Aquantia 10-Q 7 Nov 18 2018 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2018	Oct. 31, 2018
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2018
Document Fiscal Year Focus	2,018
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 Small Business	false
Entity Emerging Growth Company	true
Entity Ex Transition Period	true
Entity Common Stock, Shares Outstanding		34,854,563

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 8,842	$ 8,040
Short-term investments	58,507	48,362
Accounts receivable	15,781	15,012
Inventories	15,005	18,469
Prepaid expenses and other current assets	2,413	5,623
Total current assets	100,548	95,506
Property and equipment, net	10,423	9,973
Intangible assets, net	3,950	4,556
Other assets	679	331
Total assets	115,600	110,366
Current liabilities:
Accounts payable	5,644	7,059
Accrued liabilities	10,718	9,217
Total current liabilities	16,362	16,276
Other long-term liabilities	4,274	3,176
Total liabilities	20,636	19,452
Commitments and contingencies (Note 6)
Stockholders’ equity:
Additional paid-in capital	297,024	288,719
Accumulated other comprehensive loss	(120)	(96)
Accumulated deficit	(201,940)	(197,709)
Total stockholders’ equity	94,964	90,914
Total liabilities and stockholders’ equity	$ 115,600	$ 110,366

CONDENSED CONSOLIDATED BALANC_2

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Sep. 30, 2018	Dec. 31, 2017
Statement Of Financial Position [Abstract]
Common stock, par value	$ 0.00001	$ 0.00001
Common stock, shares authorized	95,000,000	400,000,000
Common stock, shares issued	34,821,975	33,523,683
Common stock, shares outstanding	34,821,975	33,523,683

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Statement [Abstract]
Revenue	$ 32,902	$ 26,718	$ 91,692	$ 75,525
Cost of revenue	13,866	11,616	39,021	32,575
Gross profit	19,036	15,102	52,671	42,950
Operating expenses:
Research and development	15,701	11,512	41,047	32,456
Sales and marketing	2,354	1,927	7,255	5,383
General and administrative	3,214	2,572	9,535	7,047
Total operating expenses	21,269	16,011	57,837	44,886
Loss from operations	(2,233)	(909)	(5,166)	(1,936)
Other income (expense):
Interest expense		(382)		(1,398)
Change in fair value of convertible preferred stock warrant liability		317		(1,383)
Other income (expense), net	311	(4)	850	24
Total other income (expense)	311	(69)	850	(2,757)
Loss before income tax expense	(1,922)	(978)	(4,316)	(4,693)
Provision for (benefit from) income taxes	143	27	(50)	(331)
Net loss	$ (2,065)	$ (1,005)	$ (4,266)	$ (4,362)
Net loss per share, basic and diluted	$ (0.06)	$ (0.21)	$ (0.13)	$ (0.95)
Weighted-average shares used to compute net loss per share, basic and diluted	34,435	4,710	33,925	4,603
Comprehensive loss:
Net loss	$ (2,065)	$ (1,005)	$ (4,266)	$ (4,362)
Other comprehensive income (loss), net of tax:
Unrealized gains (loss) - short-term investments	55	2	(24)
Comprehensive loss	$ (2,010)	$ (1,003)	$ (4,290)	$ (4,362)

CONDENSED CONSOLIDATED STATEM_2

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash flows from operating activities
Net loss	$ (4,266)	$ (4,362)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	4,271	3,422
Stock-based compensation expense	4,263	957
Change in fair value of convertible preferred stock warrant liability		1,383
Loss (gain) on disposal of fixed assets and lease impairment	(70)
Amortization of debt discount		286
Non-cash interest expense related to debt costs		139
Changes in operating assets and liabilities:
Accounts receivable	(769)	(894)
Inventories	3,464	(8,656)
Prepaid expenses and other assets	2,862	(2,367)
Accounts payable	(1,096)	356
Accrued and other liabilities	2,914	2,328
Net cash provided by (used in) operating activities	11,573	(7,408)
Cash flows from investing activities
Purchases of property and equipment	(4,434)	(2,952)
Proceeds from sales of Property and equipment	70
Proceeds from sales and maturities of short-term investments	32,488
Purchases of short-term investments	(42,657)	(1,850)
Net cash used in investing activities	(14,533)	(4,802)
Cash flows from financing activities
Repayments on short and long-term borrowings		(7,846)
Repayments on line of credit		(5,000)
Proceeds from line of credit		10,000
Proceeds from exercise of stock options, purchase rights, and preferred stock warrants	4,064	944
Purchases of IP licenses	(26)	(195)
Payment of costs related to initial public offering	(276)	(1,057)
Net cash provided by (used in) financing activities	3,762	(3,154)
Net increase (decrease) in cash and cash equivalents	802	(15,364)
Cash and cash equivalents at beginning of period	8,040	28,893
Cash and cash equivalents at end of period	8,842	13,529
Supplemental disclosures of cash flow information
Cash paid for interest	17	707
Cash paid for income taxes	193	41
Non-cash financing and investing transactions
Transfer of fair value of warrants to equity from liabilities upon warrant exercise		10,738
Cashless exercises of warrants, net of assumed proceeds from shares	1,175
Unpaid costs related to initial public offering		608
Property and equipment received and accrued	$ 100	$ 503

Organization, Description of Bu

Organization, Description of Business and Basis for Presentation	9 Months Ended
	Sep. 30, 2018
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 (“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 $5.7 million which were 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 and $0.3 million of the IPO proceeds, respectively, to repay the outstanding indebtedness under the Company’s loan from Pinnacle Ventures, L.L.C. and the termination fee for the line of credit from Hercules in 2017, respectively. 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 (“U.S. 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 U.S. GAAP have been condensed or omitted pursuant to such rules and regulations. The condensed consolidated balance sheet as of December 31, 2017 has been derived from the audited financial statements for the fiscal year then ended included in the Company’s Annual Report on Form 10-K filed with the SEC on March 7, 2018 (the “2017 Annual Report on Form 10-K”), but does not include all of the information and notes required by U.S. GAAP for complete consolidated 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, 2017 and the related notes thereto included in the 2017 Annual Report on Form 10-K.

Summary of Significant Accounti

Summary of Significant Accounting Policies	9 Months Ended
	Sep. 30, 2018
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	2. Summary of Significant Accounting Policies During the three and nine months ended September 30, 2018, there have been no changes in our significant accounting policies as described in the Company’s 2017Annual Report on Form 10-K, except as discussed below: Recent Accounting Pronouncements — In February 2018, the FASB released ASU 2018-2, “ Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income. In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842) Adopted Revenue Recognition — In May 2014, the FASB issued ASU 2014-09, “Revenue from Contracts with Customers” related to the recognition and reporting of revenue that establishes a comprehensive new revenue recognition model designed to depict the transfer of goods or services to a customer in an amount that reflects the consideration the entity expects to receive in exchange for those goods or services. The guidance allows for the use of either the full or modified retrospective transition method. This new standard was effective on January 1, 2018. Under the new standard, the Company used the modified retrospective method and recognizes all revenue on sales to distributors upon shipment and transfer of control (known as “sell-in” revenue recognition), rather than deferring recognition until distributor report that they have sold the product to their customers (known as “sell-through” revenue recognition). This change in methodology will cause a shift in the timing of when revenue is recognized for this class of customers comparing to prior periods. The Company provides some of its distributors rights that would result in a deferral of revenue under the revenue standards before the adoption. Accordingly, the Company recorded $0.1 million of deferred revenue balance to retained earnings upon adoption of this new standard on the Company’s condensed consolidated financial statements. As a result of the adoption, the Company revised its accounting policy for revenue recognition as detailed below: Revenue Recognition: Product revenues consist of sales to customers which are mainly comprised of end customers, their manufacturing subcontractors, and distributors. Revenue is recognized after the Company (a) identifies the contract with a customer, (b) identifies the performance obligations in the contract, (c) determines the transaction price, (d) allocates the transaction price to the performance obligations in the contract, and (e) satisfies the performance obligation when the control of products is transferred to the customer. The Company considers the purchase orders, which in some cases are governed by master sales agreements, to be the contract with its customers. In evaluating the existence of the contract, the Company considers various factors relative to the contract including the customer’s ability to pay amounts due under the contract. The Company is obligated to deliver a fixed number of products to its customers, each of which is distinct, and have been separately identified to be the performance obligations. The Company generally provides an assurance warranty that its products will substantially conform to the published specifications for twelve months from the date of shipment. The Company has not provided services in addition to the standard warranty. As such, the Company does not consider activities related to such warranty, if any, to be a separate performance obligation. In determining the transaction price, the Company considers the variability of the amount due under the contract including amounts subject to refund or adjustment when determining the net consideration to which the Company expects to be entitled within the contract. As the Company’s standard payment terms are less than one year, the Company has elected the practical expedient under the accounting guidance and does not assess whether the contract has a significant financing component. The Company allocates revenue to each product based on their relative standalone selling price. Frequently, the Company receives orders for products to be delivered over multiple dates that may extend across several reporting periods. The Company invoices for each delivery upon shipment and recognizes revenues for each distinct product delivered, assuming transfer of control has occurred. As scheduled delivery dates are within one year, under the optional exemption revenues allocated to future shipments of partially completed contracts are not disclosed. Sales to certain of end customers include limited rebates. The Company estimates these rebates, using historical volumes of such rebates, at the time revenue is recognized. Such rebates were not significant in any of the periods presented, and the differences between the actual amount of such rebates and our estimates also were not significant. Sales to most of our distributors are made under contracts that allow for pricing credits upon shipment to the end customer and rights of return for on hand inventory at the distributor. Under the accounting guidance, revenue is recognized at the point of transfer of control to the distributor, which typically occurs at the point of shipment. The Company adjusts the transaction price for any unprocessed claims and for future estimated pricing credits which is recorded in accrued liabilities on our condensed consolidated balance sheets. The adjustments for these estimates are recorded as a reduction to revenue in the same period when the related revenue is recorded and is calculated based on an analysis of the historical actual claims received, both in aggregate and at a distributor level to the extent that it is probable that a significant future reversal of revenue will not occur. Historically, adjustments for actual pricing credits and product returns have not been significantly differed from the amounts estimated by the Company. As of September 30, 2018, the Company has recorded an accrued liability of $0.6 million related to the above adjustments to transaction price.

Balance Sheet Components

Balance Sheet Components	9 Months Ended
	Sep. 30, 2018
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, 2018 2017 Processed wafers $ 1,536 $ 3,523 Work in process 6,733 10,118 Finished goods 6,736 4,828 Total inventories $ 15,005 $ 18,469 Prepaid expenses and other current assets consisted of the following (in thousands): As of September 30, As of December 31, 2018 2017 Processed wafer prepayments $ 521 $ 3,443 Electronic design automation tools 307 519 Other prepaid and other current assets 1,585 1,661 Total other prepaid and other current assets $ 2,413 $ 5,623 Property and equipment, net consisted of the following (in thousands): As of September 30, As of December 31, Estimated Useful Lives 2018 2017 Machinery and equipment 2-3 years $ 15,244 $ 13,268 Production masks 4 years 5,401 5,401 Software and computer equipment 3 years 4,223 3,820 Leasehold improvements Shorter of estimated life of asset or remaining lease term 1,546 539 Office furniture and fixtures 3 years 168 114 Total property and equipment 26,582 23,142 Less: accumulated depreciation and amortization (16,159 ) (13,169 ) Property and equipment, net $ 10,423 $ 9,973 Depreciation and amortization of property and equipment totaled $1.3 million and $1.0 million for the three months ended September 30, 2018 and 2017, respectively. Depreciation and amortization of property and equipment totaled $3.7 million and $2.8 million for the nine months ended September 30, 2018 and 2017, 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 2018 2017 IP license 7 years $ 5,416 $ 5,416 Patents 10-12 years 348 348 Total intangible assets 5,764 5,764 Less: accumulated amortization (1,814 ) (1,208 ) Intangible assets, net $ 3,950 $ 4,556 Amortization of intangible assets totaled $0.2 million and $0.2 million for the three months ended September 30, 2018 and 2017, respectively. Amortization of intangible assets totaled $0.6 million and $0.6 million for the nine months ended September 30, 2018 and 2017, respectively. Amortization expense related to amortizable intangibles in future periods as of September 30, 2018 is expected to be as follows (in thousands): 2018 (remaining) $ 202 2019 808 2020 808 2021 808 2022 and thereafter 1,324 Total $ 3,950 Accrued liabilities consisted of the following (in thousands): As of September 30, As of December 31, 2018 2017 Accrued compensation and related benefits $ 5,206 $ 5,242 Customer Deposit - 1,154 Accrued IP License 1,339 343 Accrued technical consulting and professional services 200 259 Accrued royalty, rebates and commission 278 287 Other accrued liabilities 3,695 1,932 Total accrued liabilities $ 10,718 $ 9,217

Financial Instruments

Financial Instruments	9 Months Ended
	Sep. 30, 2018
Investments All Other Investments [Abstract]
Financial Instruments	4. Financial Instruments The following is a summary of financial instruments (in thousands): As of September 30, 2018 Gross Gross Unrealized Unrealized Estimated Fair Cost Gains Losses Values Available-for sale securities Commercial Paper $ 9,883 $ — $ (8 ) $ 9,875 Money market funds 4,911 — — 4,911 Corporate bonds 49,242 — (112 ) 49,130 U.S. government securities 1,500 — — 1,500 Total available-for-sale securities $ 65,536 $ — $ (120 ) $ 65,416 Reported in: Cash and cash equivalents $ 6,909 Short-term investments 58,507 Total available-for-sale securities $ 65,416 As of December 31, 2017 Gross Gross Unrealized Unrealized Estimated Fair Cost Gains Losses Values Available-for sale securities Commercial paper $ 13,927 $ — $ (11 ) $ 13,916 Money market funds 1,269 — — 1,269 Corporate bonds 36,534 — (81 ) 36,453 U.S. government securities 2,489 — (4 ) 2,485 Total available-for-sale securities $ 54,219 $ — $ (96 ) $ 54,123 Reported in: Cash and cash equivalents $ 5,761 Short-term investments 48,362 Total available-for-sale securities $ 54,123 The contractual maturities of available-for-sale securities are presented in the following table (in thousands): As of September 30, 2018 Amortized Cost Basis Estimated Fair Value Due in one year or less $ 59,517 $ 59,408 Due between one and five years 6,019 6,008 $ 65,536 $ 65,416 Gross realized gains and gross realized losses on sales of available-for-sale securities for the three and nine months ended September 30, 2018 were not significant.

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2018
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, 2018 and December 31, 2017 (in thousands): As of September 30, 2018 Level 1 Level 2 Level 3 Total Financial asset— available-for-sales securities Money market funds $ 4,911 $ — $ — $ 4,911 Commercial Paper — 9,875 — 9,875 Corporate bonds — 49,130 — 49,130 U.S. government securities — 1,500 — 1,500 Total financial asset—available-for-sales securities $ 4,911 $ 60,505 $ — $ 65,416 As of December 31, 2017 Level 1 Level 2 Level 3 Total Financial asset— available-for-sales securities Money market funds $ 1,269 $ — $ — $ 1,269 Commercial paper — 13,916 — 13,916 Corporate bonds — 36,453 — 36,453 U.S. government securities — 2,485 — 2,485 Total financial asset—available-for-sales securities $ 1,269 $ 52,854 $ — $ 54,123 There were no transfers within the hierarchy during the nine months ended September 30, 2018 and the year ended December 31, 2017.

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2018
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 2024. 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, 2018 and 2017 was $0.4 million and $0.3 million, respectively. Rent expense for the nine months ended September 30, 2018 and 2017 was $1.4 million and $0.8 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, 2018, future minimum operating lease payments and purchase obligations are as follows (in thousands): Total Operating Purchase Lease and Purchase Leases Obligations Obligations 2018 (remaining) $ 138 $ 8,533 $ 8,671 2019 1,446 5,361 6,807 2020 1,496 3,981 5,477 2021 1,995 399 2,394 2022 and thereafter 4,251 — 4,251 Total $ 9,326 $ 18,274 $ 27,600 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, 2018 and December 31, 2017, no liability associated with such indemnifications had been recorded.

Shareholders' Equity and Share-

Shareholders' Equity and Share-based Compensation	9 Months Ended
	Sep. 30, 2018
Equity [Abstract]
Shareholders' Equity and Share-based Compensation	7 . Shareholder’s Equity and Share-based Compensation The Company’s certificate of incorporation as of September 30, 2018 authorized the Company to issue up to 95,000,000 shares of common stock and 5,000,000 shares of preferred stock, each at $0.00001 par value per share. The Company’s certificate of incorporation as of December 31, 2017 authorized the Company to issue up to 400,000,000 shares of common stock and 10,000,000 shares of preferred stock, each at $0.00001 par value per share. As of September 30, 2018, no preferred stock was outstanding. 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. No dividends have been declared to date. 2015 Equity Incentive Plan and 2004 Equity Incentive Plan Under the Company’s 2015 Equity Incentive Plan and 2004 Equity Incentive Plan, shares of common stock were reserved 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. 2017 Equity Incentive Plan In November 2017, the Company adopted the 2017 Equity Incentive Plan, or 2017 Plan, and all shares reserved for grant under the 2015 Equity Incentive Plan and 2004 Equity Incentive Plan were cancelled. The 2017 Plan had 3,294,919 common shares reserved, plus any shares subject to outstanding stock options or other stock awards that were granted under the 2015 Equity Incentive Plan and 2004 Equity Incentive Plan that were forfeited, terminate, expire or are otherwise not issued. In addition, the shares reserved under the 2017 Plan will automatically increase on the first day of each calendar year, beginning on January 1, 2018 and ending on January 1, 2027, by an amount equal to 5% of the total number of shares of the Company’s capital stock outstanding on the last day of the calendar month before the date of the automatic increase, or a lesser number of shares determined by the board of

Common Stock

Common Stock	9 Months Ended
	Sep. 30, 2018
Equity [Abstract]
Common Stock	8. Common Stock Stock Options Activity under the Company’s stock option plan is set forth below: Weighted- Weighted Average Average Remaining Aggregate Exercise Contractual Intrinsic Value Number of Shares Price Term (Years) (in thousands) Balance—December 31, 2017 3,733,544 $ 4.53 7.9 $ 25,386 Granted 1,000 $ 13.89 Exercised (756,540 ) $ 3.31 Canceled (597,834 ) $ 6.24 Balance—September 30, 2018 2,380,170 $ 4.49 7.2 $ 19,745 Vested and exercisable - September 30, 2018 1,500,147 $ 3.63 6.6 $ 13,736 Vested and exercisable - December 31, 2017 1,648,917 $ 2.89 6.7 $ 13,924 As of September 30, 2018, approximately $2.3 million of unrecognized stock compensation costs related to awards were expected to be recognized over a weighted-average period of 2.3 years. As of December 31, 2017, approximately $4.8 million of unrecognized stock compensation costs related to awards were expected to be recognized over a weighted-average period of 3.1 years. The aggregate intrinsic value of options exercised during the nine months ended September 30, 2018 was $6.8 million. The aggregate intrinsic value of options exercised during the year ended December 31, 2017 was $1.6 million. There were 1,000 share options granted during the nine months ended September 30, 2018 with the weighted-average grant-date fair value of $5.46 per share. The weighted-average grant-date fair value of options granted during the year ended December 31, 2017 was $2.94 per share. 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, 2018 2017 2018 2017 Risk-free interest rate 2.87% 1.94% - 2.40% 2.87% 1.89% - 2.40% Expected term 6.1 yrs 6.1 - 10.0 yrs 6.1 yrs 6.1 - 10.0 yrs Expected dividends 0% 0% 0% 0% Volatility 35% 27% - 30% 35% 27% - 30% Restricted Stock Unit Awards The Company grants restricted stock units (RSU) to employees and directors under the 2017 Plan. RSUs granted typically vest ratably over a four-year period and are converted into shares of the Company’s common stock upon vesting on a one-for-one basis subject to the recipient’s continued service to the Company over that period. The fair value of RSUs is determined using the fair value of the Company’s common stock on the date of the grant, reduced by the discounted present value of dividends expected to be declared before the awards vest. Compensation expense is recognized on a straight-line basis over the requisite service period of each grant. Each RSU award granted from the 2017 Plan will reduce the number of shares available for issuance under the 2017 Plan by one share. As of September 30, 2018, unamortized compensation expense related to RSU was approximately $15.9 million, to be recognized over 3.2 years. As of December 31, 2017, unamortized compensation expense related to RSU was approximately $0.4 million, to be recognized over 1.8 years. Activity under the Company’s RSU is set forth below : Number of Shares Balance—December 31, 2017 35,029 Granted 1,486,287 Released (23,429 ) Canceled (92,101 ) Balance—September 30, 2018 1,405,786 Employee Stock Purchase Plan Concurrent with the completion of the IPO in November 2017, the Company adopted the 2017 Employee Stock Purchase Plan, or ESPP. The total number of common stock reserved under the ESPP Plan was 1,317,967 shares. In addition, the shares reserved under the ESPP Plan will automatically increase on the first day of each calendar year, beginning on January 1, 2018 and ending on January 1, 2027, by the lesser of (i) an amount equal to 2% of the total number of shares of the Company’s capital stock outstanding on the last day of the calendar month before the date of the automatic increase, (ii) 1,000,000 shares of common stock, and (iii) a lesser number of shares determined by the board of directors prior to the date of such automatic increase. The ESPP allows eligible employees to purchase shares of the Company’s common stock at a discount through payroll deductions of up to 15% of their eligible compensation, subject to any plan limitations. The ESPP generally provides for offering periods and purchase periods every nine months, and at the end of each purchase period, employees are able to purchase shares at 85% of the lower of the fair market value of the Company’s common stock on the first trading day of the purchase period or on the last trading day of the offering period. Since the ESPP was established in November 2017, no shares were issued as of December 31, 2017. The total common stock issued under the ESPP for the nine months ended September 30, 2018 was approximately 208,000. For the three and nine months ended September 30, 2018, the calculated fair value of the shares for the ESPP was estimated using the Black-Scholes model with the following assumptions: risk-free interest rate of 2.09%, expected term of 0.5 year, expected dividends of 0% and volatility of 22%. As of September 30, 2018, unamortized compensation expense related to ESPP was approximately $0.1 million, to be recognized over approximately two months. As of December 31, 2017, unamortized compensation expense related to ESPP was approximately $0.5 million, to be recognized over approximately five months. The Company uses the straight-line vesting attribution method to record stock-based compensation expense. Stock-based compensation expense recognized in the condensed consolidated statements of operations and comprehensive loss for options, restricted stock units and ESPP was as follows (in thousands): Three Months Ended Nine Months Ended September 30, September 30, 2018 2017 2018 2017 Cost of revenue $ 44 $ 12 $ 90 $ 26 Research and development 1,326 251 2,420 544 Sales and marketing 239 46 512 110 General and administrative 514 99 1,241 277 Total $ 2,123 $ 408 $ 4,263 $ 957 No income tax benefit associated with stock-based compensation expense was recognized in the condensed consolidated statements of operations and comprehensive loss for the three and nine months ended September 30, 2018 and 2017.

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Income Taxes	9. Income Taxes The Company recorded an income tax provision of $0.1 million and $27,000 for the three months ended September 30, 2018 and 2017, respectively. The Company recorded an income tax benefit of $0.1 million and $0.3 million for the nine months ended September 30, 2018 and 2017, respectively. The income tax benefit for the three and nine months ended September 30, 2018 consisted primarily of a credit to foreign jurisdiction. As of September 30, 2018, 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, 2018. 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 Section 382 analysis in 2016 and determined ownership changes occurred in July 2005, November 2009 and August 2017, which resulted in reductions to the U.S. federal and California net operating losses of $34.9 million and $24.1 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. On December 22, 2017, the U.S. government enacted comprehensive tax legislation commonly referred to as the Tax Cuts and Jobs Act (the “Act”). The Act makes broad and complex changes to the U.S. tax code including, but not limited to: (1) reducing the U.S. federal corporate tax rate from 35 percent to 21 percent; (2) requiring companies to pay a one-time transition tax on certain unrepatriated earnings of foreign subsidiaries; (3) generally eliminating U.S. federal income taxes on dividends from foreign subsidiaries; (4) requiring current inclusion in U.S. federal taxable income of certain earnings of controlled foreign corporations; (5) eliminating the corporate alternative minimum tax, or AMT, and changing how existing AMT credits can be realized; (6) creating the base erosion anti-abuse tax, or BEAT, a new minimum tax; (7) creating a new limitation on deductible interest expense; and (8) changing rules related to uses and limitations of net operating loss carryforwards created in tax years beginning after December 31, 2017. As of December 31, 2017, the Company’s remeasured certain deferred tax assets and liabilities based on rates at which they are expected to reverse in the future, which is generally 21%. The rate reduction would generally take effect on January 1, 2018. Consequently, any changes in the U.S. corporate income tax rate will impact the carrying value of the deferred tax assets. Under the new corporate income tax rate of 21%, U.S. federal and state deferred tax assets decreased by approximately $15.7 million as of December 31, 2017 and the valuation allowance decreased by approximately the same amount. Due to the valuation allowance on the deferred tax assets, the provisional amount recorded related to the remeasurement was zero. As of December 31, 2017, the Company's foreign subsidiaries are in a cumulative deficit. Therefore, the one-time transition tax on deemed repatriation of previously untaxed accumulated earnings and profits of foreign subsidiaries has minimal impact on the Company. Undistributed earnings of foreign subsidiaries are determined to be reinvested indefinitely. Accounting for the transition tax and the conclusion on the Company’s indefinite reinvestment have been completed pursuant to the requirements of the Act. The SEC staff issued Staff Accountant Bulletin No. 118, or SAB 118, which provides guidance on accounting for the tax effects of the Act. SAB 118 provides a measurement period that should not extend beyond one year from the Act enactment date for companies to complete the accounting under ASC 740. In accordance with SAB 118, a company must reflect the income tax effects of those aspects of the Act for which the accounting under ASC 740 is complete. To the extent that a company’s accounting for certain income tax effects of the Act is incomplete but it is able to determine a reasonable estimate, it must record a provisional estimate in the financial statements. If a company cannot determine a provisional estimate to be included in the financial statements, it should continue to apply ASC 740 on the basis of the provisions of the tax laws that were in effect immediately before the enactment of the Act. As noted above, the Company has recorded a provisional amount associated with the deferred tax assets and related valuation allowance as of September 30, 2018. At September 30, 2018, the Company is still analyzing certain aspects of the Act including (a) provisions for Global Intangible Low-Taxed Income, or GILTI, wherein taxes on foreign income are imposed in excess of a deemed return on tangible assets of foreign corporations (including related accounting policy elections) and (b) state tax implications of the Act.

Net Loss Per Share

Net Loss Per Share	9 Months Ended
	Sep. 30, 2018
Earnings Per Share [Abstract]
Net Loss Per Share	10. Net Loss Per Share The following table summarizes the computation of basic and diluted net loss per share (in thousands, except per share data): Three Month Ended Nine Month Ended September 30, September 30, 2018 2017 2018 2017 Net loss $ (2,065 ) $ (1,005 ) $ (4,266 ) $ (4,362 ) Weighted-average common shares outstanding 34,435,298 4,709,642 33,925,443 4,603,146 Less: Shares subject to repurchase — — — — Weighted-average shares outstanding 34,435,298 4,709,642 33,925,443 4,603,146 Net loss per share, basic and diluted $ (0.06 ) $ (0.21 ) $ (0.13 ) $ (0.95 ) Basic net loss per share is computed by dividing the net loss by the weighted-average number of common shares outstanding for the period. Basic and diluted net loss per share is presented in conformity with the two-class method required for participating securities. Prior to the IPO, the holders of the Company’s convertible preferred stock were entitled to receive non-cumulative dividends, payable prior and in preference to any dividends on shares of the common stock. Any additional dividends would 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. After the IPO, all convertible preferred stocks were converted to common stock and the Company has one class of stock issued and 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): As of As of September 30, December 31, 2018 2017 Stock options to purchase common stock 2,380,170 3,733,544 Unvested restricted stock units 1,405,786 — Common stock warrants 83,695 584,148 Total 3,869,651 4,317,692

Segment Reporting

Segment Reporting	9 Months Ended
	Sep. 30, 2018
Segment Reporting [Abstract]
Segment Reporting	11. Segment Reporting 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, 2018 and December 31, 2017. The following table summarizes revenue by market (in thousands): Three Months Ended Nine Months Ended September 30, September 30, 2018 2017 2018 2017 Revenue by market: Data Center $ 17,509 $ 14,912 $ 48,875 $ 47,672 Enterprise Infrastructure 12,535 10,815 33,564 26,190 Access 2,600 888 8,707 1,468 Automotive 258 103 546 195 Total revenue $ 32,902 $ 26,718 $ 91,692 $ 75,525 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, 2018 2017 2018 2017 Malaysia 63 % 55 % 59 % 62 % China 27 38 25 31 United States 2 - 1 1 Other 8 7 15 6 Total 100 % 100 % 100 % 100 %

Concentrations

Concentrations	9 Months Ended
	Sep. 30, 2018
Risks And Uncertainties [Abstract]
Concentrations	12. Concentrations Credit —Financial instruments that potentially subject the Company to concentrations of credit risk consist primarily of cash and cash equivalents and accounts receivable. The Company’s cash equivalents consist of cash and money market accounts with a financial institution that management believes to be of high-credit quality; however, at times, balances exceed federally insured limits. Amounts held on deposit at financial institutions in excess of Federal Deposit Insurance Corporation-insured amounts were $44,000 and $0.9 million as of September 30, 2018 and December 31, 2017, respectively. 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, 2018 2017 Accounts Receivable: Customer A 44 % 49 % Customer B 35 34 Three Months Ended Nine Months Ended September 30, September 30, 2018 2017 2018 2017 Revenue: Customer A 50 % 54 % 50 % 61 % Customer B 30 34 29 29

Employee Benefit Plan

Employee Benefit Plan	9 Months Ended
	Sep. 30, 2018
Text Block [Abstract]
Employee Benefit Plan	13. Employee Benefit Plan The Company has established a 401(k) plan, which permits participants to make contributions by salary deduction pursuant to Section 401(k) of the Internal Revenue Code. The Company may, at its discretion, make matching contributions to the 401(k) Plan. The Company has made no contributions to the 401(k) Plan since its inception.

Related Party Transaction

Related Party Transaction	9 Months Ended
	Sep. 30, 2018
Related Party Transactions [Abstract]
Related Party Transaction	14. 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. As of December 31, 2017, the total balance due this stockholder was $3.4 million, which was included in accrued, accounts payable and other long-term liabilities. In May 2018, this stockholder ceased to be a beneficial owner of more than 5% of the outstanding common stock.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2018
Accounting Policies [Abstract]
Recent Accounting Pronouncements	Recent Accounting Pronouncements — In February 2018, the FASB released ASU 2018-2, “ Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income. In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842) Adopted
Revenue Recognition	Revenue Recognition — In May 2014, the FASB issued ASU 2014-09, “Revenue from Contracts with Customers” related to the recognition and reporting of revenue that establishes a comprehensive new revenue recognition model designed to depict the transfer of goods or services to a customer in an amount that reflects the consideration the entity expects to receive in exchange for those goods or services. The guidance allows for the use of either the full or modified retrospective transition method. This new standard was effective on January 1, 2018. Under the new standard, the Company used the modified retrospective method and recognizes all revenue on sales to distributors upon shipment and transfer of control (known as “sell-in” revenue recognition), rather than deferring recognition until distributor report that they have sold the product to their customers (known as “sell-through” revenue recognition). This change in methodology will cause a shift in the timing of when revenue is recognized for this class of customers comparing to prior periods. The Company provides some of its distributors rights that would result in a deferral of revenue under the revenue standards before the adoption. Accordingly, the Company recorded $0.1 million of deferred revenue balance to retained earnings upon adoption of this new standard on the Company’s condensed consolidated financial statements. As a result of the adoption, the Company revised its accounting policy for revenue recognition as detailed below: Revenue Recognition: Product revenues consist of sales to customers which are mainly comprised of end customers, their manufacturing subcontractors, and distributors. Revenue is recognized after the Company (a) identifies the contract with a customer, (b) identifies the performance obligations in the contract, (c) determines the transaction price, (d) allocates the transaction price to the performance obligations in the contract, and (e) satisfies the performance obligation when the control of products is transferred to the customer. The Company considers the purchase orders, which in some cases are governed by master sales agreements, to be the contract with its customers. In evaluating the existence of the contract, the Company considers various factors relative to the contract including the customer’s ability to pay amounts due under the contract. The Company is obligated to deliver a fixed number of products to its customers, each of which is distinct, and have been separately identified to be the performance obligations. The Company generally provides an assurance warranty that its products will substantially conform to the published specifications for twelve months from the date of shipment. The Company has not provided services in addition to the standard warranty. As such, the Company does not consider activities related to such warranty, if any, to be a separate performance obligation. In determining the transaction price, the Company considers the variability of the amount due under the contract including amounts subject to refund or adjustment when determining the net consideration to which the Company expects to be entitled within the contract. As the Company’s standard payment terms are less than one year, the Company has elected the practical expedient under the accounting guidance and does not assess whether the contract has a significant financing component. The Company allocates revenue to each product based on their relative standalone selling price. Frequently, the Company receives orders for products to be delivered over multiple dates that may extend across several reporting periods. The Company invoices for each delivery upon shipment and recognizes revenues for each distinct product delivered, assuming transfer of control has occurred. As scheduled delivery dates are within one year, under the optional exemption revenues allocated to future shipments of partially completed contracts are not disclosed. Sales to certain of end customers include limited rebates. The Company estimates these rebates, using historical volumes of such rebates, at the time revenue is recognized. Such rebates were not significant in any of the periods presented, and the differences between the actual amount of such rebates and our estimates also were not significant. Sales to most of our distributors are made under contracts that allow for pricing credits upon shipment to the end customer and rights of return for on hand inventory at the distributor. Under the accounting guidance, revenue is recognized at the point of transfer of control to the distributor, which typically occurs at the point of shipment. The Company adjusts the transaction price for any unprocessed claims and for future estimated pricing credits which is recorded in accrued liabilities on our condensed consolidated balance sheets. The adjustments for these estimates are recorded as a reduction to revenue in the same period when the related revenue is recorded and is calculated based on an analysis of the historical actual claims received, both in aggregate and at a distributor level to the extent that it is probable that a significant future reversal of revenue will not occur. Historically, adjustments for actual pricing credits and product returns have not been significantly differed from the amounts estimated by the Company. As of September 30, 2018, the Company has recorded an accrued liability of $0.6 million related to the above adjustments to transaction price.

Balance Sheet Components (Table

Balance Sheet Components (Tables)	9 Months Ended
	Sep. 30, 2018
Balance Sheets Components [Abstract]
Schedule of Inventories	Inventories consisted of the following (in thousands): As of September 30, As of December 31, 2018 2017 Processed wafers $ 1,536 $ 3,523 Work in process 6,733 10,118 Finished goods 6,736 4,828 Total inventories $ 15,005 $ 18,469
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, 2018 2017 Processed wafer prepayments $ 521 $ 3,443 Electronic design automation tools 307 519 Other prepaid and other current assets 1,585 1,661 Total other prepaid and other current assets $ 2,413 $ 5,623
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 2018 2017 Machinery and equipment 2-3 years $ 15,244 $ 13,268 Production masks 4 years 5,401 5,401 Software and computer equipment 3 years 4,223 3,820 Leasehold improvements Shorter of estimated life of asset or remaining lease term 1,546 539 Office furniture and fixtures 3 years 168 114 Total property and equipment 26,582 23,142 Less: accumulated depreciation and amortization (16,159 ) (13,169 ) Property and equipment, net $ 10,423 $ 9,973
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 2018 2017 IP license 7 years $ 5,416 $ 5,416 Patents 10-12 years 348 348 Total intangible assets 5,764 5,764 Less: accumulated amortization (1,814 ) (1,208 ) Intangible assets, net $ 3,950 $ 4,556
Schedule of Amortization Expense Related to Amortizable Intangibles In Future Periods	Amortization expense related to amortizable intangibles in future periods as of September 30, 2018 is expected to be as follows (in thousands): 2018 (remaining) $ 202 2019 808 2020 808 2021 808 2022 and thereafter 1,324 Total $ 3,950
Schedule of Accrued Liabilities	Accrued liabilities consisted of the following (in thousands): As of September 30, As of December 31, 2018 2017 Accrued compensation and related benefits $ 5,206 $ 5,242 Customer Deposit - 1,154 Accrued IP License 1,339 343 Accrued technical consulting and professional services 200 259 Accrued royalty, rebates and commission 278 287 Other accrued liabilities 3,695 1,932 Total accrued liabilities $ 10,718 $ 9,217

Financial Instruments (Tables)

Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2018
Investments All Other Investments [Abstract]
Summary of Financial Instruments	The following is a summary of financial instruments (in thousands): As of September 30, 2018 Gross Gross Unrealized Unrealized Estimated Fair Cost Gains Losses Values Available-for sale securities Commercial Paper $ 9,883 $ — $ (8 ) $ 9,875 Money market funds 4,911 — — 4,911 Corporate bonds 49,242 — (112 ) 49,130 U.S. government securities 1,500 — — 1,500 Total available-for-sale securities $ 65,536 $ — $ (120 ) $ 65,416 Reported in: Cash and cash equivalents $ 6,909 Short-term investments 58,507 Total available-for-sale securities $ 65,416 As of December 31, 2017 Gross Gross Unrealized Unrealized Estimated Fair Cost Gains Losses Values Available-for sale securities Commercial paper $ 13,927 $ — $ (11 ) $ 13,916 Money market funds 1,269 — — 1,269 Corporate bonds 36,534 — (81 ) 36,453 U.S. government securities 2,489 — (4 ) 2,485 Total available-for-sale securities $ 54,219 $ — $ (96 ) $ 54,123 Reported in: Cash and cash equivalents $ 5,761 Short-term investments 48,362 Total available-for-sale securities $ 54,123
Summary of Contractual Maturities of Available-for-sale Securities	The contractual maturities of available-for-sale securities are presented in the following table (in thousands): As of September 30, 2018 Amortized Cost Basis Estimated Fair Value Due in one year or less $ 59,517 $ 59,408 Due between one and five years 6,019 6,008 $ 65,536 $ 65,416

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2018
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, 2018 and December 31, 2017 (in thousands): As of September 30, 2018 Level 1 Level 2 Level 3 Total Financial asset— available-for-sales securities Money market funds $ 4,911 $ — $ — $ 4,911 Commercial Paper — 9,875 — 9,875 Corporate bonds — 49,130 — 49,130 U.S. government securities — 1,500 — 1,500 Total financial asset—available-for-sales securities $ 4,911 $ 60,505 $ — $ 65,416 As of December 31, 2017 Level 1 Level 2 Level 3 Total Financial asset— available-for-sales securities Money market funds $ 1,269 $ — $ — $ 1,269 Commercial paper — 13,916 — 13,916 Corporate bonds — 36,453 — 36,453 U.S. government securities — 2,485 — 2,485 Total financial asset—available-for-sales securities $ 1,269 $ 52,854 $ — $ 54,123

Commitments and Contingencies (

Commitments and Contingencies (Tables)	9 Months Ended
	Sep. 30, 2018
Commitments And Contingencies Disclosure [Abstract]
Schedule of Future Minimum Operating Lease Payments and Purchase Obligations	As of September 30, 2018, future minimum operating lease payments and purchase obligations are as follows (in thousands): Total Operating Purchase Lease and Purchase Leases Obligations Obligations 2018 (remaining) $ 138 $ 8,533 $ 8,671 2019 1,446 5,361 6,807 2020 1,496 3,981 5,477 2021 1,995 399 2,394 2022 and thereafter 4,251 — 4,251 Total $ 9,326 $ 18,274 $ 27,600

Common Stock (Tables)

Common Stock (Tables)	9 Months Ended
	Sep. 30, 2018
Equity [Abstract]
Summary of Stock Option Plan	Activity under the Company’s stock option plan is set forth below: Weighted- Weighted Average Average Remaining Aggregate Exercise Contractual Intrinsic Value Number of Shares Price Term (Years) (in thousands) Balance—December 31, 2017 3,733,544 $ 4.53 7.9 $ 25,386 Granted 1,000 $ 13.89 Exercised (756,540 ) $ 3.31 Canceled (597,834 ) $ 6.24 Balance—September 30, 2018 2,380,170 $ 4.49 7.2 $ 19,745 Vested and exercisable - September 30, 2018 1,500,147 $ 3.63 6.6 $ 13,736 Vested and exercisable - December 31, 2017 1,648,917 $ 2.89 6.7 $ 13,924
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, 2018 2017 2018 2017 Risk-free interest rate 2.87% 1.94% - 2.40% 2.87% 1.89% - 2.40% Expected term 6.1 yrs 6.1 - 10.0 yrs 6.1 yrs 6.1 - 10.0 yrs Expected dividends 0% 0% 0% 0% Volatility 35% 27% - 30% 35% 27% - 30%
Summary of Company 's RSU	Activity under the Company’s RSU is set forth below : Number of Shares Balance—December 31, 2017 35,029 Granted 1,486,287 Released (23,429 ) Canceled (92,101 ) Balance—September 30, 2018 1,405,786
Schedule of Stock-Based Compensation Expense	Stock-based compensation expense recognized in the condensed consolidated statements of operations and comprehensive loss for options, restricted stock units and ESPP was as follows (in thousands): Three Months Ended Nine Months Ended September 30, September 30, 2018 2017 2018 2017 Cost of revenue $ 44 $ 12 $ 90 $ 26 Research and development 1,326 251 2,420 544 Sales and marketing 239 46 512 110 General and administrative 514 99 1,241 277 Total $ 2,123 $ 408 $ 4,263 $ 957

Net Loss Per Share (Tables)

Net Loss Per Share (Tables)	9 Months Ended
	Sep. 30, 2018
Earnings Per Share [Abstract]
Summary of Computation of Basic and Diluted Net Loss Per Share Attributable to Common Shareholders	The following table summarizes the computation of basic and diluted net loss per share (in thousands, except per share data): Three Month Ended Nine Month Ended September 30, September 30, 2018 2017 2018 2017 Net loss $ (2,065 ) $ (1,005 ) $ (4,266 ) $ (4,362 ) Weighted-average common shares outstanding 34,435,298 4,709,642 33,925,443 4,603,146 Less: Shares subject to repurchase — — — — Weighted-average shares outstanding 34,435,298 4,709,642 33,925,443 4,603,146 Net loss per share, basic and diluted $ (0.06 ) $ (0.21 ) $ (0.13 ) $ (0.95 )
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): As of As of September 30, December 31, 2018 2017 Stock options to purchase common stock 2,380,170 3,733,544 Unvested restricted stock units 1,405,786 — Common stock warrants 83,695 584,148 Total 3,869,651 4,317,692

Segment Reporting (Tables)

Segment Reporting (Tables)	9 Months Ended
	Sep. 30, 2018
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, 2018 2017 2018 2017 Revenue by market: Data Center $ 17,509 $ 14,912 $ 48,875 $ 47,672 Enterprise Infrastructure 12,535 10,815 33,564 26,190 Access 2,600 888 8,707 1,468 Automotive 258 103 546 195 Total revenue $ 32,902 $ 26,718 $ 91,692 $ 75,525
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, 2018 2017 2018 2017 Malaysia 63 % 55 % 59 % 62 % China 27 38 25 31 United States 2 - 1 1 Other 8 7 15 6 Total 100 % 100 % 100 % 100 %

Concentrations (Tables)

Concentrations (Tables)	9 Months Ended
	Sep. 30, 2018
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, 2018 2017 Accounts Receivable: Customer A 44 % 49 % Customer B 35 34 Three Months Ended Nine Months Ended September 30, September 30, 2018 2017 2018 2017 Revenue: Customer A 50 % 54 % 50 % 61 % Customer B 30 34 29 29

Organization, Description of _2

Organization, Description of Business and Basis for Presentation - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	Nov. 07, 2017	Sep. 30, 2018	Sep. 30, 2017
Subsidiary Sale of Stock [Line Items]
Offering expense		$ 276	$ 1,057
Proceeds used to repay outstanding indebtedness			$ 7,846
IPO
Subsidiary Sale of Stock [Line Items]
Net proceeds from IPO	$ 65,600
Underwriting discounts and commissions	4,900
Offering expense	5,700
Proceeds used to repay outstanding indebtedness	9,200
Line of credit termination fee	$ 300
IPO | Common Stock
Subsidiary Sale of Stock [Line Items]
Number of shares issued	7,840,700
Offering price per share	$ 9
IPO | Common Stock | Underwriters
Subsidiary Sale of Stock [Line Items]
Number of shares issued	1,022,700

Summary of Significant Accoun_3

Summary of Significant Accounting Policies - Additional Information (Details) $ in Millions	Sep. 30, 2018USD ($)
Summary Of Significant Accounting Policy [Line Items]
Accrued liabilities	$ 0.6
ASU 2014-09
Summary Of Significant Accounting Policy [Line Items]
Deferred revenue balance to retained earnings upon adoption of new standard	$ 0.1

Balance Sheet Components - Sche

Balance Sheet Components - Schedule of Inventories (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Inventory Disclosure [Abstract]
Processed wafers	$ 1,536	$ 3,523
Work in process	6,733	10,118
Finished goods	6,736	4,828
Total inventories	$ 15,005	$ 18,469

Balance Sheet Components - Sc_2

Balance Sheet Components - Schedule of Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Prepaid Expense And Other Assets Current [Abstract]
Processed wafer prepayments	$ 521	$ 3,443
Electronic design automation tools	307	519
Other prepaid and other current assets	1,585	1,661
Total other prepaid and other current assets	$ 2,413	$ 5,623

Balance Sheet Components - Sc_3

Balance Sheet Components - Schedule of Property and Equipment, Net (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 26,582	$ 23,142
Less: accumulated depreciation and amortization	(16,159)	(13,169)
Property and equipment, net	10,423	9,973
Machinery and Equipment
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 15,244	13,268
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	$ 5,401	5,401
Software and Computer Equipment
Property Plant And Equipment [Line Items]
Property and equipment, estimated useful lives	3 years
Property and equipment, gross	$ 4,223	3,820
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	$ 1,546	539
Furniture and Fixtures
Property Plant And Equipment [Line Items]
Property and equipment, estimated useful lives	3 years
Property and equipment, gross	$ 168	$ 114

Balance Sheet Components - Addi

Balance Sheet Components - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Balance Sheets Components [Abstract]
Depreciation and amortization of property and equipment	$ 1.3	$ 1	$ 3.7	$ 2.8
Amortization of intangible assets	$ 0.2	$ 0.2	$ 0.6	$ 0.6

Balance Sheet Components - Sc_4

Balance Sheet Components - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Finite Lived Intangible Assets [Line Items]
Intangible assets, gross	$ 5,764	$ 5,764
Less: accumulated amortization	(1,814)	(1,208)
Intangible assets, net	$ 3,950	4,556
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 - Sc_5

Balance Sheet Components - Schedule of Amortization Expense Related to Amortizable Intangibles In Future Periods (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Finite Lived Intangible Assets Future Amortization Expense [Abstract]
2018 (remaining)	$ 202
2,019	808
2,020	808
2,021	808
2022 and thereafter	1,324
Intangible assets, net	$ 3,950	$ 4,556

Balance Sheet Components - Sc_6

Balance Sheet Components - Schedule of Accrued Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Accrued Liabilities Current [Abstract]
Accrued compensation and related benefits	$ 5,206	$ 5,242
Customer Deposit		1,154
Accrued IP License	1,339	343
Accrued technical consulting and professional services	200	259
Accrued royalty, rebates and commission	278	287
Other accrued liabilities	3,695	1,932
Total accrued liabilities	$ 10,718	$ 9,217

Financial Instruments - Summary

Financial Instruments - Summary of Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Schedule Of Available For Sale Securities [Line Items]
Cost	$ 65,536	$ 54,219
Gross Unrealized Losses	(120)	(96)
Estimated Fair Values	65,416	54,123
Commercial Paper
Schedule Of Available For Sale Securities [Line Items]
Cost	9,883	13,927
Gross Unrealized Losses	(8)	(11)
Estimated Fair Values	9,875	13,916
Money Market Fund
Schedule Of Available For Sale Securities [Line Items]
Cost	4,911	1,269
Estimated Fair Values	4,911	1,269
Corporate Bonds
Schedule Of Available For Sale Securities [Line Items]
Cost	49,242	36,534
Gross Unrealized Losses	(112)	(81)
Estimated Fair Values	49,130	36,453
U.S. Government Securities
Schedule Of Available For Sale Securities [Line Items]
Cost	1,500	2,489
Gross Unrealized Losses		(4)
Estimated Fair Values	1,500	2,485
Cash and Cash Equivalents
Schedule Of Available For Sale Securities [Line Items]
Estimated Fair Values	6,909	5,761
Short-term Investments
Schedule Of Available For Sale Securities [Line Items]
Estimated Fair Values	$ 58,507	$ 48,362

Financial Instruments - Summa_2

Financial Instruments - Summary of Contractual Maturities of Available-for-sale Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Amortized Cost Basis
Due in one year or less	$ 59,517
Due between one and five years	6,019
Cost	65,536	$ 54,219
Estimated Fair Values
Due in one year or less	59,408
Due between one and five years	6,008
Total	$ 65,416	$ 54,123

Financial Instruments - Additio

Financial Instruments - Additional Information (Details) - USD ($)	Sep. 30, 2018	Dec. 31, 2017
Investments Debt And Equity Securities [Abstract]
Available for sale securities, continuous loss position, 12 months or longer	$ 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, 2018	Dec. 31, 2017
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Estimated Fair Values	$ 65,416	$ 54,123
Corporate Bonds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Estimated Fair Values	49,130	36,453
Recurring Basis
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Estimated Fair Values	65,416	54,123
Recurring Basis | Money Market Fund
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Estimated Fair Values	4,911	1,269
Recurring Basis | Commercial Paper
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Estimated Fair Values	9,875	13,916
Recurring Basis | U.S. Government Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Estimated Fair Values	1,500	2,485
Recurring Basis | Corporate Bonds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Estimated Fair Values	49,130	36,453
Recurring Basis | Level 1
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Estimated Fair Values	4,911	1,269
Recurring Basis | Level 1 | Money Market Fund
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Estimated Fair Values	4,911	1,269
Recurring Basis | Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Estimated Fair Values	60,505	52,854
Recurring Basis | Level 2 | Commercial Paper
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Estimated Fair Values	9,875	13,916
Recurring Basis | Level 2 | U.S. Government Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Estimated Fair Values	1,500	2,485
Recurring Basis | Level 2 | Corporate Bonds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Estimated Fair Values	$ 49,130	$ 36,453

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Details) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
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 ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Commitments And Contingencies Disclosure [Abstract]
Rent expense	$ 400,000	$ 300,000	$ 1,400,000	$ 800,000
Liability associated with indemnifications	$ 0		$ 0		$ 0
Operating Leases, Indemnification Agreements, Description			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.

Commitments and Contingencies_2

Commitments and Contingencies - Schedule of Future Minimum Operating Lease Payments and Purchase Obligations (Details) $ in Thousands	Sep. 30, 2018USD ($)
Operating Leases
2018 (remaining)	$ 138
2,019	1,446
2,020	1,496
2,021	1,995
2022 and thereafter	4,251
Total	9,326
Purchase Obligations
2018 (remaining)	8,533
2,019	5,361
2,020	3,981
2,021	399
Total	18,274
Total Lease and Purchase Obligations
2018 (remaining)	8,671
2,019	6,807
2,020	5,477
2,021	2,394
2022 and thereafter	4,251
Total	$ 27,600

Shareholder's Equity and Share-

Shareholder's Equity and Share-based Compensation - Additional Information (Details) - USD ($)	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Common stock, shares authorized	95,000,000	400,000,000
Common stock, par value	$ 0.00001	$ 0.00001
Preferred stock, shares authorized	5,000,000	10,000,000
Preferred stock, par value	$ 0.00001	$ 0.00001
Preferred stock, shares outstanding	0
Dividends declared	$ 0
2015 Equity Incentive Plan and 2004 Equity Incentive Plan | Incentive Stock Options
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Exercise price determination description	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.
Exercise price per share	85.00%
Equity incentive plan expiration period	10 years
2015 Equity Incentive Plan and 2004 Equity Incentive Plan | Incentive Stock Options | Maximum
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Exercise price per share	100.00%
2015 Equity Incentive Plan and 2004 Equity Incentive Plan | Incentive Stock Options | Maximum | 10% stockholder
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Exercise price per share	110.00%
2015 Equity Incentive Plan and 2004 Equity Incentive Plan | Nonstatutory
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Equity incentive plan expiration period	10 years
2017 Equity Incentive Plan
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Vesting period	4 years
Common shares reserved	3,294,919
Percentage of increase in common shares reserved	5.00%
Shares available for grant	2,512,698
2017 Equity Incentive Plan | Maximum
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Exercise price per share	100.00%
Options granted exercise period	10 years
2017 Equity Incentive Plan | Maximum | 10% stockholder
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Exercise price per share	110.00%
Share-based Compensation Award, Tranche One | 2015 Equity Incentive Plan and 2004 Equity Incentive Plan | Incentive Stock Options
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Vesting percentage	25.00%
Vesting period	12 months
Share-based Compensation Award, Tranche Two | 2015 Equity Incentive Plan and 2004 Equity Incentive Plan | Incentive Stock Options
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Vesting percentage	25.00%
Vesting period	12 months
Share-based Compensation Award, Tranche Three | 2015 Equity Incentive Plan and 2004 Equity Incentive Plan | Incentive Stock Options
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Vesting percentage	25.00%
Vesting period	12 months
Share Based Compensation Award Tranche Four | 2015 Equity Incentive Plan and 2004 Equity Incentive Plan | Incentive Stock Options
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Vesting percentage	25.00%
Vesting period	12 months

Common Stock - Summary of Stock

Common Stock - Summary of Stock Option Plan (Details) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Granted	1,000
Incentive Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Beginning balance	3,733,544
Granted	1,000
Exercised	(756,540)
Canceled	(597,834)
Ending balance	2,380,170	3,733,544
Number of shares, vested and exercisable	1,500,147	1,648,917
Weighted average exercise price, beginning balance	$ 4.53
Weighted average exercise price, granted	13.89
Weighted average exercise price, exercised	3.31
Weighted average exercise price, canceled	6.24
Weighted average exercise price, ending balance	4.49	$ 4.53
Weighted average exercise price, vested and exercisable	$ 3.63	$ 2.89
Weighted average remaining contractual term	7 years 2 months 12 days	7 years 10 months 24 days
Weighted average remaining contractual term, vested and exercisable	6 years 7 months 6 days	6 years 8 months 12 days
Aggregate intrinsic value	$ 19,745	$ 25,386
Aggregate intrinsic value, vested and exercisable	$ 13,736	$ 13,924

Common Stock - Additional Infor

Common Stock - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017	Nov. 07, 2017
Class Of Stock [Line Items]
Unrecognized stock compensation costs	$ 2,300,000		$ 2,300,000		$ 4,800,000
Unrecognized stock compensation costs recognition period			2 years 3 months 18 days		3 years 1 month 6 days
Aggregate intrinsic value of options exercised			$ 6,800,000		$ 1,600,000
Granted			1,000
Weighted-average grant-date fair value of options granted			$ 5.46		$ 2.94
Risk-free interest rate	2.87%		2.87%
Expected term	6 years 1 month 6 days		6 years 1 month 6 days
Expected dividends	0.00%	0.00%	0.00%	0.00%
Expected volatility rate	35.00%		35.00%
Income tax benefit associated with stock-based compensation expense	$ 0	$ 0	$ 0	$ 0
2017 Equity Incentive Plan
Class Of Stock [Line Items]
Vesting period			4 years
Description of restricted stock unit awards conversion basis upon vesting			one-for-one
Common shares reserved	3,294,919		3,294,919
ESPP
Class Of Stock [Line Items]
Unrecognized stock compensation costs recognition period			2 months		5 months
Unamortized compensation expense to be recognized	$ 100,000		$ 100,000		$ 500,000
Common shares reserved	1,000,000		1,000,000			1,317,967
Percentage of shares of capital stock outstanding			2.00%
Percentage of payroll deduction on eligible compensation			15.00%
Percentage of shares purchased at fair market value of common stock			85.00%
Shares issued under plan					0
Risk-free interest rate	2.09%		2.09%
Expected term	6 months		6 months
Expected dividends	0.00%		0.00%
Expected volatility rate	22.00%		22.00%
ESPP | Common Stock
Class Of Stock [Line Items]
Shares issued under plan			208,000
Restricted Stock Unit Awards | 2017 Equity Incentive Plan
Class Of Stock [Line Items]
Unrecognized stock compensation costs recognition period			3 years 2 months 12 days		1 year 9 months 18 days
Vesting period			4 years
Unamortized compensation expense to be recognized	$ 15,900,000		$ 15,900,000		$ 400,000

Common Stock - Schedule of Fair

Common Stock - Schedule of Fair Value Assumptions for Option Grants (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Risk-free interest rate	2.87%		2.87%
Risk-free interest rate, minimum		1.94%		1.89%
Risk-free interest rate, maximum		2.40%		2.40%
Expected term	6 years 1 month 6 days		6 years 1 month 6 days
Expected dividends	0.00%	0.00%	0.00%	0.00%
Volatility	35.00%		35.00%
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
Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected term		10 years		10 years

Common Stock - Summary of Compa

Common Stock - Summary of Company 's RSU (Details) - Restricted Stock Unit Awards	9 Months Ended
	Sep. 30, 2018shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares, beginning balance	35,029
Number of shares, Granted	1,486,287
Number of shares, Released	(23,429)
Number of shares, Canceled	(92,101)
Number of shares, ending balance	1,405,786

Common Stock - Schedule of Stoc

Common Stock - Schedule of Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expense	$ 2,123	$ 408	$ 4,263	$ 957
Cost of Revenue
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expense	44	12	90	26
Research and Development
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expense	1,326	251	2,420	544
Sales and Marketing
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expense	239	46	512	110
General and Administrative
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expense	$ 514	$ 99	$ 1,241	$ 277

Income Taxes - Additional Infor

Income Taxes - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Operating Loss Carryforwards [Line Items]
Provision for (benefit from) income taxes	$ 143,000	$ 27,000	$ (50,000)	$ (331,000)
Federal net operating loss carryforwards					$ 34,900,000
State net operating loss carryforwards					24,100,000
Federal research and development credits					$ 1,800,000
Deferred tax assets recognized	$ 0		$ 0
Federal tax at statutory rate			21.00%		35.00%
Amount of deferred tax assets decreased					$ 15,700,000
Provisional amount recorded related to the remeasurement					$ 0
Minimum
Operating Loss Carryforwards [Line Items]
Change in ownership percentage			50.00%

Net Loss Per Share - Summary of

Net Loss Per Share - Summary of Computation of Basic and Diluted Net 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, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share [Abstract]
Net loss	$ (2,065)	$ (1,005)	$ (4,266)	$ (4,362)
Weighted-average common shares outstanding	34,435,298	4,709,642	33,925,443	4,603,146
Weighted-average shares outstanding	34,435,298	4,709,642	33,925,443	4,603,146
Net loss per share, basic and diluted	$ (0.06)	$ (0.21)	$ (0.13)	$ (0.95)

Net Loss Per Share - Summary _2

Net Loss Per Share - Summary of Potentially Dilutive Securities Outstanding Excluded from Computation of Diluted Weighted-average Shares Outstanding (Details) - shares	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potential dilutive securities outstanding excluded from computation of diluted weighted-average shares outstanding	3,869,651	4,317,692
Incentive Stock Options
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potential dilutive securities outstanding excluded from computation of diluted weighted-average shares outstanding	2,380,170	3,733,544
Unvested Restricted Stock Units
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potential dilutive securities outstanding excluded from computation of diluted weighted-average shares outstanding	1,405,786
Common 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	83,695	584,148

Segment Reporting (Details)

Segment Reporting (Details)	9 Months Ended
	Sep. 30, 2018Segment
Segment Reporting [Abstract]
Number of reportable segments	1

Segment Reporting - Schedule of

Segment Reporting - Schedule of Revenue from Segments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Segment Reporting Information [Line Items]
Revenue	$ 32,902	$ 26,718	$ 91,692	$ 75,525
Data Center
Segment Reporting Information [Line Items]
Revenue	17,509	14,912	48,875	47,672
Enterprise Infrastructure
Segment Reporting Information [Line Items]
Revenue	12,535	10,815	33,564	26,190
Access
Segment Reporting Information [Line Items]
Revenue	2,600	888	8,707	1,468
Automotive
Segment Reporting Information [Line Items]
Revenue	$ 258	$ 103	$ 546	$ 195

Segment Reporting - Schedule _2

Segment Reporting - Schedule of Geographical Distribution of Revenue (Details) - Revenue - Geographic Concentration Risk	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
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	63.00%	55.00%	59.00%	62.00%
China
Revenues From External Customers And Long Lived Assets [Line Items]
Percentage of revenue	27.00%	38.00%	25.00%	31.00%
United States
Revenues From External Customers And Long Lived Assets [Line Items]
Percentage of revenue	2.00%		1.00%	1.00%
Other
Revenues From External Customers And Long Lived Assets [Line Items]
Percentage of revenue	8.00%	7.00%	15.00%	6.00%

Concentrations - Additional Inf

Concentrations - Additional Information (Details) - USD ($)	Sep. 30, 2018	Dec. 31, 2017
Risks And Uncertainties [Abstract]
Amounts held on deposit at financial institutions in excess of FDIC insured limits	$ 44,000	$ 900,000

Concentrations - Schedule of Cu

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, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Accounts Receivable | Customer A
Concentration Risk [Line Items]
Concentration risk, percentage			44.00%		49.00%
Accounts Receivable | Customer B
Concentration Risk [Line Items]
Concentration risk, percentage			35.00%		34.00%
Revenue | Customer A
Concentration Risk [Line Items]
Concentration risk, percentage	50.00%	54.00%	50.00%	61.00%
Revenue | Customer B
Concentration Risk [Line Items]
Concentration risk, percentage	30.00%	34.00%	29.00%	29.00%

Employee Benefit Plan - Additio

Employee Benefit Plan - Additional Information (Details)	9 Months Ended
	Sep. 30, 2018USD ($)
401 (k)
Defined Contribution Plan Disclosure [Line Items]
Company contribution	$ 0

Related Party Transaction - Add

Related Party Transaction - Additional Information (Details) - Significant Stockholder - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	May 31, 2018	Dec. 31, 2016	Dec. 31, 2017
Related Party Transaction [Line Items]
License agreement initial payment		$ 2
Due to related parties			$ 3.4
Minimum
Related Party Transaction [Line Items]
Beneficial ownership percentage of outstanding common stock	5.00%