ESPP shares 308 — 1,355 — Total stock-based compensation expense $ 2,769 $ 1,034 $ 7,447 $ 2,224

Income Taxes

Income Taxes	9 Months Ended
	Oct. 01, 2017
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company recorded an income tax benefit of $0.3 million and a provision of $0.5 million for the three and nine months ended October 1, 2017 . The provision for income taxes consists primarily of alternative minimum tax and income taxes in the foreign jurisdictions in which we conduct business. We maintain a full valuation allowance for deferred tax assets, including net operating loss carry-forward and Research and Development credits. Income taxes recorded for the three and nine months ended September 25, 2016 were insignificant. As of October 1, 2017 , based on the available objective evidence, management believes it is more likely than not that the net deferred tax assets will not be realized for federal and state purposes. Accordingly, management has applied a full valuation allowance against its federal and state net deferred tax assets at October 1, 2017 . Due to improvements in the U.S. operating results (over the past three years), management believes a reasonable possibility exists that, within the next year, sufficient positive evidence may become available to reach a conclusion that the valuation allowance against its federal and state net deferred tax assets will no longer be needed. A release of such valuation allowance could cause a material increase to income in the period such determination is made. Under Internal Revenue Code (“IRC”) Section 382, our ability to utilize NOL carry-forwards or other tax attributes such as research tax credits, in any taxable year may be limited if we experience, or have experienced, an “ownership change”. A Section 382 “ownership change” generally occurs if one or more stockholders or groups of stockholders, who own at least 5% of our stock, increase their ownership by more than 50 percentage points over their lowest ownership percentage within a rolling three-year period. Similar rules may apply under state tax laws. We have completed an IRC Section 382 analysis through December 31, 2016 and determined that there was no significant limitation to the utilization of NOL or tax credit carryforwards before they expire. Since no deferred tax assets have been recognized on our balance sheet related to our NOLs and tax credits, as they are fully reserved by a valuation allowance, there was no impact to the tax provision.

Employee Benefit Plans

Employee Benefit Plans	9 Months Ended
	Oct. 01, 2017
Compensation and Retirement Disclosure [Abstract]
Employee Benefit Plans	Employee Benefit Plans Defined Contribution Plan The Company adopted a 401(k) Plan that qualifies as a deferred compensation arrangement under Section 401 of the Internal Revenue Code. Under the 401(k) Plan, participating employees may defer a portion of their pretax earnings not to exceed the maximum amount allowable. The 401(k) Plan permits the Company to make matching contributions and profit sharing contributions to eligible participants. The Company has made matching contributions of $0.4 million for the nine months ended October 1, 2017 .

Related Party transactions

Related Party transactions	9 Months Ended
	Oct. 01, 2017
Related Party Transactions [Abstract]
Related Party transactions	Related Party Transactions Purchases from Cadence Design Systems, Inc. Lip-Bu Tan, a member of the Company’s board of directors since June 2015, is the President and Chief Executive Officer of Cadence, an electronic design automation software and engineering services company. Since 2012, the Company has paid licensing fees for digital and analog layout tools and simulation tools from Cadence in the ordinary course of business. The Company incurred fees of approximately $2.0 million and $0.6 million under the terms of this arrangement during the three months ended October 1, 2017 and September 25, 2016 , respectively, and approximately $3.7 million and $1.2 million during the nine months ended October 1, 2017 and September 25, 2016 , respectively. On September 29, 2017, the Company entered into a three -year software license contract with Cadence for the use of various EDA software tools used for its research and development efforts. The license payments will be made and amortized over 12 quarterly periods amounting to approximately $3.3 million . In addition, the Company also contracted with Cadence for ongoing maintenance support which will be recognized ratably over the contractual term and amount to approximately $1.2 million . The Company has classified these licenses as definite long-lived intangible assets in its Condensed Consolidated Balance Sheets as of October 1, 2017 .

The Company and Summary of Si19

The Company and Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Oct. 01, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Reporting Calendar	Reporting Calendar The Company prepares financial statements on a 52- or 53-week fiscal year that ends on the Sunday closest to December 31. Fiscal 2017 will have 52 weeks and fiscal 2016 had 53 weeks. In a 52-week year, each fiscal quarter consists of 13 weeks.
Use of Estimates	Use of Estimates Preparation of financial statements in conformity with US GAAP requires management to make 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 reported amounts of revenue and expenses during the reporting periods covered by the financial statements and accompanying notes. Actual results could differ from those estimates.
Principles of Consolidation	Principles of Consolidation The condensed consolidated financial statements include the accounts of the Company and its wholly owned subsidiaries. All intercompany transactions and balances have been eliminated in consolidation.
New Accounting Pronouncements	Recent Accounting Pronouncements In May 2017, the FASB issued ASU No. 2017-09, Compensation-Stock Compensation (Topic 718): Scope of Modification Accounting (“ASU No 2017-09”). The amendments in ASU No. 2017-09 provide guidance about which changes to the terms or conditions of a share-based payment award require an entity to apply modification accounting in Topic 718. ASU No. 2017-09 is effective for the Company for annual and interim reporting periods beginning January 1, 2018. Early adoption of ASU No. 2017-09 is permitted, including adoption in any interim period, and the standard should be applied prospectively to an award modified on or after the adoption date. The adoption of this standard is not expected to have a material impact on the Company’s consolidated financial statements. In November 2016, the FASB issued ASU No. 2016-18, Statement of Cash Flows - Restricted Cash , which requires entities to show the changes in the total of cash, cash equivalents, restricted cash and restricted cash equivalents in the statement of cash flow. This standard is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. Early adoption is permitted, including adoption in an interim period, but any adjustments must be reflected as of the beginning of the fiscal year that includes that interim period. The new standard must be adopted retrospectively. The adoption of this standard is not expected to have a material impact on the Company’s consolidated statements of cash flows. In October 2016, the FASB issued ASU No. 2016-17, Consolidation - Interests Held through Related Parties That Are under Common Control , to amend the consolidation guidance on how a reporting entity that is the single decision maker of a variable interest entity should treat indirect interests in the entity held through related parties that are under common control within the reporting entity when determining whether it is the primary beneficiary of that variable interest entity. The standard is effective for fiscal years beginning after December 15, 2016, including interim periods within those fiscal years. Early adoption is permitted. The adoption of this standard did not have a material impact on the Company’s consolidated financial position and results of operations. In October 2016, the FASB issued ASU No. 2016-16, Income Taxes - Intra-Entity Transfers of Assets Other Than Inventory , which requires entities to recognize the income tax consequences of an intra-entity transfer of an asset other than inventory when the transfer occurs. The standard is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. Early adoption is permitted as of the beginning of a fiscal year. The new standard must be adopted using a modified retrospective transition method which is a cumulative-effective adjustment to retained earnings as of the beginning of the first effective reporting period. The Company is currently evaluating the effects, if any, that the adoption of this guidance will have on its consolidated financial statements. In August 2016, the FASB issued ASU No. 2016-15, Statement of Cash Flows - Classification of Certain Cash Receipts and Cash Payments , ASU No. 2016-15 addresses eight specific cash flow issues with the objective of reducing the existing diversity in practice in how certain cash receipts and cash payments are presented and classified in the statement of cash flows. The standard is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. Early adoption is permitted, including adoption in an interim period. The adoption of this standard is not expected to have a material impact on the Company’s consolidated statements of cash flows. In February 2016, the FASB issued ASU No. 2016-02, Leases (“ASC 842”), which sets out the principles for the recognition, measurement, presentation and disclosure of leases for both parties to a contract (i.e., lessees and lessors). The new standard requires lessees to apply a dual approach, classifying leases as either finance or operating leases based on the principle of whether or not the lease is effectively a financed purchase by the lessee. This classification will determine whether lease expense is recognized based on an effective interest method or on a straight-line basis over the term of the lease, respectively. A lessee is also required to record a right-of-use asset and a lease liability for all leases with a term of greater than twelve months regardless of their classification. Leases with a term of twelve months or less will be accounted for similar to existing guidance for operating leases today. ASC 842 supersedes the previous leases standard, ASC 840 Leases . The standard is effective on January 1, 2019, with early adoption permitted. The Company is currently evaluating the effects, if any, that the adoption of this guidance will have on its consolidated financial statements. In January 2016, the FASB issued ASU No. 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities , which addresses certain aspects of recognition, measurement, presentation and disclosure of financial instruments. ASU No. 2016-01 is effective for annual periods, and interim periods within those annual periods, beginning after December 15, 2017. The adoption of this standard is not expected to have a material impact on the Company’s consolidated financial statements. In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606) , which supersedes the revenue recognition requirements in ASC 605, Revenue Recognition . This ASU No. 2014-09 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. The ASU No. 2014-09 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, FASB issued ASU No. 2015-14, Revenue from Contracts with Customers (Topic 606): Deferral of the Effective Date , which effectively delayed the adoption date by one year, to an effective date for public entities for annual and interim periods beginning after December 15, 2017. In March, April, May and December 2016, the FASB issued additional updates to the new revenue standard relating to reporting revenue on a gross versus net basis, identifying performance obligations and licensing arrangements, and narrow-scope improvements and practical expedients, respectively. The effective date of this additional update is the same as that of ASU No. 2014-09. The guidance permits the use of either a retrospective or cumulative effect transition method. The Company has not yet selected a transition method. The Company is still finalizing the analysis to quantify the adoption impact of the provisions of the new standard, but it does not currently expect it to have a material impact on its consolidated financial position or results of operations. Based on the evaluation of its current contracts and revenue streams, revenue will be recorded consistently under both the current and new standard. The FASB has issued, and may issue in the future, interpretive guidance which may cause the Company’s evaluation to change. The Company believes it is following an appropriate timeline to allow for proper recognition, presentation and disclosure upon adoption effective the beginning of fiscal year 2018.
Fair Value Measurement	The Company determines fair value measurements used in its consolidated financial statements based upon the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. The fair value hierarchy distinguishes between (i) market participant assumptions developed based on market data obtained from independent sources (observable inputs) and (ii) an entity’s own assumptions about market participant assumptions developed based on the best information available in the circumstances (unobservable inputs). The fair value hierarchy consists of three broad levels, which gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1) and the lowest priority to unobservable inputs (Level 3). The three levels of the fair value hierarchy are described below: Level 1: Valuations based on quoted prices in active markets for identical assets or liabilities that the entity has the ability to access. Level 2: Valuations based on quoted prices for similar assets or liabilities, quoted prices in markets that are not active, or other inputs that are observable or can be corroborated by observable data for substantially the full term of the assets or liabilities. Level 3: Valuations based on inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. We obtain the fair value of our Level 1 investments in money market funds, at the expected market price. These investments are expected to maintain a net asset value of $1 per share. We determine the fair value of our Level 2 financial instruments from third-party asset managers, custodian banks, and the accounting service providers. We classify financial instruments in Level 3 of the fair value hierarchy when there is reliance on at least one significant unobservable input to the valuation model. In addition to these unobservable inputs, the valuation models for Level 3 financial instruments typically also rely on a number of inputs that are readily observable, either directly or indirectly. The Company’s assessment of the significance of a particular input to the fair value measurement in its entirety requires management to make judgments and consider factors specific to the asset or liability. There were no assets or liabilities in Level 3 of the fair value hierarchy and there were no transfers between Level 1 and Level 2 categories during any of the periods presented. We utilize the market approach to measure the fair value of our fixed income securities. The market approach is a valuation technique that uses prices and other relevant information generated by market transactions involving identical or comparable assets or liabilities. The fair value of our fixed income securities is obtained using readily-available market prices from a variety of industry standard data providers, large financial institutions and other third-party sources for the identical underlying securities
Stock-based Compensation	Stock-based compensation The Company measures and recognizes compensation expense for all stock-based awards made to employees, directors and non-employees, based on estimated fair values recognized using the straight-line method over the requisite service period. On January 1, 2017, the Company adopted the Financial Accounting Standards Board (“FASB”) Accounting Standards Update (“ASU”) 2016-09, Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting . Under this guidance, the Company elected the option to no longer apply a forfeiture rate to the stock-based compensation expense, but to record forfeitures when they occur, and, as a result, under the modified retrospective method of adoption the Company recorded an immaterial cumulative effect adjustment of $54,000 to the opening accumulated deficit on January 2, 2017.
Marketable Securities	Marketable Securities Marketable securities consist primarily of highly liquid investments with maturities of greater than 90 days when purchased. We generally classify our marketable securities at the date of acquisition as available-for-sale. These securities are reported at fair value with the related unrealized gains and losses included in " Accumulated other comprehensive loss ", a component of stockholders’ equity, net of tax. Any unrealized losses which are considered to be other-than-temporary impairments are recorded in " Other income (expense), net " in the Condensed Consolidated Statements of Operations. Realized gains (losses) on the sale of marketable securities are determined using the specific-identification method and recorded in " Other income (expense), net " in the Consolidated Statements of Operations. All of our available-for-sale investments are subject to a periodic impairment review. We record a charge to earnings when a decline in fair value is significantly below cost basis and judged to be other-than-temporary, or have other indicators of impairments. If the fair value of an available-for-sale investment is less than its amortized cost basis, an other-than-temporary impairment is triggered in circumstances where (1) we intend to sell the instrument, (2) it is more likely than not that we will be required to sell the instrument before recovery of its amortized cost basis or (3) a credit loss exists where we do not expect to recover the entire amortized cost basis of the instrument. If we intend to sell or it is more likely than not that we will be required to sell the available-for-sale investment before recovery of its amortized cost basis, we recognize an other-than temporary impairment charge equal to the entire difference between the investment's amortized cost basis and its fair value. Intangible Assets On September 29, 2017, the Company entered into a three -year software license contract with Cadence Design Systems, Inc. (“Cadence”), a related party, for the use of various Engineering Design Aid (“EDA”) software tools used for its research and development efforts. The license payments will be made and amortized over 12 quarterly periods amounting to approximately $3.3 million . In addition, the Company also contracted with Cadence for ongoing maintenance support which will be recognized ratably over the contractual term and amount to approximately $1.2 million The Company has classified these licenses as definite long-lived intangible assets in its Condensed Consolidated Balance Sheets as of October 1, 2017 . Definite long-lived intangible assets consist of software licenses which are recorded based on the total contractual price. Such assets are amortized over its contractual lives and are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. If it is determined that such assets are not recoverable, an impairment charge is recognized for the amount by which the carrying amount of such assets exceeds their fair values. There was no impairment of definite long-lived intangible assets for any periods presented.
Intangible Assets	Intangible Assets On September 29, 2017, the Company entered into a three -year software license contract with Cadence Design Systems, Inc. (“Cadence”), a related party, for the use of various Engineering Design Aid (“EDA”) software tools used for its research and development efforts. The license payments will be made and amortized over 12 quarterly periods amounting to approximately $3.3 million . In addition, the Company also contracted with Cadence for ongoing maintenance support which will be recognized ratably over the contractual term and amount to approximately $1.2 million The Company has classified these licenses as definite long-lived intangible assets in its Condensed Consolidated Balance Sheets as of October 1, 2017 . Definite long-lived intangible assets consist of software licenses which are recorded based on the total contractual price. Such assets are amortized over its contractual lives and are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. If it is determined that such assets are not recoverable, an impairment charge is recognized for the amount by which the carrying amount of such assets exceeds their fair values. There was no impairment of definite long-lived intangible assets for any periods presented.

Earnings Per Share (Tables)

Earnings Per Share (Tables)	9 Months Ended
	Oct. 01, 2017
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted	The following table summarizes the Company’s computation of basic and diluted net income (loss) per share attributable to common stockholders of the Company: Three Months Ended Nine Months Ended October 1, September 25, October 1, September 25, (in thousands, except per share data) Net income (loss) $ 2,802 $ 21 $ 2,087 $ (1,927 ) Weighted-average shares outstanding 34,780 1,227 33,960 1,175 Less: weighted average shares subject to repurchase due to early exercise (46 ) (70 ) (53 ) (127 ) Weighted average shares used to compute basic net income (loss) per share 34,734 1,157 33,907 1,048 Dilutive effect of convertible preferred stock, warrants to purchase preferred stock, stock options, common stock warrants, ESPP and RSUs 3,791 28,817 4,512 — Weighted average shares used to compute diluted net income (loss) per share 38,525 29,974 38,419 1,048 Net income (loss) per share: Basic $ 0.08 $ 0.02 $ 0.06 $ (1.84 ) Diluted $ 0.07 ​ $ 0.00 $ 0.05 $ (1.84 )
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share	The following potentially dilutive securities outstanding at the end of the periods have been excluded from the computation of diluted shares outstanding as the effect would have been anti-dilutive: Three Months Ended Nine Months Ended October 1, September 25, October 1, September 25, (in thousands) Convertible preferred stock (as-converted) — 24,790 — 24,790 Warrants to purchase convertible preferred stock — — — 39 Warrants to purchase common stock — — — 439 Restricted Stock Units (“RSUs”) 104 — 881 — Options to purchase common stock 672 1,625 672 6,640 Total 776 26,415 1,553 31,908

Balance Sheets Components (Tabl

Balance Sheets Components (Tables)	9 Months Ended
	Oct. 01, 2017
Balance Sheets Components [Abstract]
Marketable Securities	Marketable securities at October 1, 2017 consisted of the following: Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value (in thousands) Corporate debt securities $ 81,438 $ 19 $ (36 ) $ 81,421 Government debt securities 6,604 — (3 ) 6,601 $ 88,042 $ 19 $ (39 ) $ 88,022 The contractual maturities of marketable securities as of October 1, 2017 were as follows: Amortized Cost Fair Value (in thousands) Due in one year or less $ 40,663 $ 40,652 Due after one year to five years 47,379 47,370 $ 88,042 $ 88,022 Marketable securities at October 1, 2017 consisted of the following: Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value (in thousands) Corporate debt securities $ 81,438 $ 19 $ (36 ) $ 81,421 Government debt securities 6,604 — (3 ) 6,601 $ 88,042 $ 19 $ (39 ) $ 88,022
Schedule of Property and Equipment	Property and equipment, net consisted of the following: October 1, January 1, (in thousands) Computer and lab equipment $ 13,342 $ 9,748 Computer software 795 625 Furniture and fixtures 203 136 Leasehold improvements 342 218 Sub-total 14,682 10,727 Accumulated depreciation and amortization (7,550 ) (5,985 ) Net long-lived assets $ 7,132 $ 4,742 Construction-in-progress 4,083 — Total $ 11,215 $ 4,742
Schedule of Inventory	Inventory consisted of the following: October 1, January 1, (in thousands) Raw materials $ 17,478 $ 9,067 Work in progress 2,626 1,128 Finished goods 3,596 5,625 $ 23,700 $ 15,820
Other Current Liabilities	Accrued liabilities and other current liabilities consisted of the following: October 1, January 1, (in thousands) Accrued payroll and related benefits $ 3,421 $ 2,842 Accrued customer rebates 12,452 3,026 Accrual for inventory purchases 1,913 1,353 Accrued expenses 6,763 2,952 ESPP employee contributions 1,719 665 Other 1,673 963 $ 27,941 $ 11,801
Schedule of Accrued Liabilities	Accrued liabilities and other current liabilities consisted of the following: October 1, January 1, (in thousands) Accrued payroll and related benefits $ 3,421 $ 2,842 Accrued customer rebates 12,452 3,026 Accrual for inventory purchases 1,913 1,353 Accrued expenses 6,763 2,952 ESPP employee contributions 1,719 665 Other 1,673 963 $ 27,941 $ 11,801

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Oct. 01, 2017
Fair Value Disclosures [Abstract]
Fair Value, Assets Measured on Recurring Basis	We measure and report certain assets at fair value at October 1, 2017 on a recurring basis as follows: Fair Value as of October 1, 2017 Level 1 Level 2 Level 3 Total Assets: (in thousands) Cash equivalents: Money market funds $ 4,173 $ — $ — $ 4,173 Corporate debt securities — 5,989 — 5,989 Government debt securities — 2,299 — 2,299 Total cash equivalents 4,173 8,288 — 12,461 Marketable Securities: — Corporate debt securities — 81,421 — 81,421 Government debt securities — 6,601 — 6,601 Total marketable securities — 88,022 — 88,022 Total cash equivalents and marketable securities $ 4,173 $ 96,310 $ — $ 100,483
Schedule of Warrants	As of October 1, 2017 , warrants issued and outstanding were as follows: Date of Issuance Number of Warrants Exercise Price Expiration Date Common stock warrants September 2015 83,006 $ 2.50 February 2019 As of January 1, 2017 , warrants issued and outstanding were as follows: Date of Issuance Number of Warrants Exercise Price Expiration Date Common stock warrants October 2013 38,748 $ 7.74 October 2023 Common stock warrants September 2015 283,005 $ 2.50 February 2019 Common stock warrants February 2016 20,251 $ 4.00 February 2019 Common stock warrants February 2016 9,000 $ 0.05 January 2018 Common stock warrants May 2016 126,400 $ 4.00 May 2026

Commitments and Contingencies (

Commitments and Contingencies (Tables)	9 Months Ended
	Oct. 01, 2017
Commitments and Contingencies Disclosure [Abstract]
Schedule of Future Minimum Rental Payments for Operating Leases	The following is a schedule of future minimum lease payments under operating leases as of October 1, 2017 (in thousands): 2017 (remaining three months) $ 205 2018 2,028 2019 2,261 2020 2,036 2021 1,628 2022 and beyond 3,728 Total minimum lease payments $ 11,886

Long-term Debt (Tables)

Long-term Debt (Tables)	9 Months Ended
	Oct. 01, 2017
Debt Disclosure [Abstract]
Schedule of Maturities of Long-term Debt	As of October 1, 2017 , future minimum payments for the long-term debt are as follows (in thousands): Long-term debt 2017 $ 694 2018 2,383 2019 1,618 Total minimum payments 4,695 Less: Amount representing interest (185 ) Less: Amount representing closing and repayment fees (210 ) Present value of minimum payments 4,300 Less: Unamortized debt discounts (66 ) Plus: Accretion of closing and repayment fees 153 Long-term debt, net 4,387 Less: Long-term debt, current portion (2,487 ) Non-current portion of long-term debt $ 1,900

Stockholders_ Equity (Tables)

Stockholders’ Equity (Tables)	9 Months Ended
	Oct. 01, 2017
Equity [Abstract]
Schedule of Stock by Class	The Company had reserved shares of common stock for issuance, on an as-converted basis, as follows: October 1, 2017 Options issued and outstanding 5,445,007 RSUs issued and outstanding 888,359 Common stock warrants 83,006 Shares available for ESPP 1,835,341 Shares available for future stock awards 2,973,747 11,225,460

Stock-based Compensation (Table

Stock-based Compensation (Tables)	9 Months Ended
	Oct. 01, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs	Total stock-based compensation expense for employees and non-employees recognized in the condensed consolidated statements of operations was as follows: Three Months Ended Nine Months Ended October 1, September 25, October 1, September 25, (in thousands) Cost of revenue $ 38 $ 9 $ 123 $ 15 Research and development 1,367 231 3,986 454 Sales and marketing 416 60 1,179 120 General and administrative 948 734 2,159 1,635 Total stock-based compensation expense $ 2,769 $ 1,034 $ 7,447 $ 2,224 The above stock-based compensation expense related to the following equity-based awards: Three Months Ended Nine Months Ended October 1, September 25, October 1, September 25, (in thousands) Stock options $ 858 $ 1,034 $ 2,539 $ 2,224 RSU awards 1,603 — 3,553 — ESPP shares 308 — 1,355 — Total stock-based compensation expense $ 2,769 $ 1,034 $ 7,447 $ 2,224

The Company and Summary of Si27

The Company and Summary of Significant Accounting Policies (Narrative) (Details)	Sep. 29, 2017USD ($)payment	Nov. 25, 2016USD ($)shares	Jan. 01, 2017USD ($)	Oct. 27, 2016$ / shares
IPO
Subsidiary, Sale of Stock [Line Items]
Sale of stock price (USD per share) | $ / shares				$ 16
Number of shares issued (in shares) | shares		6,775,466
Consideration received		$ 97,400,000
IPO | Underwriters
Subsidiary, Sale of Stock [Line Items]
Number of shares issued (in shares) | shares		75,466
New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2016-09
Subsidiary, Sale of Stock [Line Items]
Deferred income tax liabilities, net			$ 54,000,000
New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2016-09 | Accumulated Deficit
Subsidiary, Sale of Stock [Line Items]
Cumulative effect of new accounting principle in period of adoption			$ 54,000,000
Software License Arrangement
Subsidiary, Sale of Stock [Line Items]
Term of license	3 years
License quarterly payments | payment	12
Licenses payment	$ 3,300,000
Licenses and maintenance agreements	$ 1,200,000

Earnings Per Share (Schedule of

Earnings Per Share (Schedule of Eanings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 01, 2017	Sep. 25, 2016	Oct. 01, 2017	Sep. 25, 2016
Earnings Per Share [Abstract]
Net income (loss)	$ 2,802	$ 21	$ 2,087	$ (1,927)
Weighted average shares used to compute basic and diluted net income (loss) per share:
Weighted-average shares outstanding (in shares)	34,780	1,227	33,960	1,175
Less: weighted average shares subject to repurchase due to early exercise (in shares)	(46)	(70)	(53)	(127)
Weighted average shares used to compute basic net income (loss) per share (in shares)	34,734	1,157	33,907	1,048
Dilutive effect of convertible preferred stock, warrants to purchase preferred stock, stock options, common stock warrants, ESPP and RSUs (in shares)	3,791	28,817	4,512	0
Weighted average shares used to compute basic and diluted net income (loss) per share (in shares)	38,525	29,974	38,419	1,048
Net income (loss) per share:
Basic (usd per share)	$ 0.08	$ 0.02	$ 0.06	$ (1.84)
Diluted (usd per share)	$ 0.07	$ 0	$ 0.05	$ (1.84)

Earnings Per Share (Schedule 29

Earnings Per Share (Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share) (Details) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Oct. 01, 2017	Sep. 25, 2016	Oct. 01, 2017	Sep. 25, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation (in shares)	776	26,415	1,553	31,908
Convertible preferred stock (as-converted)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation (in shares)	0	24,790	0	24,790
Warrants to purchase convertible preferred stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation (in shares)	0	0	0	39
Warrants to purchase common stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation (in shares)	0	0	0	439
Restricted Stock Units (“RSUs”)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation (in shares)	104	0	881	0
Options to purchase common stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation (in shares)	672	1,625	672	6,640

Balance Sheets Components (Mark

Balance Sheets Components (Marketable Securities) (Details) $ in Thousands	Oct. 01, 2017USD ($)
Schedule of Investments [Line Items]
Amortized Cost	$ 88,042
Gross Unrealized Gains	19
Gross Unrealized Losses	(39)
Fair Value	88,022
Corporate debt securities
Schedule of Investments [Line Items]
Amortized Cost	81,438
Gross Unrealized Gains	19
Gross Unrealized Losses	(36)
Fair Value	81,421
Government debt securities
Schedule of Investments [Line Items]
Amortized Cost	6,604
Gross Unrealized Gains	0
Gross Unrealized Losses	(3)
Fair Value	$ 6,601

Balance Sheets Components (Amor

Balance Sheets Components (Amortized Cost and Fair Value) (Details) $ in Thousands	Oct. 01, 2017USD ($)
Amortized Cost
Due in one year or less	$ 40,663
Due after one year to five years	47,379
Total, amortized cost basis	88,042
Fair Value
Due in one year or less	40,652
Due after one year to five years	47,370
Total, fair value	$ 88,022

Balance Sheets Components (Sche

Balance Sheets Components (Schedule of Property and Equipment) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 01, 2017	Sep. 25, 2016	Oct. 01, 2017	Sep. 25, 2016	Jan. 01, 2017
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 14,682		$ 14,682		$ 10,727
Accumulated depreciation and amortization	(7,550)		(7,550)		(5,985)
Net long-lived assets	7,132		7,132		4,742
Construction-in-progress	4,083		4,083		0
Total	11,215		11,215		4,742
Depreciation and amortization	500	$ 300	1,566	$ 880
Computer and lab equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	13,342		13,342		9,748
Computer software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	795		795		625
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, gross	203		203		136
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 342		$ 342		$ 218

Balance Sheets Components (Sc33

Balance Sheets Components (Schedule of Inventory) (Details) - USD ($) $ in Thousands	Oct. 01, 2017	Jan. 01, 2017
Balance Sheets Components [Abstract]
Raw materials	$ 17,478	$ 9,067
Work in progress	2,626	1,128
Finished goods	3,596	5,625
Inventory, gross	$ 23,700	$ 15,820

Balance Sheets Components (Accr

Balance Sheets Components (Accrued Liabilities and Other Current Liabilities) (Details) - USD ($) $ in Thousands	Oct. 01, 2017	Jan. 01, 2017
Balance Sheets Components [Abstract]
Accrued payroll and related benefits	$ 3,421	$ 2,842
Accrued customer rebates	12,452	3,026
Accrual for inventory purchases	1,913	1,353
Accrued expenses	6,763	2,952
ESPP employee contributions	1,719	665
Other	1,673	963
Accrued liabilities and other current liabilities	$ 27,941	$ 11,801

Fair Value Measurements (Assets

Fair Value Measurements (Assets, Recurring Basis) (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Oct. 01, 2017	Jan. 01, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	$ 12,461
Marketable securities	88,022
Total cash equivalents and marketable securities	100,483
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	4,173	$ 100,900
Marketable securities	0
Total cash equivalents and marketable securities	4,173
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	8,288
Marketable securities	88,022
Total cash equivalents and marketable securities	96,310
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0
Marketable securities	0
Total cash equivalents and marketable securities	0
Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	4,173
Money market funds | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	4,173
Money market funds | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0
Money market funds | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0
Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	5,989
Marketable securities	81,421
Corporate debt securities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0
Marketable securities	0
Corporate debt securities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	5,989
Marketable securities	81,421
Corporate debt securities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0
Marketable securities	0
Government debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	2,299
Marketable securities	6,601
Government debt securities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0
Marketable securities	0
Government debt securities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	2,299
Marketable securities	6,601
Government debt securities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0
Marketable securities	$ 0

Fair Value Measurements (Narrat

Fair Value Measurements (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	Oct. 01, 2017	Jan. 01, 2017
Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	$ 12,461
Level 1 | Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	$ 4,173	$ 100,900
Common Stock Warrants - Issued May 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Exercise price (USD per share)		$ 4
Common Stock Warrants - Issued October 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Exercise price (USD per share)	$ 7.74	$ 7.74
Warrant | Common Stock Warrants - Issued May 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Exercise price (USD per share)	$ 4

Fair Value Measurements (Schedu

Fair Value Measurements (Schedule of Warrants) (Details) - $ / shares	Oct. 01, 2017	Jan. 01, 2017
Class of Warrant or Right [Line Items]
Number of warrants outstanding (in shares)	83,006
Common Stock Warrants - Issued September 2015
Class of Warrant or Right [Line Items]
Number of warrants outstanding (in shares)	83,006
Exercise price (USD per share)	$ 2.50
Common Stock Warrants - Issued October 2013
Class of Warrant or Right [Line Items]
Number of warrants outstanding (in shares)		38,747.5
Number of warrants issued (in shares)		38,747.5
Exercise price (USD per share)	$ 7.74	$ 7.74
Common Stock Warrants - Issued September 2015
Class of Warrant or Right [Line Items]
Number of warrants outstanding (in shares)		283,004.52
Number of warrants issued (in shares)	83,006	283,004.52
Exercise price (USD per share)		$ 2.50
Common Stock Warrants - Issued February 2016
Class of Warrant or Right [Line Items]
Number of warrants outstanding (in shares)		20,251
Number of warrants issued (in shares)		20,251
Exercise price (USD per share)		$ 4
Common Stock Warrants - Issued February 2016
Class of Warrant or Right [Line Items]
Number of warrants outstanding (in shares)		9,000
Number of warrants issued (in shares)		9,000
Exercise price (USD per share)		$ 0.05
Common Stock Warrants - Issued May 2016
Class of Warrant or Right [Line Items]
Number of warrants outstanding (in shares)		126,400
Number of warrants issued (in shares)		126,400
Exercise price (USD per share)		$ 4

Commitments and Contingencies38

Commitments and Contingencies (Details) $ in Thousands	Oct. 01, 2017USD ($)
Commitments and Contingencies Disclosure [Abstract]
2017 (remaining three months)	$ 205
2,018	2,028
2,019	2,261
2,020	2,036
2,021	1,628
2022 and beyond	3,728
Total minimum lease payments	$ 11,886

Commitments and Contingencies39

Commitments and Contingencies (Narrative) (Details) ft² in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Feb. 28, 2017ft²	Oct. 01, 2017USD ($)	Sep. 25, 2016USD ($)	Oct. 01, 2017USD ($)	Sep. 25, 2016USD ($)
Other Commitments [Line Items]
Rent expense		$ 400,000	$ 300,000	$ 1,200,000	$ 900,000
Area of real estate property | ft²	84
Term of lease	76 months
Purchase obligation		30,000,000		30,000,000
Indemnification Agreement
Other Commitments [Line Items]
Guarantor obligations		$ 0		$ 0

Commitments and Contingencies40

Commitments and Contingencies (RUSNANO) (Details)	1 Months Ended
	Oct. 31, 2016patent	Oct. 01, 2017USD ($)	Jul. 31, 2014USD ($)period
Related Party Transaction [Line Items]
Number of expired patents | patent	9
Investor | Agreement with RUSNANO
Related Party Transaction [Line Items]
Contractual obligation			$ 13,000,000
Annual periods | period			6
Contractual obligation, year 1			$ 2,200,000
Contractual obligation, year 2			1,700,000
Contractual obligation, year 3			2,000,000
Contractual obligation, year 4			2,200,000
Contractual obligation, year 5			2,400,000
Contractual obligation, year 6			$ 2,500,000
Funding obligation penalty			10.00%
Difference between the funding obligation and the actual funding			80.00%
Funding obligation incurred		$ 0

Long-term Debt (Details)

Long-term Debt (Details) $ in Thousands	9 Months Ended
	Oct. 01, 2017USD ($)
Debt Instrument [Line Items]
Long-term debt, net	$ 4,387
Long-term debt, gross	$ 4,695
Loans Payable
Debt Instrument [Line Items]
Basis spread on variable rate	0.75%
Long-term debt, net	$ 4,400
Revolving Credit Facility
Debt Instrument [Line Items]
Remaining borrowing capacity	$ 20,000
Eligible accounts receivable percentage, maximum draw of credit line	80.00%
Revolving Credit Facility | Minimum
Debt Instrument [Line Items]
Line of credit interest rate during period	4.25%
Revolving Credit Facility | Maximum
Debt Instrument [Line Items]
Line of credit interest rate during period	5.00%

Long-term Debt (Schedule of Mat

Long-term Debt (Schedule of Maturities of Long-term Debt) (Details) - USD ($) $ in Thousands	Oct. 01, 2017	Jan. 01, 2017
Debt Disclosure [Abstract]
2,017	$ 694
2,018	2,383
2,019	1,618
Total minimum payments	4,695
Less: Amount representing interest	(185)
Less: Amount representing closing and repayment fees	(210)
Present value of minimum payments	4,300
Less: Unamortized debt discounts	(66)
Plus: Accretion of closing and repayment fees	153
Long-term debt, net	4,387
Less: Long-term debt, current portion	(2,487)	$ (2,257)
Long-term debt	$ 1,900	$ 3,680

Stockholders_ Equity (Details)

Stockholders’ Equity (Details)	Oct. 01, 2017vote$ / sharesshares	Jan. 01, 2017$ / sharesshares
Equity [Abstract]
Common stock, shares authorized (in shares)	1,000,000,000	1,000,000,000
Common stock, par value (usd per share) | $ / shares	$ 0.0001	$ 0.0001
Votes per share | vote	1
Options issued and outstanding (in shares)	5,445,007
RSUs issued and outstanding (in shares)	888,359
Common stock warrants (in shares)	83,006
Shares available for ESPP (in shares)	1,835,341
Shares available for future stock awards (in shares)	2,973,747
Shares reserved for future issuance (in shares)	11,225,460

Stockholders_ Equity (Narrative

Stockholders’ Equity (Narrative 1) (Details) - shares	9 Months Ended
	Oct. 01, 2017	Sep. 25, 2016
Restricted Stock Units (“RSUs”)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants in period (in shares)	1,041,629	0
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants in period (in shares)	516,750	233,775

Stockholders_ Equity (Narrati45

Stockholders’ Equity (Narrative 2) (Details)	9 Months Ended
	Oct. 01, 2017shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Repurchase rights expiration per month of shares	0.0278
Expiration period of repurchase program	36 months
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining number of shares authorized to be repurchased	44,000

Stock-based Compensation (Detai

Stock-based Compensation (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 01, 2017	Sep. 25, 2016	Oct. 01, 2017	Sep. 25, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense	$ 2,769	$ 1,034	$ 7,447	$ 2,224
Cost of revenue
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense	38	9	123	15
Research and development
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense	1,367	231	3,986	454
Sales and marketing
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense	416	60	1,179	120
General and administrative
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense	$ 948	$ 734	$ 2,159	$ 1,635

Stock-based Compensation (Equit

Stock-based Compensation (Equity Based Awards Compensation Costs) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 01, 2017	Sep. 25, 2016	Oct. 01, 2017	Sep. 25, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense	$ 2,769	$ 1,034	$ 7,447	$ 2,224
Stock options
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense	858	1,034	2,539	2,224
RSU awards
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense	1,603	0	3,553	0
ESPP shares
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense	$ 308	$ 0	$ 1,355	$ 0

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 01, 2017	Sep. 25, 2016	Oct. 01, 2017	Sep. 25, 2016
Income Tax Disclosure [Abstract]
Provision for income taxes	$ (274)	$ 14	$ 470	$ 52

Employee Benefit Plans (Details

Employee Benefit Plans (Details) $ in Millions	9 Months Ended
	Oct. 01, 2017USD ($)
Compensation and Retirement Disclosure [Abstract]
Contribution amount by Company	$ 0.4

Related Party transactions (Nar

Related Party transactions (Narrative) (Details)	Sep. 29, 2017USD ($)payment	Oct. 01, 2017USD ($)	Sep. 25, 2016USD ($)	Oct. 01, 2017USD ($)	Sep. 25, 2016USD ($)
Lip-Bu Tan
Related Party Transaction [Line Items]
Purchases from related party		$ 2,000,000	$ 600,000	$ 3,700,000	$ 1,200,000
Software License Arrangement
Related Party Transaction [Line Items]
Term of license	3 years
License quarterly payments | payment	12
Licenses payment	$ 3,300,000
Licenses and maintenance agreements	$ 1,200,000