Aquantia 10-Q 6 Dec 17 2017 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2017	Nov. 30, 2017
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q3
Trading Symbol	AQ
Entity Registrant Name	AQUANTIA CORP
Entity Central Index Key	1,316,016
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		33,488,654

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 13,529	$ 28,893
Short-term investments	1,850
Accounts receivable	12,389	11,495
Inventories	15,673	7,017
Prepaid expenses and other current assets	3,745	1,609
Total current assets	47,186	49,014
Property and equipment, net	8,521	8,122
Intangible assets, net	4,757	5,363
Other assets	4,742	3,210
Total assets	65,206	65,709
Current liabilities:
Accounts payable	5,357	4,757
Accrued liabilities	9,513	6,751
Long-term debt, current portion	10,784	11,238
Bank borrowings—line of credit	5,000
Total current liabilities	30,654	22,746
Long-term debt, net		6,991
Convertible preferred stock warrant liability	3,530	12,885
Other long-term liabilities	3,118	3,460
Total liabilities	37,302	46,082
Commitments and contingencies (Note 6)
Convertible preferred stock:
Convertible preferred stock, par value of $0.00001 per share; 213,351,797 shares authorized as of September 30, 2017 and December 31, 2016, respectively; 208,004,878 and 198,248,718 shares issued and outstanding with aggregate liquidation preference of $203,761 as of September 30, 2017 and $189,796 as of December 31, 2016 , respectively	210,269	199,434
Stockholders’ equity (deficit):
Additional paid-in capital	14,289	12,419
Accumulated deficit	(196,654)	(192,226)
Total stockholders’ equity (deficit)	(182,365)	(179,807)
Total liabilities, convertible preferred stock and stockholders’ equity (deficit)	$ 65,206	$ 65,709

CONDENSED CONSOLIDATED BALANCE3

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Common stock, par value	$ 0.00001	$ 0.00001
Common stock, shares authorized	316,000,000	307,000,000
Common stock, shares issued	4,739,936	4,443,698
Common stock, shares outstanding	4,739,936	4,443,698
Convertible Preferred Stock
Convertible preferred stock, par value	$ 0.00001	$ 0.00001
Convertible preferred stock, shares authorized	213,351,797	213,351,797
Convertible preferred stock, shares issued	208,004,878	198,248,718
Convertible preferred stock, shares outstanding	208,004,878	198,248,718
Convertible preferred stock, aggregate liquidation preference	$ 203,761	$ 189,796

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) - USD ($) shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Statement [Abstract]
Revenue	$ 26,718,000	$ 22,534,000	$ 75,525,000	$ 63,908,000
Cost of revenue	11,616,000	9,127,000	32,575,000	25,310,000
Gross profit	15,102,000	13,407,000	42,950,000	38,598,000
Operating expenses:
Research and development	11,512,000	9,321,000	32,456,000	26,622,000
Sales and marketing	1,927,000	1,344,000	5,383,000	4,217,000
General and administrative	2,572,000	1,891,000	7,047,000	5,687,000
Total operating expenses	16,011,000	12,556,000	44,886,000	36,526,000
Income (loss) from operations	(909,000)	851,000	(1,936,000)	2,072,000
Other income (expense):
Interest expense	(382,000)	(779,000)	(1,398,000)	(2,650,000)
Change in fair value of convertible preferred stock warrant liability	317,000		(1,383,000)	78,000
Other income, net	(4,000)	(6,000)	24,000	(3,000)
Total other income (expense)	(69,000)	(785,000)	(2,757,000)	(2,575,000)
Income (loss) before income tax expense	(978,000)	66,000	(4,693,000)	(503,000)
Provision for (benefit from) income taxes	27,000	(22,000)	(331,000)	84,000
Net income (loss) attributable to common stockholders	$ (1,005,000)	$ 88,000	$ (4,362,000)	$ (587,000)
Net income (loss) per share attributable to common stockholders, basic	$ (0.21)	$ 0.02	$ (0.95)	$ (0.14)
Net income (loss) per share attributable to common stockholders, diluted	$ (0.21)	$ 0	$ (0.95)	$ (0.14)
Weighted-average shares used to compute net loss per share, basic	4,710	4,405	4,603	4,173
Weighted-average shares used to compute net loss per share, diluted	4,710	28,368	4,603	4,173
Comprehensive income (loss):
Net income (loss) attributable to common stockholders	$ (1,005,000)	$ 88,000	$ (4,362,000)	$ (587,000)
Other comprehensive income (loss), net of tax:
Unrealized gains and losses - short-term investments	2,000
Comprehensive income (loss) attributable to common stockholders	$ (1,003,000)	$ 88,000	$ (4,362,000)	$ (587,000)

CONDENSED CONSOLIDATED STATEME5

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash flows from operating activities
Net income (loss) attributable to common stockholders	$ (4,362)	$ (587)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	3,422	1,892
Stock-based compensation expense	957	706
Change in fair value of convertible preferred stock warrant liability	1,383	(78)
Amortization of debt discount	286	490
Non-cash interest expense related to debt costs	139	435
Gain/loss on disposal of property and equipment		33
Changes in operating assets and liabilities:
Accounts receivable	(894)	(3,675)
Inventories	(8,656)	9,283
Prepaid expenses and other assets	(2,367)	1,810
Accounts payable	356	245
Accrued and other liabilities	2,328	706
Deferred revenue		(2,059)
Net cash provided by (used in) operating activities	(7,408)	9,201
Cash flows from investing activities
Purchases of property and equipment	(2,952)	(2,345)
Purchases of IP licenses		(2,065)
Disposal of property and equipment		6
Purchases of short-term investments	(1,850)
Net cash used in investing activities	(4,802)	(4,404)
Cash flows from financing activities
Repayments on short and long-term borrowings	(7,846)	(4,053)
Repayments on line of credit	(5,000)	(5,001)
Proceeds from line of credit	10,000
Proceeds from exercise of stock options and preferred stock warrants	944	4,763
Purchases of IP licenses	(195)
Payment of costs related to initial public offering	(1,057)	(2,174)
Net cash used in financing activities	(3,154)	(6,465)
Net decrease in cash and cash equivalents	(15,364)	(1,668)
Cash and cash equivalents at beginning of period	28,893	34,290
Cash and cash equivalents at end of period	13,529	32,622
Non-cash financing and investing transactions
Transfer of fair value of warrants to equity from liabilities upon warrant exercise	10,738
Unpaid costs related to initial public offering	608	305
Property and equipment received and accrued	$ 503	1,318
IP licenses accrued		$ 3,351

Organization, Description of Bu

Organization, Description of Business and Basis for Presentation	9 Months Ended
	Sep. 30, 2017
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Organization, Description of Business and Basis for Presentation	1. Organization, Description of Business and Basis for Presentation Organization —Aquantia Corp. (together with its subsidiaries, the “Company”) was incorporated in Delaware on January 27, 2004. The Company is a leader in the design, development and marketing of advanced high-speed communications integrated circuits, or ICs, for Ethernet connectivity in the data center, enterprise infrastructure, access and automotive markets. Initial Public Offering — On November 7, 2017, the Company completed its initial public offering (“IPO”) of 7,840,700 shares of its common stock at the offering price of $9.00 per share, including 1,022,700 shares pursuant to the underwriters’ option to purchase additional shares of the Company’s common stock, resulting in net proceeds to the Company of $65.6 million after deducting underwriters' discounts and commissions of $4.9 million, but before deducting total offering expenses of approximately $5.4 million. Certain IPO- related costs as of September 30, 2017 of $4.3 million were recorded as other assets and were subsequently reclassified to additional paid-in capital upon completion of the IPO. Immediately prior to the closing of the IPO, all outstanding shares of the Company’s convertible preferred stock automatically converted into shares of its common stock and the Company’s convertible preferred stock warrants automatically converted into warrants to purchase common stock. The Company used $9.2 million of the IPO proceeds to repay the outstanding indebtedness under the Company’s loan from Pinnacle Ventures, L.L.C. on November 8, 2017. Basis of Presentation and Principles of Consolidation - The accompanying unaudited condensed consolidated financial statements included herein have been prepared by us in accordance with U.S. generally accepted accounting principles (“GAAP”), for interim financial information and the rules and regulations of the Securities and Exchange Commission (“SEC”). In the opinion of management, normal recurring adjustments considered necessary for a fair presentation have been reflected in these condensed consolidated financial statements. Certain information and note disclosures normally included in the financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations. The consolidated balance sheet as of December 31, 2016 has been derived from the audited financial statements for the fiscal year then ended included in our final prospectus dated November 2, 2017 and filed with the SEC pursuant to Rule 424(b) under the Securities Act of 1933, as amended, on November 3, 2017 (the “Prospectus”), but does not include all of the information and notes required by GAAP for complete financial statements. The financial information included in this Quarterly Report on Form 10-Q should be read in conjunction with the audited consolidated financial statements as of and for the fiscal year ended December 31, 2016 and the related notes thereto included in the Prospectus.

Summary of Significant Accounti

Summary of Significant Accounting Policies	9 Months Ended
	Sep. 30, 2017
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	2. Summary of Significant Accounting Policies There have been no significant changes in the Company’s accounting policies from those disclosed in the Prospectus. Reverse Stock Split —In September 2017, the Company’s board of directors and stockholders approved a 1-for-10 reverse split of the Company’s common stock (the “Reverse Stock Split”), which was effected on October 5, 2017. The Company’s board of directors and stockholders also approved proportionate adjustments to the conversion prices of each series of convertible preferred stock and convertible preferred stock warrants. The number of options to purchase common stock was also proportionately adjusted to reflect the Reverse Stock Split. The par value of the common and convertible preferred stock was not adjusted as a result of the Reverse Stock Split. All share and per share information included in the accompanying condensed consolidated financial statements and notes thereto have been adjusted to reflect the Reverse Stock Split. Recent Accounting Pronouncements —In May 2017, the Financial Accounting Standards Board (“FASB”) issued ASU 2017-09, Compensation-Stock Compensation (Topic 718): Scope of Modification Accounting. It provides clarity and reduces both (i) diversity in practice and (ii) cost and complexity when applying the guidance in Topic 718, Compensation-Stock Compensation , to a change to the terms or conditions of a share-based payment award. The amendments provide guidance about which changes to the terms or conditions of a share-based payment award require an entity to apply modification accounting. The guidance is effective for fiscal years beginning after December 15, 2017, and interim periods within those years and early adoption is permitted. The Company is currently evaluating the impact of adoption of this new standard on the Company’s consolidated financial statements. In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842) In August 2015, the FASB issued ASU 2016-08, “Revenue from Contracts with Customers (Topic 606): Principal versus Agent Considerations (Reporting Revenue Gross versus Net)”

Balance Sheet Components

Balance Sheet Components	9 Months Ended
	Sep. 30, 2017
Balance Sheets Components [Abstract]
Balance Sheet Components	3. Balance Sheet Components Inventories consisted of the following (in thousands): As of September 30, As of December 31, 2017 2016 Processed wafers $ 4,321 $ 1,474 Work in process 9,298 3,310 Finished goods 2,054 2,233 Total inventories $ 15,673 $ 7,017 Prepaid expenses and other current assets consisted of the following (in thousands): As of September 30, As of December 31, 2017 2016 Processed wafer prepayments $ 1,702 $ 653 Electronic design automation tools 495 330 Other prepaid and other current assets 1,548 626 Total other prepaid and other current assets $ 3,745 $ 1,609 Property and equipment, net consisted of the following (in thousands): As of September 30, As of December 31, Estimated Useful Lives 2017 2016 Machinery and equipment 2-3 years $ 12,201 $ 10,189 Production masks 4 years 4,301 4,301 Software and computer equipment 3 years 3,470 2,724 Leasehold improvements Shorter of estimated life of asset or remaining lease term 523 271 Office furniture and fixtures 3 years 114 99 Total property and equipment 20,609 17,584 Less: accumulated depreciation and amortization (12,088 ) (9,462 ) Property and equipment, net $ 8,521 $ 8,122 Depreciation and amortization of property and equipment totaled $1.0 million and $0.6 million for the three months ended September 30, 2017 and 2016, respectively, and $2.8 million and $1.8 million for the nine months ended September 30, 2017 and 2016, respectively. Intangible assets, net were carried at cost, less accumulated amortization. Intangible assets were as follows (in thousands): As of September 30, As of December 31, Estimated Useful Lives 2017 2016 IP license 7 years $ 5,416 $ 5,416 Patents 10-12 years 348 348 Total intangible assets 5,764 5,764 Less: accumulated amortization (1,007 ) (401 ) Intangible assets, net $ 4,757 $ 5,363 Amortization of intangible assets totaled $202,000 and $72,000 for the three months ended September 30, 2017 and 2016, respectively, and $606,000 and $89,000 for the nine months ended September 30, 2017 and 2016, respectively. Amortization expense related to amortizable intangibles in future periods as of September 30, 2017 is expected to be as follows (in thousands): 2017 (remaining) $ 202 2018 808 2019 808 2020 808 2021 and thereafter 2,131 Total $ 4,757 Accrued liabilities consisted of the following (in thousands): As of September 30, As of December 31, 2017 2016 Accrued compensation and related benefits $ 4,404 $ 3,585 Accrued IP license fees 320 389 Accrued technical consulting and professional services 1,363 617 Accrued royalty, rebates, and commission 428 610 Deferred income 1,303 — Other accrued liabilities 1,695 1,550 Total accrued liabilities $ 9,513 $ 6,751

Financial Instruments

Financial Instruments	9 Months Ended
	Sep. 30, 2017
Investments All Other Investments [Abstract]
Financial Instruments	4. Financial Instruments The following is a summary of financial instruments (in thousands): As of September 30, 2017 Gross Gross Unrealized Unrealized Estimated Fair Cost Gains Losses Values Available-for sale securities Commercial Paper $ 1,699 $ — $ — $ 1,699 Money market funds 7,500 — — 7,500 Corporate bonds 2,665 — — 2,665 U.S. government securities 1,199 — — 1,199 Total available-for-sale securities $ 13,063 $ — $ — $ 13,063 Reported in: Cash and cash equivalents $ 11,213 Short-term investments 1,850 Accumulated other comprehensive loss — Total available-for-sale securities $ 13,063 Prior to June 2017, the Company’s financial instruments comprised solely of money market funds which were classified as cash equivalents. As of September 30, 2017, the Company had $13.5 million in cash, cash equivalents and $1.9 million in short-term investments. There was no sale of available-for-sale investments and therefore no significant realized gain or loss for the three and nine months ended September 30, 2017. The amounts of financial instruments in the table above will mature within the next 12 months after September 30, 2017.

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2017
Fair Value Disclosures [Abstract]
Fair Value Measurements	5. Fair Value Measurements The Company defines fair value as the price that would be received from selling an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. When determining the fair value measurements for assets and liabilities which are required to be recorded at fair value, the Company considers the principal or most advantageous market in which to transact and the market-based risk. The Company applies fair value accounting for all financial assets and liabilities that are recognized or disclosed at fair value in the financial statements on a recurring basis. Level 1 liabilities consist of accounts payable, accrued expense and long-term debt. The carrying amounts of accounts receivable, prepaid expenses, accounts payable and accrued liabilities approximate fair value due to the short-term nature of these items. Based on the borrowing rates currently available to the Company for debt with similar terms, the carrying value of the term debt approximates fair value as well. The Company categorizes assets and liabilities recorded at fair value based upon the level of judgment associated with inputs used to measure their fair value. The categories are as follows: Level 1 —Observable inputs, such as quoted prices in active markets for identical, unrestricted assets, or liabilities. Level 2 —Quoted prices for similar assets or liabilities, or inputs other than quoted prices in active markets that are observable either directly or indirectly. Level 3 —Unobservable inputs in which there is little or no market data, which require the Company to develop its own assumptions about the assumptions market participants would use in pricing the asset or liability. Valuation techniques include use of option-pricing models, discounted cash flows models, and similar techniques. The hierarchy requires the Company to use observable market data, when available, and to minimize the use of unobservable inputs when determining fair value. The following tables represent the Company’s financial assets and financial liabilities measured at fair value on a recurring basis categorized by the fair value hierarchy as of September 30, 2017 and December 31, 2016 (in thousands): As of September 30, 2017 Level 1 Level 2 Level 3 Total Financial asset— available-for-sales securities Money market funds $ 7,500 $ — $ — $ 7,500 Commercial Paper — 1,699 — 1,699 Corporate bonds — 2,665 — 2,665 U.S. government securities — 1,199 — 1,199 Total financial asset—available-for-sales securities $ 7,500 $ 5,563 $ — $ 13,063 Financial liability—convertible preferred stock warrant liability $ — $ — $ 3,530 $ 3,530 As of December 31, 2016 Level 1 Level 2 Level 3 Total Financial asset—money market funds $ 15,316 $ — $ — $ 15,316 Financial liability—convertible preferred stock warrant liability $ — $ — $ 12,885 $ 12,885 The summary of changes in the fair value of the Company’s Level 3 financial liabilities was as follows (in thousands): Balance as of January 1, 2017 $ 12,885 Change in fair value of convertible preferred stock warrant liability 1,383 Exercise of Series H convertible preferred stock warrants (10,738 ) Balance as of September 30, 2017 $ 3,530 See Note 8 for discussion of valuation methods and inputs for such financial liabilities. The Company has not changed the manner in which it values liabilities that are measured at estimated fair value using Level 3 inputs. There were no transfers within the hierarchy during the nine months ended September 30, 2017 or the year ended December 31, 2016.

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2017
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	6. Commitments and Contingencies Lease and purchase obligations— The Company leases office and research facilities under operating leases for its U.S. headquarters and international locations that expire at various dates through March 2020. Under any lease agreement that contains escalating rent provisions, lease expense is recorded on a straight-line basis over the lease term. Rent expense for the three months ended September 30, 2017 and 2016 was $0.3 million and $0.2 million, respectively. Rent expense for the nine months ended September 30, 2017 and 2016 was $0.8 million and $0.7 million, respectively. In addition, the Company has purchase obligations which included agreements and issued purchase orders containing non-cancelable payment terms to purchase goods and services. As of September 30, 2017, future minimum operating lease payments and purchase obligations are as follows (in thousands): Total Operating Purchase Lease and Purchase Leases Obligations Obligations 2017 (remaining) $ 290 $ 13,850 $ 14,140 2018 662 4,943 5,605 2019 234 1,974 2,208 2020 128 198 326 2021 and thereafter 169 — 169 Total $ 1,483 $ 20,965 $ 22,448 Litigation— The Company accrues for contingencies when it believes that a loss is probable and that it can reasonably estimate the amount of any such loss and the Company has made an assessment of the probability of incurring any such losses and whether or not those losses are estimable. Although the Company is not currently subject to any litigation, and the Company is not aware of any litigation currently threatened against it, the Company may be subject to legal proceedings, claims and litigation, including intellectual property litigation, arising in the ordinary course of business. Such matters are subject to many uncertainties and outcomes and are not predictable with assurance. The Company accrues amounts that it believes are adequate to address any liabilities related to legal proceedings and other loss contingencies that it believes will result in a probable loss that is reasonably estimable. To the extent there is a reasonable possibility that a loss exceeding amounts already recognized may be incurred and the amount of such additional loss would be material, the Company will either disclose the estimated additional loss or state that such an estimate cannot be made. The Company does not currently believe that it is reasonably possible that losses in connection with litigation arising in the ordinary course of business would be material. Indemnification— Under the indemnification provisions of the Company’s standard sales-related contracts, the Company agrees to defend its customers against third-party claims asserting infringement of certain intellectual property rights, which may include patents, copyrights, trademarks, or trade secrets, and to pay judgments entered on such claims. Certain agreements include indemnification provisions that could potentially expose the Company to losses in excess of the amount received under the agreement. In addition, the Company indemnifies its directors and certain of its officers while they are serving in good faith in such capacities. To date, the Company has not incurred costs to defend lawsuits or settle claims related to these indemnification agreements. As of September 30, 2017 and December 31, 2016, no liability associated with such indemnifications had been recorded.

Debt

Debt	9 Months Ended
	Sep. 30, 2017
Debt Disclosure [Abstract]
Debt	7. Debt In connection with each of the Loan and Security Agreements with Pinnacle Ventures L.L.C. (“Pinnacle Ventures”) and the Loan and Security Agreement with Hercules Technology Growth Capital, each as described below, the Company has granted in favor of the lenders thereunder a security interest in substantially all of the Company’s assets other than the Company’s intellectual property. The loan with Pinnacle Ventures is subordinated to the loan with Hercules Technology Growth Capital pursuant to a subordination agreement. Loan and Security Agreement with Pinnacle Ventures— On April 5, 2013, the Company entered into a Loan and Security Agreement with Pinnacle Ventures (the “2013 Agreement”) to borrow an aggregate principal amount of $15 million. The interest rate on this loan was the greater of the prime rate plus 925 basis points or 12.5% per annum. As of December 31, 2014, immediately prior to the effective date of the 2013 Amended Agreement (as defined below), the interest rate was 12.5%. The Company was required to make interest-only payments for the first 24 months starting in April 2013 and thereafter make 18 equal installment payments of principal and interest through October 5, 2016, the original maturity date of the loan. In connection with the 2013 Agreement, the Company issued 646,551 fully vested Series F convertible preferred stock warrants at an exercise price of $0.9280000 before the Reverse Stock Split. See Notes 1, 2 and 8 for additional information. The agreement also provided a conversion right (the “Conversion Right”), which expired unexercised on September 30, 2014 and was reclassified to convertible preferred stock. The Conversion Right was accounted for as a financial derivative and the estimated fair value was determined using the Monte Carlo Simulation with an initial aggregate fair value of $180,843. The estimated fair value was determined using the following assumptions: risk-free interest rate of 0.21%, contractual term of 0.46 years to 0.96 years, and volatility of 45%. On December 16, 2014, the Company amended the 2013 Agreement with Pinnacle Ventures (the “2013 Amended Agreement”) to borrow an additional $8.8 million and modify the terms of the existing loan of $15 million, including extending the maturity date to July 1, 2018. The interest rate on this loan, effective January 1, 2015, was the greater of the prime rate plus 550 basis points or 8.75% per annum. As of September 30, 2017 and December 31, 2016, the interest rate on this loan was 9.75% and 9.25%, respectively. Under the terms of the 2013 Amended Agreement, principal payments for the combined loan started in May 2016. An additional payment of $1.5 million was due upon the earliest to occur of the maturity date of July 1, 2018 or the prepayment of all outstanding principal and accrued and unpaid interest. The final payment is being amortized to interest expense over the original term of the loan. In connection with this 2013 Amended Agreement, the Company also issued 640,129 fully vested Series G convertible preferred stock warrants with an exercise price of $1.4314298 per share before the Reverse Stock Split. See Notes 1, 2 and 8 for additional information. The 2013 Amended Agreement contained customary financial reporting and insurance requirements, and negative covenants that limit the Company’s ability to, among other things, prepay or incur additional indebtedness, grant liens, make investments, repurchase stock, pay dividends, transfer assets, and merge or consolidate. As of September 30, 2017, the Company was in compliance with all covenants. This loan was repaid in full subsequent to the IPO in November 2017. See Note 1 for additional information. Loan and Security Agreement with Hercules Technology Growth Capital— On January 30, 2015, the Company entered into a Loan and Security Agreement with Hercules Technology Growth Capital for an $11.5 million revolving line of credit. In connection with this agreement, the Company issued fully vested warrants to purchase 196,831 shares of convertible preferred stock at an exercise price of $1.4314298 per share before the Reverse Stock Split. See Notes 1, 2 and 8 for additional information. At the election of the holder, these warrants may be exercised for Series G or Series H convertible preferred stock. The line of credit is based upon a percentage of eligible receivables and eligible customer purchase orders. The line of credit bears a variable rate of interest and is based upon the Federal Reserve’s prime rate and changes in the Company’s borrowing base eligibility and whether the borrowing base is based on eligible accounts receivables or eligible purchase orders or both. The line of credit matures on February 1, 2018. An additional final payment of $0.3 million is due upon the earliest to occur of the maturity date, the date of prepayment of the outstanding secured obligations, or the date that the secured obligations become due and payable. The final payment was recorded as a long-term liability and other asset on the Company’s consolidated balance sheet and the asset is amortized to interest expense over 24 months, the initial term of the agreement. As of September 30, 2017, the amount outstanding under the line of credit was $5.0 million with an average interest rate of 7.20% and the amount available for borrowing was $6.5 million. The agreement contains customary financial reporting requirements and negative covenants that limit the Company’s ability to, among other things, incur additional indebtedness, grant liens, make investments, repurchase stock, pay dividends, lend money or forgive indebtedness to employees, officers or directors, transfer assets, and merge or consolidate. As of September 30, 2017, the Company was in compliance with all covenants. Debt obligations consisted of the following (in thousands): As of September 30, As of December 31, 2017 2016 Term loans $ 9,396 $ 17,241 Final payment liability 1,443 1,192 Total term loans 10,839 18,433 Unamortized debt discount (55 ) (204 ) Balance term loans 10,784 18,229 Bank borrowings—line of credit 5,000 — Total debt 15,784 18,229 Less: long-term debt, current portion and bank borrowings—line of credit (15,784 ) (11,238 ) Long-term debt $ — $ 6,991

Convertible Preferred Stock War

Convertible Preferred Stock Warrants	9 Months Ended
	Sep. 30, 2017
Equity [Abstract]
Convertible Preferred Stock Warrants	8 . Convertible Preferred Stock Warrants The following convertible preferred stock warrants, which will be subject to the Reverse Stock Split and converted into warrants to purchase the Company’s common stock immediately prior to the closing of the IPO, were outstanding (in thousands except share and per share amounts; see Notes 1 and 2 for additional information): As of September 30, 2017 As of December 31, 2016 Exercise Price Preferred Shares Fair Preferred Shares Fair Series Per Share Expiration Date Underlying Warrants Value Underlying Warrants Value B $ 2.150275 3/9/2018 31,973 — 31,973 — C-1 (1) $ 0.010000 1/16/2019 2,472,088 2,793 2,472,088 1,760 D $ 0.666397 3/9/2018, 11/16/2019 825,332 262 825,332 272 F $ 0.928000 4/5/2023 646,551 237 646,551 154 G $ 1.431430 12/16/2024 640,129 182 640,129 93 G/H $ 1.431430 1/3/2025 196,831 56 196,831 29 H $ 0.010000 3/25/2025 — — 9,756,160 10,577 Total Warrants 4,812,904 $ 3,530 14,569,064 $ 12,885 (1) 3,006,008 shares of Series C-1 preferred stock underlie the Series C-1 warrant, of which 2,472,088 shares have vested. Series B Convertible Preferred Stock Warrants Issued to Pinnacle Ventures —As consideration for a 2008 Amended and Restated Loan and Security Agreement with Pinnacle Ventures, the Company issued fully vested warrants to purchase 157,538 shares of Series B convertible preferred stock at an exercise price of $2.1502753 per share. These Series B warrants have a term of 10 years. In connection with the issuance of the Series D convertible preferred stock in November 2009, warrants to purchase 125,565 shares of Series B convertible preferred stock automatically converted into warrants to purchase 405,164 shares of Series D convertible preferred stock at $0.6663973 per share. The remaining warrants will expire in March 2018. See “—Series D Convertible Preferred Stock Warrants Issued to Pinnacle Ventures” below. Series C-1 Convertible Preferred Stock Warrants Issued to Intel Corporation —In connection with entering into the Intel Agreement, the Company issued warrants to purchase up to 4,006,088 shares of Series C-1 convertible preferred stock at an exercise price of $0.01 per share. The warrants are valued as they vest and become exercisable upon the achievement of certain milestones, primarily related to product development. As of September 30, 2017, warrants to purchase 534,000 shares of Series C-1 convertible preferred stock are subject to potential vesting under the Intel Agreement. The fair value at vesting will be allocated to the Intel Agreement. During the year ended December 31, 2009, warrants to purchase 3,472,088 shares vested with an initial value of $1,927,505. Prior to 2014, 1,000,000 of the shares underlying the vested warrants were issued upon exercise of such warrants. The remaining warrants will expire in January 2019. Series D Convertible Preferred Stock Warrants Issued to Pinnacle Ventures —As consideration for a 2009 Amendment to the 2008 Amended and Restated Loan and Security Agreement with Pinnacle Ventures, the Company issued to Pinnacle Ventures fully vested warrants to purchase 210,084 shares of Series D convertible preferred stock. The Company also issued fully vested warrants to purchase an additional 210,084 shares of Series D convertible preferred stock when the Company borrowed an additional $3.5 million in December 2010. In addition, in connection with the issuance of the Series D convertible preferred stock in November 2009, warrants to purchase 125,565 shares of Series B convertible preferred stock automatically converted into fully vested warrants to purchase 405,164 shares of Series D convertible preferred stock. The Series D warrants have an exercise price of $0.6663973 per share and a term of ten years. These warrants will expire in March 2018 and November 2019. Series F Convertible Preferred Stock Warrants Issued to Pinnacle Ventures —On April 5, 2013, in connection with the 2013 Agreement, the Company issued to Pinnacle Ventures fully vested warrants to purchase 646,551 Series F convertible preferred stock at an exercise price of $0.928 price per share. These warrants will expire in April 2023. Series G Convertible Preferred Stock Warrants Issued to Pinnacle Ventures —On December 16, 2014, in connection with the 2013 Amended Agreement, the Company issued to Pinnacle Ventures fully vested warrants to purchase 640,129 shares of Series G convertible preferred stock at an exercise price of $1.4314298 per share. At issuance, the estimated fair value was determined using the Monte Carlo Simulation with an aggregate fair value of $173,091 that was determined using the following assumptions: risk-free rate of 2.13%, contractual term of 9.71 years, and volatility of 50%. The warrants will expire in December 2024. Series G or Series H Convertible Preferred Stock Warrants Issued to Hercules Technology Growth Capital —On January 30, 2015, the Company entered into a Loan and Security Agreement with Hercules Technology Growth Capital for an $11.5 million, revolving line of credit. In connection with this agreement, the Company issued fully vested warrants to purchase 196,831 shares at an exercise price of $1.4314298 per share. At the election of the holder, these warrants may be exercised for Series G or Series H convertible preferred stock. At issuance, the estimated fair value was determined using the Monte Carlo Simulation with an aggregate fair value of $50,000 that was determined using the following assumptions: risk-free rate of 2.06%, contractual term of 9.83 years, and volatility of 50%. The warrants will expire in January 2025. Series H Convertible Preferred Stock Warrants Issued to GLOBALFOUNDRIES U.S. Inc. —In connection with the collaboration and development agreement with GLOBALFOUNDRIES U.S. Inc. on March 25, 2015, the Company issued to GLOBALFOUNDRIES U.S. Inc. fully vested warrants to purchase 9,756,160 shares of Series H convertible preferred stock at an exercise price of $0.01 per share. At issuance, the estimated fair value was determined using the Monte Carlo Simulation with an aggregate estimated fair value of $12.0 million that was determined using the following assumptions: risk-free interest rate of 1.03%, expected term of one year, no expected dividends, and volatility of 35%. The fair value of these warrants was recorded as an operating expense in the consolidated statement of operations at the date of issuance. These warrants would have expired at the earlier of March 2025, the Company’s IPO, or a deemed liquidation event. These warrants were exercised in May 2017. Determining Fair Value of Convertible Preferred Stock Warrants The assumptions used to determine the fair value of convertible preferred stock warrants were as follows: Nine Months Ended Year Ended September 30, December 31, 2017 2016 Valuation method Black-Scholes Pricing Model Black-Scholes Pricing Model Risk-free interest rate 0.89%-2.24% 0.39%-2.25% Expected term 0.4 - 7.9 yrs 0.3 - 9.0 yrs Expected dividends 0% 0% Volatility 25% - 35% 25% - 50% Fair value of preferred stock: Convertible preferred Series B $ 0.98 $ 0.73 Convertible preferred Series C-1 0.98 0.73 Convertible preferred Series D 0.98 0.78 Convertible preferred Series F 0.98 0.91 Convertible preferred Series G 0.98 1.40 Convertible preferred Series H — 1.43

Common Stock

Common Stock	9 Months Ended
	Sep. 30, 2017
Equity [Abstract]
Common Stock	9. Common Stock The Company’s certificate of incorporation, as of September 30, 2017 and December 31, 2016, authorized the Company to issue up to 316,000,000 and 307,000,000 shares of common stock at $0.00001 par value per share, respectively. Each share of common stock is entitled to one vote. The holders of common stock are also entitled to receive dividends out of funds legally available therefore, when and if declared by the board of directors, subject to the approval and priority rights of holders of all classes of convertible preferred stock outstanding. No dividends have been declared to date. The Company had shares of common stock reserved for issuance as follows: As of September 30, As of December 31, 2017 2016 Conversion of convertible preferred stock 20,816,754 19,841,138 Conversion of convertible preferred stock warrants 584,148 1,559,764 Outstanding options to purchase common stock 3,813,197 2,906,596 Future grants under stock option plans 234,352 537,191 Total shares reserved for issuance 25,448,451 24,844,689 The Company’s convertible preferred stock issued and outstanding was as follows (dollars in thousands): As of September 30, 2017 As of December 31, 2016 Issued and Carrying Issued and Carrying Outstanding Value Outstanding Value Convertible preferred Series A 18,664,514 $ 15,216 18,664,514 $ 15,216 Convertible preferred Series B 12,049,428 25,834 12,049,428 25,834 Convertible preferred Series C-1 1,000,000 922 1,000,000 922 Convertible preferred Series D 57,172,304 37,950 57,172,304 37,950 Convertible preferred Series E 26,438,711 22,608 26,438,711 22,608 Convertible preferred Series F 43,103,440 40,017 43,103,440 40,017 Convertible preferred Series G 13,972,043 19,917 13,972,043 19,917 Convertible preferred Series H 35,604,438 47,805 25,848,278 36,970 Total 208,004,878 $ 210,269 198,248,718 $ 199,434 Immediately prior to the closing of the Company’s IPO, all outstanding shares of its convertible preferred stock automatically converted into 20,816,754 shares of common stock. Stock Option Plan —Under the Company’s equity incentive plans (the “Plan”), 537,191 shares of common stock have been reserved as of December 31, 2016 and 234,352 shares of common stock have been reserved as of September 30, 2017 for the issuance of incentive stock options (“ISO”); nonstatutory stock options (“NSO”); or the sales of restricted common stock to employees, officers, directors, and consultants of the Company. The exercise price of an option is determined by the board of directors when the option is granted and may not be less than 85% of the fair market value of the shares on the date of grant, provided that the exercise price of an ISO is not less than 100% of the fair market value of the shares on the date of grant and the exercise price of any option granted to a 10% stockholder is not less than 110% of the fair market value of the shares on the date of grant. ISOs granted under the Plan generally vest 25% after the completion of 12 months of service and the balance in equal monthly installments over the next 36 months of service and expire 10 years from the grant date. NSOs vest as per the specific agreement and expire 10 years from the date of grant. The Plan allows for early exercise of options prior to full vesting as determined by the board of directors and set forth in the stock option agreements governing such options. Exercises of unvested options are subject to repurchase by the Company at not less than the original exercise price upon termination of employment. For the year ended December 31, 2016 and the nine months ended September 30, 2017, there was a de minimis amount of shares subject to repurchase. Activity under the Company’s stock option plan is set forth below: Weighted- Number of Weighted Average Shares Average Remaining Aggregate Available for Exercise Contractual Intrinsic Value Issuanc e Number of Share s Pric e Term (Years ) (in thousands ) Balance—December 31, 2016 537,191 2,906,596 $ 3.20 8.1 $ 4,941 Shares authorized for grant 900,000 — Granted (1,289,482 ) 1,289,482 $ 7.04 Exercised — (296,238 ) $ 2.86 Canceled 86,643 (86,643 ) $ 4.27 Balance—September 30, 2017 234,352 3,813,197 $ 4.50 8.1 $ 15,699 Vested and exercisable—September 30, 2017 1,548,378 $ 2.83 6.8 $ 13,283 Vested and exercisable—December 31, 2016 1,208,989 $ 2.40 6.9 $ 2,994 As of September 30, 2017, approximately $5.1 million of unrecognized stock compensation costs related to awards were expected to be recognized over a weighted-average period of 3.3 years. As of December 31, 2016, approximately $2.4 million of unrecognized stock compensation costs related to awards were expected to be recognized over a weighted-average period of 2.8 years. The aggregate intrinsic value of options exercised during the nine months ended September 30, 2017 was $1.2 million. The aggregate intrinsic value of options exercised during the year ended December 31, 2016 was $6.3 million. The weighted-average grant-date fair value of options granted during the nine months ended September 30, 2017, was $2.94 per share. The weighted-average grant-date fair value of options granted during the year ended December 31, 2016 was $1.52 per share.

Stock-Based Compensation Expens

Stock-Based Compensation Expense	9 Months Ended
	Sep. 30, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock-Based Compensation Expense	10. Stock-Based Compensation Expense The Company uses the straight-line vesting attribution method to record stock-based compensation expense. Stock-based compensation expense recognized in the consolidated statements of operations and comprehensive income (loss) was as follows (in thousands): Three Months Ended Nine Months Ended September 30, September 30, 2017 2016 2017 2016 Cost of revenue $ 12 $ 8 $ 26 $ 23 Research and development 251 153 544 359 Sales and marketing 46 24 110 70 General and administrative 99 72 277 254 Total $ 408 $ 257 $ 957 $ 706 No income tax benefit associated with stock-based compensation expense was recognized in the condensed consolidated statements of operations and comprehensive income (loss) for the three and nine months ended September 30, 2017 and 2016. The calculated fair value of option grants was estimated using the Black-Scholes model with the following assumptions for which options were granted: Three Months Ended Nine Months Ended September 30, September 30, 2017 2016 2017 2016 Risk-free interest rate 1.94%-2.40% 1.24% - 1.58% 1.89%-2.40% 1.46% - 1.88% Expected term 6.1 - 10 yrs 6.1 - 9.8 yrs 6.1 - 10 yrs 6.1 - 10 yrs Expected dividends 0% 0 % 0% 0 % Volatility 27% - 30% 34 % 27% - 30% 34 %

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2017
Income Tax Disclosure [Abstract]
Income Taxes	11. Income Taxes The Company recorded an income tax benefit of $27,000 and provision of $22,000 for the three months ended September 30, 2017 and 2016, respectively. The Company recorded an income tax benefit of $0.3 million and provision of $84,000 for the nine months ended September 30, 2017 and 2016, respectively. The income tax benefit for the nine months ended September 30, 2017 consisted primarily of research credit from a foreign jurisdiction. As of September 30, 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 as of September 30, 2017. A release of such valuation allowance could cause a material increase to income in the period such determination is made. Internal Revenue Code Section 382 and similar California rules place a limitation on the amount of taxable income that can be offset by NOL carryforwards after a change in control (generally greater than 50% change in ownership). Generally, after a control change, a corporation cannot deduct NOL carryforwards in excess of the Section 382 limitations. Due to these provisions, utilization of NOL and tax credit carryforwards may be subject to annual limitations regarding their utilization against taxable income in future periods. The Company completed a Section 382 analysis in 2016 and determined an ownership change occurred in July 2005 and November 2009, which resulted in reductions to the U.S. federal and California net operating losses of $35.5 million and $34.3 million, respectively, and U.S. federal research and development credits by $1.8 million. 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.

Net Income (Loss) Per Share

Net Income (Loss) Per Share	9 Months Ended
	Sep. 30, 2017
Earnings Per Share [Abstract]
Net Income (Loss) Per Share	12. Net Income (Loss) Per Share The following table summarizes the computation of basic and diluted net income (loss) per share attributable to common stockholders (in thousands, except per share data): Three Months Ended Nine Months Ended September 30, September 30, 2017 2016 2017 2016 Net income (loss) $ (1,005 ) $ 88 $ (4,362 ) $ (587 ) Weighted-average shares outstanding - basic 4,710 4,405 $ 4,603 $ 4,173 Basic net income (loss) per share attributable to common stockholders $ (0.21 ) $ 0.02 $ (0.95 ) $ (0.14 ) Effect of potential dilutive shares: Add stock options to purchase common stock — 2,809 — — Add convertible preferred stock and warrant — 21,154 — — Weighted-average number of shares outstanding—diluted 4,710 28,368 4,603 4,173 Diluted net income (loss) per share attributable to common stockholders $ (0.21 ) $ 0.00 $ (0.95 ) $ (0.14 ) Basic net income (loss) per share attributable to common stockholders is computed by dividing the net income (loss) by the weighted-average number of common shares outstanding for the period. Basic and diluted net income (loss) per share attributable to common stockholders is presented in conformity with the two-class method required for participating securities as the holders of the Company’s convertible preferred stock are entitled to receive non-cumulative dividends, payable prior and in preference to any dividends on shares of the common stock. Any additional dividends will be distributed among the holders of convertible preferred stock and common stock pro rata, assuming the conversion of all convertible preferred stock into common stock. Under the two-class method, net income attributable to common stockholders is determined by allocating undistributed earnings, calculated as net income less current period earnings allocated to preferred stockholders based on their respective rights to receive dividends. In computing diluted net income attributed to common stockholders, undistributed earnings are re-allocated to reflect the potential impact of dilutive securities. Basic net income per common share is computed by dividing the net income attributable to common stockholders by the weighted-average number of common shares outstanding during the period. The Company’s convertible preferred stockholders do not have a contractual obligation to share in the Company’s losses. As such, the net income (loss) is attributed entirely to the common stockholders. The following potentially dilutive securities outstanding have been excluded from the computation of diluted weighted-average shares outstanding because such securities have an antidilutive impact due to losses reported (in common stock equivalent shares): Three Months Ended Nine Months Ended September 30, September 30, 2017 2017 2016 Stock options to purchase common stock 3,846,714 3,407,444 2,808,653 Convertible preferred stock 20,816,754 20,373,618 19,831,374 Convertible preferred stock warrants 584,148 584,148 1,736,912 Total 25,247,616 24,365,210 24,376,939

Segment and Geographic Informat

Segment and Geographic Information	9 Months Ended
	Sep. 30, 2017
Segment Reporting [Abstract]
Segment and Geographic Information	13. Segment and Geographic Information The Company operates in one reportable segment related to the design, development and sale of network communication integrated circuits. The Company’s chief operating decision-maker (“CODM”) is its Chief Executive Officer, who reviews operating results on an aggregate basis and manages the Company’s operations as a whole for the purpose of evaluating financial performance and allocating resources. Substantially all of the Company’s long-lived assets were attributable to operations in the United States as of September 30, 2017 and December 31, 2016. The following table summarizes revenue by market (in thousands): Three Months Ended Nine Months Ended September 30, September 30, 2017 2016 2017 2016 Revenue by market: Data Center $ 14,912 $ 16,500 $ 47,672 $ 45,759 Enterprise Infrastructure 10,815 6,034 26,190 18,149 Access 888 — 1,468 — Automotive 103 — 195 — Total revenue $ 26,718 $ 22,534 $ 75,525 $ 63,908 The Company sells its products worldwide and attributes revenue to the geography where the product is shipped. The geographical distribution of revenue as a percentage of total revenue for the periods indicated was as follows: Three Months Ended Nine Months Ended September 30, September 30, 2017 2016 2017 2016 Malaysia 55 % 52 % 62 % 60 % China 38 34 31 28 United States — 11 1 6 Other 7 3 6 6 Total 100 % 100 % 100 % 100 %

Concentrations

Concentrations	9 Months Ended
	Sep. 30, 2017
Risks And Uncertainties [Abstract]
Concentrations	14. Concentrations Significant Customers —Credit risk with respect to accounts receivable is concentrated with two large customers that contribute a majority of the Company’s business and is mitigated by a relatively short collection period. Collateral is not required for accounts receivable. The fair value of accounts receivable approximates their carrying value. Revenue and accounts receivable concentrated with significant customers and their manufacturing subcontractors as a percentage of accounts receivable and total revenue were as follows: As of As of September 30, December 31, 2017 2016 Accounts Receivable: Customer A 41 % 62 % Customer B 41 23 Three Months Ended Nine Months Ended September 30, September 30, 2017 2016 2017 2016 Revenue: Customer A 54 % 64 % 61 % 65 % Customer B 34 25 29 24

Related Party Transaction

Related Party Transaction	9 Months Ended
	Sep. 30, 2017
Related Party Transactions [Abstract]
Related Party Transaction	15. Related Party Transaction In 2016, the Company entered into an agreement with a significant stockholder to license certain technology intended to be incorporated into the Company’s products under development. Under this agreement, the Company agreed to pay an initial $2.0 million licensing fee and additional licensing fees at a later point of the development program upon the achievement of certain development milestones. In addition, royalties may be due on products sold utilizing the licensed technology. From time to time, the Company also purchases tooling, mask sets, wafers and services from this stockholder in its ordinary course of business. For the year ended December 31, 2016, the Company recorded the license amount of $5.4 million to intangible assets, net representing $2.1 million fees paid and $3.3 million for the portion due upon milestones completion which was included in accrued and other long-term liabilities in relation to the IP license. Starting in 2016, the Company recorded $4.2 million and $3.6 million to research and development expenses, inventory and cost of revenue for the year ended December 31, 2016 and nine months ended September 30, 2017, respectively, in relation to toolings, mask sets, wafers and services. As of September 30, 2017, the total balance due this stockholder was $3.7 million, which was included in accrued, accounts payable and other long-term liabilities.

Subsequent Event

Subsequent Event	9 Months Ended
	Sep. 30, 2017
Subsequent Events [Abstract]
Subsequent Event	16. Subsequent Event On October 5, 2017, the Company effected a 1-for-10 reverse split of the Company’s common stock. The board of directors and stockholders also approved proportionate adjustments to the conversion prices of each series of convertible preferred stock and convertible preferred stock warrants. See Note 2 for additional information. On November 7, 2017, the Company completed its IPO of 7,840,700 shares of its common stock at the offering price of $9.00 per share, including 1,022,700 shares pursuant to the underwriters’ option to purchase additional shares of the Company’s common stock, resulting in net proceeds to the Company of $65.6 million after deducting underwriters' discounts and commissions of $4.9 million, but before deducting total offering expenses of approximately $5.4 million. Immediately prior to the closing of the IPO, all outstanding shares of the Company’s convertible preferred stock automatically converted into shares of its common stock and the Company’s convertible preferred stock warrants automatically converted into warrants to purchase common stock. On November 8, 2017, the Company used $9.2 million of the proceeds from the IPO to repay the outstanding indebtedness under the loan with Pinnacle Ventures.

Summary of Significant Accoun22

Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2017
Accounting Policies [Abstract]
Reverse Stock Split	Reverse Stock Split —In September 2017, the Company’s board of directors and stockholders approved a 1-for-10 reverse split of the Company’s common stock (the “Reverse Stock Split”), which was effected on October 5, 2017. The Company’s board of directors and stockholders also approved proportionate adjustments to the conversion prices of each series of convertible preferred stock and convertible preferred stock warrants. The number of options to purchase common stock was also proportionately adjusted to reflect the Reverse Stock Split. The par value of the common and convertible preferred stock was not adjusted as a result of the Reverse Stock Split. All share and per share information included in the accompanying condensed consolidated financial statements and notes thereto have been adjusted to reflect the Reverse Stock Split.
Recent Accounting Pronouncements	Recent Accounting Pronouncements —In May 2017, the Financial Accounting Standards Board (“FASB”) issued ASU 2017-09, Compensation-Stock Compensation (Topic 718): Scope of Modification Accounting. It provides clarity and reduces both (i) diversity in practice and (ii) cost and complexity when applying the guidance in Topic 718, Compensation-Stock Compensation , to a change to the terms or conditions of a share-based payment award. The amendments provide guidance about which changes to the terms or conditions of a share-based payment award require an entity to apply modification accounting. The guidance is effective for fiscal years beginning after December 15, 2017, and interim periods within those years and early adoption is permitted. The Company is currently evaluating the impact of adoption of this new standard on the Company’s consolidated financial statements. In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842) In August 2015, the FASB issued ASU 2016-08, “Revenue from Contracts with Customers (Topic 606): Principal versus Agent Considerations (Reporting Revenue Gross versus Net)”

Balance Sheet Components (Table

Balance Sheet Components (Tables)	9 Months Ended
	Sep. 30, 2017
Balance Sheets Components [Abstract]
Schedule of Inventories	Inventories consisted of the following (in thousands): As of September 30, As of December 31, 2017 2016 Processed wafers $ 4,321 $ 1,474 Work in process 9,298 3,310 Finished goods 2,054 2,233 Total inventories $ 15,673 $ 7,017
Schedule of Prepaid Expenses and Other Current Assets	Prepaid expenses and other current assets consisted of the following (in thousands): As of September 30, As of December 31, 2017 2016 Processed wafer prepayments $ 1,702 $ 653 Electronic design automation tools 495 330 Other prepaid and other current assets 1,548 626 Total other prepaid and other current assets $ 3,745 $ 1,609
Schedule of Property and Equipment, Net	Property and equipment, net consisted of the following (in thousands): As of September 30, As of December 31, Estimated Useful Lives 2017 2016 Machinery and equipment 2-3 years $ 12,201 $ 10,189 Production masks 4 years 4,301 4,301 Software and computer equipment 3 years 3,470 2,724 Leasehold improvements Shorter of estimated life of asset or remaining lease term 523 271 Office furniture and fixtures 3 years 114 99 Total property and equipment 20,609 17,584 Less: accumulated depreciation and amortization (12,088 ) (9,462 ) Property and equipment, net $ 8,521 $ 8,122
Schedule of Intangible Assets	Intangible assets, net were carried at cost, less accumulated amortization. Intangible assets were as follows (in thousands): As of September 30, As of December 31, Estimated Useful Lives 2017 2016 IP license 7 years $ 5,416 $ 5,416 Patents 10-12 years 348 348 Total intangible assets 5,764 5,764 Less: accumulated amortization (1,007 ) (401 ) Intangible assets, net $ 4,757 $ 5,363
Schedule of Amortization Expense Related to Amortizable Intangibles In Future Periods	Amortization expense related to amortizable intangibles in future periods as of September 30, 2017 is expected to be as follows (in thousands): 2017 (remaining) $ 202 2018 808 2019 808 2020 808 2021 and thereafter 2,131 Total $ 4,757
Schedule of Accrued Liabilities	Accrued liabilities consisted of the following (in thousands): As of September 30, As of December 31, 2017 2016 Accrued compensation and related benefits $ 4,404 $ 3,585 Accrued IP license fees 320 389 Accrued technical consulting and professional services 1,363 617 Accrued royalty, rebates, and commission 428 610 Deferred income 1,303 — Other accrued liabilities 1,695 1,550 Total accrued liabilities $ 9,513 $ 6,751

Financial Instruments (Tables)

Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2017
Investments All Other Investments [Abstract]
Summary of Financial Instruments	The following is a summary of financial instruments (in thousands): As of September 30, 2017 Gross Gross Unrealized Unrealized Estimated Fair Cost Gains Losses Values Available-for sale securities Commercial Paper $ 1,699 $ — $ — $ 1,699 Money market funds 7,500 — — 7,500 Corporate bonds 2,665 — — 2,665 U.S. government securities 1,199 — — 1,199 Total available-for-sale securities $ 13,063 $ — $ — $ 13,063 Reported in: Cash and cash equivalents $ 11,213 Short-term investments 1,850 Accumulated other comprehensive loss — Total available-for-sale securities $ 13,063

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2017
Fair Value Disclosures [Abstract]
Schedule of Financial Assets and Financial Liabilities Measured at Fair Value on a Recurring Basis	The following tables represent the Company’s financial assets and financial liabilities measured at fair value on a recurring basis categorized by the fair value hierarchy as of September 30, 2017 and December 31, 2016 (in thousands): As of September 30, 2017 Level 1 Level 2 Level 3 Total Financial asset— available-for-sales securities Money market funds $ 7,500 $ — $ — $ 7,500 Commercial Paper — 1,699 — 1,699 Corporate bonds — 2,665 — 2,665 U.S. government securities — 1,199 — 1,199 Total financial asset—available-for-sales securities $ 7,500 $ 5,563 $ — $ 13,063 Financial liability—convertible preferred stock warrant liability $ — $ — $ 3,530 $ 3,530 As of December 31, 2016 Level 1 Level 2 Level 3 Total Financial asset—money market funds $ 15,316 $ — $ — $ 15,316 Financial liability—convertible preferred stock warrant liability $ — $ — $ 12,885 $ 12,885
Summary of Changes in the Fair Value of the Company's Level 3 Financial Liabilities	The summary of changes in the fair value of the Company’s Level 3 financial liabilities was as follows (in thousands): Balance as of January 1, 2017 $ 12,885 Change in fair value of convertible preferred stock warrant liability 1,383 Exercise of Series H convertible preferred stock warrants (10,738 ) Balance as of September 30, 2017 $ 3,530

Commitments and Contingencies (

Commitments and Contingencies (Tables)	9 Months Ended
	Sep. 30, 2017
Commitments And Contingencies Disclosure [Abstract]
Schedule of Future Minimum Operating Lease Payments and Purchase Obligations	As of September 30, 2017, future minimum operating lease payments and purchase obligations are as follows (in thousands): Total Operating Purchase Lease and Purchase Leases Obligations Obligations 2017 (remaining) $ 290 $ 13,850 $ 14,140 2018 662 4,943 5,605 2019 234 1,974 2,208 2020 128 198 326 2021 and thereafter 169 — 169 Total $ 1,483 $ 20,965 $ 22,448

Debt (Tables)

Debt (Tables)	9 Months Ended
	Sep. 30, 2017
Debt Disclosure [Abstract]
Schedule of Debt Obligations	Debt obligations consisted of the following (in thousands): As of September 30, As of December 31, 2017 2016 Term loans $ 9,396 $ 17,241 Final payment liability 1,443 1,192 Total term loans 10,839 18,433 Unamortized debt discount (55 ) (204 ) Balance term loans 10,784 18,229 Bank borrowings—line of credit 5,000 — Total debt 15,784 18,229 Less: long-term debt, current portion and bank borrowings—line of credit (15,784 ) (11,238 ) Long-term debt $ — $ 6,991

Convertible Preferred Stock W28

Convertible Preferred Stock Warrants (Tables)	9 Months Ended
	Sep. 30, 2017
Class Of Warrant Or Right [Line Items]
Summary of Convertible Preferred Stock Warrants Subject to Reverse Stock Split and Converted Into Warrants Prior to IPO	The following convertible preferred stock warrants, which will be subject to the Reverse Stock Split and converted into warrants to purchase the Company’s common stock immediately prior to the closing of the IPO, were outstanding (in thousands except share and per share amounts; see Notes 1 and 2 for additional information): As of September 30, 2017 As of December 31, 2016 Exercise Price Preferred Shares Fair Preferred Shares Fair Series Per Share Expiration Date Underlying Warrants Value Underlying Warrants Value B $ 2.150275 3/9/2018 31,973 — 31,973 — C-1 (1) $ 0.010000 1/16/2019 2,472,088 2,793 2,472,088 1,760 D $ 0.666397 3/9/2018, 11/16/2019 825,332 262 825,332 272 F $ 0.928000 4/5/2023 646,551 237 646,551 154 G $ 1.431430 12/16/2024 640,129 182 640,129 93 G/H $ 1.431430 1/3/2025 196,831 56 196,831 29 H $ 0.010000 3/25/2025 — — 9,756,160 10,577 Total Warrants 4,812,904 $ 3,530 14,569,064 $ 12,885 (1) 3,006,008 shares of Series C-1 preferred stock underlie the Series C-1 warrant, of which 2,472,088 shares have vested.
Convertible Preferred Stock Warrants
Class Of Warrant Or Right [Line Items]
Schedule of Assumptions Used to Determine Fair Value of Convertible Preferred Stock	The assumptions used to determine the fair value of convertible preferred stock warrants were as follows: Nine Months Ended Year Ended September 30, December 31, 2017 2016 Valuation method Black-Scholes Pricing Model Black-Scholes Pricing Model Risk-free interest rate 0.89%-2.24% 0.39%-2.25% Expected term 0.4 - 7.9 yrs 0.3 - 9.0 yrs Expected dividends 0% 0% Volatility 25% - 35% 25% - 50% Fair value of preferred stock: Convertible preferred Series B $ 0.98 $ 0.73 Convertible preferred Series C-1 0.98 0.73 Convertible preferred Series D 0.98 0.78 Convertible preferred Series F 0.98 0.91 Convertible preferred Series G 0.98 1.40 Convertible preferred Series H — 1.43

Common Stock (Tables)

Common Stock (Tables)	9 Months Ended
	Sep. 30, 2017
Equity [Abstract]
Schedule of Common Stock Reserved for Issuance	The Company had shares of common stock reserved for issuance as follows: As of September 30, As of December 31, 2017 2016 Conversion of convertible preferred stock 20,816,754 19,841,138 Conversion of convertible preferred stock warrants 584,148 1,559,764 Outstanding options to purchase common stock 3,813,197 2,906,596 Future grants under stock option plans 234,352 537,191 Total shares reserved for issuance 25,448,451 24,844,689
Summary of Convertible Preferred Stock Issued and Outstanding	The Company’s convertible preferred stock issued and outstanding was as follows (dollars in thousands): As of September 30, 2017 As of December 31, 2016 Issued and Carrying Issued and Carrying Outstanding Value Outstanding Value Convertible preferred Series A 18,664,514 $ 15,216 18,664,514 $ 15,216 Convertible preferred Series B 12,049,428 25,834 12,049,428 25,834 Convertible preferred Series C-1 1,000,000 922 1,000,000 922 Convertible preferred Series D 57,172,304 37,950 57,172,304 37,950 Convertible preferred Series E 26,438,711 22,608 26,438,711 22,608 Convertible preferred Series F 43,103,440 40,017 43,103,440 40,017 Convertible preferred Series G 13,972,043 19,917 13,972,043 19,917 Convertible preferred Series H 35,604,438 47,805 25,848,278 36,970 Total 208,004,878 $ 210,269 198,248,718 $ 199,434
Summary of Stock Option Plan	Activity under the Company’s stock option plan is set forth below: Weighted- Number of Weighted Average Shares Average Remaining Aggregate Available for Exercise Contractual Intrinsic Value Issuanc e Number of Share s Pric e Term (Years ) (in thousands ) Balance—December 31, 2016 537,191 2,906,596 $ 3.20 8.1 $ 4,941 Shares authorized for grant 900,000 — Granted (1,289,482 ) 1,289,482 $ 7.04 Exercised — (296,238 ) $ 2.86 Canceled 86,643 (86,643 ) $ 4.27 Balance—September 30, 2017 234,352 3,813,197 $ 4.50 8.1 $ 15,699 Vested and exercisable—September 30, 2017 1,548,378 $ 2.83 6.8 $ 13,283 Vested and exercisable—December 31, 2016 1,208,989 $ 2.40 6.9 $ 2,994

Stock-Based Compensation Expe30

Stock-Based Compensation Expense (Tables)	9 Months Ended
	Sep. 30, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Schedule of Stock-Based Compensation Expense	Stock-based compensation expense recognized in the consolidated statements of operations and comprehensive income (loss) was as follows (in thousands): Three Months Ended Nine Months Ended September 30, September 30, 2017 2016 2017 2016 Cost of revenue $ 12 $ 8 $ 26 $ 23 Research and development 251 153 544 359 Sales and marketing 46 24 110 70 General and administrative 99 72 277 254 Total $ 408 $ 257 $ 957 $ 706
Schedule of Fair Value Assumptions for Option Grants	The calculated fair value of option grants was estimated using the Black-Scholes model with the following assumptions for which options were granted: Three Months Ended Nine Months Ended September 30, September 30, 2017 2016 2017 2016 Risk-free interest rate 1.94%-2.40% 1.24% - 1.58% 1.89%-2.40% 1.46% - 1.88% Expected term 6.1 - 10 yrs 6.1 - 9.8 yrs 6.1 - 10 yrs 6.1 - 10 yrs Expected dividends 0% 0 % 0% 0 % Volatility 27% - 30% 34 % 27% - 30% 34 %

Net Income (Loss) Per Share (Ta

Net Income (Loss) Per Share (Tables)	9 Months Ended
	Sep. 30, 2017
Earnings Per Share [Abstract]
Summary of Computation of Basic and Diluted Net Income (Loss) Per Share Attributable to Common Shareholders	The following table summarizes the computation of basic and diluted net income (loss) per share attributable to common stockholders (in thousands, except per share data): Three Months Ended Nine Months Ended September 30, September 30, 2017 2016 2017 2016 Net income (loss) $ (1,005 ) $ 88 $ (4,362 ) $ (587 ) Weighted-average shares outstanding - basic 4,710 4,405 $ 4,603 $ 4,173 Basic net income (loss) per share attributable to common stockholders $ (0.21 ) $ 0.02 $ (0.95 ) $ (0.14 ) Effect of potential dilutive shares: Add stock options to purchase common stock — 2,809 — — Add convertible preferred stock and warrant — 21,154 — — Weighted-average number of shares outstanding—diluted 4,710 28,368 4,603 4,173 Diluted net income (loss) per share attributable to common stockholders $ (0.21 ) $ 0.00 $ (0.95 ) $ (0.14 )
Summary of Potentially Dilutive Securities Outstanding Excluded from Computation of Diluted Weighted-average Shares Outstanding	The following potentially dilutive securities outstanding have been excluded from the computation of diluted weighted-average shares outstanding because such securities have an antidilutive impact due to losses reported (in common stock equivalent shares): Three Months Ended Nine Months Ended September 30, September 30, 2017 2017 2016 Stock options to purchase common stock 3,846,714 3,407,444 2,808,653 Convertible preferred stock 20,816,754 20,373,618 19,831,374 Convertible preferred stock warrants 584,148 584,148 1,736,912 Total 25,247,616 24,365,210 24,376,939

Segment and Geographic Inform32

Segment and Geographic Information (Tables)	9 Months Ended
	Sep. 30, 2017
Segment Reporting [Abstract]
Schedule of Revenue from Segments	The following table summarizes revenue by market (in thousands): Three Months Ended Nine Months Ended September 30, September 30, 2017 2016 2017 2016 Revenue by market: Data Center $ 14,912 $ 16,500 $ 47,672 $ 45,759 Enterprise Infrastructure 10,815 6,034 26,190 18,149 Access 888 — 1,468 — Automotive 103 — 195 — Total revenue $ 26,718 $ 22,534 $ 75,525 $ 63,908
Schedule of Geographical Distribution of Revenue	The geographical distribution of revenue as a percentage of total revenue for the periods indicated was as follows: Three Months Ended Nine Months Ended September 30, September 30, 2017 2016 2017 2016 Malaysia 55 % 52 % 62 % 60 % China 38 34 31 28 United States — 11 1 6 Other 7 3 6 6 Total 100 % 100 % 100 % 100 %

Concentrations (Tables)

Concentrations (Tables)	9 Months Ended
	Sep. 30, 2017
Risks And Uncertainties [Abstract]
Schedule of Customer Concentration as Percentage of Accounts Receivable and Total Revenue	Revenue and accounts receivable concentrated with significant customers and their manufacturing subcontractors as a percentage of accounts receivable and total revenue were as follows: As of As of September 30, December 31, 2017 2016 Accounts Receivable: Customer A 41 % 62 % Customer B 41 23 Three Months Ended Nine Months Ended September 30, September 30, 2017 2016 2017 2016 Revenue: Customer A 54 % 64 % 61 % 65 % Customer B 34 25 29 24

Organization, Description of 34

Organization, Description of Business and Basis for Presentation - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	Nov. 08, 2017	Nov. 07, 2017	Sep. 30, 2017	Sep. 30, 2016
Subsidiary Sale of Stock [Line Items]
Offering expense			$ 1,057	$ 2,174
Proceeds used to repay outstanding indebtedness			7,846	$ 4,053
IPO
Subsidiary Sale of Stock [Line Items]
IPO related costs recorded as other assets			$ 4,300
IPO | Subsequent Event
Subsidiary Sale of Stock [Line Items]
Net proceeds from IPO		$ 65,600
Underwriting discounts and commissions		4,900
Offering expense		$ 5,400
Proceeds used to repay outstanding indebtedness	$ 9,200
IPO | Common Stock | Subsequent Event
Subsidiary Sale of Stock [Line Items]
Number of shares issued		7,840,700
Offering price per share		$ 9
IPO | Common Stock | Underwriters | Subsequent Event
Subsidiary Sale of Stock [Line Items]
Number of shares issued		1,022,700

Summary of Significant Accoun35

Summary of Significant Accounting Policies - Additional Information (Details)	9 Months Ended
	Sep. 30, 2017
Accounting Policies [Abstract]
Description of the reverse stock split arrangement	1-for-10 reverse split
Ratio applied to the conversion of stock split	0.10

Balance Sheet Components - Sche

Balance Sheet Components - Schedule of Inventories (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Inventory Disclosure [Abstract]
Processed wafers	$ 4,321	$ 1,474
Work in process	9,298	3,310
Finished goods	2,054	2,233
Total inventories	$ 15,673	$ 7,017

Balance Sheet Components - Sc37

Balance Sheet Components - Schedule of Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Prepaid Expense And Other Assets Current [Abstract]
Processed wafer prepayments	$ 1,702	$ 653
Electronic design automation tools	495	330
Other prepaid and other current assets	1,548	626
Total other prepaid and other current assets	$ 3,745	$ 1,609

Balance Sheet Components - Sc38

Balance Sheet Components - Schedule of Property and Equipment, Net (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 20,609	$ 17,584
Less: accumulated depreciation and amortization	(12,088)	(9,462)
Property and equipment, net	8,521	8,122
Machinery and Equipment
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 12,201	10,189
Machinery and Equipment | Minimum
Property Plant And Equipment [Line Items]
Property and equipment, estimated useful lives	2 years
Machinery and Equipment | Maximum
Property Plant And Equipment [Line Items]
Property and equipment, estimated useful lives	3 years
Production Masks
Property Plant And Equipment [Line Items]
Property and equipment, estimated useful lives	4 years
Property and equipment, gross	$ 4,301	4,301
Software and Computer Equipment
Property Plant And Equipment [Line Items]
Property and equipment, estimated useful lives	3 years
Property and equipment, gross	$ 3,470	2,724
Leasehold Improvements
Property Plant And Equipment [Line Items]
Property and equipment, estimated useful lives	Shorter of estimated life of asset or remaining lease term
Property and equipment, gross	$ 523	271
Furniture and Fixtures
Property Plant And Equipment [Line Items]
Property and equipment, estimated useful lives	3 years
Property and equipment, gross	$ 114	$ 99

Balance Sheet Components - Addi

Balance Sheet Components - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Balance Sheets Components [Abstract]
Depreciation and amortization of property and equipment	$ 1,000,000	$ 600,000	$ 2,800,000	$ 1,800,000
Amortization of intangible assets	$ 202,000	$ 72,000	$ 606,000	$ 89,000

Balance Sheet Components - Sc40

Balance Sheet Components - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Finite Lived Intangible Assets [Line Items]
Intangible assets, gross	$ 5,764	$ 5,764
Less: accumulated amortization	(1,007)	(401)
Intangible assets, net	$ 4,757	5,363
IP license
Finite Lived Intangible Assets [Line Items]
Intangible assets, estimated useful lives	7 years
Intangible assets, gross	$ 5,416	5,416
Patents
Finite Lived Intangible Assets [Line Items]
Intangible assets, gross	$ 348	$ 348
Patents | Minimum
Finite Lived Intangible Assets [Line Items]
Intangible assets, estimated useful lives	10 years
Patents | Maximum
Finite Lived Intangible Assets [Line Items]
Intangible assets, estimated useful lives	12 years

Balance Sheet Components - Sc41

Balance Sheet Components - Schedule of Amortization Expense Related to Amortizable Intangibles In Future Periods (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Finite Lived Intangible Assets Future Amortization Expense [Abstract]
2017 (remaining)	$ 202
2,018	808
2,019	808
2,020	808
2021 and thereafter	2,131
Intangible assets, net	$ 4,757	$ 5,363

Balance Sheet Components - Sc42

Balance Sheet Components - Schedule of Accrued Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Accrued Liabilities Current [Abstract]
Accrued compensation and related benefits	$ 4,404	$ 3,585
Accrued IP license fees	320	389
Accrued technical consulting and professional services	1,363	617
Accrued royalty, rebates, and commission	428	610
Deferred income	1,303
Other accrued liabilities	1,695	1,550
Total accrued liabilities	$ 9,513	$ 6,751

Financial Instruments - Summary

Financial Instruments - Summary of Financial Instruments (Details) $ in Thousands	Sep. 30, 2017USD ($)
Schedule Of Available For Sale Securities [Line Items]
Cost	$ 13,063
Estimated Fair Values	13,063
Commercial Paper
Schedule Of Available For Sale Securities [Line Items]
Cost	1,699
Estimated Fair Values	1,699
Money Market Fund
Schedule Of Available For Sale Securities [Line Items]
Cost	7,500
Estimated Fair Values	7,500
Corporate Bonds
Schedule Of Available For Sale Securities [Line Items]
Cost	2,665
Estimated Fair Values	2,665
U.S. Government Securities
Schedule Of Available For Sale Securities [Line Items]
Cost	1,199
Estimated Fair Values	1,199
Cash and Cash Equivalents
Schedule Of Available For Sale Securities [Line Items]
Estimated Fair Values	11,213
Short-term Investments
Schedule Of Available For Sale Securities [Line Items]
Estimated Fair Values	$ 1,850

Financial Instruments - Additio

Financial Instruments - Additional Information (Details) - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Dec. 31, 2015
Investments Debt And Equity Securities [Abstract]
Cash and cash equivalents	$ 13,529,000	$ 13,529,000	$ 28,893,000	$ 32,622,000	$ 34,290,000
Short-term investments	1,850,000	1,850,000
Sale of available-for-sale investments	0	0
Available for sale, realized gain	0	0
Available for sale, realized loss	$ 0	$ 0

Fair Value Measurements - Sched

Fair Value Measurements - Schedule of Financial Assets and Financial Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Estimated Fair Values	$ 13,063
Convertible preferred stock warrant liability	3,530	$ 12,885
Corporate Bonds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Estimated Fair Values	2,665
Recurring Basis
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Estimated Fair Values	13,063
Convertible preferred stock warrant liability	3,530	12,885
Recurring Basis | Money Market Fund
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Estimated Fair Values	7,500	15,316
Recurring Basis | Commercial Paper
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Estimated Fair Values	1,699
Recurring Basis | U.S. Government Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Estimated Fair Values	1,199
Recurring Basis | Corporate Bonds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Estimated Fair Values	2,665
Recurring Basis | Level 1
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Estimated Fair Values	7,500
Recurring Basis | Level 1 | Money Market Fund
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Estimated Fair Values	7,500	15,316
Recurring Basis | Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Estimated Fair Values	5,563
Recurring Basis | Level 2 | Commercial Paper
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Estimated Fair Values	1,699
Recurring Basis | Level 2 | U.S. Government Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Estimated Fair Values	1,199
Recurring Basis | Level 2 | Corporate Bonds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Estimated Fair Values	2,665
Recurring Basis | Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Convertible preferred stock warrant liability	$ 3,530	$ 12,885

Fair Value Measurements - Summa

Fair Value Measurements - Summary of Changes in the Fair Value of the Company's Level 3 Financial Liabilities (Details) - Level 3 $ in Thousands	9 Months Ended
	Sep. 30, 2017USD ($)
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning balance	$ 12,885
Change in fair value of convertible preferred stock warrant liability	1,383
Exercise of Series H convertible preferred stock warrants	(10,738)
Ending balance	$ 3,530

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Details) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Transfers within hierarchy	$ 0	$ 0

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Commitments And Contingencies Disclosure [Abstract]
Rent expense	$ 0.3	$ 0.2	$ 0.8	$ 0.7

Commitments and Contingencies49

Commitments and Contingencies - Schedule of Future Minimum Operating Lease Payments and Purchase Obligations (Details) $ in Thousands	Sep. 30, 2017USD ($)
Operating Leases
2017 (remaining)	$ 290
2,018	662
2,019	234
2,020	128
2021 and thereafter	169
Total	1,483
Purchase Obligations
2017 (remaining)	13,850
2,018	4,943
2,019	1,974
2,020	198
Total	20,965
Total Lease and Purchase Obligations
2017 (remaining)	14,140
2,018	5,605
2,019	2,208
2,020	326
2021 and thereafter	169
Total	$ 22,448

Debt - Additional Information (

Debt - Additional Information (Details) - USD ($)	Jan. 30, 2015	Dec. 16, 2014	Apr. 05, 2013	Sep. 30, 2017	Dec. 31, 2016	Dec. 31, 2014
Debt Instrument [Line Items]
Term Loan			$ 15,000,000	$ 10,784,000	$ 18,229,000
Debt instrument basis point			9.25%
Interest on borrowings			12.50%			12.50%
Debt Instrument, payment terms				The Company was required to make interest-only payments for the first 24 months starting in April 2013 and thereafter make 18 equal installment payments of principal and interest through October 5, 2016, the original maturity date of the loan.
Debt instrument, maturity date				Oct. 5, 2016
Additional payment due at maturity date				$ 1,443,000	$ 1,192,000
Revolving Credit Facility
Debt Instrument [Line Items]
Debt instrument, maturity date	Feb. 1, 2018
Convertible preferred stock issued upon conversion	196,831
Warrants to purchase common stock, exercise price	$ 1.4314298
Line of credit facility	$ 11,500,000
Additional payment due at maturity date	$ 300,000
Initial term of agreement	24 months
Amount outstanding under line of credit				$ 5,000,000
Average interest rate				7.20%
Amount available for borrowing				$ 6,500,000
Two Thousand And Thirteen Amended Agreement | Pinnacle Ventures
Debt Instrument [Line Items]
Interest on borrowings		8.75%		9.75%	9.25%
Debt instrument, maturity date		Jul. 1, 2018
Additional borrowings		$ 8,800,000
Additional payment due at maturity date		$ 1,500,000
Two Thousand And Thirteen Amended Agreement | Series G Convertible Preferred Stock Warrants | Pinnacle Ventures
Debt Instrument [Line Items]
Convertible preferred stock issued upon conversion		640,129
Warrants to purchase common stock, exercise price		$ 1.4314298
Series F Convertible Preferred Stock
Debt Instrument [Line Items]
Convertible preferred stock issued upon conversion			646,551
Warrants to purchase common stock, exercise price			$ 0.9280000
Warrant expiration date			Sep. 30, 2014
Fair value of derivative			$ 180,843
Risk-free interest rate			0.21%
Expected volatility			45.00%
Series F Convertible Preferred Stock | Minimum
Debt Instrument [Line Items]
Expected term			5 months 16 days
Series F Convertible Preferred Stock | Maximum
Debt Instrument [Line Items]
Expected term			11 months 16 days

Debt - Schedule of Debt Obligat

Debt - Schedule of Debt Obligations (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016	Apr. 05, 2013
Debt Disclosure [Abstract]
Term loans	$ 9,396	$ 17,241
Final payment liability	1,443	1,192
Total term loans	10,839	18,433
Unamortized debt discount	(55)	(204)
Balance term loans	10,784	18,229	$ 15,000
Bank borrowings—line of credit	5,000
Total debt	15,784	18,229
Less: long-term debt, current portion and bank borrowings—line of credit	$ (15,784)	(11,238)
Long-term debt, net		$ 6,991

Convertible Preferred Stock W52

Convertible Preferred Stock Warrants - Summary of Convertible Preferred Stock Warrants Subject to Reverse Stock Split and Converted Into Warrants Prior to IPO (Details) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Class Of Warrant Or Right [Line Items]
Preferred Shares underlying Warrants	4,812,904	14,569,064
Fair Value	$ 3,530	$ 12,885
Series B Convertible Preferred Stock Warrants
Class Of Warrant Or Right [Line Items]
Warrants to purchase common stock, exercise price	$ 2.150275
Expiration Date	Mar. 9, 2018
Preferred Shares underlying Warrants	31,973	31,973
Series C-1 Convertible Preferred Stock Warrants
Class Of Warrant Or Right [Line Items]
Warrants to purchase common stock, exercise price	$ 0.010000
Expiration Date	Jan. 16, 2019
Preferred Shares underlying Warrants	2,472,088	2,472,088
Fair Value	$ 2,793	$ 1,760
Series D Convertible Preferred Stock Warrants
Class Of Warrant Or Right [Line Items]
Warrants to purchase common stock, exercise price	$ 0.666397
Preferred Shares underlying Warrants	825,332	825,332
Fair Value	$ 262	$ 272
Series D Convertible Preferred Stock Warrants | Expiration Date One
Class Of Warrant Or Right [Line Items]
Expiration Date	Mar. 9, 2018
Series D Convertible Preferred Stock Warrants | Expiration Date Two
Class Of Warrant Or Right [Line Items]
Expiration Date	Nov. 16, 2019
Series F Convertible Preferred Stock Warrants
Class Of Warrant Or Right [Line Items]
Warrants to purchase common stock, exercise price	$ 0.928000
Expiration Date	Apr. 5, 2023
Preferred Shares underlying Warrants	646,551	646,551
Fair Value	$ 237	$ 154
Series G Convertible Preferred Stock Warrants
Class Of Warrant Or Right [Line Items]
Warrants to purchase common stock, exercise price	$ 1.431430
Expiration Date	Dec. 16, 2024
Preferred Shares underlying Warrants	640,129	640,129
Fair Value	$ 182	$ 93
Series G or Series H Convertible Preferred Stock Warrants
Class Of Warrant Or Right [Line Items]
Warrants to purchase common stock, exercise price	$ 1.431430
Expiration Date	Jan. 3, 2025
Preferred Shares underlying Warrants	196,831	196,831
Fair Value	$ 56	$ 29
Series H Convertible Preferred Stock Warrants
Class Of Warrant Or Right [Line Items]
Warrants to purchase common stock, exercise price	$ 0.010000
Expiration Date	Mar. 25, 2025
Preferred Shares underlying Warrants		9,756,160
Fair Value		$ 10,577

Convertible Preferred Stock W53

Convertible Preferred Stock Warrants - Summary of Convertible Preferred Stock Warrants Subject to Reverse Stock Split and Converted Into Warrants Prior to IPO (Parenthetical) (Details) - shares	Sep. 30, 2017	Dec. 31, 2016
Class Of Warrant Or Right [Line Items]
Preferred shares underlying warrants	4,812,904	14,569,064
Series C-1 Convertible Preferred Stock Warrants
Class Of Warrant Or Right [Line Items]
Convertible preferred shares having underlying warrants	3,006,008	3,006,008
Preferred shares underlying warrants	2,472,088	2,472,088

Convertible Preferred Stock W54

Convertible Preferred Stock Warrants - Additional Information (Details) - USD ($)	Mar. 25, 2015	Jan. 30, 2015	Dec. 16, 2014	Apr. 05, 2013	Nov. 30, 2009	Sep. 30, 2017	Dec. 31, 2013	Dec. 31, 2010	Dec. 31, 2009
Revolving Credit Facility
Class Of Warrant Or Right [Line Items]
Warrants issued		196,831
Warrant exercise price		$ 1.4314298
Line of credit facility		$ 11,500,000
Series B Convertible Preferred Stock Warrants
Class Of Warrant Or Right [Line Items]
Warrant exercise price						$ 2.150275
Warrant expiration date						Mar. 9, 2018
Series C-1 Convertible Preferred Stock Warrants
Class Of Warrant Or Right [Line Items]
Warrant exercise price						$ 0.010000
Warrant expiration date						Jan. 16, 2019
Series D Convertible Preferred Stock Warrants
Class Of Warrant Or Right [Line Items]
Warrant exercise price						$ 0.666397
Series D Convertible Preferred Stock Warrants | Expiration Date One
Class Of Warrant Or Right [Line Items]
Warrant expiration date						Mar. 9, 2018
Series D Convertible Preferred Stock Warrants | Expiration Date Two
Class Of Warrant Or Right [Line Items]
Warrant expiration date						Nov. 16, 2019
Series F Convertible Preferred Stock Warrants
Class Of Warrant Or Right [Line Items]
Warrant exercise price						$ 0.928000
Warrant expiration date						Apr. 5, 2023
Series G Convertible Preferred Stock Warrants
Class Of Warrant Or Right [Line Items]
Warrant exercise price						$ 1.431430
Warrant expiration date						Dec. 16, 2024
Series G or Series H Convertible Preferred Stock Warrants
Class Of Warrant Or Right [Line Items]
Warrant exercise price						$ 1.431430
Warrant expiration date						Jan. 3, 2025
Series F Convertible Preferred Stock
Class Of Warrant Or Right [Line Items]
Warrants issued				646,551
Warrant exercise price				$ 0.9280000
Risk-free interest rate				0.21%
Expected volatility				45.00%
Series F Convertible Preferred Stock | Maximum
Class Of Warrant Or Right [Line Items]
Contractual term				11 months 16 days
Series F Convertible Preferred Stock | Minimum
Class Of Warrant Or Right [Line Items]
Contractual term				5 months 16 days
Pinnacle Ventures | Series B Convertible Preferred Stock | Series B Convertible Preferred Stock Warrants
Class Of Warrant Or Right [Line Items]
Warrants issued					125,565	157,538
Warrant exercise price						$ 2.1502753
Warrant expiration period						10 years
Pinnacle Ventures | Series B Convertible Preferred Stock | Series D Convertible Preferred Stock Warrants
Class Of Warrant Or Right [Line Items]
Warrants issued					125,565
Pinnacle Ventures | Series D Convertible Preferred Stock | Series B Convertible Preferred Stock Warrants
Class Of Warrant Or Right [Line Items]
Warrants issued					405,164
Warrant exercise price					$ 0.6663973
Warrant expiration date						Mar. 9, 2018
Pinnacle Ventures | Series D Convertible Preferred Stock | Series D Convertible Preferred Stock Warrants
Class Of Warrant Or Right [Line Items]
Warrants issued					405,164	210,084		210,084
Warrant exercise price					$ 0.6663973
Warrant expiration period					10 years
Borrowings								$ 3,500,000
Pinnacle Ventures | Series D Convertible Preferred Stock | Series D Convertible Preferred Stock Warrants | Expiration Date One
Class Of Warrant Or Right [Line Items]
Warrant expiration date					Mar. 9, 2018
Pinnacle Ventures | Series D Convertible Preferred Stock | Series D Convertible Preferred Stock Warrants | Expiration Date Two
Class Of Warrant Or Right [Line Items]
Warrant expiration date					Nov. 16, 2019
Pinnacle Ventures | Series F Convertible Preferred Stock | Series F Convertible Preferred Stock Warrants
Class Of Warrant Or Right [Line Items]
Warrants issued						646,551
Warrant exercise price						$ 0.928
Warrant expiration date						Apr. 5, 2023
Pinnacle Ventures | Series G Convertible Preferred Stock | Series G Convertible Preferred Stock Warrants
Class Of Warrant Or Right [Line Items]
Warrants issued			640,129
Warrant exercise price			$ 1.4314298
Warrant expiration date			Dec. 16, 2014
Pinnacle Ventures | Series G Convertible Preferred Stock | Series G Convertible Preferred Stock Warrants | Monte Carlo Simulation
Class Of Warrant Or Right [Line Items]
Fair value			$ 173,091
Risk-free interest rate			2.13%
Contractual term			9 years 8 months 16 days
Expected volatility			50.00%
Intel Corporation | Series C-1 Convertible Preferred Stock Warrants | Maximum
Class Of Warrant Or Right [Line Items]
Warrants issued						4,006,088
Intel Corporation | Series C-1 Convertible Preferred Stock | Series C-1 Convertible Preferred Stock Warrants
Class Of Warrant Or Right [Line Items]
Warrants issued						534,000			3,472,088
Warrant exercise price						$ 0.01
Warrant expiration date						Jan. 16, 2019
Preferred shares, vested									1,927,505
Preferred shares underlying warrants							1,000,000
Hercules Technology Growth Capital | Series G or Series H Convertible Preferred Stock | Series G or Series H Convertible Preferred Stock Warrants
Class Of Warrant Or Right [Line Items]
Warrants issued		196,831
Warrant exercise price		$ 1.4314298
Warrant expiration date		Jan. 3, 2025
Hercules Technology Growth Capital | Series G or Series H Convertible Preferred Stock | Series G or Series H Convertible Preferred Stock Warrants | Revolving Credit Facility
Class Of Warrant Or Right [Line Items]
Line of credit facility		$ 11,500,000
Hercules Technology Growth Capital | Series G or Series H Convertible Preferred Stock | Series G or Series H Convertible Preferred Stock Warrants | Monte Carlo Simulation
Class Of Warrant Or Right [Line Items]
Fair value		$ 50,000
Risk-free interest rate		2.06%
Contractual term		9 years 9 months 30 days
Expected volatility		50.00%
GLOBALFOUNDRIES U.S. Inc | Series G or Series H Convertible Preferred Stock | Series G or Series H Convertible Preferred Stock Warrants
Class Of Warrant Or Right [Line Items]
Warrants issued	9,756,160
Warrant exercise price	$ 0.01
Warrant expiration date	Mar. 25, 2025
Fair value	$ 12,000,000
Risk-free interest rate	1.03%
Contractual term	1 year
Expected volatility	35.00%
Expected dividends	0.00%
Warrant exercise date	2017-05

Convertible Preferred Stock W55

Convertible Preferred Stock Warrants - Schedule of Assumptions Used to Determine Fair Value of Convertible Preferred Stock (Details) - Convertible Preferred Stock Warrants - $ / shares	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Valuation method	Black-Scholes Pricing Model
Expected dividends	0.00%	0.00%
Minimum
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Risk-free interest rate	0.89%	0.39%
Expected term	4 months 24 days	3 months 19 days
Expected volatility	25.00%	25.00%
Maximum
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Risk-free interest rate	2.24%	2.25%
Expected term	7 years 10 months 25 days	9 years
Expected volatility	35.00%	50.00%
Convertible Preferred Series B
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Fair value of preferred stock	$ 0.98	$ 0.73
Convertible Preferred Series C One
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Fair value of preferred stock	0.98	0.73
Convertible Preferred Series D
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Fair value of preferred stock	0.98	0.78
Convertible Preferred Series F
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Fair value of preferred stock	0.98	0.91
Convertible Preferred Series G
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Fair value of preferred stock	$ 0.98	1.40
Convertible Preferred Series H
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Fair value of preferred stock		$ 1.43

Common Stock - Additional Infor

Common Stock - Additional Information (Details) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Class Of Stock [Line Items]
Common stock, shares authorized	316,000,000	307,000,000
Common stock, par value	$ 0.00001	$ 0.00001
Dividends declared	$ 0
Preferred stock convertible into common stock	20,816,754
Unrecognized stock compensation costs	$ 5,100,000	$ 2,400,000
Unrecognized stock compensation costs recognition period	3 years 3 months 18 days	2 years 9 months 19 days
Aggregate intrinsic value of options exercised	$ 1,200,000	$ 6,300,000
Weighted-average grant-date fair value of options granted	$ 2.94	$ 1.52
Equity Incentive Plans
Class Of Stock [Line Items]
Common stock, shares reserved for issuance	537,191	234,352
ISO
Class Of Stock [Line Items]
Stock option vesting period	12 months
Stock option installment period	36 months
Stock options expiration period	10 years
ISO | Share-based Compensation Award, Tranche One
Class Of Stock [Line Items]
Stock option vesting percentage	25.00%
ISO | Share-based Compensation Award, Tranche Three
Class Of Stock [Line Items]
Stock option vesting percentage	25.00%
ISO | Share-based Compensation Award, Tranche Two
Class Of Stock [Line Items]
Stock option vesting percentage	25.00%
ISO | Share Based Compensation Award Tranche Four
Class Of Stock [Line Items]
Stock option vesting percentage	25.00%
NSO
Class Of Stock [Line Items]
Stock options expiration period	10 years
Maximum
Class Of Stock [Line Items]
Common stock, shares authorized	316,000,000	307,000,000
Maximum | Equity Incentive Plans
Class Of Stock [Line Items]
Exercise price as percent of fair value of common stock	100.00%

Common Stock - Schedule of Comm

Common Stock - Schedule of Common Stock Reserved for Issuance (Details) - shares	Sep. 30, 2017	Dec. 31, 2016
Class Of Stock [Line Items]
Shares reserved for issuance	25,448,451	24,844,689
Convertible Preferred Stock
Class Of Stock [Line Items]
Shares reserved for issuance	20,816,754	19,841,138
Conversion of convertible preferred stock warrants
Class Of Stock [Line Items]
Shares reserved for issuance	584,148	1,559,764
Outstanding options to purchase common stock
Class Of Stock [Line Items]
Shares reserved for issuance	3,813,197	2,906,596
Future grants under stock option plans
Class Of Stock [Line Items]
Shares reserved for issuance	234,352	537,191

Common Stock - Summary of Conve

Common Stock - Summary of Convertible Preferred Stock Issued and Outstanding (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Temporary Equity [Line Items]
Carrying value	$ 210,269	$ 199,434
Convertible Preferred Series A
Temporary Equity [Line Items]
Convertible preferred stock, shares issued	18,664,514	18,664,514
Carrying value	$ 15,216	$ 15,216
Convertible preferred stock, shares outstanding	18,664,514	18,664,514
Convertible Preferred Series B
Temporary Equity [Line Items]
Convertible preferred stock, shares issued	12,049,428	12,049,428
Carrying value	$ 25,834	$ 25,834
Convertible preferred stock, shares outstanding	12,049,428	12,049,428
Convertible Preferred Series C One
Temporary Equity [Line Items]
Convertible preferred stock, shares issued	1,000,000	1,000,000
Carrying value	$ 922	$ 922
Convertible preferred stock, shares outstanding	1,000,000	1,000,000
Convertible Preferred Series D
Temporary Equity [Line Items]
Convertible preferred stock, shares issued	57,172,304	57,172,304
Carrying value	$ 37,950	$ 37,950
Convertible preferred stock, shares outstanding	57,172,304	57,172,304
Convertible Preferred Series E
Temporary Equity [Line Items]
Convertible preferred stock, shares issued	26,438,711	26,438,711
Carrying value	$ 22,608	$ 22,608
Convertible preferred stock, shares outstanding	26,438,711	26,438,711
Convertible Preferred Series F
Temporary Equity [Line Items]
Convertible preferred stock, shares issued	43,103,440	43,103,440
Carrying value	$ 40,017	$ 40,017
Convertible preferred stock, shares outstanding	43,103,440	43,103,440
Convertible Preferred Series G
Temporary Equity [Line Items]
Convertible preferred stock, shares issued	13,972,043	13,972,043
Carrying value	$ 19,917	$ 19,917
Convertible preferred stock, shares outstanding	13,972,043	13,972,043
Convertible Preferred Series H
Temporary Equity [Line Items]
Convertible preferred stock, shares issued	35,604,438	25,848,278
Carrying value	$ 47,805	$ 36,970
Convertible preferred stock, shares outstanding	35,604,438	25,848,278
Convertible Preferred Stock
Temporary Equity [Line Items]
Convertible preferred stock, shares issued	208,004,878	198,248,718
Carrying value	$ 210,269	$ 199,434
Convertible preferred stock, shares outstanding	208,004,878	198,248,718

Common Stock - Summary of Stock

Common Stock - Summary of Stock Option Plan (Details) - Outstanding options to purchase common stock - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares available for issuance, beginning balance	537,191
Number of shares available for issuance, shares authorized for grant	900,000
Number of shares, granted	(1,289,482)
Number of shares, canceled	86,643
Number of shares available for issuance, ending balance	234,352	537,191
Number of shares, beginning balance	2,906,596
Number of shares, granted	1,289,482
Number of shares, exercised	(296,238)
Number of shares, canceled	(86,643)
Number of shares, ending balance	3,813,197	2,906,596
Number of shares, vested and exercisable	1,548,378	1,208,989
Weighted average exercise price, beginning balance	$ 3.20
Weighted average exercise price, granted	7.04
Weighted average exercise price, exercised	2.86
Weighted average exercise price, canceled	4.27
Weighted average exercise price, ending balance	4.50	$ 3.20
Weighted average exercise price, vested and exercisable	$ 2.83	$ 2.40
Weighted average remaining contractual term	8 years 1 month 6 days	8 years 1 month 6 days
Weighted average remaining contractual term, vested and exercisable	6 years 9 months 18 days	6 years 10 months 25 days
Aggregate intrinsic value, beginning balance	$ 4,941
Aggregate intrinsic value, ending balance	15,699	$ 4,941
Aggregate intrinsic value, vested and exercisable	$ 13,283	$ 2,994

Stock-Based Compensation Expe60

Stock-Based Compensation Expense - Schedule of Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expense	$ 408	$ 257	$ 957	$ 706
Cost of Revenue
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expense	12	8	26	23
Research and Development
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expense	251	153	544	359
Sales and Marketing
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expense	46	24	110	70
General and Administrative
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expense	$ 99	$ 72	$ 277	$ 254

Stock-Based Compensation Expe61

Stock-Based Compensation Expense - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Income tax benefit associated with stock-based compensation expense	$ 0	$ 0	$ 0	$ 0

Stock-Based Compensation Expe62

Stock-Based Compensation Expense - Schedule of Fair Value Assumptions for Option Grants (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Risk-free interest rate, minimum	1.94%	1.24%	1.89%	1.46%
Risk-free interest rate, maximum	2.40%	1.58%	2.40%	1.88%
Expected dividends	0.00%	0.00%	0.00%	0.00%
Volatility		34.00%		34.00%
Volatility, minimum	27.00%		27.00%
Volatility, maximum	30.00%		30.00%
Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected term	6 years 1 month 6 days	6 years 1 month 6 days	6 years 1 month 6 days	6 years 1 month 6 days
Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected term	10 years	9 years 9 months 18 days	10 years	10 years

Income Taxes - Additional Infor

Income Taxes - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Tax Disclosure [Abstract]
Provision for (benefit from) income taxes	$ 27,000	$ (22,000)	$ (331,000)	$ 84,000
Federal net operating loss carryforwards	35,500,000		35,500,000
State net operating loss carryforwards	34,300,000		34,300,000
Federal research and development credits	1,800,000		1,800,000
Deferred tax assets recognized	$ 0		$ 0

Net Income (Loss) Per Share - S

Net Income (Loss) Per Share - Summary of Computation of Basic and Diluted Net Income (Loss) Per Share Attributable to Common Shareholders (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Earnings Per Share [Abstract]
Net income (loss) attributable to common stockholders	$ (1,005)	$ 88	$ (4,362)	$ (587)
Weighted-average shares used to compute net loss per share, basic	4,710	4,405	4,603	4,173
Net income (loss) per share attributable to common stockholders, basic	$ (0.21)	$ 0.02	$ (0.95)	$ (0.14)
Effect of potential dilutive shares:
Add stock options to purchase common stock		2,809
Add convertible preferred stock and warrant		21,154
Weighted-average number of shares outstanding—diluted	4,710	28,368	4,603	4,173
Net income (loss) per share attributable to common stockholders, diluted	$ (0.21)	$ 0	$ (0.95)	$ (0.14)

Net Income (Loss) Per Share -65

Net Income (Loss) Per Share - Summary of Potentially Dilutive Securities Outstanding Excluded from Computation of Diluted Weighted-average Shares Outstanding (Details) - shares	3 Months Ended	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2017	Sep. 30, 2016
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potential dilutive securities outstanding excluded from computation of diluted weighted-average shares outstanding	25,247,616	24,365,210	24,376,939
Outstanding options to purchase common stock
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potential dilutive securities outstanding excluded from computation of diluted weighted-average shares outstanding	3,846,714	3,407,444	2,808,653
Convertible Preferred Stock
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potential dilutive securities outstanding excluded from computation of diluted weighted-average shares outstanding	20,816,754	20,373,618	19,831,374
Conversion of convertible preferred stock warrants
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potential dilutive securities outstanding excluded from computation of diluted weighted-average shares outstanding	584,148	584,148	1,736,912

Segment and Geographic Inform66

Segment and Geographic Information - Additional Information (Details)	9 Months Ended
	Sep. 30, 2017Segment
Segment Reporting [Abstract]
Number of reportable segments	1

Segment and Geographic Inform67

Segment and Geographic Information - Schedule of Revenue from Segments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Segment Reporting Information [Line Items]
Revenue	$ 26,718	$ 22,534	$ 75,525	$ 63,908
Data Center
Segment Reporting Information [Line Items]
Revenue	14,912	16,500	47,672	45,759
Enterprise Infrastructure
Segment Reporting Information [Line Items]
Revenue	10,815	$ 6,034	26,190	$ 18,149
Access
Segment Reporting Information [Line Items]
Revenue	888		1,468
Automotive
Segment Reporting Information [Line Items]
Revenue	$ 103		$ 195

Segment and Geographic Inform68

Segment and Geographic Information - Schedule of Geographical Distribution of Revenue (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenues From External Customers And Long Lived Assets [Line Items]
Percentage of revenue	100.00%	100.00%	100.00%	100.00%
Malaysia
Revenues From External Customers And Long Lived Assets [Line Items]
Percentage of revenue	55.00%	52.00%	62.00%	60.00%
China
Revenues From External Customers And Long Lived Assets [Line Items]
Percentage of revenue	38.00%	34.00%	31.00%	28.00%
United States
Revenues From External Customers And Long Lived Assets [Line Items]
Percentage of revenue		11.00%	1.00%	6.00%
Other
Revenues From External Customers And Long Lived Assets [Line Items]
Percentage of revenue	7.00%	3.00%	6.00%	6.00%

Concentrations - Schedule of C

Concentrations - Schedule of Customer Concentration as Percentage of Accounts Receivable and Total Revenue (Details) - Customer Concentration Risk	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Accounts Receivable | Customer A
Concentration Risk [Line Items]
Concentration risk, percentage			41.00%		62.00%
Accounts Receivable | Customer B
Concentration Risk [Line Items]
Concentration risk, percentage			41.00%		23.00%
Revenue | Customer A
Concentration Risk [Line Items]
Concentration risk, percentage	54.00%	64.00%	61.00%	65.00%
Revenue | Customer B
Concentration Risk [Line Items]
Concentration risk, percentage	34.00%	25.00%	29.00%	24.00%

Related Party Transaction - Add

Related Party Transaction - Additional Information (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Related Party Transaction [Line Items]
Intangible assets, gross	$ 5,764	$ 5,764
IP license
Related Party Transaction [Line Items]
Intangible assets, gross	5,416	5,416
Significant Stockholder
Related Party Transaction [Line Items]
License agreement initial payment		2,000
License fees paid		2,100
Due to related parties	3,700	3,300
Research and development expenses, inventory and cost of revenue	$ 3,600	4,200
Significant Stockholder | IP license
Related Party Transaction [Line Items]
Intangible assets, gross		$ 5,400

Subsequent Event - Additional I

Subsequent Event - Additional Information (Details) $ / shares in Units, $ in Thousands	Nov. 08, 2017USD ($)	Nov. 07, 2017USD ($)$ / sharesshares	Oct. 05, 2017	Sep. 30, 2017USD ($)	Sep. 30, 2016USD ($)
Subsequent Event [Line Items]
Common stock reverse split ratio				0.10
Common stock reverse split ratio, description				1-for-10
Offering expense				$ 1,057	$ 2,174
Payment of outstanding indebtedness				$ 7,846	$ 4,053
Subsequent Event
Subsequent Event [Line Items]
Common stock reverse split ratio			0.10
Subsequent Event | IPO
Subsequent Event [Line Items]
Net proceeds from IPO		$ 65,600
Underwriters discounts and commissions		4,900
Offering expense		$ 5,400
Payment of outstanding indebtedness	$ 9,200
Subsequent Event | Common Stock | IPO
Subsequent Event [Line Items]
Number of shares issued | shares		7,840,700
Offering price per share | $ / shares		$ 9
Subsequent Event | Common Stock | Underwriters’ option
Subsequent Event [Line Items]
Number of shares issued | shares		1,022,700