ADESTO TECHNOLOGIES (IOTS) 10-Q 10 May 18 2018 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2018	May 02, 2018
Document and Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q1
Trading Symbol	IOTS
Entity Registrant Name	ADESTO TECHNOLOGIES CORP
Entity Central Index Key	1,395,848
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		21,454,826

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 29,546	$ 30,078
Accounts receivable, net	12,188	8,668
Inventories	7,554	5,814
Prepaid expenses	1,153	993
Other current assets	55	52
Total current assets	50,496	45,605
Property and equipment, net	7,632	7,183
Intangible assets, net	6,808	7,102
Other non-current assets	1,029	900
Goodwill	22	22
Total assets	65,987	60,812
Current liabilities:
Accounts payable	7,845	7,075
Accrued compensation and benefits	2,819	2,614
Accrued expenses and other current liabilities	2,506	2,359
Price adjustments and other revenue reserves	4,545
Line of credit, current	1,500	1,500
Term loan, current	1,929	926
Total current liabilities	21,144	14,474
Term loan, non-current	9,924	10,908
Other non-current liabilities	75	75
Deferred rent, non-current	2,294	2,404
Deferred tax liability, non-current	2	1
Total liabilities	33,439	27,862
Commitments and contingencies (See Note 8)
Stockholders’ equity:
Common stock, $0.0001 par value, 100,000,000 shares authorized; 21,409,292 and 21,291,833 shares issued and outstanding as of March 31, 2018 and December 31, 2017 respectively	2	2
Additional paid-in capital	133,804	133,087
Accumulated other comprehensive loss	(312)	(295)
Accumulated deficit	(100,946)	(99,844)
Total stockholders’ equity	32,548	32,950
Total liabilities and stockholders’ equity	$ 65,987	$ 60,812

CONDENSED CONSOLIDATED BALANCE3

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Mar. 31, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares issued	21,409,292	21,409,292
Common stock, shares outstanding	21,291,833	21,291,833

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Statement [Abstract]
Revenue, net	$ 15,302	$ 11,307
Cost of revenue	8,122	5,753
Gross profit	7,180	5,554
Operating expenses:
Research and development	3,665	3,372
Sales and marketing	2,752	2,600
General and administrative	1,713	2,135
Total operating expenses	8,130	8,107
Loss from operations	(950)	(2,553)
Other (expense):
Interest expense, net	(141)	(213)
Other income, net	10	18
Total other (expense), net	(131)	(195)
Loss before provision for income taxes	(1,081)	(2,748)
Provision for income taxes	21	27
Net loss	$ (1,102)	$ (2,775)
Net loss per share:
Basic and diluted	$ (0.05)	$ (0.18)
Weighted average number of shares used in computing net loss per share:
Basic and diluted	21,370,927	15,642,286

CONDENSED CONSOLIDATED STATEME5

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net loss	$ (1,102)	$ (2,775)
Other comprehensive loss, net of tax:
Foreign currency translation adjustment	(17)	(22)
Comprehensive loss	$ (1,119)	$ (2,797)

CONDENSED CONSOLIDATED STATEME6

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flows from operating activities:
Net loss	$ (1,102)	$ (2,775)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense	443	824
Depreciation and amortization	488	304
Amortization of intangible assets	294	309
Amortization of debt discount	19	24
Deferred income taxes	1
Gain on sale of equipment	(18)
Changes in assets and liabilities:
Accounts receivable	(3,520)	49
Inventories	(1,740)	886
Prepaid expenses and other current assets	(163)	(194)
Other non-current assets	(129)	(79)
Accounts payable	125	225
Accrued compensation and benefits	205	187
Accrued expenses and other current liabilities	147	24
Price adjustments and other revenue reserves	4,545
Deferred rent	(110)	(101)
Net cash used in operating activities	(515)	(317)
Cash flows from investing activities:
Acquisition of property and equipment	(293)	(605)
Net cash used in investing activities	(293)	(605)
Cash flows from financing activities:
Proceeds from exercise of stock options and employee stock purchase plan	329	258
Tax withholdings related to net share settlement of restricted stock units	(55)
Proceeds from revolving line of credit	1,500	11,374
Payments on revolving line of credit	(1,500)	(11,283)
Payments on term loan		(1,636)
Net cash provided by (used in )financing activities	274	(1,287)
Effect of exchange rates on cash and equivalents	2	(13)
Net decrease in cash and cash equivalents	(532)	(2,222)
Cash and cash equivalents - beginning of period	30,078	19,719
Cash and cash equivalents - end of period	29,546	17,497
Supplemental disclosures of other cash flow information:
Cash paid for interest expense	137	199
Supplemental disclosures of non-cash investing and financing information:
Purchase of property and equipment included in accounts payable	$ 1,065	$ 219

Organization and Summary of Sig

Organization and Summary of Significant Accounting Policies	3 Months Ended
	Mar. 31, 2018
Organization Consolidation and Presentation of Financial Statements [Abstract]
Organization and Summary of Significant Accounting Policies	Note 1. Organization and Summary of Significant Accounting Policies. Organization and Nature of Operations. Adesto Technologies Corporation (together with its subsidiaries; “Adesto”, “we”, “our”, “us” or the “Company”) was incorporated in the state of California in January 2006 and reincorporated in Delaware in October 2015. We are a leading provider of application-specific and, ultra-low power non-volatile memory (“NVM”) products. Our corporate headquarters are located in Santa Clara, California. On September 28, 2012, we purchased certain flash memory product assets from Atmel Corporation and our financial results include the operating results of those assets from the date of acquisition. Basis of Presentation. The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) for interim financial information and with the instructions to Form 10‑Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by U.S. GAAP to complete annual consolidated financial statements. In the opinion of our management, all adjustments (consisting of normal recurring adjustments) considered necessary to present fairly the financial position of the Company and its results of operations and cash flows for the interim periods presented have been included. Operating results for the three months ended March 31, 2018 are not necessarily indicative of the results that may be expected for the year ending December 31, 2018, for any other interim period or for any other future year. The condensed consolidated balance sheet as of December 31, 2017 was derived from the audited consolidated financial statements as of that date, but does not include all of the disclosures required by U.S. GAAP. The accompanying condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto contained in the Company’s Annual Report on Form 10‑K for the year ended December 31, 2017, filed with the Securities and Exchange Commission on March 13, 2018. The condensed consolidated financial statements include the results of our operations, and the operations of our wholly owned subsidiaries. All intercompany balances and transactions have been eliminated. There have been no material changes to our significant accounting policies described in Note 1, Organization and Summary of Significant Accounting Policies, in Notes to Consolidated Financial Statements in Item 8 of Part II of our Annual Report on Form 10‑K for the year ended December 31, 2017 that have had a material impact on our condensed consolidated financial statements and related notes, except as described below. Recent Accounting Pronouncements. In February 2018, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2018-02, Income Statement—Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income. This ASU allows a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the Tax Cuts and Jobs Act. This ASU is effective for fiscal years beginning after December 15, 2018 and interim periods within those fiscal years. The Company expects that the adoption will not have a material impact on its consolidated financial statements. In January 2017, the FASB issued ASU No. 2017-04, Intangibles—Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment. This ASU eliminates Step 2 from the goodwill impairment test. Instead, an entity should recognize an impairment charge for the amount by which the carrying value exceeds the reporting unit’s fair value, not to exceed the total amount of goodwill allocated to that reporting unit. This ASU is effective for annual or any interim goodwill impairment tests in fiscal years beginning after December 15, 2019. The Company is currently evaluating the effect of the adoption of this ASU, but anticipates that the adoption will not have a material impact on its consolidated financial statements. In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. This ASU requires instruments measured at amortized cost to be presented at the net amount expected to be collected. Entities are also required to record allowances for available-for-sale debt securities rather than reduce the carrying amount. This ASU is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. The Company expects that the adoption will not have a material impact on its consolidated financial statements. In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842). The core principle of Topic 842 is that a lessee should recognize the assets and liabilities that arise from leases. For operating leases, a lessee is required to recognize a right-of-use asset and a lease liability, initially measured at the present value of the lease payments, in the statement of financial position. This ASU is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. The Company is evaluating the effect that the adoption of this ASU will have on its financial statements. The Company currently expects that most of its operating lease commitments will be subject to the new standard and recognized as right-of-use assets and operating lease liabilities upon the adoption of ASU 2016-02, which will increase the total assets and total liabilities that it reports relative to such amounts prior to adoption. Recently Adopted Accounting Pronouncements. Adoption of ASC 606: In May 2014, the FASB issued an ASU on revenue from contracts with customers, ASU No. 2014-09, Revenue from Contracts with Customers (“Topic 606”). This standard update outlines a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers. The guidance is effective for annual reporting periods including interim reporting reports beginning after December 15, 2017. Collectively, we refer to Topic 606, its related amendments and Subtopic 340-40 as the “new standard”. On January 1, 2018, we adopted the new standard using the modified retrospective method applied to all contracts that are not completed contracts at the date of initial application (i.e., January 1, 2018). Results for reporting periods after January 1, 2018 are presented under the new standard, while prior period amounts are not adjusted and continue to be reported in accordance with our historic accounting. There was no impact on the opening accumulated deficit as of January 1, 2018 due to the adoption of the new standard. We reclassified the allowance for ship from stock and debits (“SSDs”), price protection, rights of return and other activities to current liabilities presented as "Price adjustments and other revenue reserves" from the allowance for accounts receivable due to the adoption of the new standard. We recorded s cumulative effect adjustment to our January 1, 2018 condensed consolidated balance sheet for the impact of the reclassification of the allowance for SSDs, price protection, rights of return and other activities to current liabilities presented as “Price adjustments and other revenue reserves”. The cumulative effect of the changes made to our January 1, 2018 condensed consolidated balance sheet for the adoption of the new revenue standard were as follows (in thousands): Balance at Adjustments Balance at December 31, Due to January 1, 2017 ASC 606 2018 Accounts receivable, net $ 8,668 $ 3,832 $ 12,500 Price adjustments and other revenue reserves $ — $ (3,832) $ (3,832) In accordance with the new standard requirements, the disclosure of the impact of adoption on select condensed consolidated balance sheet line items was as follows (in thousands): As of March 31, 2018 As Balances without Effect of Reported ASC 606 Change Accounts receivable, net $ 12,188 $ 7,643 $ (4,545) Price adjustments and other revenue reserves $ 4,545 $ — $ 4,545 Revenue Recognition. Revenue is recognized when control of the promised goods or services is transferred to customers, in an amount that reflects the consideration we expect to be entitled to in exchange for those goods or services. Sales of products with alternative use account for the majority of our revenue and are recognized at a point in time, the timing of such recognition remained the same under Topic 606. Taxes assessed by a governmental authority that are both imposed on and concurrent with a specific revenue-producing transaction, that are collected by us from a customer and deposited with the relevant government authority, are excluded from revenue. Our revenue arrangements do not contain significant financing components. Revenue is recognized over a period of time when it is assessed that performance obligations are satisfied over a period rather than at a point in time. When any of the following criteria is fulfilled, revenue is recognized over a period of time: (a) The customer simultaneously receives and consumes the benefits provided by the performance as Adesto performs. (b) Adesto’s performance creates or enhances an asset (for example, work in process) that the customer controls as the asset is created or enhanced. (c) Adesto’s performance does not create an asset with an alternative use, and Adesto has an enforceable right to payment for performance completed to date. If revenue is recognized over a period of time, we would then select an appropriate method for measuring progress toward complete satisfaction of the performance obligation, usually costs incurred to date relative to the total expected costs to the satisfaction of that performance obligation. Typically, our revenue is recognized at a point in time. Sales to certain distributors are made under arrangements which provide the distributors with price adjustments, price protection, stock rotation and other allowances under certain circumstances. These adjustments and allowances are accounted for as variable consideration. We estimate these amounts based on the expected amount to be provided to customers and reduce revenue recognized. We believe that there will not be significant changes to our estimates of variable consideration. If a customer pays consideration, or Adesto has a right to an amount of consideration that is unconditional before we transfer a good or service to the customer, those amounts are classified as deferred income/ advances received from customers which are included in other current liabilities or other long-term liabilities when the payment is made or it is due, whichever is earlier. If the arrangement includes variable contingent consideration, we recognize revenue over time if we can reasonably measure its progress, or we are capable of providing reliable information that would be required to apply an appropriate method of measuring progress. To date, we have not had any arrangements incorporating contingent consideration. Practical Expedients and Elections Sales commissions are owed and are recorded at the time of sell through of our products to end customers. These costs are recorded within sales and marketing expenses. We do not disclose the value of unsatisfied performance obligations for (i) contracts with an original expected length of one year or less and (ii) contracts for which we recognize revenue at the amount to which we have the right to invoice for services performed. We have elected to account for shipping and handling costs as fulfillment costs after the customer obtains control of the goods. These costs are recorded in cost of revenue. Reclassifications. Certain reclassifications have been made to prior periods’ consolidated financial statements to conform to the current period presentation. These reclassifications did not result in any change in previously reported total assets, stockholders’ equity or net loss. Use of Estimates. The preparation of consolidated financial statements in conformity with U.S. GAAP requires management to make estimates, judgments and assumptions that affect the reported amount of assets, liabilities, revenue and expenses and related disclosures of contingent assets and liabilities. On an on-going basis, we evaluate those estimates, including those related to allowances for doubtful accounts, reserves for sales, warranty accrual, inventory write-downs, valuation of long-lived assets, including property and equipment and identifiable intangible assets and goodwill, loss on purchase commitments, valuation of deferred taxes and contingencies. In addition, we use assumptions when employing the Black-Scholes option-pricing model to calculate the fair value of stock options granted and Monte Carlo simulation techniques to value certain restricted stock units with performance-based vesting conditions. We base our estimates of the carrying value of certain assets and liabilities on historical experience and on various other assumptions that are believed to be reasonable under the circumstances, when these carrying values are not readily available from other sources. Actual results could differ from these estimates. Product Warranty. Our products are sold with a limited warranty for a period of one year, warranting that the product conforms to specifications and is free from material defects in design, materials and workmanship. To date, we have had insignificant returns of any defective production parts. During the year ended December 31, 2015, we recorded $250,000 for a specific potential warranty claim. During the years ended December 31, 2017 and 2016, $185,000 and $41,000, respectively, has been incurred relating to this potential warranty claim and during the year ended December 31, 2017 we recorded $27,000 for an additional potential warranty claim. As of March 31, 2018 and December 31, 2017, the warranty accrual was $51,000 and is included in accrued expenses and other current liabilities on the condensed consolidated balance sheets. Foreign Currency Translation. The functional currency of our foreign subsidiaries is the local currency. In consolidation, we translate assets and liabilities at exchange rates in effect at the consolidated balance sheet date. We translate revenue and expense accounts at the average exchange rates during the period in which the transaction takes place. Net losses from foreign currency translation of assets and liabilities were $17,000 and $22,000 for the three months ended March 31, 2018 and 2017, respectively, and are included in the cumulative translation adjustment component of accumulated other comprehensive loss, net of tax, a component of stockholders’ equity. Net gains and losses arising from transactions denominated in currencies other than the functional currency were a loss of $8,000 and a gain of $13,000 for the three months ended March 31, 2018 and 2017, respectively, and are included in other expense, net in the condensed consolidated statements of operations. Concentration of Risk. Our products are primarily manufactured, assembled and tested by third-party foundries and other contractors in Asia and we are heavily dependent on a single foundry in Taiwan for the manufacture of wafers and a single contractor in the Philippines for assembly and testing of our products. We do not have long-term agreements with either of these suppliers. A significant disruption in the operations of these parties would adversely impact the production of our products for a substantial period of time, which could have a material adverse effect on our business, financial condition, operating results and cash flows. Financial instruments that potentially subject us to significant concentrations of credit risk consist principally of cash and cash equivalents and accounts receivables. We place substantially all of our cash and cash equivalents on deposit with a reputable, high credit quality financial institution in the United States of America. We believe that the bank that holds substantially all of our cash and cash equivalents is financially sound and, accordingly, subject to minimal credit risk. Deposits held with the bank may exceed the amount of insurance provided on such deposits. We generally do not require collateral or other security in support of accounts receivable. We periodically review the need for an allowance for doubtful accounts by considering factors such as historical experience, credit quality, the age of the accounts receivable balances and current economic conditions that may affect a customer’s ability to pay. As a result of our favorable collection experience and customer concentration, there was no allowance for doubtful accounts as of March 31, 2018 and December 31, 2017. Customer concentrations as a percentage of revenue, net were as follows: Three Months Ended March 31, 2018 2017 Customer A 18 % 18 % Customer B * 11 % Customer C * 11 % * Customer concentrations as a percentage of gross accounts receivable were as follows: March 31, December 31, 2018 2017 Customer A 26 % 31 % Customer B * * Customer C * * *

Balance Sheet Components

Balance Sheet Components	3 Months Ended
	Mar. 31, 2018
Balance Sheet Related Disclosures [Abstract]
Balance Sheet Components	Note 2. Balance Sheet Components. Accounts Receivable, Net. Accounts receivable, net consisted of the following (in thousands): March 31, December 31, 2018 2017 Accounts receivable $ 12,188 $ 12,500 Allowance for SSDs, price protection, rights of return and other activities — (3,832) Total accounts receivable, net $ 12,188 $ 8,668 As of March 31, 2018 we have no allowance for doubtful accounts on any of our accounts receivable, net. Inventories. Inventories consisted of the following (in thousands): March 31, December 31, 2018 2017 Raw materials $ 1,955 $ 2,213 Work-in-process 3,700 2,408 Finished goods 1,899 1,193 Total inventories $ 7,554 $ 5,814 For the three months ended March 31, 2018 and 2017, we realized a benefit of $0.4 million and $0.4 million, respectively, from the sales of previously reserved products. Inventory write-downs were primarily associated with products built in excess of customer demand which resulted in excess inventory levels, legacy products for which no demand exists and lower of cost or net realizable value write-downs associated with Conductive Bridging Random Access Memory (“CBRAM”) products for which costs exceeded net realizable value. Property and Equipment, Net. Property and equipment, net consisted of the following (in thousands): March 31, December 31, 2018 2017 Machinery and equipment $ 9,850 $ 9,457 Leasehold improvements 4,252 4,252 Computer software 675 675 TowerJazz license 350 350 Furniture and fixtures 83 83 Construction in progress 1,301 1,301 Property and equipment, at cost 16,511 16,118 Accumulated depreciation and amortization (8,879) (8,935) Property and equipment, net $ 7,632 $ 7,183 The Company incurs costs for the fabrication of masks used by its foundry partners to manufacture its products. Beginning the first fiscal quarter of 2017, the Company capitalizes mask costs that are expected to be utilized in production manufacturing as the Company’s product development process has become more predictable and thus supports capitalization of the mask. The capitalized mask costs begin depreciating to cost of revenue once the products go into production. Depreciation is computed using the straight-line method over a three year period which is the expected useful life of the mask. Previously mask sets were expensed to research and development. Depreciation and amortization expense of property and equipment for the three months ended March 31, 2018 and 2017 was $0.5 million and $0.3 million, respectively. Accrued Expenses and Other Current Liabilities. Accrued expenses and other current liabilities consisted of the following (in thousands): March 31, December 31, 2018 2017 Accrued sales commission payable $ 273 $ 310 Accrued manufacturing expenses 310 265 Deferred rent, current portion 431 422 Liabilities to certain customers 732 468 Other accrued liabilities 760 894 Total accrued expenses and other current liabilities $ 2,506 $ 2,359

Fair Value Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2018
Fair Value Disclosures [Abstract]
Fair Value Measurements	Note 3. Fair Value Measurements. Fair value is defined as the exchange price that would be received from selling an asset or paid to transfer a liability in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. We measure financial assets and liabilities at fair value at each reporting period using a fair value hierarchy which requires us to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. A financial instrument’s classification within the fair value hierarchy is based upon the lowest level of input that is significant to the fair value measurement. Three levels of inputs may be used to measure fair value: Level 1. Quoted prices in active markets for identical assets or liabilities. Level 2. Quoted prices for similar assets and liabilities in active markets or inputs other than quoted prices which are observable for the assets or liabilities, either directly or indirectly through market corroboration, for substantially the full term of the financial instruments. Level 3. Unobservable inputs which are supported by little or no market activity and which are significant to the fair value of the assets or liabilities. Financial assets measured at fair value on a recurring basis were as follows: Fair Value Measurement at Reporting Date Using Significant Quoted Prices in Other Significant Active Markets Observable Unobservable for Identical Inputs Inputs Assets (Level 1) (Level 2) (Level 3) Total (in thousands) As of March 31, 2018 Assets: Money market funds $ 11,511 $ — $ — $ 11,511 As of December 31, 2017 Assets: Money market funds $ 11,501 $ — $ — $ 11,501 As of March 31, 2018 and December 31, 2017, we had no financial liabilities measured at fair value on a recurring basis.

Intangible Assets, net

Intangible Assets, net	3 Months Ended
	Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Purchased Intangible Assets	Note 4. Intangible Assets, net. In 2012, in connection with our purchase of the serial flash memory product line assets from Atmel Corporation, we recorded $16.4 million of intangible assets. Intangible assets, net were as follows (in thousands): March 31, 2018 Estimated Useful Gross Carrying Accumulated Net Carrying Developed technology 10 $ 4,282 $ 2,355 $ 1,927 Customer relationships 12 9,011 4,130 4,881 Customer backlog 1 2,779 2,779 — Non-compete agreement 5 282 282 — Total intangible assets subject to amortization $ 16,354 $ 9,546 $ 6,808 December 31, 2017 Estimated Useful Gross Carrying Accumulated Net Carrying Developed technology 10 $ 4,282 $ 2,249 $ 2,033 Customer relationships 12 9,011 3,942 5,069 Customer backlog 1 2,779 2,779 — Non-compete agreement 5 282 282 — Total intangible assets subject to amortization $ 16,354 $ 9,252 $ 7,102 We recorded amortization expense related to the acquisition-related intangible assets as follows (in thousands): Three Months Ended March 31, 2018 2017 Operating expense category: Research and development $ 106 $ 122 Sales and marketing 188 187 Total $ 294 $ 309 The estimated future amortization expense of acquisition-related intangible assets subject to amortization after March 31, 2018 is as follows (in thousands): Year Ended December 31, 2018 (remaining 9 months) $ 885 2019 1,179 2020 1,179 2021 1,179 2022 1,072 Thereafter 1,314 Total $ 6,808

Investment in Unconsolidated Af

Investment in Unconsolidated Affiliates	3 Months Ended
	Mar. 31, 2018
Investments, All Other Investments [Abstract]
Investment in Unconsolidated Affiliates	Note 5. Investment in Unconsolidated Affiliates. During 2017 and 2016, we made investments in Semitech Semiconductor Pty. Ltd., an Australian corporation (“Semitech”), as part of a license and development agreement dated April 16, 2016. Semitech has developed Narrowband-Power Line Communications (“N-PLC”) products and market knowledge in the N-PLC devices space and plans to sell its products into the smart grid, solar, smart lighting and industrial space. Investments during 2016 through June 14, 2017 were recorded as notes receivable. On June 15, 2017, $0.4 million of notes receivable and accrued interest were converted into 233,335 shares of preferred stock in Semitech. This investment is recorded at cost in other non-current assets on the condensed consolidated balance sheets as of March 31, 2018. As of March 31, 2018 and 2017, we held investments in notes receivable in the amount of $0.3 million and $0.3 million, respectively, which were classified in other non-current assets on the condensed consolidated balance sheets.

Borrowings

Borrowings	3 Months Ended
	Mar. 31, 2018
Debt Disclosure [Abstract]
Borrowings	Note 6. Borrowings. Western Alliance Bank Term Loan. The Company is a party to that certain Business Financing Agreement dated July 7, 2016, by and between Western Alliance Bank and the Company, as amended (“Credit Facility”). The Credit Facility originally provided for (i) a term loan of up to $18.0 million (the “Term Loan”) and (ii) a revolving credit line advance (the “Line of Credit”) in the aggregate amount of the lower of (x) $2.0 million and (y) 80% of certain of the Company’s receivables. Prior to the Amendment (as defined below), the Term Loan bore interest at a rate per annum equal to the greater of the prime rate or 3.5%, plus 0.75% (5.00% on September 30, 2017), and was scheduled to mature in June 2019. Prior to the Amendment, the Line of Credit bore interest at a rate per annum equal to the greater of the prime rate or 3.5% plus 0.50% (4.75% on September 30, 2017), and was scheduled to mature in July 2018. Prior to the Amendment, we made interest-only payments on the Term Loan from July 2016 through September 2016 and began making interest payments and principal payments in 33 equal monthly installments starting October 2016. Prior to the Amendment, the Credit Facility provided that any indebtedness we incurred thereunder was collateralized by substantially all assets of the Company and any domestic subsidiaries, subject to certain customary exceptions. We paid a facility fee of $150,000 as well as a $25,000 diligence fee upon entry into the Credit Facility and an additional $10,000 on July 7, 2017. These fees have been recorded as a debt discount and are being amortized over the life of the agreement. The Credit Facility contains customary representations and warranties and affirmative and negative covenants. Among other negative covenants, prior to the Amendment, the Credit Facility provided that we may not (i) permit the ratio of the balance of unrestricted cash deposited at the financial institution, plus eligible receivables, net of reserve to the total amounts owed with respect to advances under the revolving credit line to be less than 1.50 to 1.00 and (ii) permit cash held at the financial institution in a deposit account to be less than 100% of the term loan outstanding. Upon an occurrence of an event of default, under the Credit Facility we could be required to pay interest on all outstanding obligations under the agreement at a rate of 5% above the otherwise applicable interest rate, and the lender may accelerate our obligations under the agreement. Due to the existence of the Lockbox Agreement and the lender’s ability to accelerate our obligations under the Credit Facility upon an event of default, we have classified the line of credit as a current liability. On September 29, 2017, we amended the Credit Facility by entering into that certain Second Business Financing Modification Agreement, dated September 29, 2017 (the “Amendment”) with Western Alliance Bank. The Amendment extended the maturity dates of the Line of Credit and the Term Loan to July 2019 and September 2021, respectively, from July 2018 and June 2019, respectively. In addition, the Amendment increased the amount available under the Line of Credit in the aggregate amount to $5.0 million. As part of this amendment we incurred additional fees of $125,000. These fees have been recorded as a debt discount and are being amortized over the life of the agreement. During the three months ended March 31, 2018, the amortization of the debt discount was $18,000 and the unamortized debt discount was $0.1 million as of March 31, 2018. The Amendment also decreased the interest rates under the Term Loan and the Line of Credit and changed the payment schedule under the Term Loan. The Term Loan bears interest at a rate per annum equal to the greater of the prime rate or 3.5% (4.75% on March 31, 2018). The Line of Credit bears interest at a rate per annum equal to the greater of the prime rate or 3.5% plus 0.25% (5.0% on March 31, 2018). Under the Amendment, we will make interest-only payments on the Term Loan from October 10, 2017 and on the 10th calendar day of each month thereafter, and will make principal and interest payments in 36 equal installments beginning on October 10, 2018, and on the 10th calendar day of each month thereafter, until the maturity date of the Term Loan. Pursuant to the Amendment, our Intellectual Property (as defined in the Amendment) is excluded from the collateral used to secure the indebtedness we incurred under the Credit Facility. Under the Amendment, we have agreed to modified and additional negative covenants, requiring us to maintain a ratio of at least 1.25 to 1.00 with respect to either of the following: (x) the sum of our cash and certain receivables to our indebtedness under the Credit Facility; or (y) our Adjusted EBITDA (as defined in the Amendment), less certain capital expenditures, to the sum of (a) all principal payments and interest expense that we would have owed to the Lender if the Term Loan’s amortization were to start on September 29, 2017, all measured on a trailing 4-quarter basis, plus (b) all principal payments and interest expense on any of our other debt. The Amendment also subjects us to the requirement that our quarterly revenues shall not negatively deviate more than 25% from the projections provided to Western Alliance Bank in accordance with the Credit Facility. As of March 31, 2018, we were in compliance with all financial covenants and restrictions. Outstanding borrowings consisted of the following (in thousands): March 31, December 31, 2018 2017 Term loan, current $ 1,929 $ 926 Term loan, non-current 9,924 10,908 Line of credit 1,500 1,500 Total $ 13,353 $ 13,334 Future repayments on outstanding borrowings (excluding unamortized discount of $147,000 as of March 31, 2018) are as follows (in thousands): Year Ended December 31, 2018 (remaining 9 months) $ 1,000 2019 5,500 2020 4,000 2021 3,000 $ 13,500 Interest expense incurred under our borrowings was $ 154 ,000 and $223,000 for the three months ended March 31, 2018 and 2017, respectively. On May 9, 2018 we entered into a new $35 million credit facility and terminated this facility. See Note 14 - Subsequent Events.

Segment Information

Segment Information	3 Months Ended
	Mar. 31, 2018
Segment Reporting [Abstract]
Segment Information	Note 7. Segment Information. We operate in one business segment, application-specific, ultra-low power NVM products. Our chief decision-maker, the President and Chief Executive Officer, evaluates our performance based on company-wide consolidated results. Revenue is evaluated based on product category and by geographic region. All of our revenue results from contracts with customers; we have no additional sources of revenue. Product revenue from customers is disaggregated based on the geographic region to which the product is delivered. Revenue by geographic region was as follows (in thousands): Three Months Ended March 31, 2018 2017 United States $ 2,702 $ 2,809 Rest of Americas 135 61 Europe 3,286 1,868 Asia Pacific 9,125 6,471 Rest of world 54 98 Total $ 15,302 $ 11,307 Long-lived assets are attributed to the geographic region were they are located. Long-lived assets by geographic region were as follows (in thousands): March 31, December 31, 2018 2017 United States $ 5,237 $ 5,424 Asia Pacific 2,395 1,759 Europe — — Total property and equipment, net $ 7,632 $ 7,183

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Note 8. Commitments and Contingencies. Operating Leases. The Company leases office facilities under various non-cancelable operating lease agreements. Certain lease agreements contain free or escalating rent payment provisions. The Company recognizes rent expense under such leases on a straight-line basis over the term of the lease with the difference between the expense and the payments recorded as deferred rent on the consolidated balance sheets. Any reimbursements by the landlord for tenant improvements are considered lease incentives, the balance of which is recorded as a lease incentive obligation within deferred rent on the consolidated balance sheets, and amortized as a reduction of rent expense over the life of the lease. Lease renewal periods are considered on a lease-by-lease basis in determining the lease term. On November 2, 2015, the Company entered into a lease with Peterson Ridge LLC pursuant to which the Company leased a new headquarters facility, consisting of an aggregate of approximately 34,000 square feet of space in Santa Clara, California. The initial term of the lease commenced on November 2, 2015 and is scheduled to end on July 31, 2023 and may be extended, at the Company’s option, for an additional five-year period following the initial lease term. Pursuant to the lease, monthly base rental payments due under the lease were approximately $93,000 per month between August 1, 2016 and February 27, 2017, with annual increases of approximately 3% thereafter. The Company must also pay for certain other operating costs under the lease, including operating expenses, taxes, assessments, insurance, utilities, securities and property management fees. Peterson Ridge LLC is obligated to reimburse the Company for up to approximately $2.5 million of the Company’s out-of-pocket costs associated with any tenant improvements, as defined in the lease. The Company was reimbursed for this amount during the year ended December 31, 2016. As of March 31, 2018 and 2017, the Company recorded a lease incentive obligation of $1.9 million and $2.3 million, respectively, in deferred rent on the condensed consolidated balance sheets. Rent expense under operating leases was $0.2 million and $0.2 million for the three months ended March 31, 2018 and 2017, respectively. 3 Total 2018 2019 2020 2021 2022 Thereafter (in thousands) Operating leases $ 6,808 $ 929 $ 1,225 $ 1,249 $ 1,287 $ 1,325 $ 793 Purchase Commitments. As of March 31, 2018, we had purchase commitments with our third-party foundries of $4.4 million due within one year, $0.4 million for a licensing and development agreement, and $0.4 million in conjunction with an agreement with TowerJazz Panasonic Semiconductor Company. Litigation. We 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. We accrue amounts that we believe are adequate to address any liabilities related to legal proceedings and other loss contingencies that we believe will result in a probable loss that is reasonably estimable. Indemnification. During the normal course of business, we may make certain indemnities, commitments and guarantees which may include intellectual property indemnities to certain of our customers in connection with the sales of our products and indemnities for liabilities associated with the infringement of other parties’ technology based upon our products. Our exposure under these indemnification provisions is generally limited to the total amount paid by a customer under the agreement. However, certain agreements include indemnification provisions that could potentially expose us to losses in excess of the amount received under the agreement. In addition, we indemnify our officers, directors and certain key employees while they are serving in good faith in such capacities. We have not recorded any liability for these indemnities, commitments and guarantees in the accompanying condensed consolidated balance sheets. Where necessary, we accrue for losses for any known contingent liabilities, including those that may arise from indemnification provisions, when future payment is probable.

Common Stock, Common Stock Warr

Common Stock, Common Stock Warrants and Stock Option Plan	3 Months Ended
	Mar. 31, 2018
Equity [Abstract]
Common Stock, Common Stock Warrants and Stock Option Plan	Note 9. Common Stock, Common Stock Warrants and Stock Option Plan. Common Stock. We are authorized to issue 100,000,000 shares of common stock with $0.0001 par value per share as of March 31, 2018 and December 31, 2017. Each holder of common stock is entitled to one vote per share. As of March 31, 2018, no dividends have been declared by the Board of Directors, however, the holders of common stock are also entitled to receive dividends, when and if declared by our Board of Directors. We completed a follow-on offering of our common stock in June 2017. We sold 5,000,000 shares, including 625,000 shares upon exercise of the underwriters’ option to purchase additional shares. The shares were sold at a public offering price of $4.00 per share for net proceeds of $18.4 million to us, after deducting underwriting discounts, commissions and offering expenses. Common Stock Reserved for Future Issuance. As of March 31, 2018 and December 31, 2017, we had reserved shares of common stock for future issuances as follows: March 31, December 31, 2018 2017 Warrants to purchase common stock 389,423 389,423 Stock option plan: Options outstanding 1,529,554 1,560,453 Restricted stock units outstanding 487,110 509,894 Shares available for future grants/RSU grants 1,415,994 580,827 Shares available for ESPP 432,699 275,587 Total 4,254,780 3,316,184 Common Stock Warrants. The following common stock warrants were outstanding as of March 31, 2018 and December 31, 2017: Total amount of securities issuable under the outstanding warrants Exercise Price Issuance Date Expiration Date $ 30.35 2012-2013 $ 2.38 2014-2015 2022-2024 $ 7.71 Common stock warrants are exercisable at the option of the holder any time after the date of issuance into shares of our common stock. During 2017, common stock warrants with an aggregate 7,378 shares of issuable common stock expired and common stock warrants with an aggregate 14,713 shares of issuable common stock were cashless exercised resulting in the issuance of 10,223 shares of common stock. Employee Benefit Plans. 2007 Equity Incentive Plan. In 2007, our Board of Directors and shareholders approved the 2007 Equity Incentive Plan (the “2007 Plan”) under which 272,727 shares of common stock were reserved and available for the issuance of stock options and restricted stock to eligible participants. The 2007 Plan was subsequently amended to increase the number of shares of common stock reserved for issuance under the 2007 Plan to 787,878 and during the year ended December 31, 2015, the number of shares reserved for issuance under the 2007 Plan was increased to 2,651,515. Options and restricted stock awards were granted at a price per share not less than the 85% of the fair value at the date of grant or award, respectively. Restricted stock awarded to persons controlling more than 10% of our stock were granted at a price per share not less than the 100% of the fair value at the date of the award. Options that were granted to new employees generally vest over a four-year period with 25% vesting at the end of one year and the remaining to vest monthly thereafter, while options that were granted to existing employees generally vest over a four-year period. Options granted generally are exercisable up to 10 years from the date of grant. As of October 26, 2015, no shares were available for grant under the 2007 Plan and all outstanding options would continue to be governed and remain outstanding in accordance with their existing terms. In addition, any shares subject to outstanding awards under the 2007 Plan that are issuable upon the exercise of options that expire or become unexercisable for any reason without having been exercised in full will be available for future grant and issuance under the 2015 Plan (as defined below). 2015 Equity Incentive Plan. In September 2015, our Board of Directors adopted, and in October 2015 our stockholders approved, our 2015 Equity Incentive Plan. The 2015 Equity Incentive Plan became effective on the date immediately prior to the date of our IPO. As a result, 1,813,272 shares of common stock previously reserved but unissued under the 2007 Plan on the effective date of the 2015 Equity Incentive Plan became reserved for issuance under our 2015 Equity Incentive Plan, and we ceased granting awards under our 2007 Plan. The number of shares reserved for issuance under our 2015 Equity Incentive Plan will increase automatically on the first day of January of each of 2016 through 2025 by the number of shares equal to 4% of the total outstanding shares of our common stock as of the immediately preceding December 31. However, our Board of Directors may reduce the amount of the increase in any particular year. Our 2015 Equity Incentive Plan authorizes the award of stock options, restricted stock awards, stock appreciation rights, restricted stock units (“RSUs”), performance awards and stock bonuses. No person will be eligible to receive more than 2,000,000 shares in any calendar year under our 2015 Equity Incentive Plan other than a new employee of ours, who will be eligible to receive no more than 4,000,000 shares under the plan in the calendar year in which the employee commences employment. The aggregate number of shares of our common stock that may be subject to awards granted to any one non-employee director pursuant to the 2015 Equity Incentive Plan in any calendar year shall not exceed 300,000. Our 2015 Equity Incentive Plan provides that no more than 25,000,000 shares will be issued as incentive stock options. 2015 Employee Stock Purchase Plan In September 2015, our Board of Directors adopted, and in October 2015 our stockholders approved, our 2015 Employee Stock Purchase Plan (“ESPP”). The 2015 Employee Stock Purchase Plan became effective on the date of our IPO. We reserved 150,000 shares of our common stock for issuance under our 2015 Employee Stock Purchase Plan. The number of shares reserved for issuance under our 2015 Employee Stock Purchase Plan will increase automatically on the first day of January following the first offering date by the number of shares equal to 1% of the total outstanding shares of our common stock as of the immediately preceding December 31 (rounded to the nearest whole share). However, our Board of Directors may reduce the amount of the increase in any particular year. The aggregate number of shares issued over the term of our 2015 Employee Stock Purchase Plan will not exceed 2,250,000 shares of our common stock. Under our 2015 Employee Stock Purchase Plan, eligible employees will be able to acquire shares of our common stock by accumulating funds through payroll deductions. Eligible employees will be able to select a rate of payroll deduction up to 15% of their base cash compensation. The purchase price for shares of our common stock purchased under our 2015 Employee Stock Purchase Plan will be 85% of the lesser of the fair market value of our common stock on (i) the first trading day of the applicable offering period and (ii) the last trading day of each purchase period in the applicable offering period. Except for the first offering period, each offering period will run for no more than six months, with purchases occurring every six months. The first offering period began upon the effective date of our IPO and was originally set to end on June 30, 2016. On May 25, 2016, the Board of Directors extended the initial offering period to July 31, 2016. Subsequent purchase periods will be 6 months in duration beginning on August 1, 2016. On July 29, 2016, we issued 68,392 shares of common stock in conjunction with the end date of the initial purchase window. During 2017, we issued 110,711 shares of common stock pursuant to the ESPP. On January 31, 2018 we issued 55,806 shares of common stock in conjunction with the end date of the latest purchase window. No participant will have the right to purchase shares of our common stock in an amount that has a fair market value greater than $25,000, determined as of the first day of the applicable purchase period, for each calendar year in which that right is outstanding. In addition, no participant will be permitted to purchase more than 2,500 shares during any one purchase period or a lesser amount as determined by our compensation committee. Our 2015 Employee Stock Purchase Plan will continue until the earlier to occur of its termination by our Board of Directors, the issuance of all shares reserved for issuance under it or the tenth anniversary of its effective date. A summary of stock option and RSUs (including performance-based RSU) activity under the 2007 Plan and the 2015 Equity Incentive Plan is as follows: Stock Options Weighted- Weighted- Average Average Remaining Aggregate Exercise Contractual Intrinsic Shares Price Term (Years) Value (aggregate intrinsic value in thousands) Outstanding as of December 31, 2015 796,356 2.49 6.5 $ 4,157 Granted 230,200 3.38 Exercised (13,112) 1.80 Canceled (21,549) 3.73 Outstanding as of December 31, 2016 991,895 2.68 6.3 $ 161 Granted 835,480 4.30 Exercised (230,123) 1.92 Canceled (36,799) 4.16 Outstanding as of December 31, 2017 1,560,453 3.63 7.6 $ 4,632 Granted 28,900 6.60 Exercised (47,405) 2.24 Canceled (12,394) 4.91 Outstanding as of March 31, 2018 1,529,554 $ 3.72 7.5 $ 5,786 Options vested and expected to vest as of March 31, 2018 1,472,615 $ 3.69 7.4 $ 5,617 Options vested and exercisable as of March 31, 2018 827,819 $ 3.10 6.3 $ 3,655 Restricted Stock Units Weighted- Weighted- Average Average Remaining Aggregate Grant Date Contractual Intrinsic Shares Fair Value Term (Years) Value (aggregate intrinsic value in thousands) Outstanding as of December 31, 2015 874,508 $ 5.95 1.8 $ 6,742 Granted 69,414 4.82 Released (438,086) 5.95 Forfeited/expired (14,882) 5.70 Outstanding as of December 31, 2016 490,954 5.80 0.5 $ 908 Granted 541,513 2.88 Released (497,009) 5.64 Forfeited/expired (25,564) 5.98 Outstanding as of December 31, 2017 509,894 2.84 1.4 $ 3,288 Granted — — Released (22,784) 4.08 Forfeited/expired — — Outstanding as of March 31, 2018 487,110 $ 2.78 1.3 $ 3,605

Stock-based Compensation

Stock-based Compensation	3 Months Ended
	Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-based Compensation	Note 10. Stock-based Compensation. We record stock-based compensation based on fair value as of the grant date using the Black-Scholes option-pricing model for stock options granted and Monte Carlo simulation techniques for certain RSUs with performance-based vesting conditions. We recognize such costs as compensation expense on a straight-line basis over the employee’s requisite service period, which is generally four years. Our valuation assumptions for stock options are as follows: Fair value of common stock. Prior to our IPO in October 2015, we estimated the fair value of our common stock using various valuation methodologies, including valuation analyses performed by third-party valuation firms. After the IPO, we used the publicly quoted price as the fair value of our common stock. Risk-free interest rate. We base the risk-free interest rate used in the Black-Scholes option-pricing model on the implied yield available on U.S. Treasury zero-coupon issues with an equivalent expected term of the options for each option group. Expected term. The expected term represents the period that our stock-based awards are expected to be outstanding. The expected term assumption is based on the simplified method in which the expected term is equal to the average of the stock-based award’s weighted-average vesting period and its contractual term. We expect to continue using the simplified method until sufficient information about historical behavior is available. Volatility. We determine volatility based on the historical stock volatilities of a group of publicly listed guideline companies over a period equal to the expected terms of the options, as we do not have sufficient trading history to determine the volatility of our common stock. Dividend yield. We have never declared or paid any cash dividend and do not currently plan to pay a cash dividend in the foreseeable future. Consequently, we used an expected dividend yield of zero. The following table summarizes the weighted-average assumptions used in the Black-Scholes option-pricing model to determine fair value of stock options: Three Months Ended March 31, 2018 2017 Volatility 71 % 86 % Expected dividend yield — — Risk-free rate 2.60 % 2.20 % Expected term (in years) 6 6 The weighted-average grant date fair value of the options granted under the 2015 Equity Incentive Plan as calculated using the Black-Scholes option-pricing model was $4.24 and $2.59 per share for the three months ended March 31, 2018 and 2017, respectively. On April 1, 2017, our compensation committee granted 204,220 RSUs that do not begin vesting unless certain performance goals are met. All performance goals must be met in order for the shares to begin vesting. Vesting would begin on the one-year anniversary of the grant date. These performance goals relate to a) the price performance of our common stock one year from the grant date as compared to a threshold established by our compensation committee and b) revenue, gross profit and EBITDA performance relative to plan targets for fiscal 2017 established by our compensation committee. As a result of these performance-based vesting conditions we valued these RSUs using Monte Carlo simulation techniques to establish a fair value per share of $0.81 at the time of grant. The following table presents the effects of stock-based compensation for stock options, RSUs (including performance-based RSUs), and ESPP purchase rights (in thousands): Three Months Ended March 31, 2018 2017 Cost of revenue $ 25 $ 21 Research and development 183 255 Sales and marketing 104 167 General and administrative 131 381 Total $ 443 $ 824 Stock-based compensation expense capitalized to inventories was not material during the three months ended March 31, 2018 and 2017. We did not realize any income tax benefit from stock option exercises in any of the periods presented due to recurring losses and valuation allowances. As of March 31, 2018 and 2017, the total unrecognized compensation cost related to stock options, net of estimated forfeitures, was approximately $1.9 million and $1.7 million, respectively, and this amount is expected to be recognized over a weighted-average period of approximately 2.8 years. As of March 31, 2018, the total unrecognized compensation cost related to RSUs (including performance-based RSUs) and ESPP purchase rights was $0.9 million and $85,000, respectively, and these amounts are expected to be recognized over 2.0 years and 0.3 years, respectively.

Income Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Note 11. Income Taxes. We recorded an income tax provision of $21,000 and $27,000 for the three months ended March 31, 2018 and 2017, respectively. The income tax provision is comprised of estimates of current taxes due in domestic and foreign jurisdictions. The income tax provision reflects tax expense associated with state income tax, foreign taxes, uncertain tax positions and tax expense related to the recording of a deferred tax liability that results from the amortization for income tax purposes of acquisition-related goodwill. The decrease in the tax provision between 2018 and 2017 is primarily due to a decrease in foreign taxes and deferred tax expense associated with our deferred tax liability. In December 2017, the Tax Cuts and Jobs Act (the “2017 Tax Act”) was enacted. The 2017 Tax Act includes a number of changes to existing U.S. tax laws that impact us, most notably a reduction of the U.S. corporate income tax rate from 35 percent to 21 percent for tax years beginning after December 31, 2017. On December 22, 2017, Staff Accounting Bulletin No. 118 ("SAB 118") was issued to address the application of U.S. GAAP in situations when a registrant does not have the necessary information available, prepared, or analyzed (including computations) in reasonable detail to complete the accounting for certain income tax effects of the 2017 Tax Act. In accordance with SAB 118, we have determined that the provisional amount related to the mandatory deemed repatriation of deferred foreign income was $0.2 million based on cumulative foreign earnings of $0.8 million. Additional work is necessary to do a more detailed analysis of historical foreign earnings as well as potential correlative adjustments. We are continuing to gather additional information to more precisely compute the amount of deferred foreign income to be included in U.S. taxable income. Any subsequent adjustment to these amounts will be recorded in the quarter of 2018 when the analysis is complete. In January 2018, the FASB released guidance on the accounting for tax on the global intangible low-taxed income ("GILTI") provisions of the 2017 Tax Act. The GILTI provisions impose a tax on foreign income in excess of a deemed return on tangible assets of foreign corporations. The guidance indicates that either accounting for deferred taxes related to GILTI inclusions or to treat any taxes on GILTI inclusions as period cost are both acceptable methods subject to an accounting policy election. Effective January 1, 2018, we elected to treat any potential GILTI inclusions as a period cost as we are not projecting any material impact from GILTI inclusions and any deferred taxes related to any inclusion would be immaterial. As of March 31, 2018, our deferred tax assets are fully offset by a valuation allowance except in those jurisdictions where it is determined that a valuation allowance is not required. Accounting for income taxes provides for the recognition of deferred tax assets if realization of such assets is more likely than not. Based on the weight of available evidence, which includes historical operating performance, reported cumulative net losses since inception and difficulty in accurately forecasting our future results, we provided a full valuation allowance against our net U.S. deferred tax assets. We reassess the need for our valuation allowance on a quarterly basis. If it is later determined that a portion or all of the valuation allowance is not required, it generally will be a benefit to the income tax provision in the period that such determination is made. We evaluate tax positions for recognition using a more-likely-than-not recognition threshold, and those tax positions eligible for recognition are measured as the largest amount of tax benefit that is greater than 50% likely of being realized upon the effective settlement with a taxing authority that has full knowledge of all relevant information. We believe that we have provided adequate reserves for our income tax uncertainties in all open tax years. We do not anticipate a material change in the total amount or composition of its unrecognized tax benefits within 12 months of March 31, 2018. We file federal, state and foreign income tax returns in jurisdictions with varying statutes of limitations. Due to our net operating loss and credit carryforwards, our income tax returns generally remain subject to examination by federal, state and international authorities.

Net Loss Per Share

Net Loss Per Share	3 Months Ended
	Mar. 31, 2018
Earnings Per Share [Abstract]
Net Loss Per Share	Note 12. Net Loss Per Share. The following outstanding common stock equivalents were excluded from the computation of diluted net loss per share for the periods presented because including them would have been antidilutive: Three Months Ended March 31, 2018 2017 Stock options 1,529,554 1,414,526 Restricted stock units 487,110 410,664 Common stock warrants 389,423 404,136 2,406,087 2,229,326

Related Party Transactions

Related Party Transactions	3 Months Ended
	Mar. 31, 2018
Related Party Transactions [Abstract]
Related Party Transactions	Note 13. Related Party Transactions. The Company purchases certain wafers from Altis Semiconductor S.N.C., which was acquired by X-FAB Silicon Foundries, a stockholder of the Company, in 2016. We made no payments to X-Fab Silicon Foundries during the three months ended March 31, 2018 and 2017. As of March 31, 2018 and December 31, 2017, invoices totaling zero and $195,000, respectively, were included within accounts payable on the consolidated balance sheets.

Subsequent Events

Subsequent Events	3 Months Ended
	Mar. 31, 2018
Subsequent Events [Abstract]
Subsequent Events	Note 14. Subsequent Events. On May 9, 2018 we acquired Dublin-based S3 Semiconductors, a global supplier of mixed-signal and radio frequency (“RF”) application specific integrated circuits (“ASICs”) and an extensive library of design intellectual property, for $35 million in cash and contingent consideration in the form of a $15 million earn-out. The earn-out is based on achievement of certain milestones through 2019, including minimum total revenue targets, revenue derived from sales of semiconductor devices and new customer engagements with minimum value thresholds. We financed the acquisition with cash and a new $35 million term loan under our new credit facility. In May 2018, we entered into and borrowed $35 million under the new credit facility described above that matures in May 2022. In connection with our entry into the new credit facility, we terminated our credit facility with Western Alliance Bank, which included paying off the outstanding term loan with a principal amount owed of $12 million. We also issued and sold to the lenders warrants to purchase an aggregate of 850,000 shares of Adesto common stock with an exercise price of $8.62 per share, subject to certain adjustments. .

Organization and Summary of S21

Organization and Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2018
Organization Consolidation and Presentation of Financial Statements [Abstract]
Organization and Nature of Operations	Organization and Nature of Operations. Adesto Technologies Corporation (together with its subsidiaries; “Adesto”, “we”, “our”, “us” or the “Company”) was incorporated in the state of California in January 2006 and reincorporated in Delaware in October 2015. We are a leading provider of application-specific and, ultra-low power non-volatile memory (“NVM”) products. Our corporate headquarters are located in Santa Clara, California. On September 28, 2012, we purchased certain flash memory product assets from Atmel Corporation and our financial results include the operating results of those assets from the date of acquisition.
Basis of Presentation	Basis of Presentation. The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) for interim financial information and with the instructions to Form 10‑Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by U.S. GAAP to complete annual consolidated financial statements. In the opinion of our management, all adjustments (consisting of normal recurring adjustments) considered necessary to present fairly the financial position of the Company and its results of operations and cash flows for the interim periods presented have been included. Operating results for the three months ended March 31, 2018 are not necessarily indicative of the results that may be expected for the year ending December 31, 2018, for any other interim period or for any other future year. The condensed consolidated balance sheet as of December 31, 2017 was derived from the audited consolidated financial statements as of that date, but does not include all of the disclosures required by U.S. GAAP. The accompanying condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto contained in the Company’s Annual Report on Form 10‑K for the year ended December 31, 2017, filed with the Securities and Exchange Commission on March 13, 2018. The condensed consolidated financial statements include the results of our operations, and the operations of our wholly owned subsidiaries. All intercompany balances and transactions have been eliminated. There have been no material changes to our significant accounting policies described in Note 1, Organization and Summary of Significant Accounting Policies, in Notes to Consolidated Financial Statements in Item 8 of Part II of our Annual Report on Form 10‑K for the year ended December 31, 2017 that have had a material impact on our condensed consolidated financial statements and related notes, except as described below.
Recent Accounting Pronouncements and Recently Adopted Accounting Pronouncements	Recent Accounting Pronouncements. In February 2018, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2018-02, Income Statement—Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income. This ASU allows a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the Tax Cuts and Jobs Act. This ASU is effective for fiscal years beginning after December 15, 2018 and interim periods within those fiscal years. The Company expects that the adoption will not have a material impact on its consolidated financial statements. In January 2017, the FASB issued ASU No. 2017-04, Intangibles—Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment. This ASU eliminates Step 2 from the goodwill impairment test. Instead, an entity should recognize an impairment charge for the amount by which the carrying value exceeds the reporting unit’s fair value, not to exceed the total amount of goodwill allocated to that reporting unit. This ASU is effective for annual or any interim goodwill impairment tests in fiscal years beginning after December 15, 2019. The Company is currently evaluating the effect of the adoption of this ASU, but anticipates that the adoption will not have a material impact on its consolidated financial statements. In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. This ASU requires instruments measured at amortized cost to be presented at the net amount expected to be collected. Entities are also required to record allowances for available-for-sale debt securities rather than reduce the carrying amount. This ASU is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. The Company expects that the adoption will not have a material impact on its consolidated financial statements. In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842). The core principle of Topic 842 is that a lessee should recognize the assets and liabilities that arise from leases. For operating leases, a lessee is required to recognize a right-of-use asset and a lease liability, initially measured at the present value of the lease payments, in the statement of financial position. This ASU is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. The Company is evaluating the effect that the adoption of this ASU will have on its financial statements. The Company currently expects that most of its operating lease commitments will be subject to the new standard and recognized as right-of-use assets and operating lease liabilities upon the adoption of ASU 2016-02, which will increase the total assets and total liabilities that it reports relative to such amounts prior to adoption. Recently Adopted Accounting Pronouncements. Adoption of ASC 606: In May 2014, the FASB issued an ASU on revenue from contracts with customers, ASU No. 2014-09, Revenue from Contracts with Customers (“Topic 606”). This standard update outlines a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers. The guidance is effective for annual reporting periods including interim reporting reports beginning after December 15, 2017. Collectively, we refer to Topic 606, its related amendments and Subtopic 340-40 as the “new standard”. On January 1, 2018, we adopted the new standard using the modified retrospective method applied to all contracts that are not completed contracts at the date of initial application (i.e., January 1, 2018). Results for reporting periods after January 1, 2018 are presented under the new standard, while prior period amounts are not adjusted and continue to be reported in accordance with our historic accounting. There was no impact on the opening accumulated deficit as of January 1, 2018 due to the adoption of the new standard. We reclassified the allowance for ship from stock and debits (“SSDs”), price protection, rights of return and other activities to current liabilities presented as "Price adjustments and other revenue reserves" from the allowance for accounts receivable due to the adoption of the new standard. We recorded s cumulative effect adjustment to our January 1, 2018 condensed consolidated balance sheet for the impact of the reclassification of the allowance for SSDs, price protection, rights of return and other activities to current liabilities presented as “Price adjustments and other revenue reserves”. The cumulative effect of the changes made to our January 1, 2018 condensed consolidated balance sheet for the adoption of the new revenue standard were as follows (in thousands): Balance at Adjustments Balance at December 31, Due to January 1, 2017 ASC 606 2018 Accounts receivable, net $ 8,668 $ 3,832 $ 12,500 Price adjustments and other revenue reserves $ — $ (3,832) $ (3,832) In accordance with the new standard requirements, the disclosure of the impact of adoption on select condensed consolidated balance sheet line items was as follows (in thousands): As of March 31, 2018 As Balances without Effect of Reported ASC 606 Change Accounts receivable, net $ 12,188 $ 7,643 $ (4,545) Price adjustments and other revenue reserves $ 4,545 $ — $ 4,545
Revenue Recognition	Revenue Recognition. Revenue is recognized when control of the promised goods or services is transferred to customers, in an amount that reflects the consideration we expect to be entitled to in exchange for those goods or services. Sales of products with alternative use account for the majority of our revenue and are recognized at a point in time, the timing of such recognition remained the same under Topic 606. Taxes assessed by a governmental authority that are both imposed on and concurrent with a specific revenue-producing transaction, that are collected by us from a customer and deposited with the relevant government authority, are excluded from revenue. Our revenue arrangements do not contain significant financing components. Revenue is recognized over a period of time when it is assessed that performance obligations are satisfied over a period rather than at a point in time. When any of the following criteria is fulfilled, revenue is recognized over a period of time: (a) The customer simultaneously receives and consumes the benefits provided by the performance as Adesto performs. (b) Adesto’s performance creates or enhances an asset (for example, work in process) that the customer controls as the asset is created or enhanced. (c) Adesto’s performance does not create an asset with an alternative use, and Adesto has an enforceable right to payment for performance completed to date. If revenue is recognized over a period of time, we would then select an appropriate method for measuring progress toward complete satisfaction of the performance obligation, usually costs incurred to date relative to the total expected costs to the satisfaction of that performance obligation. Typically, our revenue is recognized at a point in time. Sales to certain distributors are made under arrangements which provide the distributors with price adjustments, price protection, stock rotation and other allowances under certain circumstances. These adjustments and allowances are accounted for as variable consideration. We estimate these amounts based on the expected amount to be provided to customers and reduce revenue recognized. We believe that there will not be significant changes to our estimates of variable consideration. If a customer pays consideration, or Adesto has a right to an amount of consideration that is unconditional before we transfer a good or service to the customer, those amounts are classified as deferred income/ advances received from customers which are included in other current liabilities or other long-term liabilities when the payment is made or it is due, whichever is earlier. If the arrangement includes variable contingent consideration, we recognize revenue over time if we can reasonably measure its progress, or we are capable of providing reliable information that would be required to apply an appropriate method of measuring progress. To date, we have not had any arrangements incorporating contingent consideration. Practical Expedients and Elections Sales commissions are owed and are recorded at the time of sell through of our products to end customers. These costs are recorded within sales and marketing expenses. We do not disclose the value of unsatisfied performance obligations for (i) contracts with an original expected length of one year or less and (ii) contracts for which we recognize revenue at the amount to which we have the right to invoice for services performed. We have elected to account for shipping and handling costs as fulfillment costs after the customer obtains control of the goods. These costs are recorded in cost of revenue.
Reclassifications	Reclassifications. Certain reclassifications have been made to prior periods’ consolidated financial statements to conform to the current period presentation. These reclassifications did not result in any change in previously reported total assets, stockholders’ equity or net loss.
Use of Estimates	Use of Estimates. The preparation of consolidated financial statements in conformity with U.S. GAAP requires management to make estimates, judgments and assumptions that affect the reported amount of assets, liabilities, revenue and expenses and related disclosures of contingent assets and liabilities. On an on-going basis, we evaluate those estimates, including those related to allowances for doubtful accounts, reserves for sales, warranty accrual, inventory write-downs, valuation of long-lived assets, including property and equipment and identifiable intangible assets and goodwill, loss on purchase commitments, valuation of deferred taxes and contingencies. In addition, we use assumptions when employing the Black-Scholes option-pricing model to calculate the fair value of stock options granted and Monte Carlo simulation techniques to value certain restricted stock units with performance-based vesting conditions. We base our estimates of the carrying value of certain assets and liabilities on historical experience and on various other assumptions that are believed to be reasonable under the circumstances, when these carrying values are not readily available from other sources. Actual results could differ from these estimates.
Product Warranty	Product Warranty. Our products are sold with a limited warranty for a period of one year, warranting that the product conforms to specifications and is free from material defects in design, materials and workmanship. To date, we have had insignificant returns of any defective production parts. During the year ended December 31, 2015, we recorded $250,000 for a specific potential warranty claim. During the years ended December 31, 2017 and 2016, $185,000 and $41,000, respectively, has been incurred relating to this potential warranty claim and during the year ended December 31, 2017 we recorded $27,000 for an additional potential warranty claim. As of March 31, 2018 and December 31, 2017, the warranty accrual was $51,000 and is included in accrued expenses and other current liabilities on the condensed consolidated balance sheets.
Foreign Currency Translation	Foreign Currency Translation. The functional currency of our foreign subsidiaries is the local currency. In consolidation, we translate assets and liabilities at exchange rates in effect at the consolidated balance sheet date. We translate revenue and expense accounts at the average exchange rates during the period in which the transaction takes place. Net losses from foreign currency translation of assets and liabilities were $17,000 and $22,000 for the three months ended March 31, 2018 and 2017, respectively, and are included in the cumulative translation adjustment component of accumulated other comprehensive loss, net of tax, a component of stockholders’ equity. Net gains and losses arising from transactions denominated in currencies other than the functional currency were a loss of $8,000 and a gain of $13,000 for the three months ended March 31, 2018 and 2017, respectively, and are included in other expense, net in the condensed consolidated statements of operations.
Concentration of Risk	Concentration of Risk. Our products are primarily manufactured, assembled and tested by third-party foundries and other contractors in Asia and we are heavily dependent on a single foundry in Taiwan for the manufacture of wafers and a single contractor in the Philippines for assembly and testing of our products. We do not have long-term agreements with either of these suppliers. A significant disruption in the operations of these parties would adversely impact the production of our products for a substantial period of time, which could have a material adverse effect on our business, financial condition, operating results and cash flows. Financial instruments that potentially subject us to significant concentrations of credit risk consist principally of cash and cash equivalents and accounts receivables. We place substantially all of our cash and cash equivalents on deposit with a reputable, high credit quality financial institution in the United States of America. We believe that the bank that holds substantially all of our cash and cash equivalents is financially sound and, accordingly, subject to minimal credit risk. Deposits held with the bank may exceed the amount of insurance provided on such deposits. We generally do not require collateral or other security in support of accounts receivable. We periodically review the need for an allowance for doubtful accounts by considering factors such as historical experience, credit quality, the age of the accounts receivable balances and current economic conditions that may affect a customer’s ability to pay. As a result of our favorable collection experience and customer concentration, there was no allowance for doubtful accounts as of March 31, 2018 and December 31, 2017. Customer concentrations as a percentage of revenue, net were as follows: Three Months Ended March 31, 2018 2017 Customer A 18 % 18 % Customer B * 11 % Customer C * 11 % * Customer concentrations as a percentage of gross accounts receivable were as follows: March 31, December 31, 2018 2017 Customer A 26 % 31 % Customer B * * Customer C * * *

Organization and Summary of S22

Organization and Summary of Significant Accounting Policies (Tables)	3 Months Ended
	Mar. 31, 2018
Organization Consolidation and Presentation of Financial Statements [Abstract]
Schedule of Customer Concentration as Percentage of Total Revenue and Gross Receivable	Customer concentrations as a percentage of revenue, net were as follows: Three Months Ended March 31, 2018 2017 Customer A 18 % 18 % Customer B * 11 % Customer C * 11 % * Customer concentrations as a percentage of gross accounts receivable were as follows: March 31, December 31, 2018 2017 Customer A 26 % 31 % Customer B * * Customer C * * *

Balance Sheet Components (Table

Balance Sheet Components (Tables)	3 Months Ended
	Mar. 31, 2018
Balance Sheet Related Disclosures [Abstract]
Schedule of Accounts Receivable	March 31, December 31, 2018 2017 Accounts receivable $ 12,188 $ 12,500 Allowance for SSDs, price protection, rights of return and other activities — (3,832) Total accounts receivable, net $ 12,188 $ 8,668
Schedule of Inventories	Inventories consisted of the following (in thousands): March 31, December 31, 2018 2017 Raw materials $ 1,955 $ 2,213 Work-in-process 3,700 2,408 Finished goods 1,899 1,193 Total inventories $ 7,554 $ 5,814
Schedule of Property and Equipment net	Property and equipment, net consisted of the following (in thousands): March 31, December 31, 2018 2017 Machinery and equipment $ 9,850 $ 9,457 Leasehold improvements 4,252 4,252 Computer software 675 675 TowerJazz license 350 350 Furniture and fixtures 83 83 Construction in progress 1,301 1,301 Property and equipment, at cost 16,511 16,118 Accumulated depreciation and amortization (8,879) (8,935) Property and equipment, net $ 7,632 $ 7,183
Schedule of Accrued Expenses and Other Liabilities	Accrued expenses and other current liabilities consisted of the following (in thousands): March 31, December 31, 2018 2017 Accrued sales commission payable $ 273 $ 310 Accrued manufacturing expenses 310 265 Deferred rent, current portion 431 422 Liabilities to certain customers 732 468 Other accrued liabilities 760 894 Total accrued expenses and other current liabilities $ 2,506 $ 2,359

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2018
Fair Value Disclosures [Abstract]
Schedule of Fair Value, Liabilities Measured on Recurring Basis	Fair Value Measurement at Reporting Date Using Significant Quoted Prices in Other Significant Active Markets Observable Unobservable for Identical Inputs Inputs Assets (Level 1) (Level 2) (Level 3) Total (in thousands) As of March 31, 2018 Assets: Money market funds $ 11,511 $ — $ — $ 11,511 As of December 31, 2017 Assets: Money market funds $ 11,501 $ — $ — $ 11,501

Intangible Assets, net (Tables)

Intangible Assets, net (Tables)	3 Months Ended
	Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Intangible Assets	Intangible assets, net were as follows (in thousands): March 31, 2018 Estimated Useful Gross Carrying Accumulated Net Carrying Developed technology 10 $ 4,282 $ 2,355 $ 1,927 Customer relationships 12 9,011 4,130 4,881 Customer backlog 1 2,779 2,779 — Non-compete agreement 5 282 282 — Total intangible assets subject to amortization $ 16,354 $ 9,546 $ 6,808 December 31, 2017 Estimated Useful Gross Carrying Accumulated Net Carrying Developed technology 10 $ 4,282 $ 2,249 $ 2,033 Customer relationships 12 9,011 3,942 5,069 Customer backlog 1 2,779 2,779 — Non-compete agreement 5 282 282 — Total intangible assets subject to amortization $ 16,354 $ 9,252 $ 7,102
Schedule of Amortization Expense of Intangible Assets	We recorded amortization expense related to the acquisition-related intangible assets as follows (in thousands): Three Months Ended March 31, 2018 2017 Operating expense category: Research and development $ 106 $ 122 Sales and marketing 188 187 Total $ 294 $ 309
Schedule of Finite-Lived Intangible Assets, Annual Expected Amortization Expense	The estimated future amortization expense of acquisition-related intangible assets subject to amortization after March 31, 2018 is as follows (in thousands): Year Ended December 31, 2018 (remaining 9 months) $ 885 2019 1,179 2020 1,179 2021 1,179 2022 1,072 Thereafter 1,314 Total $ 6,808

Borrowings (Tables)

Borrowings (Tables)	3 Months Ended
	Mar. 31, 2018
Debt Disclosure [Abstract]
Schedule of Outstanding Borrowings	Outstanding borrowings consisted of the following (in thousands): March 31, December 31, 2018 2017 Term loan, current $ 1,929 $ 926 Term loan, non-current 9,924 10,908 Line of credit 1,500 1,500 Total $ 13,353 $ 13,334
Schedule of Future Repayments Of Outstanding Borrowing	Future repayments on outstanding borrowings (excluding unamortized discount of $147,000 as of March 31, 2018) are as follows (in thousands): Year Ended December 31, 2018 (remaining 9 months) $ 1,000 2019 5,500 2020 4,000 2021 3,000 $ 13,500

Segment Information (Tables)

Segment Information (Tables)	3 Months Ended
	Mar. 31, 2018
Segment Reporting [Abstract]
Schedule of Product Revenue from Customers Based on Geographic Region	Product revenue from customers is disaggregated based on the geographic region to which the product is delivered. Revenue by geographic region was as follows (in thousands): Three Months Ended March 31, 2018 2017 United States $ 2,702 $ 2,809 Rest of Americas 135 61 Europe 3,286 1,868 Asia Pacific 9,125 6,471 Rest of world 54 98 Total $ 15,302 $ 11,307
Schedule of Long-Lived Assets by Geographic Region	Long-lived assets are attributed to the geographic region were they are located. Long-lived assets by geographic region were as follows (in thousands): March 31, December 31, 2018 2017 United States $ 5,237 $ 5,424 Asia Pacific 2,395 1,759 Europe — — Total property and equipment, net $ 7,632 $ 7,183

Commitments and Contingencies (

Commitments and Contingencies (Tables)	3 Months Ended
	Mar. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Schedule of Future Minimum Lease Payments Under Operating Leases	3 Total 2018 2019 2020 2021 2022 Thereafter (in thousands) Operating leases $ 6,808 $ 929 $ 1,225 $ 1,249 $ 1,287 $ 1,325 $ 793

Common Stock, Common Stock Wa29

Common Stock, Common Stock Warrants and Stock Option Plan (Tables)	3 Months Ended
	Mar. 31, 2018
Equity [Abstract]
Schedule of Stock Reserved for Future Issuance	March 31, December 31, 2018 2017 Warrants to purchase common stock 389,423 389,423 Stock option plan: Options outstanding 1,529,554 1,560,453 Restricted stock units outstanding 487,110 509,894 Shares available for future grants/RSU grants 1,415,994 580,827 Shares available for ESPP 432,699 275,587 Total 4,254,780 3,316,184
Summary of Outstanding Common Stock Warrants	Total amount of securities issuable under the outstanding warrants Exercise Price Issuance Date Expiration Date $ 30.35 2012-2013 $ 2.38 2014-2015 2022-2024 $ 7.71
Summary of Stock Option Activity	Stock Options Weighted- Weighted- Average Average Remaining Aggregate Exercise Contractual Intrinsic Shares Price Term (Years) Value (aggregate intrinsic value in thousands) Outstanding as of December 31, 2015 796,356 2.49 6.5 $ 4,157 Granted 230,200 3.38 Exercised (13,112) 1.80 Canceled (21,549) 3.73 Outstanding as of December 31, 2016 991,895 2.68 6.3 $ 161 Granted 835,480 4.30 Exercised (230,123) 1.92 Canceled (36,799) 4.16 Outstanding as of December 31, 2017 1,560,453 3.63 7.6 $ 4,632 Granted 28,900 6.60 Exercised (47,405) 2.24 Canceled (12,394) 4.91 Outstanding as of March 31, 2018 1,529,554 $ 3.72 7.5 $ 5,786 Options vested and expected to vest as of March 31, 2018 1,472,615 $ 3.69 7.4 $ 5,617 Options vested and exercisable as of March 31, 2018 827,819 $ 3.10 6.3 $ 3,655
Summary of Restricted Stock Units Activity	Restricted Stock Units Weighted- Weighted- Average Average Remaining Aggregate Grant Date Contractual Intrinsic Shares Fair Value Term (Years) Value (aggregate intrinsic value in thousands) Outstanding as of December 31, 2015 874,508 $ 5.95 1.8 $ 6,742 Granted 69,414 4.82 Released (438,086) 5.95 Forfeited/expired (14,882) 5.70 Outstanding as of December 31, 2016 490,954 5.80 0.5 $ 908 Granted 541,513 2.88 Released (497,009) 5.64 Forfeited/expired (25,564) 5.98 Outstanding as of December 31, 2017 509,894 2.84 1.4 $ 3,288 Granted — — Released (22,784) 4.08 Forfeited/expired — — Outstanding as of March 31, 2018 487,110 $ 2.78 1.3 $ 3,605

Stock-based Compensation (Table

Stock-based Compensation (Tables)	3 Months Ended
	Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Summary of Weighted Average Assumptions Used to Value Options	Three Months Ended March 31, 2018 2017 Volatility 71 % 86 % Expected dividend yield — — Risk-free rate 2.60 % 2.20 % Expected term (in years) 6 6
Schedule of Employee Service Share-based Compensation for Stock Options, Restricted Stock Units and ESPP Shares	The following table presents the effects of stock-based compensation for stock options, RSUs (including performance-based RSUs), and ESPP purchase rights (in thousands): Three Months Ended March 31, 2018 2017 Cost of revenue $ 25 $ 21 Research and development 183 255 Sales and marketing 104 167 General and administrative 131 381 Total $ 443 $ 824

Net Loss Per Share (Tables)

Net Loss Per Share (Tables)	3 Months Ended
	Mar. 31, 2018
Earnings Per Share [Abstract]
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share	Three Months Ended March 31, 2018 2017 Stock options 1,529,554 1,414,526 Restricted stock units 487,110 410,664 Common stock warrants 389,423 404,136 2,406,087 2,229,326

Organization and Summary of S32

Organization and Summary of Significant Accounting Policies - Organization and Nature of Operations (Details)	Sep. 28, 2012
Certain Flash Memory Product Assets from Atmel Corporation [Member]
Business Acquisition [Line Items]
Date of Acquisition	Sep. 28, 2012

Organization and Summary of S33

Organization and Summary of Significant Accounting Policies - Revenue Recognition - Adoption of ASC 606 (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Accounts receivable, net	$ 12,188	$ 12,500	$ 8,668
Price adjustments and other revenue reserves	4,545	(3,832)
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Accounts receivable, net	7,643		$ 8,668
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Accounts receivable, net	(4,545)	3,832
Price adjustments and other revenue reserves	$ 4,545	$ (3,832)

Organization and Summary of S34

Organization and Summary of Significant Accounting Policies - Revenue Recognition - Practical Expedients (Details)	3 Months Ended
	Mar. 31, 2018
Revenue, Remaining Performance Obligation, Optional Exemption [Abstract]
Revenue, Remaining Performance Obligation, Optional Exemption, Performance Obligation	true

Organization and Summary of S35

Organization and Summary of Significant Accounting Policies - Product Warranty (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Product Warranties Disclosures [Abstract]
Product warranty	Our products are sold with a limited warranty for a period of one year, warranting that the product conforms to specifications and is free from material defects in design, materials and workmanship.
Product warranty period	1 year
Product warranty claim recorded		$ 27		$ 250
Product warranty claim incurred		185	$ 41
Product warranty accrual	$ 51	$ 51

Organization and Summary of S36

Organization and Summary of Significant Accounting Policies - Foreign Currency Translation (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Organization Consolidation and Presentation of Financial Statements [Abstract]
Foreign currency translation adjustment	$ 17	$ 22
Net losses arising from transactions denominated in currencies other than the functional currency	$ 8	$ 13

Organization and Summary of S37

Organization and Summary of Significant Accounting Policies - Concentrations Risk - Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Organization Consolidation and Presentation of Financial Statements [Abstract]
Allowance for doubtful accounts	$ 0	$ 0

Organization and Summary of S38

Organization and Summary of Significant Accounting Policies - Concentrations Risk - Tabular Disclosure (Details) - Customer Concentration Risk [Member]	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Sales Revenue, Net [Member] | Customer A [Member]
Concentration Risk [Line Items]
Concentration risk percentage (as a percent)	18.00%	18.00%
Sales Revenue, Net [Member] | Customer B [Member]
Concentration Risk [Line Items]
Concentration risk percentage (as a percent)		11.00%
Sales Revenue, Net [Member] | Customer C [Member]
Concentration Risk [Line Items]
Concentration risk percentage (as a percent)		11.00%
Accounts Receivable [Member] | Customer A [Member]
Concentration Risk [Line Items]
Concentration risk percentage (as a percent)	26.00%	31.00%

Balance Sheet Components - Acco

Balance Sheet Components - Accounts Receivable, Net - Tabular Disclosure (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
Accounts Receivable, Net, Current [Abstract]
Accounts receivable	$ 12,188		$ 12,500
Allowance for SSDs, price protection, rights of return and other activities			(3,832)
Total accounts receivable, net	$ 12,188	$ 12,500	$ 8,668

Balance Sheet Components - Ac40

Balance Sheet Components - Accounts Receivable, Net - Accumulated Impairment Losses (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Accounts Receivable, Net, Current [Abstract]
Allowance for doubtful accounts	$ 0	$ 0

Balance Sheet Components - Inve

Balance Sheet Components - Inventories - Tabular Disclosure (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Inventory, Net [Abstract]
Raw materials	$ 1,955	$ 2,213
Work-in-process	3,700	2,408
Finished goods	1,899	1,193
Total inventories	$ 7,554	$ 5,814

Balance Sheet Components - In42

Balance Sheet Components - Inventories - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Balance Sheet Related Disclosures [Abstract]
Realized benefit from sales of previously reserved products	$ 0.4	$ 0.4

Balance Sheet Components - Prop

Balance Sheet Components - Property and Equipment - Tabular Disclosure (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Property Plant And Equipment [Line Items]
Property and equipment, at cost	$ 16,511	$ 16,118
Accumulated depreciation and amortization	(8,879)	(8,935)
Property and equipment, net	7,632	7,183
Machinery and Equipment [Member]
Property Plant And Equipment [Line Items]
Property and equipment, at cost	9,850	9,457
Leasehold Improvements [Member]
Property Plant And Equipment [Line Items]
Property and equipment, at cost	4,252	4,252
Software and Software Development Costs [Member]
Property Plant And Equipment [Line Items]
Property and equipment, at cost	675	675
Licensing Agreements [Member]
Property Plant And Equipment [Line Items]
Property and equipment, at cost	350	350
Furniture and Fixtures [Member]
Property Plant And Equipment [Line Items]
Property and equipment, at cost	83	83
Construction in Progress [Member]
Property Plant And Equipment [Line Items]
Property and equipment, at cost	$ 1,301	$ 1,301

Balance Sheet Components - Pr44

Balance Sheet Components - Property and Equipment - Useful Lives (Details)	3 Months Ended
	Mar. 31, 2018
Tools, Dies and Molds [Member]
Property Plant And Equipment [Line Items]
Property and equipment, Estimated useful lives	3 years

Balance Sheet Components - Pr45

Balance Sheet Components - Property and Equipment - Depreciation and Amortization (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Balance Sheet Related Disclosures [Abstract]
Depreciation and amortization	$ 0.5	$ 0.3

Balance Sheet Components - Accr

Balance Sheet Components - Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Balance Sheet Related Disclosures [Abstract]
Accrued sales commission payable	$ 273	$ 310
Accrued manufacturing expenses	310	265
Deferred rent, current portion	431	422
Liabilities to certain customers	732	468
Other accrued liabilities	760	894
Total accrued expenses and other current liabilities	$ 2,506	$ 2,359

Fair Value Measurements - Finan

Fair Value Measurements - Financial Assets Measured at Fair Value (Details) - Fair Value, Measurements, Recurring [Member] - Money Market Funds [Member] - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds	$ 11,511	$ 11,501
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds	$ 11,511	$ 11,501

Fair Value Measurements - Fin48

Fair Value Measurements - Financial Liabilities Measured at Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial liabilities, fair value at recurring basis	$ 0	$ 0

Intangible Assets, net (Details

Intangible Assets, net (Details) $ in Millions	Sep. 28, 2012USD ($)
Certain Flash Memory Product Assets from Atmel Corporation [Member]
Finite Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired	$ 16.4

Intangible Assets, net - Estima

Intangible Assets, net - Estimated Useful Life (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Developed Technology Rights [Member]
Finite Lived Intangible Assets [Line Items]
Intangible assets, estimated useful life	10 years	10 years
Customer Relationships [Member]
Finite Lived Intangible Assets [Line Items]
Intangible assets, estimated useful life	12 years	12 years
Order or Production Backlog [Member]
Finite Lived Intangible Assets [Line Items]
Intangible assets, estimated useful life	1 year	1 year
Noncompete Agreements [Member]
Finite Lived Intangible Assets [Line Items]
Intangible assets, estimated useful life	5 years	5 years

Intangible Assets, net - Schedu

Intangible Assets, net - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Finite Lived Intangible Assets [Line Items]
Gross carrying amount	$ 16,354	$ 16,354
Accumulated amortization	9,546	9,252
Net carrying amount	6,808	7,102
Developed Technology Rights [Member]
Finite Lived Intangible Assets [Line Items]
Gross carrying amount	4,282	4,282
Accumulated amortization	2,355	2,249
Net carrying amount	1,927	2,033
Customer Relationships [Member]
Finite Lived Intangible Assets [Line Items]
Gross carrying amount	9,011	9,011
Accumulated amortization	4,130	3,942
Net carrying amount	4,881	5,069
Order or Production Backlog [Member]
Finite Lived Intangible Assets [Line Items]
Gross carrying amount	2,779	2,779
Accumulated amortization	2,779	2,779
Noncompete Agreements [Member]
Finite Lived Intangible Assets [Line Items]
Gross carrying amount	282	282
Accumulated amortization	$ 282	$ 282

Intangible Assets, net - Amorti

Intangible Assets, net - Amortization Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Finite Lived Intangible Assets [Line Items]
Amortization expense, acquisition related intangible assets	$ 294	$ 309
Research and Development [Member]
Finite Lived Intangible Assets [Line Items]
Amortization expense, acquisition related intangible assets	106	122
Sales and Marketing [Member]
Finite Lived Intangible Assets [Line Items]
Amortization expense, acquisition related intangible assets	$ 188	$ 187

Intangible Assets, net - Sche53

Intangible Assets, net - Schedule of Finite-Lived Intangible Assets, Annual Expected Amortization Expense (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2018 (remaining 9 months)	$ 885
2,019	1,179
2,020	1,179
2,021	1,179
2,022	1,072
Thereafter	1,314
Net carrying amount	$ 6,808	$ 7,102

Investment in Unconsolidated 54

Investment in Unconsolidated Affiliates (Details) - USD ($) $ in Millions	Jun. 15, 2017	Mar. 31, 2018	Dec. 31, 2017
Investment in Unconsolidated Affiliates
Notes receivable and accrued interest converted to shares	$ 0.4
Shares resulting from the conversion of notes receivable and accrued interest (in shares)	233,335
Other Noncurrent Assets [Member] | Semitech Semiconductor Pty Ltd [Member]
Investment in Unconsolidated Affiliates
Investments in notes receivable		$ 0.3	$ 0.3

Borrowings - Western Alliance B

Borrowings - Western Alliance Bank Term Loan (Details) $ in Thousands	Sep. 29, 2017USD ($)installment	Jul. 07, 2016USD ($)installment	Mar. 31, 2018USD ($)	Mar. 31, 2017USD ($)	Sep. 30, 2017
Debt Instrument [Line Items]
Amortization of debt discount			$ 19	$ 24
Unamortized debt discount			147
Western Alliance Bank Term Loan [Member]
Debt Instrument [Line Items]
Facility fee		$ 150
Debt instrument diligence fee		25
Debt Instrument additional fee liability	$ 125	$ 10
Debt instrument, interest rate spread above otherwise applicable interest rate (as a percent)		5.00%
Debt instrument, covenant, maximum quarterly revenue negative deviation from projection (as a percent)	25.00%
Amortization of debt discount			18
Unamortized debt discount			$ 100
Secured Debt [Member] | Western Alliance Bank Term Loan [Member]
Debt Instrument [Line Items]
Debt instrument, face amount		$ 18,000
Debt instrument, description of variable rate basis	The Term Loan bears interest at a rate per annum equal to the greater of the prime rate or 3.5%
Debt instrument, prime rate, minimum (as a percent)	3.50%
Debt instrument, interest rate (as a percent)			4.75%		5.00%
Borrowings mature date		Jun. 30, 2019
Debt instrument, description of payment terms	Under the Amendment, we will make interest-only payments on the Term Loan from October 10, 2017 and on the 10th calendar day of each month thereafter, and will make principal and interest payments in 36 equal installments beginning on October 10, 2018, and on the 10th calendar day of each month thereafter, until the maturity date of the Term Loan.	Prior to the Amendment, we made interest-only payments on the Term Loan from July 2016 through September 2016 and began making interest payments and principal payments in 33 equal monthly installments starting October 2016.
Number of monthly installments | installment	36	33
Unrestricted cash deposit to indebtedness ratio	1.25	1.50
Debt instrument, covenant, maximum cash held at a financial institution as percentage of term loan outstanding (as a percent)		100.00%
Revolving Credit Facility [Member] | Western Alliance Bank Term Loan [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 5,000	$ 2,000
Line of credit facility, maximum borrowing capacity as a percentage of eligible accounts receivable		80.00%
Debt instrument, description of variable rate basis	The Line of Credit bears interest at a rate per annum equal to the greater of the prime rate or 3.5%
Debt instrument, prime rate, minimum (as a percent)	3.50%
Debt instrument, basis spread on variable rate (as a percent)	0.25%
Debt instrument, interest rate (as a percent)			5.00%		4.75%
Borrowings mature date		Jul. 31, 2018
Prime Rate [Member] | Secured Debt [Member] | Western Alliance Bank Term Loan [Member]
Debt Instrument [Line Items]
Debt instrument, description of variable rate basis	the Term Loan bore interest at a rate per annum equal to the greater of the prime rate or 3.5%	Prior to the Amendment (as defined below), the Term Loan bore interest at a rate per annum equal to the greater of the prime rate or 3.5%
Debt instrument, prime rate, minimum (as a percent)		3.50%
Debt instrument, basis spread on variable rate (as a percent)		0.75%
Prime Rate [Member] | Revolving Credit Facility [Member] | Western Alliance Bank Term Loan [Member]
Debt Instrument [Line Items]
Debt instrument, description of variable rate basis	Line of Credit bore interest at a rate per annum equal to the greater of the prime rate or 3.5%	Prior to the Amendment, the Line of Credit bore interest at a rate per annum equal to the greater of the prime rate or 3.5%
Debt instrument, prime rate, minimum (as a percent)		3.50%
Debt instrument, basis spread on variable rate (as a percent)		0.50%

Borrowings - Outstanding Borrow

Borrowings - Outstanding Borrowings (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Long-term Debt, Unclassified [Abstract]
Term loan, current	$ 1,929	$ 926
Term loan, non-current	9,924	10,908
Line of credit	1,500	1,500
Total	$ 13,353	$ 13,334

Borrowings - Unamortized Discou

Borrowings - Unamortized Discount (Details) $ in Thousands	Mar. 31, 2018USD ($)
Debt Instrument, Unamortized Discount [Abstract]
Unamortized debt discount	$ 147

Borrowings - Future Repayments

Borrowings - Future Repayments on Outstanding Borrowings (Details) $ in Thousands	Mar. 31, 2018USD ($)
Long-term Debt, Fiscal Year Maturity [Abstract]
2018 (remaining 9 months)	$ 1,000
2,019	5,500
2,020	4,000
2,021	3,000
Borrowing outstanding prior to accounting for debt discount	$ 13,500

Borrowings - Interest Expense (

Borrowings - Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Interest Expense, Debt [Abstract]
Interest expense (excluding unamortized discount)	$ 154	$ 223

Borrowings - New Credit Facilit

Borrowings - New Credit Facility (Details) $ in Millions	May 09, 2018USD ($)
Subsequent Event [Member] | Secured Debt [Member] | Credit Facility Maturing May 2022 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	$ 35

Segment Information - General I

Segment Information - General Information (Details)	3 Months Ended
	Mar. 31, 2018segment
Segment Reporting [Abstract]
Number of business segments	1

Segment Information - Revenue b

Segment Information - Revenue by Geographic Region (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue, net	$ 15,302	$ 11,307
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue, net	2,702	2,809
Rest of Americas [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue, net	135	61
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue, net	3,286	1,868
Asia Pacific [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue, net	9,125	6,471
Rest of World [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue, net	$ 54	$ 98

Segment Information - Long-Live

Segment Information - Long-Lived Assets by Geographic Region (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	$ 7,632	$ 7,183
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	5,237	5,424
Asia Pacific [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	$ 2,395	$ 1,759

Commitments and Contingencies -

Commitments and Contingencies - Operating Leases (Details) - Headquarters Facility in Santa Clara [Member] $ in Thousands	Nov. 02, 2015USD ($)ft²	Mar. 31, 2018USD ($)	Mar. 31, 2017USD ($)
Operating Leased Assets [Line Items]
Base monthly rent during the extension period	$ 93
Area leased (in sqft) | ft²	34,000
Lease Expiration Date	Jul. 31, 2023
Optional Lease Extension Term	5 years
Annual increase of monthly rent after February 27, 2017	3.00%
Reimbursement for out-of-pocket costs associated with any tenant improvements	$ 2,500
Lease incentive obligation, noncurrent		$ 1,900	$ 2,300

Commitments and Contingencies65

Commitments and Contingencies - Rent Expense (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Rent expense under operating leases	$ 0.2	$ 0.2

Commitments and Contingencies66

Commitments and Contingencies - Future Minimum Lease Payments Under Operating Leases (Details) $ in Thousands	Mar. 31, 2018USD ($)
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Total	$ 6,808
2,018	929
2,019	1,225
2,020	1,249
2,021	1,287
2,022	1,325
Thereafter	$ 793

Commitments and Contingencies67

Commitments and Contingencies - Purchase Commitments (Details) $ in Millions	3 Months Ended
	Mar. 31, 2018USD ($)
Purchase Commitments with Third-party Foundries [Member]
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Purchase commitments	$ 4.4
Purchase commitment, period	1 year
Licensing and Development Agreement [Member]
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Purchase commitments	$ 0.4
Agreement with TowerJazz Panasonic Semiconductor Company [Member]
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Purchase commitments	$ 0.4

Common Stock, Common Stock Wa68

Common Stock, Common Stock Warrants and Stock Option Plan - Common Stock (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2018Vote$ / sharesshares	Dec. 31, 2017Vote$ / sharesshares
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Common stock, shares authorized (in shares) | shares	100,000,000	100,000,000
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Voting right common stock holder	Each holder of common stock is entitled to one vote per share.	Each holder of common stock is entitled to one vote per share.
Common stock, votes per share (in votes) | Vote	1	1
Common stock, dividends declared	$ 0	$ 0

Common Stock, Common Stock Wa69

Common Stock, Common Stock Warrants and Stock Option Plan - Public Offering (Details) $ / shares in Units, $ in Millions	1 Months Ended
	Jun. 30, 2017USD ($)$ / sharesshares
Follow-on Offering [Member]
Subsidiary, Sale of Stock [Line Items]
Stock issued (in shares)	5,000,000
Share price (in dollars per share) | $ / shares	$ 4
Proceeds from public offering, net of underwriting discounts and commissions | $	$ 18.4
Over-Allotment Option [Member]
Subsidiary, Sale of Stock [Line Items]
Stock issued (in shares)	625,000

Common Stock, Common Stock Wa70

Common Stock, Common Stock Warrants and Stock Option Plan - Stock Reserved for Future Issuance (Details) - shares	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2015
Class of Stock [Line Items]
Common stock, capital shares reserved for future issuance (in shares)	4,254,780	3,316,184
Common Stock Warrants [Member]
Class of Stock [Line Items]
Warrants to purchase common stock (in shares)	389,423	389,423
Stock Options [Member]
Class of Stock [Line Items]
Common stock, capital shares reserved for future issuance (in shares)	1,529,554	1,560,453
Restricted Stock Units (RSUs) [Member]
Class of Stock [Line Items]
Common stock, capital shares reserved for future issuance (in shares)	487,110	509,894
Shares available for future grants (in shares)	1,415,994	580,827
Employee Stock [Member]
Class of Stock [Line Items]
Common stock, capital shares reserved for future issuance (in shares)	432,699	275,587	150,000

Common Stock, Common Stock Wa71

Common Stock, Common Stock Warrants and Stock Option Plan - Common Stock Warrants - Tabular Disclosure (Details) - $ / shares	Mar. 31, 2018	Dec. 31, 2017
Common Stock Warrants [Member]
Class of Warrant or Right [Line Items]
Warrants to purchase common stock (in shares)	389,423	389,423
Exercise Price (in dollars per share)	$ 7.71	$ 7.71
Common Stock Warrants One [Member]
Class of Warrant or Right [Line Items]
Warrants to purchase common stock (in shares)	74,141	74,141
Exercise Price (in dollars per share)	$ 30.35	$ 30.35
Common Stock Warrants Two [Member]
Class of Warrant or Right [Line Items]
Warrants to purchase common stock (in shares)	315,282	315,282
Exercise Price (in dollars per share)	$ 2.38	$ 2.38

Common Stock, Common Stock Wa72

Common Stock, Common Stock Warrants and Stock Option Plan - Common Stock Warrants - Additional Information (Details) - Common Stock Warrants [Member]	12 Months Ended
	Dec. 31, 2017shares
Class Of Warrant Or Right [Line Items]
Warrants expired (in shares)	7,378
Warrants exercised (in shares)	14,713
Shares issued upon exercising warrants (in shares)	10,223

Common Stock, Common Stock Wa73

Common Stock, Common Stock Warrants and Stock Option Plan - 2007 Equity Incentive Plan (Details) - shares	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Oct. 26, 2016	Dec. 31, 2015	Dec. 31, 2007	Jan. 31, 2007
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock, capital shares reserved for future issuance (in shares)	4,254,780	3,316,184
Stock Options [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock, capital shares reserved for future issuance (in shares)	1,529,554	1,560,453
2007 Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock, capital shares reserved for future issuance (in shares)				2,651,515	787,878	272,727
Percentage of fair market value of common stock (as a percent)	85.00%
Vesting period	4 years
Number of shares available for grant (in shares)			0
2007 Plan [Member] | New Employee [Member] | Share-based Compensation Award, Tranche One [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting percentage in year one (as a percent)	25.00%
2007 Plan [Member] | Stock Options [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Exercisable period	10 years
2007 Plan [Member] | Restricted Stock [Member] | Persons controlling more than 10% of Company's stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of fair market value of common stock (as a percent)	100.00%

Common Stock, Common Stock Wa74

Common Stock, Common Stock Warrants and Stock Option Plan - 2015 Equity Incentive Plan (Details) - shares	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Oct. 26, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock, capital shares reserved for future issuance (in shares)	4,254,780	3,316,184
2015 Equity Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock, capital shares reserved for future issuance (in shares)			1,813,272
Stock option grants description	The number of shares reserved for issuance under our 2015 Equity Incentive Plan will increase automatically on the first day of January of each of 2016 through 2025 by the number of shares equal to 4% of the total outstanding shares of our common stock as of the immediately preceding December 31.
Percentage threshold of outstanding shares increased annually under the plan (as a percent)	4.00%
Incentive stock options, maximum shares that may be issued (in shares)	25,000,000
Existing Employee [Member] | 2015 Equity Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock shares authorized for issuance (in shares)	2,000,000
New Employee [Member] | 2015 Equity Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock shares authorized for issuance (in shares)	4,000,000
Non Employee Director [Member] | 2015 Equity Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock shares authorized for issuance (in shares)	300,000

Common Stock, Common Stock Wa75

Common Stock, Common Stock Warrants and Stock Option Plan - 2015 Employee Stock Purchase Plan (Details) - USD ($)	Jan. 31, 2018	Jul. 29, 2016	Sep. 30, 2015	Mar. 31, 2018	Dec. 31, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock, capital shares reserved for future issuance (in shares)				4,254,780	3,316,184
Employee Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock, capital shares reserved for future issuance (in shares)			150,000	432,699	275,587
Employee stock purchase plan description				The number of shares reserved for issuance under our 2015 Employee Stock Purchase Plan will increase automatically on the first day of January following the first offering date by the number of shares equal to 1% of the total outstanding shares of our common stock as of the immediately preceding December 31 (rounded to the nearest whole share).
Percentage threshold of outstanding shares increased annually under the plan (as a percent)			1.00%
Common stock shares authorized for issuance (in shares)			2,250,000
Payroll deduction (as a percent)				15.00%
Percentage of fair market value of common stock (as a percent)				85.00%
Shares issued (in shares)	55,806	68,392			110,711
Maximum fair market value, that would permit employee to purchase common stock under plan				$ 25,000
Maximum number of shares issued each participants (in shares)				2,500

Common Stock, Common Stock Wa76

Common Stock, Common Stock Warrants and Stock Option Plan - Stock Option Activity (Details) - Stock Options [Member] - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Shares
Outstanding, beginning of period (in shares)	1,560,453	991,895	796,356
Granted (in shares)	28,900	835,480	230,200
Exercised (in shares)	(47,405)	(230,123)	(13,112)
Cancelled (in shares)	(12,394)	(36,799)	(21,549)
Outstanding, end of period (in shares)	1,529,554	1,560,453	991,895	796,356
Weighted Average Exercise Price
Outstanding, beginning of period (in dollars per share)	$ 3.63	$ 2.68	$ 2.49
Granted (in dollars per share)	6.60	4.30	3.38
Exercised (in dollars per share)	2.24	1.92	1.80
Cancelled (in dollars per share)	4.91	4.16	3.73
Outstanding, end of period (in dollars per share)	$ 3.72	$ 3.63	$ 2.68	$ 2.49
Additional information
Weighted Average Remaining Contractual Term (Years)	7 years 6 months	7 years 7 months 6 days	6 years 3 months 18 days	6 years 6 months
Aggregate Intrinsic Value	$ 5,786	$ 4,632	$ 161	$ 4,157
Options vested and exercisable, end of period (in shares)	827,819
Options vested and exercisable, end of period (in dollars per share)	$ 3.10
Options vested and exercisable	6 years 3 months 18 days
Options vested and exercisable as of March 31, 2018	$ 3,655
Vested and expected to vest
Options vested and expected to vest, end of period (in shares)	1,472,615
Options vested and expected to vest, end of period (in dollars per share)	$ 3.69
Options vested and expected to vest	7 years 4 months 24 days
Options vested and expected to vest as of March 31, 2018	$ 5,617

Common Stock, Common Stock Wa77

Common Stock, Common Stock Warrants and Stock Option Plan - Restricted Stock Units - Activity (Details) - Restricted Stock Units (RSUs) [Member] - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Shares
Outstanding, beginning of period (in shares)	509,894	490,954	874,508
Granted (in shares)		541,513	69,414
Released (in shares)	(22,784)	(497,009)	(438,086)
Forfeited/expired (in shares)		(25,564)	(14,882)
Outstanding, end of period (in shares)	487,110	509,894	490,954	874,508
Weighted Average Grant Date Fair Value
Outstanding, beginning of period (in dollars per share)	$ 2.84	$ 5.80	$ 5.95
Granted (in dollars per share)		2.88	4.82
Released (in dollars per share)	4.08	5.64	5.95
Forfeited/expired (in dollars per share)		5.98	5.70
Outstanding, end of period (in dollars per share)	$ 2.78	$ 2.84	$ 5.80	$ 5.95
Weighted Average Remaining Contractual Term (Years)
Weighted Average Remaining Contractual Term (Years)	1 year 3 months 18 days	1 year 4 months 24 days	6 months	1 year 9 months 18 days
Aggregate Intrinsic Value
Outstanding, end of period	$ 3,605	$ 3,288	$ 908	$ 6,742

Stock-based Compensation - Gene

Stock-based Compensation - General Information (Details) - Stock Options [Member]	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Employee's requisite service period	4 years
Expected dividend yield (as a percent)	0.00%	0.00%

Stock-based Compensation - Weig

Stock-based Compensation - Weighted Average Assumptions Used to Value Options (Details) - Stock Options [Member]	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Volatility (as a percent)	71.00%	86.00%
Expected dividend yield (as a percent)	0.00%	0.00%
Risk-free rate (as a percent)	2.60%	2.20%
Expected term (in years)	6 years	6 years

Stock-based Compensation - We80

Stock-based Compensation - Weighted Average Grant Date Fair Value of Options Granted (Details) - $ / shares	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Weighted-average grant date fair value of the options granted (in dollars per share)	$ 4.24	$ 2.59

Stock-based Compensation - Perf

Stock-based Compensation - Performance-based RSUs (Details) - Performance-based Restricted Stock Units [Member]	Apr. 01, 2017$ / sharesshares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Granted (in shares) | shares	204,220
Vesting period	1 year
Fair value per share at the time of grant (in dollars per share) | $ / shares	$ 0.81

Stock-based Compensation - Shar

Stock-based Compensation - Share-based Compensation (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	$ 443	$ 824
Cost of Revenue [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	25	21
Research and Development [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	183	255
Sales and Marketing [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	104	167
General and Administrative [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	$ 131	$ 381

Stock-based Compensation - Unre

Stock-based Compensation - Unrecognized Compensation Cost (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Stock Options [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized compensation cost	$ 1,900	$ 1,700
Expected to be recognized over a weighted-average period	2 years 9 months 18 days
Restricted Stock Units (RSUs) [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized compensation cost	$ 900
Expected to be recognized over a weighted-average period	2 years
Employee Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized compensation cost	$ 85
Expected to be recognized over a weighted-average period	3 months 18 days

Income Taxes - Provision (Detai

Income Taxes - Provision (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Tax Disclosure [Abstract]
Provision for income taxes	$ 21	$ 27

Income Taxes - Tax Cuts and Job

Income Taxes - Tax Cuts and Jobs Act (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Federal tax at statutory rate (as a percent)	21.00%	35.00%
Provisional amount related to the mandatory deemed repatriation of deferred foreign income		$ 0.2
Cumulative foreign earnings		$ 0.8

Net Loss Per Share (Details)

Net Loss Per Share (Details) - shares	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	2,406,087	2,229,326
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	1,529,554	1,414,526
Restricted Stock Units (RSUs) [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	487,110	410,664
Common Stock Warrants [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	389,423	404,136

Related Party Transactions (Det

Related Party Transactions (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Related Party Transactions [Abstract]
Payments to related party	$ 0	$ 0
Accounts payable to related party	$ 0		$ 195

Subsequent Events - Acquisition

Subsequent Events - Acquisition (Details) - Subsequent Event [Member] - S3 Semiconductors [Member] $ in Millions	May 09, 2018USD ($)
Subsequent Event [Line Items]
Cash consideration	$ 35
Contingent consideration, earn-out	$ 15

Subsequent Events - New Credit

Subsequent Events - New Credit Facility (Details) $ in Millions	May 09, 2018USD ($)
Subsequent Event [Member] | Secured Debt [Member] | Credit Facility Maturing May 2022 [Member]
Subsequent Event [Line Items]
Debt instrument, face amount	$ 35

Subsequent Events - Western All

Subsequent Events - Western Alliance Bank Term Loan (Details) $ in Millions	May 09, 2018USD ($)
Secured Debt [Member] | Western Alliance Bank Term Loan [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Payoff amount, principal	$ 12

Subsequent Events - Warrants (D

Subsequent Events - Warrants (Details) - $ / shares	May 09, 2018	Mar. 31, 2018	Dec. 31, 2017
Common Stock Warrants [Member]
Subsequent Event [Line Items]
Warrants to purchase common stock (in shares)		389,423	389,423
Exercise price (in dollars per share)		$ 7.71	$ 7.71
Subsequent Event [Member] | Common Stock Warrants, Lender Warrants [Member]
Subsequent Event [Line Items]
Warrants to purchase common stock (in shares)	850,000
Exercise price (in dollars per share)	$ 8.62