INPHI 10-K 2 Mar 20 2019 FY Annual report Financial data

Document And Entity Information

Document And Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2019	Feb. 26, 2020	Jun. 30, 2019
Document Information [Line Items]
Entity Central Index Key	0001160958
Entity Registrant Name	INPHI CORP
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2019
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2019
Document Transition Report	false
Entity File Number	001-34942
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	77-0557980
Entity Address, Address Line One	2953 Bunker Hill Lane, Suite 300
Entity Address, City or Town	Santa Clara
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	95054
City Area Code	408
Local Phone Number	217-7300
Title of 12(b) Security	Common Stock, $0.001 par value
Trading Symbol	IPHI
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float			$ 2,200,000,000
Entity Common Stock, Shares Outstanding		46,077,975

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 282,723	$ 172,018
Investments in marketable securities	140,131	235,339
Accounts receivable, net	60,295	61,271
Inventories	55,013	33,052
Prepaid expenses and other current assets	17,463	9,600
Total current assets	555,625	511,280
Property and equipment, net	79,563	70,740
Goodwill	104,502	104,502
Intangible assets, net	168,290	180,447
Right of use assets, net	33,576	0
Other assets, net	34,450	22,904
Total assets	976,006	889,873
Current liabilities:
Accounts payable	18,771	15,891
Deferred revenue	3,719	5,432
Accrued employee expenses	13,164	11,206
Other accrued expenses	5,125	7,595
Less current portion of long-term debt	217,467	0
Other current liabilities	33,531	24,319
Total current liabilities	291,777	64,443
Convertible debt	258,711	447,825
Other long-term liabilities	78,917	10,911
Total liabilities	629,405	523,179
Commitments and contingencies (Note 16)
Stockholders’ equity:
Preferred stock, $0.001 par value; 10,000,000 shares authorized; no shares issued	0	0
Common stock, $0.001 par value; 500,000,000 shares authorized; 45,909,466 and 44,292,722 issued and outstanding at December 31, 2019 and 2018, respectively	46	44
Additional paid-in capital	587,862	536,157
Accumulated deficit	(242,807)	(169,896)
Accumulated other comprehensive income	1,500	389
Total stockholders’ equity	346,601	366,694
Total liabilities and stockholders’ equity	$ 976,006	$ 889,873

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parentheticals) - $ / shares	Dec. 31, 2019	Dec. 31, 2018
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, authorized (in shares)	10,000,000	10,000,000
Preferred stock, issued (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, authorized (in shares)	500,000,000	500,000,000
Common stock, issued (in shares)	45,909,466	44,292,722
Common stock, outstanding (in shares)	45,909,466	44,292,722

Consolidated Statements of Inco

Consolidated Statements of Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenue	$ 365,635	$ 294,490	$ 348,201
Cost of revenue	152,814	129,345	151,698
Gross profit	212,821	165,145	196,503
Operating expenses:
Research and development	183,875	167,924	200,539
Sales and marketing	47,722	43,080	42,381
General and administrative	30,672	28,302	23,782
Total operating expenses	262,269	239,306	266,702
Loss from operations	(49,448)	(74,161)	(70,199)
Interest expense	(34,920)	(32,209)	(29,842)
Other income, net	11,853	2,408	3,961
Loss before income taxes	(72,515)	(103,962)	(96,080)
Provision (benefit) for income taxes	396	(8,211)	(21,176)
Net loss	$ (72,911)	$ (95,751)	$ (74,904)
Earnings per share:
Basic (in dollars per share)	$ (1.61)	$ (2.19)	$ (1.78)
Diluted (in dollars per share)	$ (1.61)	$ (2.19)	$ (1.78)
Weighted-average shares used in computing earnings per share:
Basic (in shares)	45,226,717	43,690,581	42,165,213
Diluted (in shares)	45,226,717	43,690,581	42,165,213

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Net loss	$ (72,911)	$ (95,751)	$ (74,904)
Other comprehensive income (loss):
Change in unrealized gain or loss, net of $0, $0, and $0 tax expense in 2019, 2018 and 2017, respectively	1,173	(179)	(9)
Realized gain reclassified into earnings, net of tax	(62)	(1)	(1)
Comprehensive loss	$ (71,800)	$ (95,931)	$ (74,914)

Consolidated Statements of Co_2

Consolidated Statements of Comprehensive Income (Loss) (Parentheticals) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Change in unrealized gain, tax	$ 0	$ 0	$ 0

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Total
Balance (in shares) at Dec. 31, 2016	41,303,363
Balance at Dec. 31, 2016	$ 41	$ 459,928	$ 1,976	$ 579	$ 462,524
Issuance of common stock from exercise of stock options (in shares)	300,982
Issuance of common stock from exercise of stock options	$ 1	2,174	0	0	2,175
Issuance of common stock from restricted stock unit grants, net of shares withheld for tax (in shares)	1,004,785
Issuance of common stock from restricted stock unit grants, net of shares withheld for tax	$ 1		0	0
Issuance of common stock from restricted stock unit grants, net of shares withheld for tax		(27,776)			$ (27,775)
Issuance of common stock from employee stock purchase plan (in shares)	171,099				171,099
Issuance of common stock from employee stock purchase plan	$ 0	5,776	0	0	$ 5,776
Stock-based compensation expense	0	44,832	0	0	44,832
Cumulative effect of change in accounting principle	0	0	(1,217)	0	(1,217)
Net loss	0	0	(74,904)	0	(74,904)
Other comprehensive loss, net	$ 0	0	0	(10)	(10)
Balance (in shares) at Dec. 31, 2017	42,780,229
Balance at Dec. 31, 2017	$ 43	484,934	(74,145)	569	411,401
Issuance of common stock from exercise of stock options (in shares)	187,742
Issuance of common stock from exercise of stock options	$ 0	719	0	0	719
Issuance of common stock from restricted stock unit grants, net of shares withheld for tax (in shares)	1,041,258
Issuance of common stock from restricted stock unit grants, net of shares withheld for tax	$ 1		0	0
Issuance of common stock from restricted stock unit grants, net of shares withheld for tax		(19,286)			$ (19,285)
Issuance of common stock from employee stock purchase plan (in shares)	283,493				283,493
Issuance of common stock from employee stock purchase plan	$ 0	5,906	0	0	$ 5,906
Stock-based compensation expense	0	63,884	0	0	63,884
Net loss	0	0	(95,751)	0	(95,751)
Other comprehensive loss, net	$ 0	0	0	(180)	(180)
Balance (in shares) at Dec. 31, 2018	44,292,722
Balance at Dec. 31, 2018	$ 44	536,157	(169,896)	389	$ 366,694
Issuance of common stock from exercise of stock options (in shares)	253,980				253,980
Issuance of common stock from exercise of stock options	$ 0	2,616	0	0	$ 2,616
Issuance of common stock from restricted stock unit grants, net of shares withheld for tax (in shares)	1,154,043
Issuance of common stock from restricted stock unit grants, net of shares withheld for tax	$ 2		0	0
Issuance of common stock from restricted stock unit grants, net of shares withheld for tax		(34,140)			$ (34,138)
Issuance of common stock from employee stock purchase plan (in shares)	208,721				208,721
Issuance of common stock from employee stock purchase plan	$ 0	6,374	0	0	$ 6,374
Stock-based compensation expense	0	76,855	0	0	76,855
Net loss	0	0	(72,911)	0	(72,911)
Other comprehensive loss, net	$ 0	0	0	1,111	1,111
Balance (in shares) at Dec. 31, 2019	45,909,466
Balance at Dec. 31, 2019	$ 46	$ 587,862	$ (242,807)	$ 1,500	$ 346,601

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash flows from operating activities
Net loss	$ (72,911)	$ (95,751)	$ (74,904)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	96,694	82,719	77,855
Stock-based compensation	76,855	63,884	44,833
Gain from sale of an equity investment	(924)	0	0
Loss (gain) on disposal of property and equipment	444	331	(174)
Net unrealized gain on equity investments	(2,201)	(2,441)	0
Impairment of non-marketable equity investment	0	7,000	0
Impairment of intangible assets	0	0	47,014
Deferred income taxes	337	(8,628)	(22,428)
Accretion of convertible debt and amortization of issuance expenses	28,353	26,394	24,574
Amortization of premiums (discount) on marketable securities	(1,118)	(583)	1,040
Other noncash items	(46)	2	(10)
Changes in assets and liabilities:
Accounts receivable	(1,524)	6,722	(17,392)
Inventories	(21,961)	(1,331)	318
Prepaid expenses and other assets	(2,707)	549	2,272
Income tax payable/receivable	279	(1,671)	(638)
Accounts payable	482	1,963	1,655
Accrued expenses	(805)	(4,902)	(554)
Deferred revenue	(1,713)	4,997	(3,195)
Other liabilities	(590)	(1,095)	(2,958)
Net cash provided by operating activities	96,944	78,159	77,308
Cash flows from investing activities
Purchases of property and equipment	(29,518)	(31,713)	(37,437)
Proceeds from disposal of property and equipment	0	145	100
Purchases of marketable securities	(274,246)	(248,038)	(261,247)
Sales of marketable securities	168,426	11,654	85,163
Maturities of marketable securities	203,068	242,825	182,299
Proceeds from sale of equity investments	3,424	2,414	0
Proceeds from sale of discontinued operations	0	0	10,690
Acquisition of business, net of cash acquired	0	0	(1,800)
Purchases of intangible assets	(1,137)	(126)	(2,421)
Purchases of equity investment in private companies	(7,000)	(12,811)	0
Net cash provided by (used in) investing activities	63,017	(35,650)	(24,653)
Cash flows from financing activities
Proceeds from exercise of stock options	2,616	719	2,214
Proceeds from employee stock purchase plan	6,374	5,906	5,776
Minimum tax withholding paid on behalf of employees for net share settlement	(33,596)	(19,118)	(27,673)
Payments of obligations related to purchase of intangible assets	(24,221)	(21,311)	(13,688)
Repayment of long-term loan	0	405	333
Payments of obligations related to equipment financing	(429)	(542)	(1,034)
Net cash used in financing activities	(49,256)	(33,941)	(34,072)
Net increase in cash and cash equivalents	110,705	8,568	18,583
Cash and cash equivalents at beginning of year	172,018	163,450	144,867
Cash and cash equivalents at end of year	282,723	172,018	163,450
Supplemental cash flow information
Income taxes paid (refund received)	(155)	2,155	2,158
Interest paid	6,577	5,818	5,194
Supplemental disclosure of non-cash investing and financing activities
Software license intangible assets	57,406	20,066	2,888
Equity investment acquired as settlement of receivable from a customer	$ 2,500	$ 0	$ 0

Note 1 - Organization and Summa

Note 1 - Organization and Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2019
Notes to Financial Statements
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]	1. Inphi Corporation (the “Company”), a Delaware corporation, was incorporated in November 2000. The Company is subject to certain risks and uncertainties and believes changes in any of the following areas could have a material adverse effect on the Company’s future financial position or results of operations or cash flows: ability to sustain profitable operations due to losses incurred and accumulated deficit, dependence on a limited number of customers for a substantial portion of revenue, product defects, risks related to intellectual property matters, lengthy sales cycle and competitive selection process, lengthy and expensive qualification process, ability to develop new or enhanced products in a timely manner, market development of and demand for the Company’s products, reliance on third Basis of Presentation The accompanying consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States of America (“GAAP”) and include the accounts of the Company and subsidiaries. All intercompany balances and transactions have been eliminated in consolidation. Revisions In connection with the preparation of the Company’s 2019 not no not 2018 2017 December 31, 2018 December 31, 2017 See also note 18 2019 2018 Use of Estimates The preparation of consolidated financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reporting period. Actual results could differ from those estimates. On an ongoing basis, management evaluates its estimates, including those related to (i) the collectibility of accounts receivable and allowance for distributors’ price discounts; (ii) write-down for excess and obsolete inventories; (iii) warranty obligations; (iv) the value assigned to and estimated useful lives of long-lived assets; (v) the realization of tax assets and estimates of tax liabilities and tax reserves; (vi) the measurement of non-marketable equity securities; (vii) amounts recorded in connection with acquisitions; (viii) recoverability of intangible assets and goodwill; and (ix) the recognition and disclosure of fair value of convertible debt and contingent liabilities. These estimates are based on historical data and experience, as well as various other factors that management believes to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying value of assets and liabilities that are not third may Foreign Currency Translation The Company and its subsidiaries use the U.S. dollar as its functional currency. Foreign currency assets and liabilities are remeasured into U.S. dollars at the end-of-period exchange rates except for non-monetary assets and liabilities, which are remeasured at historical exchange rates. Revenue and expenses are remeasured at the exchange rate in effect during the period the transaction occurred, except for those expenses related to balance sheet amounts, which are remeasured at historical exchange rates. Gains or losses from foreign currency transactions are included in the consolidated statements of income (loss) as part of “other income, net.” Foreign currency gain (loss) in 2019, 2018 2017 Cash and Cash Equivalents The Company considers all highly liquid investments with an original or remaining maturity of three one may Fair Market Value of Financial Instruments The carrying amount reflected in the balance sheet for cash and cash equivalents, accounts receivable, prepaid and other current assets, accounts payable and other current liabilities, approximate fair value due to the short-term nature of these financial instruments. Investments Investments in marketable securities consist of available-for-sale securities. These investments are recorded at fair value with changes in fair value, net of applicable taxes, recorded as unrealized gains (losses) as a component of accumulated other comprehensive income in stockholders' equity. Realized gains and losses are included in Other income, net. The cost basis for realized gains and losses on available-for-sale securities is determined on a specific identification basis. The Company periodically evaluates whether declines in fair values of its investments below their book values are other-than-temporary. When the fair value is lower than the amortized cost, the Company considers whether: ( 1 2 not 3 not not not not On January 1, 2018, 2016 01, Inventories Inventories are stated at the lower of cost and net realizable value. Cost is computed using standard cost, which approximates actual cost, on a first first not Property and Equipment Property and equipment are stated at cost less accumulated depreciation and amortization. Depreciation and amortization is provided on property and equipment over the estimated useful lives on a straight-line basis. Leasehold improvements are amortized on a straight-line basis over the shorter of their estimated useful lives or the related lease term. Repairs and maintenance are charged to expense as incurred. Useful lives by asset category are as follows: Asset Category Years Office equipment 3 Software 3 Leasehold improvements Shorter of lease term or estimated useful life Production equipment 2 - 5 Computer equipment 5 Lab equipment 5 Furniture and fixtures 7 Intangible Assets Intangible assets represent rights acquired for developed technology, customer relationships, trademarks, patents and in-process research and development (“IPR&D”) in connection with business acquisitions. Intangible assets with finite useful lives are amortized over periods ranging from one ten Impairment of Long-lived Assets and Goodwill Long-lived Assets The Company assesses the impairment of long-lived assets, which consist primarily of property and equipment and intangible assets, whenever events or changes in circumstances indicate that such assets might be impaired and the carrying value may not may If events or changes in circumstances indicate that the carrying amount of an asset may not Goodwill Goodwill is recorded when consideration paid for a business acquisition exceeds the fair value of net tangible and intangible assets acquired. Goodwill is measured and tested for impairment on an annual basis during the fourth To review for impairment, the Company first not not not no not 2019, 2018 2017. Internal Use Software Costs Certain external computer software costs acquired for internal use are capitalized. Training costs and maintenance are expensed as incurred, while upgrades and enhancements are capitalized if it is probable that such expenditures will result in additional functionality. Capitalized costs are included within property and equipment. If a cloud computing arrangement includes a software license, then the Company accounts for the software license element of the arrangement consistent with the acquisition of other software licenses. If a cloud computing arrangement does not Revenue Recognition Prior to January 1, 2018, On January 1, 2018, 2014 09, 606 not January 1, 2018. no January 1, 2018. January 1, 2018, December 31, 2018 December 31, 2018, January 1, 2018 not The following table shows revenue by geography, based on the receiving location of customers: Year Ended December 31, 2019 2018 2017 (in thousands) China $ 164,715 $ 113,684 $ 114,168 United States 103,402 87,545 92,620 Thailand 54,468 40,884 45,205 Other 43,050 52,377 96,208 $ 365,635 $ 294,490 $ 348,201 The Company recognizes revenue when control of the promised goods or services is transferred to customers in an amount that reflects the consideration the Company expects to receive in exchange for such goods or services. Product Revenue The Company’s products are fully functional at the time of shipment and do not may not December 31, 2019 2018, 30 60 one two Other Revenue Occasionally, the Company enters into license and development agreements with some of its customers and recognizes revenue from these agreements upon completion and acceptance by the customer of contract deliverables or as services are provided, depending on the terms of the arrangement. Revenue is deferred for any amounts billed or received prior to transfer of control. The Company believes the milestone method best depicts the efforts expended to transfer services to the customers under most of the Company’s development agreements. Certain contracts may not The Company does not one 2020 2021 December 31, 2019 Revenue from non-product sales was approximately 7%, 3% and 3% of total revenue for the years ended December 31, 2019, 2018, 2017 The Company monitors the collectability of accounts receivable primarily through review of the accounts receivable aging. The Company’s policy is to record an allowance for doubtful accounts based on specific collection issues identified, aging of underlying receivables and historical experience of uncollectible balances. Cost of Revenue Cost of revenue includes cost of materials, such as wafers processed by third Warranty The Company’s products are under warranty against defects in material and workmanship generally for a period of one two may December 31, 2019 2018 Research and Development Expense Research and development expense consists of costs incurred in performing research and development activities including salaries, stock-based compensation, employee benefits, occupancy costs, pre-production engineering mask costs, impairment of in-process research and development, overhead costs and prototype wafer, packaging and test costs. Research and development costs are expensed as incurred. The Company enters into development agreements with some of the Company’s customers. Recoveries from nonrecurring engineering services from early stage technology are recorded as an offset to product development expense incurred in support of this effort and serve as a mechanism to partially recover development expenditures. These reimbursements are recognized upon completion and acceptance by the customer of contract deliverables or milestones. The Company recorded approximately $0, $0 and $3,000 as offset to research and development expense for the years ended December 31, 2019, 2018 2017 Sales and Marketing Expense Sales and marketing expense consists of salaries, stock-based compensation, employee benefits, travel, trade show costs, amortization of intangibles and others. The Company expenses sales and marketing costs as incurred. Advertising expenses for the years ended December 31, 2019, 2018 2017 not General and Administrative Expense General and administrative expense consists of salaries, stock-based compensation, employee benefits and expenses for executive management, legal, finance and others. In addition, general and administrative expense includes fees for professional services and occupancy costs. These costs are expensed as incurred. Income Taxes Deferred tax assets and liabilities are determined based on differences between financial reporting and tax bases of assets and liabilities, and are measured using the enacted tax rates and laws that will be in effect when the differences are expected to reverse. The Company recognizes the deferred income tax effects of a change in tax rates in the period of enactment. The Company must also make judgments in evaluating whether deferred tax assets will be recovered from future taxable income. To the extent that it believes that recovery is not not not not” may may The Company regularly performs a comprehensive review of uncertain tax positions. An uncertain tax position represents an expected treatment of a tax position taken in a filed tax return, or planned to be taken in a future tax return or claim, which has not not On December 22, 2017, January 1, 2018, one 100% first 21%. 118 118” one 118, December 31, 2017, 21%, 2018, 2017 no December 31, 2018, Stock-Based Compensation Stock-based compensation for stock option and restricted stock units issued to the Company’s employees is measured at the grant date based on the fair value of the award and is recognized as expense over the requisite service period, which is the vesting period, on a straight-line basis or graded vesting basis for awards with performance or market-based conditions. The fair value of restricted stock units is based on the fair market value of the Company’s common stock on the date of grant. If the award has a market condition, the Company estimates the fair value using Monte Carlo simulation model and recognizes compensation ratably over the service period. The Company has elected to treat share-based payment awards with graded vesting schedules and time-based service conditions as single awards and recognizes stock-based compensation expense on a straight-line basis (net of estimated forfeitures) over the requisite service period. The Company recognizes non-employee stock-based compensation expense based on the estimated fair value of the equity instrument determined using the Black-Scholes option pricing model or fair value of the Company's common stock. Management believes that the fair value of the underlying stock award is more reliably measured than the fair value of the services received. The fair value of each non-employee variable stock award is re-measured each period until a commitment date is reached, which is generally the vesting date. Starting January 1, 2019, no Earnings per Share Basic earnings per share is calculated by dividing income allocable to common stockholders by the weighted average number of shares of common stock outstanding during the period. Diluted earnings per share is calculated by dividing the net income allocable to common stockholders by the weighted average number of common shares outstanding, adjusted for the effects of potentially dilutive common stock, which are comprised of stock options, restricted stock units, employee share purchase plan and the shares that could be issued upon conversion of the Company’s convertible debt. The capped call options in connection with the issuance of the convertible notes are excluded from the calculation of diluted earnings per share as their impact is always anti-dilutive. Segment Information The Company operates in one Recent Accounting Pronouncements In February 2016, 12 twelve not January 1, 2019. 7 In June 2016, December 15, 2019. not In January 2017, 2 2 December 15, 2019, January 1, 2019. not In February 2018, December 15, 2018. January 1, 2019. not In June 2018, December 15, 2018. January 1, 2019. not In August 2018, no 1 2 3 December 15, 2019. not In August 2018, 350 40 December 15, 2019. not In November 2018, not December 15, 2019. not In December 2019, 740, December 15, 2020,

Note 2 - Investments

Note 2 - Investments	12 Months Ended
	Dec. 31, 2019
Notes to Financial Statements
Investment [Text Block]	2 . Investments The following table summarizes the investments by investment category: December 31, 2019 Cost Gross Unrealized Gain Gross Unrealized Loss Fair Value Available-for-sale securities: U.S. Treasury securities $ 3,752 $ 7 $ — $ 3,759 Municipal bonds 6,062 57 — 6,119 Corporate notes/bonds 118,859 591 (1 ) 119,449 Asset-backed securities 4,239 29 — 4,268 Commercial paper 6,464 1 (1 ) 6,464 Certificate of deposit 72 — — 72 Total investments $ 139,448 $ 685 $ (2 ) $ 140,131 December 31, 2018 Cost Gross Unrealized Gain Gross Unrealized Loss Fair Value Available-for-sale securities: Municipal bonds $ 6,751 $ 1 $ (19 ) $ 6,733 Corporate notes/bonds 146,466 14 (354 ) 146,126 Variable rate demand notes 8,900 — — 8,900 Asset-backed securities 32,986 — (63 ) 32,923 Commercial paper 39,707 — (6 ) 39,701 Certificate of deposit 956 — — 956 Total investments $ 235,766 $ 15 $ (442 ) $ 235,339 As of December 31, 2019 three December 31, 2019 The realized gain related to the Company’s available-for-sale investment, which was reclassified from accumulated other comprehensive income, was included in other income, net in the consolidated statements of income (loss). Contractual maturities of available-for-sale securities at December 31, 2019 Cost Fair Value Due in one year or less $ 88,803 $ 89,049 Due between one and five years 50,645 51,082 $ 139,448 $ 140,131 The Company has a marketable equity investment in a company located in Taiwan. The fair value of the investment and unrealized loss as of December 31, 2019 December 31, 2018 December 31, 2019, The Company has non-marketable equity investments in privately held companies without readily determinable market values. Prior to January 1, 2018, January 1, 2018, 2016 01, December 31, 2019 December 31, 2019 December 31, 2018, December 31, 2018. December 31, 2019 2018, December 31, 2018, not

Note 3 - Concentrations

Note 3 - Concentrations	12 Months Ended
	Dec. 31, 2019
Notes to Financial Statements
Concentration Risk Disclosure [Text Block]	3 . Concentrations Financial instruments that subject the Company to concentrations of credit risk consist primarily of cash, cash equivalents, investments in marketable securities and trade accounts receivable. The Company extends differing levels of credit to customers and does not December 31, 2019 2018 December 31, 2019 2018 $1,634, The following table summarizes the significant customers’ (including distributors) accounts receivable and revenue as a percentage of total accounts receivable and total revenue, respectively: December 31, Accounts Receivable 2019 2018 Customer A 15 % 13 % Customer B 13 13 Customer C * * Customer D 19 * Customer E * * Year Ended December 31, Revenue 2019 2018 2017 Customer A 14 % 18 % 12 % Customer B * * 12 Customer C 11 * * Customer D * * * Customer E * 11 * * Less than 10% Customer A is a subcontractor of a direct customer that would be a “Customer F” December 31, 2019, 2018 2017, December 31, 2019, 2018 2017 December 31, 2018 2017, 10% December 31, 2019.

Note 4 - Inventories

Note 4 - Inventories	12 Months Ended
	Dec. 31, 2019
Notes to Financial Statements
Inventory Disclosure [Text Block]	4 . Inventories Inventories consist of the following: December 31, 2019 2018 Raw materials $ 18,593 $ 12,435 Work in process 19,081 13,602 Finished goods 17,339 7,015 $ 55,013 $ 33,052

Note 5 - Property and Equipment

Note 5 - Property and Equipment, Net	12 Months Ended
	Dec. 31, 2019
Notes to Financial Statements
Property, Plant and Equipment Disclosure [Text Block]	5 . Property and Equipment, net Property and equipment consist of the following: December 31, 2019 2018 Laboratory and production equipment $ 144,866 $ 121,716 Office, software and computer equipment 37,241 30,190 Furniture and fixtures 1,617 1,558 Leasehold improvements 8,282 7,609 192,006 161,073 Less accumulated depreciation (112,443 ) (90,333 ) $ 79,563 $ 70,740 Depreciation and amortization expense for the years ended December 31, 2019, 2018 2017 As of December 31, 2019 2018 December 31, 2019, 2018 2017 Property and equipment not December 31, 2019 2018

Note 6 - Intangible Assets

Note 6 - Intangible Assets	12 Months Ended
	Dec. 31, 2019
Notes to Financial Statements
Goodwill and Intangible Assets Disclosure [Text Block]	6 . Intangible Assets The following table presents details of intangible assets: December 31, 2019 December 31, 2018 Gross Accumulated Amortization Net Gross Accumulated Amortization Net Developed technology $ 186,800 $ 123,365 $ 63,435 $ 186,800 $ 86,378 $ 100,422 Customer relationships 70,540 31,409 39,131 70,540 21,681 48,859 Trade name 2,310 1,766 544 2,310 1,350 960 Patents 1,579 1,010 569 1,579 881 698 Software 74,022 9,411 64,611 61,406 31,898 29,508 $ 335,251 $ 166,961 $ 168,290 $ 322,635 $ 142,188 $ 180,447 During the year ended December 31, 2018, During the year ended December 31, 2017, December 31, 2017. The following table presents amortization of intangible assets for the years ended December 31, 2019, 2018 2017 Year Ended December 31, 2019 2018 2017 Cost of revenue $ 36,987 $ 32,845 $ 28,502 Research and development 22,305 19,311 18,352 Sales and marketing 9,728 9,727 9,727 General and administrative 545 609 643 $ 69,565 $ 62,492 $ 57,224 Based on the amount of intangible assets subject to amortization at December 31, 2019 five 2020 $ 56,558 2021 52,469 2022 42,656 2023 15,769 2024 672 Thereafter 166 $ 168,290 The weighted-average amortization periods remaining by intangible asset category were as follows (in years): Developed technology 3.0 Customer relationship 4.0 Trade name 2.0 Patents 7.6 Software 2.7

Note 7 - Leases

Note 7 - Leases	12 Months Ended
	Dec. 31, 2019
Notes to Financial Statements
Lessee, Operating Leases [Text Block]	7. On January 1, 2019, 2016 02, 842 not January 1, 2019. twelve not January 1, 2019, not The Company determines if an arrangement is a lease at inception. Operating leases are included in operating lease ROU assets, other current liabilities and other long-term liabilities on the consolidated balance sheets. Finance leases are included in property and equipment, other current liabilities, and other long-term liabilities on the consolidated balance sheets. As of the adoption date and December 31, 2019, not Operating lease ROU assets and operating lease liabilities are recognized based on the present value of the future minimum lease payments over the lease term at commencement date. As most of the leases do not may The Company has operating leases for office facilities. The leases have remaining lease terms of one ten may five Information related to operating leases for the year ended December 31, 2019 Operating lease expense $ 5,094 Cash paid for leases $ 4,585 Right of use assets obtained in exchange for lease obligations $ 27,639 Weighted average remaining lease term and weighted average discount as of December 31, 2019 Weighted average remaining lease term (years) 8.52 Weighted average discount rate 3.9 % Future minimum lease payments under non-cancellable leases as of December 31, 2019 2020 $ 4,455 2021 6,174 2022 6,351 2023 6,266 2024 6,073 Thereafter 23,630 Total future minimum lease payments 52,949 Less: Imputed interest 8,006 Lease incentive recognized as offset to asset liability 1,324 Present value of lease obligations $ 43,619 As of December 31, 2019, not second 2020 three five As previously reported in the Company’s Annual Report on Form 10 December 31, 2018 840 December 31, 2018 2019 $ 4,588 2020 2,252 2021 1,883 2022 1,722 2023 1,615 2024 and thereafter 1,698 Total $ 13,758 For the years ended December 31, 2018 2017,

Note 8 - Convertible Debt

Note 8 - Convertible Debt	12 Months Ended
	Dec. 31, 2019
Convertible Debt [Member]
Notes to Financial Statements
Debt Disclosure [Text Block]	8 . Convertible Debt The carrying value of the Company's long-term debt consists of the following: December 31, December 31, 2019 2018 Principal $ 517,500 $ 517,500 Less: Unamortized debt discount (38,105 ) (64,222 ) Unamortized debt issuance costs (3,217 ) (5,453 ) Net carrying amount of long-term debt 476,178 447,825 Less current portion of long-term debt 217,467 — Long-term debt, non-current portion $ 258,711 $ 447,825 In December 2015, 2020 2015 2015 December 1, 2020, 2015 June 1 December 1 June 1, 2016. $1 2015, 2015 not Prior to the close of business on the business day immediately preceding June 1, 2020, may 2015 March 31, 2016 ( not $1 2015, June 1, 2020, second may may 2015 The Convertible Notes 2015 not The Convertible Notes 2015 2015 2015 not 2015 2015 2015 may, 2015 2015 2015 2015 2015. December 31, 2019 none 2015 In accounting for the issuance of the Convertible Notes 2015, 2015 not 2015 2015 December 31, 2015 2016, Interest expense for the Convertible Note 2015 Year Ended December 31, 2019 2018 2017 Contractual interest expense $ 2,586 $ 2,587 $ 2,588 Amortization of debt discount 11,645 10,833 10,079 Amortization of debt issuance costs 1,050 976 907 Total interest expense $ 15,281 $ 14,396 $ 13,574 In connection with the issuance of the Convertible Notes 2015, 2015, 2015 815 40, The purchased Capped Call allows the Company to receive shares of its common stock and/or cash from counterparties equal to the amounts of common stock and/or cash related to the excess of the market price per share of the common stock, as measured under the terms of the Capped Call over the strike price of the Capped Call during the relevant valuation period. The purchased Capped Call is intended to reduce the potential dilution to common stock upon future conversion of the Convertible Notes 2015 2015 The Capped Call is a separate transaction entered into by the Company with the option counterparties, is not 2015 not 2015. In September 2016, 2021 2016 2015, 2016 September 1, 2021, 2016 March 1 September 1 March 1, 2017. $1 2016, 2016 not Prior to the close of business on the business day immediately preceding March 1, 2021, may 2016 December 31, 2016 ( not $1 2016, March 1, 2021, second may may 2016 The Convertible Notes 2016 not The Convertible Notes 2016 2016 2016 not 2016 2016 2016 2016, may, 2016 2016 2016 2016 2016. December 31, 2019 none 2016 In accounting for the issuance of the Convertible Notes 2016, 2016 not 2016 2016 Interest expense for the Convertible Notes 2016 Year Ended December 31, 2019 2018 2017 Contractual interest expense $ 2,152 $ 2,156 $ 2,154 Amortization of debt discount 14,472 13,481 12,559 Amortization of debt issuance costs 1,186 1,104 1,029 Total interest expense $ 17,810 $ 16,741 $ 15,742 In connection with the issuance of the Convertible Notes 2016, 2016 2016, 2016, 2016 815 40, The purchased Capped Call 2016 2016 2016 2016 2016 2016 The Capped Call 2016 not 2016 not 2016.

Note 9 - Other Liabilities

Note 9 - Other Liabilities	12 Months Ended
	Dec. 31, 2019
Notes to Financial Statements
Other Liabilities Disclosure [Text Block]	9 . Other Liabilities Other current liabilities consist of the following: December 31, 2019 2018 Software license intangible asset liability $ 25,810 $ 21,945 Operating lease liability 2,545 — Others 5,176 2,374 $ 33,531 $ 24,319 Other long-term liabilities consist of the following: December 31, 2019 2018 Deferred rent $ 26 $ 1,100 Income tax payable 692 706 Software license intangible asset liability 36,144 7,961 Operating lease liability 41,074 — Others 981 1,144 $ 78,917 $ 10,911

Note 10 - Income Taxes

Note 10 - Income Taxes	12 Months Ended
	Dec. 31, 2019
Notes to Financial Statements
Income Tax Disclosure [Text Block]	1 0 . Income Taxes Loss before income taxes consists of the following: Year Ended December 31, 2019 2018 2017 United States $ (60,313 ) $ (71,978 ) $ (77,649 ) Foreign (12,202 ) (31,984 ) (18,431 ) Total $ (72,515 ) $ (103,962 ) $ (96,080 ) Income tax provision (benefit) consisted of the following: Year Ended December 31, 2019 2018 2017 Current: U.S. Federal $ — $ — $ 96 U.S. State (11 ) 42 51 Foreign 70 375 1,105 59 417 1,252 Deferred: U.S. Federal — (6,734 ) (11,312 ) U.S. State — — (613 ) Foreign 337 (1,894 ) (10,503 ) 337 (8,628 ) (22,428 ) Total $ 396 $ (8,211 ) $ (21,176 ) Provision (benefit) for income taxes differed from the amounts computed by applying the U.S. federal income tax rate of 21% in 2019, 2018 2017 Year Ended December 31, 2019 2018 2017 Benefit at statutory rate $ (15,228 ) $ (21,832 ) $ (32,562 ) State income taxes (587 ) 594 (585 ) Research and development credits (16,933 ) (13,283 ) (12,983 ) Change in valuation allowance 31,917 13,757 40,028 Impact of foreign operations (1,045 ) 5,925 (1,951 ) Unrecognized tax benefits 6,725 5,340 3,596 Stock-based compensation (4,731 ) (381 ) (10,248 ) Prior year return to provision adjustment (1,167 ) 1,422 1,105 Section 162(m) 1,046 — — Effect of U. S. tax law change — — (4,602 ) Impairment of intangibles — — (2,328 ) Other 399 247 (646 ) $ 396 $ (8,211 ) $ (21,176 ) Significant components of the Company’s net deferred taxes consist of the following: December 31, 2019 2018 Deferred tax assets Net operating loss carry forwards $ 48,481 $ 39,888 Research and development credits 84,268 69,320 Stock-based compensation 8,884 9,055 Accrued expenses and allowances 1,897 2,334 Amortization and depreciation — 1,408 Operating lease liability 7,345 — Other temporary differences 6,884 6,411 Foreign tax credit 2,338 2,338 Valuation allowance (123,989 ) (92,315 ) Total deferred tax assets 36,108 38,439 Deferred tax liabilities Acquired intangible assets (16,092 ) (22,593 ) Convertible debt (6,444 ) (11,596 ) Amortization and depreciation (2,123 ) — Right of use asset (6,806 ) — Other deferred tax liabilities (1,482 ) (603 ) Total deferred tax liabilities (32,947 ) (34,792 ) Deferred tax assets, net $ 3,161 $ 3,647 On December 22, 2017, 21% January 1, 2018, one 100% first 2017, 118. 2017, one During 2018, 2017 no The Tax Reform Act subjects a U.S. shareholder to tax on GILTI earned by certain foreign subsidiaries. In January 2018, December 31, 2019 no Valuation Allowance The Company records a valuation allowance to reduce deferred tax assets to the amount the Company believes is more likely than not may may not may At December 31, 2019, 2018 2017, The valuation allowance increased $31,674, $13,777 and $39,907 in the years ended December 31, 2019, 2018 2017 The net increase of $31,674 December 31, 2019 December 31, 2018 December 31, 2017 General Income Tax Disclosures The Company has net operating loss (“NOL”) carryforwards for federal and state income tax purposes of approximately $261,621 and $96,559, respectively at December 31, 2019 2022 2026 2018 2019 not December 31, 2019 2020, not At December 31, 2019 2024. 2021 not December 31, 2019 2027, not Pursuant to Internal Revenue Code of 1986, 382 383, June 2004 two one December 2000 second June 2004, 382 383. not not The Company’s NOL carryforwards include Cortina’s federal and state pre-acquisition NOL of $49,152 and $3,919, respectively. These NOL carryforwards will begin to expire in 2024 2026 2032 2028 2027. 2021, not 382 383. No not not" The Company operates under tax holiday in Singapore. The Singapore tax holiday allows for a reduced income tax rate of 5% effective through April 2020, December 31, 2019 January 1, 2018 December 31, 2019, 2020. December 31, 2019, 2018 2017 December 31, 2019, 2018 2017 The following table summarizes the changes in gross unrecognized tax benefits: Year Ended December 31, 2019 2018 2017 Balance as of January 1 $ 53,943 $ 47,606 $ 56,503 Increases based on tax positions related to the current year 7,926 5,747 4,656 Increases (decreases) based on tax positions of prior year (518 ) 708 (13,452 ) Statute of limitation expirations (51 ) (118 ) (101 ) Balance as of December 31 $ 61,300 $ 53,943 $ 47,606 As of December 31, 2019 may The Company recognizes interest and penalties related to unrecognized tax benefits as a component of income tax expense. The Company recorded $16, $17 and $16 in interest expense in the years ended December 31, 2019, 2018 2017 December 31, 2019, 2018 2017 The Company files income tax returns in the U.S. federal jurisdiction, various states and certain foreign jurisdictions. The Company is no December 31, 2011 December 31, 2010. may The Company does not December 31, 2019 The Company is currently under examination by the Inland Revenue Authority of Singapore (“IRAS”) for the years 2010, 2011 2012. not The Company is currently under examination by the U.S. Internal Revenue Service for year 2016. no not may

Note 11 - Earnings Per Share

Note 11 - Earnings Per Share	12 Months Ended
	Dec. 31, 2019
Notes to Financial Statements
Earnings Per Share [Text Block]	1 1 . Earnings Per Share The following securities were not Year Ended December 31, 2019 2018 2017 Common stock options 1,032,485 1,208,643 1,456,610 Unvested restricted stock unit 2,772,991 2,871,135 2,935,500 Convertible debt 10,830,038 10,830,038 10,830,038 14,635,514 14,909,816 15,222,148

Note 12 - Stock-based Compensat

Note 12 - Stock-based Compensation	12 Months Ended
	Dec. 31, 2019
Notes to Financial Statements
Share-based Payment Arrangement [Text Block]	1 2 . Stock- Based Compensation In June 2010, 2010 “2010 November 2010. 2010 2010 2010 December 31, 2019 2010 Stock Option Awards The Company did not December 31, 2019, 2018 2017 The following table summarizes information regarding options outstanding: Number of Shares Weighted Average Exercise Price Per Share Weighted Average Remaining Contractual Life Aggregate Intrinsic Value Outstanding at December 31, 2018 1,159,121 $ 12.94 2.62 $ 22,267 Exercised (253,980 ) $ 10.30 Outstanding at December 31, 2019 905,141 $ 13.68 1.81 $ 54,616 Vested and Exercisable as of December 31, 2019 905,141 $ 13.68 1.81 $ 54,616 The intrinsic value of options outstanding, exercisable and vested and expected to vest is calculated based on the difference between the exercise price and the fair value of the Company’s common stock as of the respective balance sheet dates. The total intrinsic value of options exercised during the years ended December 31, 2019, 2018 2017 December 31, 2019, 2018 2017 Restricted Stock Units and Awards The Company granted restricted stock units (“RSUs”) to members of the Board and its employees. Most of the Company’s outstanding RSUs vest over four The following table summarizes information regarding outstanding restricted stock units: Weighted Average Grant Date Number of Fair Value Shares Per Share Outstanding at December 31, 2018 4,051,685 $ 34.68 Granted 1,965,231 $ 47.85 Vested (1,811,511 ) $ 34.19 Canceled (383,080 ) $ 37.71 Outstanding at December 31, 2019 3,822,325 $ 41.38 Expected to vest in the future as of December 31, 2019 3,742,887 The RSUs include performance-based stock units subject to achievement of pre-established revenue and earnings per share goals on non-GAAP basis. Once the goals are met, the performance-based stock units are subject to four December 31, 2019 December 31, 2019 Market Value Stock Units In January 2018, may 0% 500 three first 2021 2020 may three three Total target shares 312,000 Fair value per share $ 55.81 Total amount to be recognized over the service period $ 17,413 Risk free interest rate 2.29 % Expected volatility 47.52 % Dividend yield — Employee Stock Purchase Plan In December 2011, may not six February 10 August 10 six The ESPP imposes certain limitations upon an employee’s right to acquire common stock, including the following: (i) no no may December 31, 2019, 2018 2017 The fair value of award under the employee stock purchase plan is estimated at the start of offering period using the Black-Scholes option pricing model with the following average assumptions for the years ended December 31, 2019, 2018 2017 Year Ended December 31, 2019 2018 2017 Risk-free interest rate 2.26 % 2.01 % 0.94 % Expected life (in years) 0.49 0.50 0.50 Dividend yield — — — Expected volatility 43 % 46 % 42 % Estimated fair value $ 13.35 $ 8.35 $ 11.03 Stock-Based Compensation Expense Stock-based compensation expense is included in the Company’s results of operations as follows: Year Ended December 31, 2019 2018 2017 Cost of revenue $ 6,208 $ 2,527 $ 2,045 Research and development 42,265 37,397 28,846 Sales and marketing 15,561 13,470 8,340 General and administrative 12,821 10,490 5,602 $ 76,855 $ 63,884 $ 44,833 As of December 31, 2019

Note 13 - Employee Benefit Plan

Note 13 - Employee Benefit Plan	12 Months Ended
	Dec. 31, 2019
Notes to Financial Statements
Compensation and Employee Benefit Plans [Text Block]	1 3 . Employee Benefit Plan The Company has established a 401 401 may, $1,976, $1,800 and $1,137 in c December 31, 2019, 2018 2017,

Note 14 - Fair Value Measuremen

Note 14 - Fair Value Measurements	12 Months Ended
	Dec. 31, 2019
Notes to Financial Statements
Fair Value Disclosures [Text Block]	1 4 . Fair Value Measurements The guidance on fair value measurements requires fair value measurements to be classified and disclosed in one three Level 1 Level 2 not Level 3 no The Company measures its investments in marketable securities at fair value using the market approach which uses prices and other relevant information generated by market transactions involving identical or comparable assets or liabilities. The Company has cash equivalents which consist of money market funds valued using the amortized cost method, in accordance with Rule 2a 7 1940 The convertible notes are carried on the consolidated balance sheets at their original issuance value including accreted interest, net of unamortized debt discount and issuance costs. The Convertible Notes are not December 31, 2019 2018 2 December 31, 2019 2018 The following table presents information about assets required to be carried at fair value on a recurring basis: December 31, 2019 Total Level 1 Level 2 Assets Cash equivalents: Money market funds $ 190,598 $ 67,494 $ 123,104 Commercial paper 9,465 — 9,465 Municipal bonds 1,250 — 1,250 Investments in marketable securities: U.S. Treasury securities 3,759 3,759 — Municipal bonds 6,119 — 6,119 Corporate notes/bonds 119,449 — 119,449 Asset-backed securities 4,268 — 4,268 Commercial paper 6,464 — 6,464 Certificate of deposit 72 72 — $ 341,444 $ 71,325 $ 270,119 December 31, 2018 Total Level 1 Level 2 Assets Cash equivalents: Money market funds $ 740 $ 38 $ 702 Commercial paper 96,759 — 96,759 Investments in marketable securities: Municipal bonds 6,733 — 6,733 Corporate notes/bonds 146,126 — 146,126 Variable rate demand notes 8,900 — 8,900 Asset-backed securities 32,923 — 32,923 Commercial paper 39,701 — 39,701 Certificate of deposit 956 956 — $ 332,838 $ 994 $ 331,844 As discussed in Note 2, 1 2, 3

Note 15 - Segment and Geographi

Note 15 - Segment and Geographic Information	12 Months Ended
	Dec. 31, 2019
Notes to Financial Statements
Segment Reporting Disclosure [Text Block]	1 5 . Segment and Geographic Information The Company operates in one may The following table sets forth the Company’s revenue by geographic region: Year Ended December 31, 2019 2018 2017 (in thousands) China $ 164,715 $ 113,684 $ 114,168 United States 103,402 87,545 92,620 Thailand 54,468 40,884 45,205 Other 43,050 52,377 96,208 $ 365,635 $ 294,490 $ 348,201 As of December 31, 2019 December 31, 2018,

Note 16 - Commitments and Conti

Note 16 - Commitments and Contingencies	12 Months Ended
	Dec. 31, 2019
Notes to Financial Statements
Commitments and Contingencies Disclosure [Text Block]	1 6 . Commitments and Contingencies Leases The Company has noncancelable service agreements, including software licenses, colocation and cloud services used in research and development activities expiring in various years through 2024. Future minimum lease payments under noncancelable operating leases having initial terms in excess of one December 31, 2019 2020 $ 1,508 2021 1,110 2022 515 2023 264 2024 195 $ 3,592 Noncancelable Purchase Obligations The Company depends upon third December 31, 2019 December 31, 2019 f $542. Legal Proceedings Netlist, Inc. v. Inphi Corporation, Case No. 09 6900 On September 22, 2009, No. 7,532,537. December 22, 2009, 7,619,912 7,636,274, No. 7,532,537, February 11, 2010 not 2010, 120 As to the proceeding at the USPTO, reexamination has been ordered for all of the patents that Netlist alleged to infringe. At present, the USPTO has determined that almost all of the originally filed claims are not No. 7,532,537 August 2, 2016 No. 7,636,274 November 5, 2018, 1 97, No. 7,619,912. While the Company intends to defend the foregoing USPTO proceedings and lawsuit vigorously, the USPTO proceedings and litigation, whether or not Due to the nature of USPTO proceedings and litigation, the Company is currently unable to predict the final outcome of this lawsuit and therefore cannot determine the likelihood of loss nor estimate a range of possible loss. However, because of the nature and inherent uncertainties of litigation, should the outcome of these actions be unfavorable, the Company’s business, financial condition, results of operations or cash flows could be materially and adversely affected. Claims Against eSilicon Corporation In connection with the Company's acquisition of eSilicon Corporation (“eSilicon”) as discussed in Note 17, may may Indemnifications In the ordinary course of business, the Company may not third may may not not no December 31, 2019 December 31, 2018

Note 17 - Subsequent Event

Note 17 - Subsequent Event	12 Months Ended
	Dec. 31, 2019
Notes to Financial Statements
Subsequent Events [Text Block]	1 7 . Subsequent Events In January 2020, In February 2020,

Note 18 - Supplementary Financi

Note 18 - Supplementary Financial Information (Unaudited)	12 Months Ended
	Dec. 31, 2019
Notes to Financial Statements
Quarterly Financial Information [Text Block]	18. Quarterly Results of Operations Year Ended December 31, 2019 Mar. 31, 2019 Jun. 30, 2019 Sept. 30, 2019 Dec. 31, 2019 (in thousands, except per share amounts) Revenue $ 82,223 $ 86,285 $ 94,231 $ 102,896 Gross profit 47,631 49,109 54,482 61,599 Net loss (22,745 ) (20,578 ) (16,180 ) (13,408 ) Basic earnings per share (0.51 ) (0.46 ) (0.36 ) (0.29 ) Diluted earnings per share (0.51 ) (0.46 ) (0.36 ) (0.29 ) Year Ended December 31, 2018 Mar. 31, 2018(1) Jun. 30, 2018 Sept. 30, 2018 Dec. 31, 2018(2) (in thousands, except per share amounts) Revenue $ 60,136 $ 69,814 $ 78,009 $ 86,531 Gross profit 32,546 39,611 43,462 49,526 Net loss (22,991 ) (28,464 ) (22,665 ) (21,631 ) Basic earnings per share (0.53 ) (0.65 ) (0.52 ) (0.49 ) Diluted earnings per share (0.53 ) (0.65 ) (0.52 ) (0.49 ) As further described in note 1, 2019 six nine March 31, 2019 March 31, 2018, June 30, 2019 June 30, 2018 September 30, 2019 September 30, 2018, not Management has concluded that such classification error did not 2019 2020 10 ( 1 The benefit for income taxes included partial release of federal valuation allowance resulting from the transfer of an acquired in-process research and development to developed technology in 2018 ( 2 The Company recorded a charge of $7,000 due to impairment of a non-marketable equity investment.

Significant Accounting Policies

Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2019
Accounting Policies [Abstract]
Basis of Accounting, Policy [Policy Text Block]	Basis of Presentation The accompanying consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States of America (“GAAP”) and include the accounts of the Company and subsidiaries. All intercompany balances and transactions have been eliminated in consolidation.
Reclassification, Policy [Policy Text Block]	Revisions In connection with the preparation of the Company’s 2019 not no not 2018 2017 December 31, 2018 December 31, 2017 See also note 18 2019 2018
Use of Estimates, Policy [Policy Text Block]	Use of Estimates The preparation of consolidated financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reporting period. Actual results could differ from those estimates. On an ongoing basis, management evaluates its estimates, including those related to (i) the collectibility of accounts receivable and allowance for distributors’ price discounts; (ii) write-down for excess and obsolete inventories; (iii) warranty obligations; (iv) the value assigned to and estimated useful lives of long-lived assets; (v) the realization of tax assets and estimates of tax liabilities and tax reserves; (vi) the measurement of non-marketable equity securities; (vii) amounts recorded in connection with acquisitions; (viii) recoverability of intangible assets and goodwill; and (ix) the recognition and disclosure of fair value of convertible debt and contingent liabilities. These estimates are based on historical data and experience, as well as various other factors that management believes to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying value of assets and liabilities that are not third may
Foreign Currency Transactions and Translations Policy [Policy Text Block]	Foreign Currency Translation The Company and its subsidiaries use the U.S. dollar as its functional currency. Foreign currency assets and liabilities are remeasured into U.S. dollars at the end-of-period exchange rates except for non-monetary assets and liabilities, which are remeasured at historical exchange rates. Revenue and expenses are remeasured at the exchange rate in effect during the period the transaction occurred, except for those expenses related to balance sheet amounts, which are remeasured at historical exchange rates. Gains or losses from foreign currency transactions are included in the consolidated statements of income (loss) as part of “other income, net.” Foreign currency gain (loss) in 2019, 2018 2017
Cash and Cash Equivalents, Policy [Policy Text Block]	Cash and Cash Equivalents The Company considers all highly liquid investments with an original or remaining maturity of three one may
Fair Value of Financial Instruments, Policy [Policy Text Block]	Fair Market Value of Financial Instruments The carrying amount reflected in the balance sheet for cash and cash equivalents, accounts receivable, prepaid and other current assets, accounts payable and other current liabilities, approximate fair value due to the short-term nature of these financial instruments.
Investment, Policy [Policy Text Block]	Investments Investments in marketable securities consist of available-for-sale securities. These investments are recorded at fair value with changes in fair value, net of applicable taxes, recorded as unrealized gains (losses) as a component of accumulated other comprehensive income in stockholders' equity. Realized gains and losses are included in Other income, net. The cost basis for realized gains and losses on available-for-sale securities is determined on a specific identification basis. The Company periodically evaluates whether declines in fair values of its investments below their book values are other-than-temporary. When the fair value is lower than the amortized cost, the Company considers whether: ( 1 2 not 3 not not not not On January 1, 2018, 2016 01,
Inventory, Policy [Policy Text Block]	Inventories Inventories are stated at the lower of cost and net realizable value. Cost is computed using standard cost, which approximates actual cost, on a first first not
Property, Plant and Equipment, Policy [Policy Text Block]	Property and Equipment Property and equipment are stated at cost less accumulated depreciation and amortization. Depreciation and amortization is provided on property and equipment over the estimated useful lives on a straight-line basis. Leasehold improvements are amortized on a straight-line basis over the shorter of their estimated useful lives or the related lease term. Repairs and maintenance are charged to expense as incurred. Useful lives by asset category are as follows: Asset Category Years Office equipment 3 Software 3 Leasehold improvements Shorter of lease term or estimated useful life Production equipment 2 - 5 Computer equipment 5 Lab equipment 5 Furniture and fixtures 7
Intangible Assets, Finite-Lived, Policy [Policy Text Block]	Intangible Assets Intangible assets represent rights acquired for developed technology, customer relationships, trademarks, patents and in-process research and development (“IPR&D”) in connection with business acquisitions. Intangible assets with finite useful lives are amortized over periods ranging from one ten
Goodwill and Intangible Assets, Policy [Policy Text Block]	Long-lived Assets The Company assesses the impairment of long-lived assets, which consist primarily of property and equipment and intangible assets, whenever events or changes in circumstances indicate that such assets might be impaired and the carrying value may not may If events or changes in circumstances indicate that the carrying amount of an asset may not
Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block]	Goodwill Goodwill is recorded when consideration paid for a business acquisition exceeds the fair value of net tangible and intangible assets acquired. Goodwill is measured and tested for impairment on an annual basis during the fourth To review for impairment, the Company first not not not no not 2019, 2018 2017.
Internal Use Software, Policy [Policy Text Block]	Internal Use Software Costs Certain external computer software costs acquired for internal use are capitalized. Training costs and maintenance are expensed as incurred, while upgrades and enhancements are capitalized if it is probable that such expenditures will result in additional functionality. Capitalized costs are included within property and equipment. If a cloud computing arrangement includes a software license, then the Company accounts for the software license element of the arrangement consistent with the acquisition of other software licenses. If a cloud computing arrangement does not
Revenue [Policy Text Block]	Revenue Recognition Prior to January 1, 2018, On January 1, 2018, 2014 09, 606 not January 1, 2018. no January 1, 2018. January 1, 2018, December 31, 2018 December 31, 2018, January 1, 2018 not The following table shows revenue by geography, based on the receiving location of customers: Year Ended December 31, 2019 2018 2017 (in thousands) China $ 164,715 $ 113,684 $ 114,168 United States 103,402 87,545 92,620 Thailand 54,468 40,884 45,205 Other 43,050 52,377 96,208 $ 365,635 $ 294,490 $ 348,201 The Company recognizes revenue when control of the promised goods or services is transferred to customers in an amount that reflects the consideration the Company expects to receive in exchange for such goods or services. Product Revenue The Company’s products are fully functional at the time of shipment and do not may not December 31, 2019 2018, 30 60 one two Other Revenue Occasionally, the Company enters into license and development agreements with some of its customers and recognizes revenue from these agreements upon completion and acceptance by the customer of contract deliverables or as services are provided, depending on the terms of the arrangement. Revenue is deferred for any amounts billed or received prior to transfer of control. The Company believes the milestone method best depicts the efforts expended to transfer services to the customers under most of the Company’s development agreements. Certain contracts may not The Company does not one 2020 2021 December 31, 2019 Revenue from non-product sales was approximately 7%, 3% and 3% of total revenue for the years ended December 31, 2019, 2018, 2017 The Company monitors the collectability of accounts receivable primarily through review of the accounts receivable aging. The Company’s policy is to record an allowance for doubtful accounts based on specific collection issues identified, aging of underlying receivables and historical experience of uncollectible balances.
Cost of Goods and Service [Policy Text Block]	Cost of Revenue Cost of revenue includes cost of materials, such as wafers processed by third
Standard Product Warranty, Policy [Policy Text Block]	Warranty The Company’s products are under warranty against defects in material and workmanship generally for a period of one two may December 31, 2019 2018
Research and Development Expense, Policy [Policy Text Block]	Research and Development Expense Research and development expense consists of costs incurred in performing research and development activities including salaries, stock-based compensation, employee benefits, occupancy costs, pre-production engineering mask costs, impairment of in-process research and development, overhead costs and prototype wafer, packaging and test costs. Research and development costs are expensed as incurred. The Company enters into development agreements with some of the Company’s customers. Recoveries from nonrecurring engineering services from early stage technology are recorded as an offset to product development expense incurred in support of this effort and serve as a mechanism to partially recover development expenditures. These reimbursements are recognized upon completion and acceptance by the customer of contract deliverables or milestones. The Company recorded approximately $0, $0 and $3,000 as offset to research and development expense for the years ended December 31, 2019, 2018 2017
Selling and Marketing [Policy Text Block]	Sales and Marketing Expense Sales and marketing expense consists of salaries, stock-based compensation, employee benefits, travel, trade show costs, amortization of intangibles and others. The Company expenses sales and marketing costs as incurred. Advertising expenses for the years ended December 31, 2019, 2018 2017 not
Selling, General and Administrative Expenses, Policy [Policy Text Block]	General and Administrative Expense General and administrative expense consists of salaries, stock-based compensation, employee benefits and expenses for executive management, legal, finance and others. In addition, general and administrative expense includes fees for professional services and occupancy costs. These costs are expensed as incurred.
Income Tax, Policy [Policy Text Block]	Income Taxes Deferred tax assets and liabilities are determined based on differences between financial reporting and tax bases of assets and liabilities, and are measured using the enacted tax rates and laws that will be in effect when the differences are expected to reverse. The Company recognizes the deferred income tax effects of a change in tax rates in the period of enactment. The Company must also make judgments in evaluating whether deferred tax assets will be recovered from future taxable income. To the extent that it believes that recovery is not not not not” may may The Company regularly performs a comprehensive review of uncertain tax positions. An uncertain tax position represents an expected treatment of a tax position taken in a filed tax return, or planned to be taken in a future tax return or claim, which has not not On December 22, 2017, January 1, 2018, one 100% first 21%. 118 118” one 118, December 31, 2017, 21%, 2018, 2017 no December 31, 2018,
Share-based Payment Arrangement [Policy Text Block]	Stock-Based Compensation Stock-based compensation for stock option and restricted stock units issued to the Company’s employees is measured at the grant date based on the fair value of the award and is recognized as expense over the requisite service period, which is the vesting period, on a straight-line basis or graded vesting basis for awards with performance or market-based conditions. The fair value of restricted stock units is based on the fair market value of the Company’s common stock on the date of grant. If the award has a market condition, the Company estimates the fair value using Monte Carlo simulation model and recognizes compensation ratably over the service period. The Company has elected to treat share-based payment awards with graded vesting schedules and time-based service conditions as single awards and recognizes stock-based compensation expense on a straight-line basis (net of estimated forfeitures) over the requisite service period. The Company recognizes non-employee stock-based compensation expense based on the estimated fair value of the equity instrument determined using the Black-Scholes option pricing model or fair value of the Company's common stock. Management believes that the fair value of the underlying stock award is more reliably measured than the fair value of the services received. The fair value of each non-employee variable stock award is re-measured each period until a commitment date is reached, which is generally the vesting date. Starting January 1, 2019, no
Earnings Per Share, Policy [Policy Text Block]	Earnings per Share Basic earnings per share is calculated by dividing income allocable to common stockholders by the weighted average number of shares of common stock outstanding during the period. Diluted earnings per share is calculated by dividing the net income allocable to common stockholders by the weighted average number of common shares outstanding, adjusted for the effects of potentially dilutive common stock, which are comprised of stock options, restricted stock units, employee share purchase plan and the shares that could be issued upon conversion of the Company’s convertible debt. The capped call options in connection with the issuance of the convertible notes are excluded from the calculation of diluted earnings per share as their impact is always anti-dilutive.
Segment Reporting, Policy [Policy Text Block]	Segment Information The Company operates in one
New Accounting Pronouncements, Policy [Policy Text Block]	Recent Accounting Pronouncements In February 2016, 12 twelve not January 1, 2019. 7 In June 2016, December 15, 2019. not In January 2017, 2 2 December 15, 2019, January 1, 2019. not In February 2018, December 15, 2018. January 1, 2019. not In June 2018, December 15, 2018. January 1, 2019. not In August 2018, no 1 2 3 December 15, 2019. not In August 2018, 350 40 December 15, 2019. not In November 2018, not December 15, 2019. not In December 2019, 740, December 15, 2020,

Note 1 - Organization and Sum_2

Note 1 - Organization and Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2019
Notes Tables
Schedule of Estimated Useful Lives of Long-lived Assets [Table Text Block]	Asset Category Years Office equipment 3 Software 3 Leasehold improvements Shorter of lease term or estimated useful life Production equipment 2 - 5 Computer equipment 5 Lab equipment 5 Furniture and fixtures 7
Disaggregation of Revenue [Table Text Block]	Year Ended December 31, 2019 2018 2017 (in thousands) China $ 164,715 $ 113,684 $ 114,168 United States 103,402 87,545 92,620 Thailand 54,468 40,884 45,205 Other 43,050 52,377 96,208 $ 365,635 $ 294,490 $ 348,201

Note 2 - Investments (Tables)

Note 2 - Investments (Tables)	12 Months Ended
	Dec. 31, 2019
Notes Tables
Available-for-sale Securities [Table Text Block]	December 31, 2019 Cost Gross Unrealized Gain Gross Unrealized Loss Fair Value Available-for-sale securities: U.S. Treasury securities $ 3,752 $ 7 $ — $ 3,759 Municipal bonds 6,062 57 — 6,119 Corporate notes/bonds 118,859 591 (1 ) 119,449 Asset-backed securities 4,239 29 — 4,268 Commercial paper 6,464 1 (1 ) 6,464 Certificate of deposit 72 — — 72 Total investments $ 139,448 $ 685 $ (2 ) $ 140,131 December 31, 2018 Cost Gross Unrealized Gain Gross Unrealized Loss Fair Value Available-for-sale securities: Municipal bonds $ 6,751 $ 1 $ (19 ) $ 6,733 Corporate notes/bonds 146,466 14 (354 ) 146,126 Variable rate demand notes 8,900 — — 8,900 Asset-backed securities 32,986 — (63 ) 32,923 Commercial paper 39,707 — (6 ) 39,701 Certificate of deposit 956 — — 956 Total investments $ 235,766 $ 15 $ (442 ) $ 235,339
Investments Classified by Contractual Maturity Date [Table Text Block]	Cost Fair Value Due in one year or less $ 88,803 $ 89,049 Due between one and five years 50,645 51,082 $ 139,448 $ 140,131

Note 3 - Concentrations (Tables

Note 3 - Concentrations (Tables)	12 Months Ended
	Dec. 31, 2019
Notes Tables
Schedules of Concentration of Risk, by Risk Factor [Table Text Block]	December 31, Accounts Receivable 2019 2018 Customer A 15 % 13 % Customer B 13 13 Customer C * * Customer D 19 * Customer E * * Year Ended December 31, Revenue 2019 2018 2017 Customer A 14 % 18 % 12 % Customer B * * 12 Customer C 11 * * Customer D * * * Customer E * 11 *

Note 4 - Inventories (Tables)

Note 4 - Inventories (Tables)	12 Months Ended
	Dec. 31, 2019
Notes Tables
Schedule of Inventory, Current [Table Text Block]	December 31, 2019 2018 Raw materials $ 18,593 $ 12,435 Work in process 19,081 13,602 Finished goods 17,339 7,015 $ 55,013 $ 33,052

Note 5 - Property and Equipme_2

Note 5 - Property and Equipment, Net (Tables)	12 Months Ended
	Dec. 31, 2019
Notes Tables
Property, Plant and Equipment [Table Text Block]	December 31, 2019 2018 Laboratory and production equipment $ 144,866 $ 121,716 Office, software and computer equipment 37,241 30,190 Furniture and fixtures 1,617 1,558 Leasehold improvements 8,282 7,609 192,006 161,073 Less accumulated depreciation (112,443 ) (90,333 ) $ 79,563 $ 70,740

Note 6 - Intangible Assets (Tab

Note 6 - Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2019
Notes Tables
Schedule of Finite-Lived Intangible Assets [Table Text Block]	December 31, 2019 December 31, 2018 Gross Accumulated Amortization Net Gross Accumulated Amortization Net Developed technology $ 186,800 $ 123,365 $ 63,435 $ 186,800 $ 86,378 $ 100,422 Customer relationships 70,540 31,409 39,131 70,540 21,681 48,859 Trade name 2,310 1,766 544 2,310 1,350 960 Patents 1,579 1,010 569 1,579 881 698 Software 74,022 9,411 64,611 61,406 31,898 29,508 $ 335,251 $ 166,961 $ 168,290 $ 322,635 $ 142,188 $ 180,447
Finite-lived Intangible Assets Amortization Expense [Table Text Block]	Year Ended December 31, 2019 2018 2017 Cost of revenue $ 36,987 $ 32,845 $ 28,502 Research and development 22,305 19,311 18,352 Sales and marketing 9,728 9,727 9,727 General and administrative 545 609 643 $ 69,565 $ 62,492 $ 57,224
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]	2020 $ 56,558 2021 52,469 2022 42,656 2023 15,769 2024 672 Thereafter 166 $ 168,290
Finite Lived Intangible Assets Remaining Amortization Period [Table Text Block]	Developed technology 3.0 Customer relationship 4.0 Trade name 2.0 Patents 7.6 Software 2.7

Note 7 - Leases (Tables)

Note 7 - Leases (Tables)	12 Months Ended
	Dec. 31, 2019
Notes Tables
Lease, Cost [Table Text Block]	Operating lease expense $ 5,094 Cash paid for leases $ 4,585 Right of use assets obtained in exchange for lease obligations $ 27,639 Weighted average remaining lease term (years) 8.52 Weighted average discount rate 3.9 %
Lessee, Operating Lease, Liability, Maturity [Table Text Block]	2020 $ 4,455 2021 6,174 2022 6,351 2023 6,266 2024 6,073 Thereafter 23,630 Total future minimum lease payments 52,949 Less: Imputed interest 8,006 Lease incentive recognized as offset to asset liability 1,324 Present value of lease obligations $ 43,619
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]	2019 $ 4,588 2020 2,252 2021 1,883 2022 1,722 2023 1,615 2024 and thereafter 1,698 Total $ 13,758

Note 8 - Convertible Debt (Tabl

Note 8 - Convertible Debt (Tables)	12 Months Ended
	Dec. 31, 2019
Notes Tables
Schedule of Long-term Debt Instruments [Table Text Block]	December 31, December 31, 2019 2018 Principal $ 517,500 $ 517,500 Less: Unamortized debt discount (38,105 ) (64,222 ) Unamortized debt issuance costs (3,217 ) (5,453 ) Net carrying amount of long-term debt 476,178 447,825 Less current portion of long-term debt 217,467 — Long-term debt, non-current portion $ 258,711 $ 447,825
Convertible Debt [Table Text Block]	Year Ended December 31, 2019 2018 2017 Contractual interest expense $ 2,586 $ 2,587 $ 2,588 Amortization of debt discount 11,645 10,833 10,079 Amortization of debt issuance costs 1,050 976 907 Total interest expense $ 15,281 $ 14,396 $ 13,574 Year Ended December 31, 2019 2018 2017 Contractual interest expense $ 2,152 $ 2,156 $ 2,154 Amortization of debt discount 14,472 13,481 12,559 Amortization of debt issuance costs 1,186 1,104 1,029 Total interest expense $ 17,810 $ 16,741 $ 15,742

Note 9 - Other Liabilities (Tab

Note 9 - Other Liabilities (Tables)	12 Months Ended
	Dec. 31, 2019
Notes Tables
Other Current Liabilities [Table Text Block]	December 31, 2019 2018 Software license intangible asset liability $ 25,810 $ 21,945 Operating lease liability 2,545 — Others 5,176 2,374 $ 33,531 $ 24,319
Other Noncurrent Liabilities [Table Text Block]	December 31, 2019 2018 Deferred rent $ 26 $ 1,100 Income tax payable 692 706 Software license intangible asset liability 36,144 7,961 Operating lease liability 41,074 — Others 981 1,144 $ 78,917 $ 10,911

Note 10 - Income Taxes (Tables)

Note 10 - Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2019
Notes Tables
Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]	Year Ended December 31, 2019 2018 2017 United States $ (60,313 ) $ (71,978 ) $ (77,649 ) Foreign (12,202 ) (31,984 ) (18,431 ) Total $ (72,515 ) $ (103,962 ) $ (96,080 )
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]	Year Ended December 31, 2019 2018 2017 Current: U.S. Federal $ — $ — $ 96 U.S. State (11 ) 42 51 Foreign 70 375 1,105 59 417 1,252 Deferred: U.S. Federal — (6,734 ) (11,312 ) U.S. State — — (613 ) Foreign 337 (1,894 ) (10,503 ) 337 (8,628 ) (22,428 ) Total $ 396 $ (8,211 ) $ (21,176 )
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]	Year Ended December 31, 2019 2018 2017 Benefit at statutory rate $ (15,228 ) $ (21,832 ) $ (32,562 ) State income taxes (587 ) 594 (585 ) Research and development credits (16,933 ) (13,283 ) (12,983 ) Change in valuation allowance 31,917 13,757 40,028 Impact of foreign operations (1,045 ) 5,925 (1,951 ) Unrecognized tax benefits 6,725 5,340 3,596 Stock-based compensation (4,731 ) (381 ) (10,248 ) Prior year return to provision adjustment (1,167 ) 1,422 1,105 Section 162(m) 1,046 — — Effect of U. S. tax law change — — (4,602 ) Impairment of intangibles — — (2,328 ) Other 399 247 (646 ) $ 396 $ (8,211 ) $ (21,176 )
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]	December 31, 2019 2018 Deferred tax assets Net operating loss carry forwards $ 48,481 $ 39,888 Research and development credits 84,268 69,320 Stock-based compensation 8,884 9,055 Accrued expenses and allowances 1,897 2,334 Amortization and depreciation — 1,408 Operating lease liability 7,345 — Other temporary differences 6,884 6,411 Foreign tax credit 2,338 2,338 Valuation allowance (123,989 ) (92,315 ) Total deferred tax assets 36,108 38,439 Deferred tax liabilities Acquired intangible assets (16,092 ) (22,593 ) Convertible debt (6,444 ) (11,596 ) Amortization and depreciation (2,123 ) — Right of use asset (6,806 ) — Other deferred tax liabilities (1,482 ) (603 ) Total deferred tax liabilities (32,947 ) (34,792 ) Deferred tax assets, net $ 3,161 $ 3,647
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]	Year Ended December 31, 2019 2018 2017 Balance as of January 1 $ 53,943 $ 47,606 $ 56,503 Increases based on tax positions related to the current year 7,926 5,747 4,656 Increases (decreases) based on tax positions of prior year (518 ) 708 (13,452 ) Statute of limitation expirations (51 ) (118 ) (101 ) Balance as of December 31 $ 61,300 $ 53,943 $ 47,606

Note 11 - Earnings Per Share (T

Note 11 - Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2019
Notes Tables
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]	Year Ended December 31, 2019 2018 2017 Common stock options 1,032,485 1,208,643 1,456,610 Unvested restricted stock unit 2,772,991 2,871,135 2,935,500 Convertible debt 10,830,038 10,830,038 10,830,038 14,635,514 14,909,816 15,222,148

Note 12 - Stock-based Compens_2

Note 12 - Stock-based Compensation (Tables)	12 Months Ended
	Dec. 31, 2019
Notes Tables
Share-based Payment Arrangement, Option, Activity [Table Text Block]	Number of Shares Weighted Average Exercise Price Per Share Weighted Average Remaining Contractual Life Aggregate Intrinsic Value Outstanding at December 31, 2018 1,159,121 $ 12.94 2.62 $ 22,267 Exercised (253,980 ) $ 10.30 Outstanding at December 31, 2019 905,141 $ 13.68 1.81 $ 54,616 Vested and Exercisable as of December 31, 2019 905,141 $ 13.68 1.81 $ 54,616
Share-based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block]	Weighted Average Grant Date Number of Fair Value Shares Per Share Outstanding at December 31, 2018 4,051,685 $ 34.68 Granted 1,965,231 $ 47.85 Vested (1,811,511 ) $ 34.19 Canceled (383,080 ) $ 37.71 Outstanding at December 31, 2019 3,822,325 $ 41.38 Expected to vest in the future as of December 31, 2019 3,742,887
Schedule of Share-based Payment Award, Equity Instruments Other than Option, Valuation Assumptions [Table Text Block]	Total target shares 312,000 Fair value per share $ 55.81 Total amount to be recognized over the service period $ 17,413 Risk free interest rate 2.29 % Expected volatility 47.52 % Dividend yield —
Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions [Table Text Block]	Year Ended December 31, 2019 2018 2017 Risk-free interest rate 2.26 % 2.01 % 0.94 % Expected life (in years) 0.49 0.50 0.50 Dividend yield — — — Expected volatility 43 % 46 % 42 % Estimated fair value $ 13.35 $ 8.35 $ 11.03
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]	Year Ended December 31, 2019 2018 2017 Cost of revenue $ 6,208 $ 2,527 $ 2,045 Research and development 42,265 37,397 28,846 Sales and marketing 15,561 13,470 8,340 General and administrative 12,821 10,490 5,602 $ 76,855 $ 63,884 $ 44,833

Note 14 - Fair Value Measurem_2

Note 14 - Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2019
Notes Tables
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]	December 31, 2019 Total Level 1 Level 2 Assets Cash equivalents: Money market funds $ 190,598 $ 67,494 $ 123,104 Commercial paper 9,465 — 9,465 Municipal bonds 1,250 — 1,250 Investments in marketable securities: U.S. Treasury securities 3,759 3,759 — Municipal bonds 6,119 — 6,119 Corporate notes/bonds 119,449 — 119,449 Asset-backed securities 4,268 — 4,268 Commercial paper 6,464 — 6,464 Certificate of deposit 72 72 — $ 341,444 $ 71,325 $ 270,119 December 31, 2018 Total Level 1 Level 2 Assets Cash equivalents: Money market funds $ 740 $ 38 $ 702 Commercial paper 96,759 — 96,759 Investments in marketable securities: Municipal bonds 6,733 — 6,733 Corporate notes/bonds 146,126 — 146,126 Variable rate demand notes 8,900 — 8,900 Asset-backed securities 32,923 — 32,923 Commercial paper 39,701 — 39,701 Certificate of deposit 956 956 — $ 332,838 $ 994 $ 331,844

Note 15 - Segment and Geograp_2

Note 15 - Segment and Geographic Information (Tables)	12 Months Ended
	Dec. 31, 2019
Notes Tables
Revenue from External Customers by Geographic Areas [Table Text Block]	Year Ended December 31, 2019 2018 2017 (in thousands) China $ 164,715 $ 113,684 $ 114,168 United States 103,402 87,545 92,620 Thailand 54,468 40,884 45,205 Other 43,050 52,377 96,208 $ 365,635 $ 294,490 $ 348,201

Note 16 - Commitments and Con_2

Note 16 - Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2019
Notes Tables
Unrecorded Unconditional Purchase Obligations Disclosure [Table Text Block]	December 31, 2019 2020 $ 1,508 2021 1,110 2022 515 2023 264 2024 195 $ 3,592

Note 18 - Supplementary Finan_2

Note 18 - Supplementary Financial Information (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2019
Notes Tables
Quarterly Financial Information [Table Text Block]	Year Ended December 31, 2019 Mar. 31, 2019 Jun. 30, 2019 Sept. 30, 2019 Dec. 31, 2019 (in thousands, except per share amounts) Revenue $ 82,223 $ 86,285 $ 94,231 $ 102,896 Gross profit 47,631 49,109 54,482 61,599 Net loss (22,745 ) (20,578 ) (16,180 ) (13,408 ) Basic earnings per share (0.51 ) (0.46 ) (0.36 ) (0.29 ) Diluted earnings per share (0.51 ) (0.46 ) (0.36 ) (0.29 ) Year Ended December 31, 2018 Mar. 31, 2018(1) Jun. 30, 2018 Sept. 30, 2018 Dec. 31, 2018(2) (in thousands, except per share amounts) Revenue $ 60,136 $ 69,814 $ 78,009 $ 86,531 Gross profit 32,546 39,611 43,462 49,526 Net loss (22,991 ) (28,464 ) (22,665 ) (21,631 ) Basic earnings per share (0.53 ) (0.65 ) (0.52 ) (0.49 ) Diluted earnings per share (0.53 ) (0.65 ) (0.52 ) (0.49 )

Note 1 - Organization and Sum_3

Note 1 - Organization and Summary of Significant Accounting Policies 1 (Details Textual) $ in Thousands	3 Months Ended										12 Months Ended
	Dec. 31, 2019USD ($)	Sep. 30, 2019USD ($)	Jun. 30, 2019USD ($)	Mar. 31, 2019USD ($)	Dec. 31, 2018USD ($)		Sep. 30, 2018USD ($)	Jun. 30, 2018USD ($)	Mar. 31, 2018USD ($)	[2]	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Jan. 01, 2018USD ($)
Net Cash Provided by (Used in) Investing Activities, Total											$ 63,017	$ (35,650)	$ (24,653)
Net Cash Provided by (Used in) Financing Activities, Total											(49,256)	(33,941)	(34,072)
Foreign Currency Transaction Gain (Loss), before Tax, Total											(453)	(135)	22
Goodwill, Impairment Loss											0	0	0
Revenue from Contract with Customer, Excluding Assessed Tax, Total	$ 102,896	$ 94,231	$ 86,285	$ 82,223	$ 86,531	[1]	$ 78,009	$ 69,814	$ 60,136		365,635	294,490	348,201
Cost of Goods and Services Sold, Total											152,814	129,345	151,698
Inventory, Net, Total	55,013				33,052						55,013	33,052
Reimbursements from Research and Development Contracts											$ 0	$ 0	$ 3,000
Effective Income Tax Rate Reconciliation, at Highest Federal Statutory Income Tax Rate, Percent													35.00%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent											21.00%	21.00%	34.00%
Tax Cuts and Jobs Act, Transition Tax for Accumulated Foreign Earnings, Liability, Total	0										$ 0
Number of Reportable Segments											1	1	1
Licenses for Intellectual Property [Member]
Percent of Revenue From Nonproduct Sales											7.00%	3.00%	3.00%
Minimum [Member]
Finite-Lived Intangible Asset, Useful Life											1 year
Product Warranty Term											1 year
Maximum [Member]
Finite-Lived Intangible Asset, Useful Life											10 years
Product Warranty Term											2 years
Accounting Standards Update 2016-01 [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption					0							$ 0		$ 0
Accounting Standards Update 2014-09 [Member]
Revenue from Contract with Customer, Excluding Assessed Tax, Total												3,778
Cost of Goods and Services Sold, Total												779
Deferred Revenue, Total					3,778							3,778
Inventory, Net, Total					779							779
Contract with Customer, Refund Liability, Total	$ 656				$ 1,634						$ 656	1,634
Revision [Member]
Net Cash Provided by (Used in) Investing Activities, Total												21,311	$ 13,688
Net Cash Provided by (Used in) Financing Activities, Total												(21,311)	(13,688)
Previously Reported [Member]
Net Cash Provided by (Used in) Investing Activities, Total												(56,961)	(38,341)
Net Cash Provided by (Used in) Financing Activities, Total												$ (12,630)	$ (20,384)
[1]	The Company recorded a charge of $7,000 due to impairment of a non-marketable equity investment.
[2]	The benefit for income taxes included partial release of federal valuation allowance resulting from the transfer of an acquired in-process research and development to developed technology in 2018 which allowed the related deferred tax liability to be considered a source of income for realizing deferred tax assets, as well as the revaluation of the foreign deferred tax liability on the in-process research and development based on the foreign tax rates applicable to the anticipated reversal periods.

Note 1 - Organization and Sum_4

Note 1 - Organization and Summary of Significant Accounting Policies 2 (Details Textual) $ in Thousands	Dec. 31, 2019USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Amount	$ 12,338
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Amount	$ 7,790

Note 1 - Organization and Sum_5

Note 1 - Organization and Summary of Significant Accounting Policies - Useful Lives by Asset Category (Details)	12 Months Ended
	Dec. 31, 2019
Office Equipment [Member]
Estimated useful life (Year)	3 years
Software and Software Development Costs [Member]
Estimated useful life (Year)	3 years
Leasehold Improvements [Member]
Estimated useful life	Shorter of lease term or estimated useful life
Equipment [Member] | Minimum [Member]
Estimated useful life (Year)	2 years
Equipment [Member] | Maximum [Member]
Estimated useful life (Year)	5 years
Computer Equipment [Member]
Estimated useful life (Year)	5 years
Lab Equipment [Member]
Estimated useful life (Year)	5 years
Furniture and Fixtures [Member]
Estimated useful life (Year)	7 years

Note 1 - Organization and Sum_6

Note 1 - Organization and Summary of Significant Accounting Policies - Revenue by Geography (Details) - USD ($) $ in Thousands	3 Months Ended										12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	[1]	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	[2]	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenue	$ 102,896	$ 94,231	$ 86,285	$ 82,223	$ 86,531		$ 78,009	$ 69,814	$ 60,136		$ 365,635	$ 294,490	$ 348,201
CHINA
Revenue											164,715	113,684	114,168
UNITED STATES
Revenue											103,402	87,545	92,620
THAILAND
Revenue											54,468	40,884	45,205
Other Country [Member]
Revenue											$ 43,050	$ 52,377	$ 96,208
[1]	The Company recorded a charge of $7,000 due to impairment of a non-marketable equity investment.
[2]	The benefit for income taxes included partial release of federal valuation allowance resulting from the transfer of an acquired in-process research and development to developed technology in 2018 which allowed the related deferred tax liability to be considered a source of income for realizing deferred tax assets, as well as the revaluation of the foreign deferred tax liability on the in-process research and development based on the foreign tax rates applicable to the anticipated reversal periods.

Note 2 - Investments (Details T

Note 2 - Investments (Details Textual) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Jan. 01, 2018USD ($)
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	3
Proceeds from Sale and Maturity of Other Investments, Total	$ 3,424	$ 2,414	$ 0
Gain on Sale of Investments	924	0	0
Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Annual Amount	1,926	3,066
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Annual Amount	0	7,000	$ 0
Other Noncurrent Assets [Member]
Equity Securities without Readily Determinable Fair Value, Amount	25,792	16,866
Other Noncurrent Assets [Member] | Equity Securities, Fair Value Based on Observable Transaction [Member]
Equity Securities without Readily Determinable Fair Value, Amount	8,792	6,066
Accounting Standards Update 2016-01 [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption		0		$ 0
Other Income [Member]
Gain on Sale of Investments	924
TAIWAN, PROVINCE OF CHINA
Equity Securities, FV-NI	1,662	1,387
Equity Securities, FV-NI, Unrealized Loss	$ 332	$ 607

Note 2 - Investments - Summary

Note 2 - Investments - Summary of Investments by Investment (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Available-for-sale securities, amortized cost	$ 139,448	$ 235,766
Available-for-sale securities, gross unrealized gain	685	15
Available-for-sale securities, gross unrealized loss	(2)	(442)
Available-for-sale securities, fair value	140,131	235,339
US Treasury Securities [Member]
Available-for-sale securities, amortized cost	3,752
Available-for-sale securities, gross unrealized gain	7
Available-for-sale securities, gross unrealized loss	0
Available-for-sale securities, fair value	3,759
US States and Political Subdivisions Debt Securities [Member]
Available-for-sale securities, amortized cost	6,062	6,751
Available-for-sale securities, gross unrealized gain	57	1
Available-for-sale securities, gross unrealized loss	0	(19)
Available-for-sale securities, fair value	6,119	6,733
Corporate Debt Securities [Member]
Available-for-sale securities, amortized cost	118,859	146,466
Available-for-sale securities, gross unrealized gain	591	14
Available-for-sale securities, gross unrealized loss	(1)	(354)
Available-for-sale securities, fair value	119,449	146,126
Variable Rate Demand Note [Member]
Available-for-sale securities, amortized cost		8,900
Available-for-sale securities, gross unrealized gain		0
Available-for-sale securities, gross unrealized loss		0
Available-for-sale securities, fair value		8,900
Asset-backed Securities [Member]
Available-for-sale securities, amortized cost	4,239	32,986
Available-for-sale securities, gross unrealized gain	29	0
Available-for-sale securities, gross unrealized loss	0	(63)
Available-for-sale securities, fair value	4,268	32,923
Commercial Paper [Member]
Available-for-sale securities, amortized cost	6,464	39,707
Available-for-sale securities, gross unrealized gain	1	0
Available-for-sale securities, gross unrealized loss	(1)	(6)
Available-for-sale securities, fair value	6,464	39,701
Certificates of Deposit [Member]
Available-for-sale securities, amortized cost	72	956
Available-for-sale securities, gross unrealized gain	0	0
Available-for-sale securities, gross unrealized loss	0	0
Available-for-sale securities, fair value	$ 72	$ 956

Note 2 - Investments - Contract

Note 2 - Investments - Contractual Maturities of Available-for-sale Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Due in one year or less, cost	$ 88,803
Due in one year or less, fair value	89,049
Due between one and five years, cost	50,645
Due between one and five years, fair value	51,082
Available-for-sale securities, cost	139,448	$ 235,766
Available-for-sale securities, fair value	$ 140,131	$ 235,339

Note 3 - Concentrations (Detail

Note 3 - Concentrations (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accounts Receivable, Allowance for Credit Loss, Ending Balance	$ 1,152	$ 1,152
Allowance for Distributors' Price Adjustment	$ 656	$ 1,634
Customer Concentration Risk [Member] | Revenue from Contract with Customer Benchmark [Member] | Customer A and F [Member]
Concentration Risk, Percentage	14.00%	18.00%	17.00%
Customer Concentration Risk [Member] | Revenue from Contract with Customer Benchmark [Member] | Customer B and G [Member]
Concentration Risk, Percentage	11.00%	14.00%	14.00%
Customer Concentration Risk [Member] | Revenue from Contract with Customer Benchmark [Member] | Customer H [Member]
Concentration Risk, Percentage		11.00%	11.00%

Note 3 - Concentrations - Conce

Note 3 - Concentrations - Concentration Risk, by Risk Factor (Details) - Customer Concentration Risk [Member]	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accounts Receivable [Member] | Customer A [Member]
Concentration risk, percentage	15.00%	13.00%
Accounts Receivable [Member] | Customer B [Member]
Concentration risk, percentage	13.00%	13.00%
Accounts Receivable [Member] | Customer D [Member]
Concentration risk, percentage	19.00%
Revenue from Contract with Customer Benchmark [Member] | Customer A [Member]
Concentration risk, percentage	14.00%	18.00%	12.00%
Revenue from Contract with Customer Benchmark [Member] | Customer B [Member]
Concentration risk, percentage			12.00%
Revenue from Contract with Customer Benchmark [Member] | Customer C [Member]
Concentration risk, percentage	11.00%
Revenue from Contract with Customer Benchmark [Member] | Customer E [Member]
Concentration risk, percentage		11.00%

Note 4 - Inventories - Schedule

Note 4 - Inventories - Schedule of Inventory (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Raw materials	$ 18,593	$ 12,435
Work in process	19,081	13,602
Finished goods	17,339	7,015
	$ 55,013	$ 33,052

Note 5 - Property and Equipme_3

Note 5 - Property and Equipment, Net (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Depreciation, Total	$ 22,399	$ 20,227	$ 20,631
Capitalized Computer Software, Gross	7,339	6,879
Capitalized Computer Software, Amortization	384	591	$ 1,038
Capital Expenditures Incurred but Not yet Paid	$ 4,728	$ 2,580

Note 5 - Property and Equipme_4

Note 5 - Property and Equipment, Net - Property and Equipment Components (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Property and equipment, gross	$ 192,006	$ 161,073
Less accumulated depreciation	(112,443)	(90,333)
Total property and equipment	79,563	70,740
Equipment [Member]
Property and equipment, gross	144,866	121,716
Office, Software, and Computer Equipment [Member]
Property and equipment, gross	37,241	30,190
Furniture and Fixtures [Member]
Property and equipment, gross	1,617	1,558
Leasehold Improvements [Member]
Property and equipment, gross	$ 8,282	$ 7,609

Note 6 - Intangible Assets (Det

Note 6 - Intangible Assets (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current Period Reclassification Adjustment		$ 60,500
Impairment of Intangible Assets (Excluding Goodwill), Total	$ 0	$ 0	$ 47,014
ClariPhy Communications Inc.[Member]
Impairment of Intangible Assets (Excluding Goodwill), Total			47,014
ClariPhy Communications Inc.[Member] | Cost of Sales [Member]
Impairment of Intangible Assets (Excluding Goodwill), Total			10,174
ClariPhy Communications Inc.[Member] | Research and Development Expense [Member]
Impairment of Intangible Assets (Excluding Goodwill), Total			$ 36,840

Note 6 - Intangible Assets - Id

Note 6 - Intangible Assets - Identifiable Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Intangible assets, gross	$ 335,251	$ 322,635
Intangible assets, accumulated amortization	166,961	142,188
Intangible assets, net	168,290	180,447
Developed Technology Rights [Member]
Intangible assets, gross	186,800	186,800
Intangible assets, accumulated amortization	123,365	86,378
Intangible assets, net	63,435	100,422
Customer Relationships [Member]
Intangible assets, gross	70,540	70,540
Intangible assets, accumulated amortization	31,409	21,681
Intangible assets, net	39,131	48,859
Trade Names [Member]
Intangible assets, gross	2,310	2,310
Intangible assets, accumulated amortization	1,766	1,350
Intangible assets, net	544	960
Patents [Member]
Intangible assets, gross	1,579	1,579
Intangible assets, accumulated amortization	1,010	881
Intangible assets, net	569	698
Computer Software, Intangible Asset [Member]
Intangible assets, gross	74,022	61,406
Intangible assets, accumulated amortization	9,411	31,898
Intangible assets, net	$ 64,611	$ 29,508

Note 6 - Intangible Assets - Am

Note 6 - Intangible Assets - Amortization (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Amortization of intangible assets	$ 69,565	$ 62,492	$ 57,224
Cost of Sales [Member]
Amortization of intangible assets	36,987	32,845	28,502
Research and Development Expense [Member]
Amortization of intangible assets	22,305	19,311	18,352
Selling and Marketing Expense [Member]
Amortization of intangible assets	9,728	9,727	9,727
General and Administrative Expense [Member]
Amortization of intangible assets	$ 545	$ 609	$ 643

Note 6 - Intangible Assets - Ex

Note 6 - Intangible Assets - Expected Amortization Expense (Details) $ in Thousands	Dec. 31, 2019USD ($)
2020	$ 56,558
2021	52,469
2022	42,656
2023	15,769
2024	672
Thereafter	166
	$ 168,290

Note 6 - Intangible Assets - We

Note 6 - Intangible Assets - Weighted-average Amortization Periods Remaining (Details)	12 Months Ended
	Dec. 31, 2019
Developed Technology Rights [Member]
Finite-lived intangible assets, remaining amortization period (Year)	3 years
Customer Relationships [Member]
Finite-lived intangible assets, remaining amortization period (Year)	4 years
Trade Names [Member]
Finite-lived intangible assets, remaining amortization period (Year)	2 years
Patents [Member]
Finite-lived intangible assets, remaining amortization period (Year)	7 years 7 months 6 days
Computer Software, Intangible Asset [Member]
Finite-lived intangible assets, remaining amortization period (Year)	2 years 8 months 12 days

Note 7 - Leases (Details Textua

Note 7 - Leases (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2019
Operating Lease, Right-of-Use Asset	$ 33,576	$ 0
Lessee, Operating Lease, Renewal Term	5 years
Lessee, Operating Lease, Lease Not yet Commenced	$ 1,098
Operating Lease, Expense		$ 5,742	$ 6,865
Minimum [Member]
Lessee, Operating Lease, Remaining Term of Contract	1 year
Lessee, Operating Lease, Lease Not yet Commenced, Term of Contract	3 years
Maximum [Member]
Lessee, Operating Lease, Remaining Term of Contract	10 years
Lessee, Operating Lease, Lease Not yet Commenced, Term of Contract	5 years
Accounting Standards Update 2016-02 [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption				$ 0
Operating Lease, Right-of-Use Asset				10,670
Operating Lease, Liability, Total				$ 10,670

Note 7 - Leases - Lease Cost (D

Note 7 - Leases - Lease Cost (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)
Operating lease expense	$ 5,094
Cash paid for leases	4,585
Right of use assets obtained in exchange for lease obligations	$ 27,639
Weighted average remaining lease term (years) (Year)	8 years 6 months 7 days
Weighted average discount rate	3.90%

Note 7 - Leases - Future Minimu

Note 7 - Leases - Future Minimum Lease Payments Under Non-cancelable Operating Leases (Details) $ in Thousands	Dec. 31, 2019USD ($)
2020	$ 4,455
2021	6,174
2022	6,351
2023	6,266
2024	6,073
Thereafter	23,630
Total future minimum lease payments	52,949
Less: Imputed interest	8,006
Lease incentive recognized as offset to asset liability	1,324
Liabilities [Member]
Present value of lease obligations	$ 43,619

Note 7 - Leases - Future Mini_2

Note 7 - Leases - Future Minimum Lease Payments Under Non-cancelable Leases and Service Agreements ASC 840 (Details) $ in Thousands	Dec. 31, 2018USD ($)
2019	$ 4,588
2020	2,252
2021	1,883
2022	1,722
2023	1,615
2024 and thereafter	1,698
Total	$ 13,758

Note 8 - Convertible Debt (Deta

Note 8 - Convertible Debt (Details Textual) - Convertible Debt [Member] $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016USD ($)$ / shares$ / item	Dec. 31, 2015USD ($)$ / shares$ / item
Convertible Notes 2015 [Member]
Debt Instrument, Face Amount		$ 230,000
Debt Instrument, Interest Rate, Stated Percentage		1.125%
Debt Instrument, Convertible, Conversion Ratio		24.8988
Debt Instrument, Convertible, Conversion Price | $ / shares		$ 40.16
Capped Call, Aggregate Call Options Purchased, Percentage Related to Shares Underlying the Convertible Note		100.00%
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger		98.00%
Convertible Debt Holders in Default, Percent of Principal Amount		25.00%
Convertible Debt in Default, Percent Holders to Declare Due and Payable		100.00%
Convertible Debt in Bankruptcy, Insolvency, and Reorganization, Percent due and Payable		100.00%
Proceeds from Convertible Debt		$ 230,000
Convertible Debt, Total		175,974
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt		54,026
Debt Issuance Costs, Gross		6,359
Payments of Debt Issuance Costs		6,007
Unamortized Debt Issuance Expense		4,864
Debt Instrument, Convertible Equity Component Issuance Cost		$ 1,495
Derivative, Cap Price | $ / item		52.06
Payments for Call Options		$ 17,802
Convertible Notes 2015 [Member] | Conversion Circumstance 1 [Member]
Debt Instrument, Convertible, Threshold Trading Days		20
Debt Instrument, Convertible, Threshold Consecutive Trading Days		30
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger		130.00%
Convertible Notes 2015 [Member] | Conversion Circumstance 2 [Member]
Debt Instrument, Convertible, Threshold Trading Days		5
Debt Instrument, Convertible, Threshold Consecutive Trading Days		5
Convertible Notes 2016 [Member]
Debt Instrument, Face Amount	$ 287,500
Debt Instrument, Interest Rate, Stated Percentage	0.75%
Debt Instrument, Convertible, Conversion Ratio	17.7508
Debt Instrument, Convertible, Conversion Price | $ / shares	$ 56.34
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger	98.00%
Convertible Debt Holders in Default, Percent of Principal Amount	25.00%
Convertible Debt in Default, Percent Holders to Declare Due and Payable	100.00%
Convertible Debt in Bankruptcy, Insolvency, and Reorganization, Percent due and Payable	100.00%
Proceeds from Convertible Debt	$ 287,500
Convertible Debt, Total	216,775
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt	70,725
Debt Issuance Costs, Gross	5,798
Debt Instrument, Convertible Equity Component Issuance Cost	$ 1,891
Derivative, Cap Price | $ / item	73.03
Payments for Call Options	$ 22,540
Debt Instrument, Repurchase Price, Percentage of Principal Amount Repurchased	100.00%
Debt and Equity Issuance Costs, Net	$ 7,689
Convertible Notes 2016 [Member] | Conversion Circumstance 1 [Member]
Debt Instrument, Convertible, Threshold Trading Days	20
Debt Instrument, Convertible, Threshold Consecutive Trading Days	30
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger	130.00%
Convertible Notes 2016 [Member] | Conversion Circumstance 2 [Member]
Debt Instrument, Convertible, Threshold Trading Days	5
Debt Instrument, Convertible, Threshold Consecutive Trading Days	5

Note 8 - Convertible Debt - Car

Note 8 - Convertible Debt - Carry Amount of Long-term Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Principal	$ 517,500	$ 517,500
Unamortized debt discount	(38,105)	(64,222)
Unamortized debt issuance costs	(3,217)	(5,453)
Net carrying amount of long-term debt	476,178	447,825
Less current portion of long-term debt	217,467	0
Long-term debt, non-current portion	$ 258,711	$ 447,825

Note 8 - Convertible Debt - Sch

Note 8 - Convertible Debt - Schedule of Interest Expense for Convertible Debt (Details) - Convertible Debt [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Convertible Notes 2015 [Member]
Contractual interest expense	$ 2,586	$ 2,587	$ 2,588
Amortization of debt discount	11,645	10,833	10,079
Amortization of debt issuance costs	1,050	976	907
Total interest expense	15,281	14,396	13,574
Convertible Notes 2016 [Member]
Contractual interest expense	2,152	2,156	2,154
Amortization of debt discount	14,472	13,481	12,559
Amortization of debt issuance costs	1,186	1,104	1,029
Total interest expense	$ 17,810	$ 16,741	$ 15,742

Note 9 - Other Liabilities - Ot

Note 9 - Other Liabilities - Other Current Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Software license intangible asset liability	$ 25,810	$ 21,945
Others	5,176	2,374
	33,531	24,319
Other Current Liabilities [Member]
Operating lease liability	$ 2,545	$ 0

Note 9 - Other Liabilities - _2

Note 9 - Other Liabilities - Other Long-term Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred rent	$ 26	$ 1,100
Income tax payable	692	706
Software license intangible asset liability	36,144	7,961
Others	981	1,144
	78,917	10,911
Other Noncurrent Liabilities [Member]
Operating lease liability	$ 41,074	$ 0

Note 10 - Income Taxes (Details

Note 10 - Income Taxes (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent		21.00%	21.00%	34.00%
Effective Income Tax Rate Reconciliation, at Highest Federal Statutory Income Tax Rate, Percent				35.00%
Tax Cuts and Jobs Act, Transition Tax for Accumulated Foreign Earnings, Liability, Total		$ 0
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount		$ 31,674	$ 13,777	$ 39,907
Earnings Per Share, Tax Holiday Effect		$ (0.04)	$ (0.05)	$ 0.18
Unrecognized Tax Benefits that Would Impact Effective Tax Rate		$ 5,478
Decrease in Unrecognized Tax Benefits is Reasonably Possible		58
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense, Total		16	$ 17	$ 16
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total		56	65	113
Undistributed Earnings of Foreign Subsidiaries		31,008
Domestic Tax Authority [Member]
Operating Loss Carryforwards, Total		261,621
Tax Credit Carryforward, Amount		57,078
Domestic Tax Authority [Member] | Cortina Systems Inc. [Member]
Operating Loss Carryforwards, Total		49,152
Domestic Tax Authority [Member] | ClariPhy Communications Inc.[Member]
Operating Loss Carryforwards, Total		46,601
Domestic Tax Authority [Member] | Research Tax Credit Carryforward [Member] | Cortina Systems Inc. [Member]
Tax Credit Carryforward, Amount		6,033
Domestic Tax Authority [Member] | Tax Year 2018 [Member]
Operating Loss Carryforwards, Total		59,407
State and Local Jurisdiction [Member]
Operating Loss Carryforwards, Total		96,559
Tax Credit Carryforward, Amount		58,288
State and Local Jurisdiction [Member] | Cortina Systems Inc. [Member]
Operating Loss Carryforwards, Total		3,919
State and Local Jurisdiction [Member] | ClariPhy Communications Inc.[Member]
Operating Loss Carryforwards, Total		68,104
State and Local Jurisdiction [Member] | Research Tax Credit Carryforward [Member] | Cortina Systems Inc. [Member]
Tax Credit Carryforward, Amount		7,912
Foreign Tax Authority [Member]
Increase (Decrease) in Income Taxes		(1,729)	(2,093)	7,412
Foreign Tax Authority [Member] | Tax Authority, Taiwan [Member]
Operating Loss Carryforwards, Total		2,597
Foreign Tax Authority [Member] | Her Majesty's Revenue and Customs (HMRC) [Member]
Operating Loss Carryforwards, Total		8,409
Foreign Tax Authority [Member] | Canada Revenue Agency [Member]
Tax Credit Carryforward, Amount		6,999
Foreign Tax Authority [Member] | Canada Revenue Agency [Member] | Research Tax Credit Carryforward [Member]
Tax Credit Carryforward, Amount		$ 3,750
Foreign Tax Authority [Member] | Inland Revenue, Singapore (IRAS) [Member]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent		17.00%
Effective Income Tax Rate Reconciliation, Tax Holiday, Percent		5.00%
Open Tax Year		2010 2011 2012
Foreign Tax Authority [Member] | Administracion Federal de Ingresos Publicos (AFIP) [Member]
Effective Income Tax Rate Reconciliation, Tax Holiday, Percent		12.00%
Foreign Tax Authority [Member] | Administracion Federal de Ingresos Publicos (AFIP) [Member] | Forecast [Member]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	30.00%
Increase to Income Tax Provision [Member]
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount		$ 31,917	13,757	39,931
Decrease to Other Comprehensive Income [Member]
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount		$ 243
Increase to Other Comprehensive Income [Member]
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount			$ 20	134
Decrease to Goodwill [Member]
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount				$ 158

Note 10 - Income Taxes - Income

Note 10 - Income Taxes - Income Before Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
United States	$ (60,313)	$ (71,978)	$ (77,649)
Foreign	(12,202)	(31,984)	(18,431)
Loss before income taxes	$ (72,515)	$ (103,962)	$ (96,080)

Note 10 - Income Taxes - Compon

Note 10 - Income Taxes - Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current:
U.S. Federal	$ 0	$ 0	$ 96
U.S. State	(11)	42	51
Foreign	70	375	1,105
Total current income tax expense	59	417	1,252
Deferred:
U.S. Federal	0	(6,734)	(11,312)
U.S. State	0	0	(613)
Foreign	337	(1,894)	(10,503)
Total deferred income tax expense	337	(8,628)	(22,428)
Total	$ 396	$ (8,211)	$ (21,176)

Note 10 - Income Taxes - Effect

Note 10 - Income Taxes - Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Benefit at statutory rate	$ (15,228)	$ (21,832)	$ (32,562)
State income taxes	(587)	594	(585)
Research and development credits	(16,933)	(13,283)	(12,983)
Change in valuation allowance	31,917	13,757	40,028
Impact of foreign operations	(1,045)	5,925	(1,951)
Unrecognized tax benefits	6,725	5,340	3,596
Stock-based compensation	(4,731)	(381)	(10,248)
Prior year return to provision adjustment	(1,167)	1,422	1,105
Section 162(m)	1,046	0	0
Effect of U. S. tax law change	0	0	(4,602)
Impairment of intangibles	0	0	(2,328)
Other	399	247	(646)
Total	$ 396	$ (8,211)	$ (21,176)

Note 10 - Income Taxes - Comp_2

Note 10 - Income Taxes - Components of Company's Net Deferred Taxes (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets
Net operating loss carry forwards	$ 48,481	$ 39,888
Research and development credits	84,268	69,320
Stock-based compensation	8,884	9,055
Accrued expenses and allowances	1,897	2,334
Amortization and depreciation	0	1,408
Operating lease liability	7,345	0
Other temporary differences	6,884	6,411
Foreign tax credit	2,338	2,338
Valuation allowance	(123,989)	(92,315)
Total deferred tax assets	36,108	38,439
Deferred tax liabilities
Acquired intangible assets	(16,092)	(22,593)
Convertible debt	(6,444)	(11,596)
Amortization and depreciation	(2,123)	0
Right of use asset	(6,806)	0
Other deferred tax liabilities	(1,482)	(603)
Total deferred tax liabilities	(32,947)	(34,792)
Deferred tax assets, net	$ 3,161	$ 3,647

Note 10 - Income Taxes - Summar

Note 10 - Income Taxes - Summary of Changes in Gross Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Balance	$ 53,943	$ 47,606	$ 56,503
Increases based on tax positions related to the current year	7,926	5,747	4,656
decreases based on tax positions of prior year	(518)		(13,452)
Increases based on tax positions of prior year		708
Statute of limitation expirations	(51)	(118)	(101)
Balance	$ 61,300	$ 53,943	$ 47,606

Note 11 - Earnings Per Share -

Note 11 - Earnings Per Share - Securities Not Included in Computation of Earnings Per Share (Details) - shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Anti-dilutive securities (in shares)	14,635,514	14,909,816	15,222,148
Share-based Payment Arrangement, Option [Member]
Anti-dilutive securities (in shares)	1,032,485	1,208,643	1,456,610
Restricted Stock Units (RSUs) [Member]
Anti-dilutive securities (in shares)	2,772,991	2,871,135	2,935,500
Convertible Debt Securities [Member]
Anti-dilutive securities (in shares)	10,830,038	10,830,038	10,830,038

Note 12 - Stock-based Compens_3

Note 12 - Stock-based Compensation (Details Textual) - USD ($) $ in Thousands	1 Months Ended		12 Months Ended
	Jan. 31, 2018	Dec. 31, 2011	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Common Stock, Capital Shares Reserved for Future Issuance			4,909,665
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross			0	0	0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value			$ 12,008	$ 4,553	$ 11,312
Proceeds from Stock Options Exercised			$ 2,616	$ 719	$ 2,214
Stock Issued During Period, Shares, Employee Stock Purchase Plans			208,721	283,493	171,099
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total			$ 125,015
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition			2 years 6 months
Employee Stock Purchase Plan [Member]
Maximum Percentage of Aggregate Cash Compensation for Purchase of Stock Using Payroll Deduction		15.00%
Purchase Price PerShare as Percentage of Market Value		85.00%
Percentage of Combined Voting Power or Value of All Classes of Stock Not Eligible to Participate		5.00%
Fair Value of Common Stock in Calendar Year per Employee Not Eligible to Participate		$ 25
Maximum Aggregate Number of Shares of Common Stock Available for Purchase under Employee Stock Purchase Plan			2,750,000
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period			4 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period			1,811,511
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance			3,822,325	4,051,685
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period			1,965,231
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period			4 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period			55,759
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance			72,053
Market Value Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	702,000
Market Value Stock Units, Performance Period	3 years
Market Value Stock Units [Member] | Minimum [Member]
Percentage of Target Number of Shares	0.00%
Market Value Stock Units [Member] | Maximum [Member]
Percentage of Target Number of Shares	225.00%

Note 12 - Stock-based Compens_4

Note 12 - Stock-based Compensation - Options Outstanding (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Number of shares outstanding (in shares)	1,159,121
Number of shares outstanding, weighted-average exercise price (in dollars per share)	$ 12.94
Number of shares outstanding, weighted-average remaining contractual life (Year)	1 year 9 months 21 days	2 years 7 months 13 days
Number of shares outstanding, aggregate intrinsic value	$ 54,616	$ 22,267
Number of shares exercised (in shares)	(253,980)
Number of shares exercised, weighted-average exercise price (in dollars per share)	$ 10.30
Number of shares outstanding (in shares)	905,141	1,159,121
Number of shares outstanding, weighted-average exercise price (in dollars per share)	$ 13.68	$ 12.94
Vested and expected to vest in the future (in shares)	905,141
Number of shares vested and expected to vest in the future, weighted-average exercise price (in dollars per share)	$ 13.68
Number of shares vested and expected to vest in the future, weighted-average remaining contractual life (Year)	1 year 9 months 21 days
Number of shares vested and expected to vest in the future, aggregate intrinsic value	$ 54,616

Note 12 - Stock-based Compens_5

Note 12 - Stock-based Compensation - Outstanding Restricted Stock Units (Details) - Restricted Stock Units (RSUs) [Member]	12 Months Ended
	Dec. 31, 2019$ / sharesshares
Outstanding (in shares)	4,051,685
Outstanding, weighted-average grant date fair value (in dollars per share) | $ / shares	$ 34.68
Granted (in shares)	1,965,231
Granted, weighted-average grant date fair value (in dollars per share) | $ / shares	$ 47.85
Vested (in shares)	(1,811,511)
Vested, weighted-average grant date fair value (in dollars per share) | $ / shares	$ 34.19
Canceled (in shares)	(383,080)
Canceled, weighted-average grant date fair value (in dollars per share) | $ / shares	$ 37.71
Outstanding (in shares)	3,822,325
Outstanding, weighted-average grant date fair value (in dollars per share) | $ / shares	$ 41.38
Expected to vest (in shares)	3,742,887

Note 12 - Stock-based Compens_6

Note 12 - Stock-based Compensation - Assumptions Valuation for Market Value Stock Units (Details) - Market Value Stock Units [Member] $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)$ / sharesshares
Total target shares (in shares) | shares	312,000
Fair value per share (in dollars per share) | $ / shares	$ 55.81
Total amount to be recognized over the service period | $	$ 17,413
Risk free interest rate	2.29%
Expected volatility	47.52%
Dividend yield	0.00%

Note 12 - Stock-based Compens_7

Note 12 - Stock-based Compensation - Fair Value of Employee Stock Purchase Plan (Details) - Employee Stock Purchase Plan [Member] - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Risk-free interest rate	2.26%	2.01%	0.94%
Expected life (Year)	5 months 26 days	6 months	6 months
Dividend yield	0.00%	0.00%	0.00%
Expected volatility	43.00%	46.00%	42.00%
Estimated fair value (in dollars per share)	$ 13.35	$ 8.35	$ 11.03

Note 12 - Stock-based Compens_8

Note 12 - Stock-based Compensation - Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Stock-based compensation expense	$ 76,855	$ 63,884	$ 44,833
Cost of Sales [Member]
Stock-based compensation expense	6,208	2,527	2,045
Research and Development Expense [Member]
Stock-based compensation expense	42,265	37,397	28,846
Selling and Marketing Expense [Member]
Stock-based compensation expense	15,561	13,470	8,340
General and Administrative Expense [Member]
Stock-based compensation expense	$ 12,821	$ 10,490	$ 5,602

Note 13 - Employee Benefit Pl_2

Note 13 - Employee Benefit Plan (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Contribution Plan, Employer Discretionary Contribution Amount	$ 1,976	$ 1,800	$ 1,137

Note 14 - Fair Value Measurem_3

Note 14 - Fair Value Measurements (Details Textual) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Convertible Debt, Fair Value Disclosures	$ 845,296	$ 512,428

Note 14 - Fair Value Measurem_4

Note 14 - Fair Value Measurements - Assets and Liabilities Carried at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Total fair value of assets	$ 341,444	$ 332,838
Fair Value, Inputs, Level 1 [Member]
Total fair value of assets	71,325	994
Fair Value, Inputs, Level 2 [Member]
Total fair value of assets	270,119	331,844
Money Market Funds [Member]
Cash equivalents	190,598	740
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Cash equivalents	67,494	38
Money Market Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Cash equivalents	123,104	702
Commercial Paper [Member]
Cash equivalents	9,465	96,759
Investment in marketable securities	6,464	39,701
Commercial Paper [Member] | Fair Value, Inputs, Level 1 [Member]
Cash equivalents	0	0
Investment in marketable securities	0	0
Commercial Paper [Member] | Fair Value, Inputs, Level 2 [Member]
Cash equivalents	9,465	96,759
Investment in marketable securities	6,464	39,701
Municipal Bonds [Member]
Cash equivalents	1,250
Investment in marketable securities	6,119	6,733
Municipal Bonds [Member] | Fair Value, Inputs, Level 1 [Member]
Cash equivalents	0
Investment in marketable securities	0	0
Municipal Bonds [Member] | Fair Value, Inputs, Level 2 [Member]
Cash equivalents	1,250
Investment in marketable securities	6,119	6,733
US Treasury Securities [Member]
Investment in marketable securities	3,759
US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Investment in marketable securities	3,759
US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Investment in marketable securities	0
Corporate Debt Securities [Member]
Investment in marketable securities	119,449	146,126
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Investment in marketable securities	0	0
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Investment in marketable securities	119,449	146,126
Variable Rate Demand Note [Member]
Investment in marketable securities		8,900
Variable Rate Demand Note [Member] | Fair Value, Inputs, Level 1 [Member]
Investment in marketable securities		0
Variable Rate Demand Note [Member] | Fair Value, Inputs, Level 2 [Member]
Investment in marketable securities		8,900
Asset-backed Securities [Member]
Investment in marketable securities	4,268	32,923
Asset-backed Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Investment in marketable securities	0	0
Asset-backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Investment in marketable securities	4,268	32,923
Certificates of Deposit [Member]
Investment in marketable securities	72	956
Certificates of Deposit [Member] | Fair Value, Inputs, Level 1 [Member]
Investment in marketable securities	72	956
Certificates of Deposit [Member] | Fair Value, Inputs, Level 2 [Member]
Investment in marketable securities	$ 0	$ 0

Note 15 - Segment and Geograp_3

Note 15 - Segment and Geographic Information (Details Textual) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)
Number of Operating Segments	1
Non-US [Member]
Long-Lived Assets	$ 33,826	$ 32,631
TAIWAN, PROVINCE OF CHINA
Long-Lived Assets	$ 27,750	$ 28,428

Note 15 - Segment and Geograp_4

Note 15 - Segment and Geographic Information - Revenue by Geographic Region (Details) - USD ($) $ in Thousands	3 Months Ended										12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	[1]	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	[2]	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenue	$ 102,896	$ 94,231	$ 86,285	$ 82,223	$ 86,531		$ 78,009	$ 69,814	$ 60,136		$ 365,635	$ 294,490	$ 348,201
CHINA
Revenue											164,715	113,684	114,168
UNITED STATES
Revenue											103,402	87,545	92,620
THAILAND
Revenue											54,468	40,884	45,205
Other Country [Member]
Revenue											$ 43,050	$ 52,377	$ 96,208
[1]	The Company recorded a charge of $7,000 due to impairment of a non-marketable equity investment.
[2]	The benefit for income taxes included partial release of federal valuation allowance resulting from the transfer of an acquired in-process research and development to developed technology in 2018 which allowed the related deferred tax liability to be considered a source of income for realizing deferred tax assets, as well as the revaluation of the foreign deferred tax liability on the in-process research and development based on the foreign tax rates applicable to the anticipated reversal periods.

Note 16 - Commitments and Con_3

Note 16 - Commitments and Contingencies (Details Textual) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Value of Open Purchase Orders	$ 14,977
Indemnification Agreement [Member]
Loss Contingency Accrual, Ending Balance	0	$ 0
Mask [Member]
Purchase Obligation, Total	$ 542

Note 16 - Commitments and Con_4

Note 16 - Commitments and Contingencies - Future Minimum Payments Under Non-cancelable Service Agreements (Details) $ in Thousands	Dec. 31, 2019USD ($)
2020	$ 1,508
2021	1,110
2022	515
2023	264
2024	195
	$ 3,592

Note 17 - Subsequent Event (Det

Note 17 - Subsequent Event (Details Textual) - Subsequent Event [Member] - USD ($)	1 Months Ended
	Feb. 25, 2020	Jan. 31, 2020
Restricted Stock Units (RSUs) and Market Value Stock Units (MVSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	1,247,109
eSilicon [Member]
Payments to Acquire Businesses, Gross		$ 215,000
Business Combination, Maximum Period Consideration Will be Held in Escrow Fund		12 months
Business Combination, Maximum Period Consideration Will Be Held in Escrow Fund in Connection with Recovering under the Buyer-side Representation and Warranty Insurance Policy		36 months

Note 18 - Supplementary Finan_3

Note 18 - Supplementary Financial Information (Unaudited) (Details Textual) $ in Millions	3 Months Ended
	Dec. 31, 2018USD ($)
Equity Method Investment, Other than Temporary Impairment	$ 7

Note 18 - Supplementary Finan_4

Note 18 - Supplementary Financial Information (Unaudited) - Quarterly Results of Operations (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended										12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	[1]	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	[2]	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenue from Contract with Customer, Excluding Assessed Tax, Total	$ 102,896	$ 94,231	$ 86,285	$ 82,223	$ 86,531		$ 78,009	$ 69,814	$ 60,136		$ 365,635	$ 294,490	$ 348,201
Gross profit	61,599	54,482	49,109	47,631	49,526		43,462	39,611	32,546		212,821	165,145	196,503
Net loss	$ (13,408)	$ (16,180)	$ (20,578)	$ (22,745)	$ (21,631)		$ (22,665)	$ (28,464)	$ (22,991)		$ (72,911)	$ (95,751)	$ (74,904)
Basic earnings per share (in dollars per share)	$ (0.29)	$ (0.36)	$ (0.46)	$ (0.51)	$ (0.49)		$ (0.52)	$ (0.65)	$ (0.53)		$ (1.61)	$ (2.19)	$ (1.78)
Diluted earnings per share (in dollars per share)	$ (0.29)	$ (0.36)	$ (0.46)	$ (0.51)	$ (0.49)		$ (0.52)	$ (0.65)	$ (0.53)		$ (1.61)	$ (2.19)	$ (1.78)
[1]	The Company recorded a charge of $7,000 due to impairment of a non-marketable equity investment.
[2]	The benefit for income taxes included partial release of federal valuation allowance resulting from the transfer of an acquired in-process research and development to developed technology in 2018 which allowed the related deferred tax liability to be considered a source of income for realizing deferred tax assets, as well as the revaluation of the foreign deferred tax liability on the in-process research and development based on the foreign tax rates applicable to the anticipated reversal periods.