INPHI 10-Q 5 Aug 19 2019 Q2 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	6 Months Ended
	Jun. 30, 2019	Aug. 01, 2019
Document Information [Line Items]
Entity Central Index Key	0001160958
Entity Shell Company	false
Entity Registrant Name	INPHI CORP
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Period Focus	Q2
Document Fiscal Year Focus	2019
Entity Small Business	false
Entity Emerging Growth Company	false
Document Quarterly Report	true
Document Transition Report	false
Document Type	10-Q
Document Period End Date	Jun. 30, 2019
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
Trading Symbol	IPHI
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		45,416,197

Unaudited Condensed Consolidate

Unaudited Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 159,624	$ 172,018
Investments in marketable securities	253,910	235,339
Accounts receivable, net	67,008	61,271
Inventories	44,095	33,052
Prepaid expenses and other current assets	8,626	9,600
Total current assets	533,263	511,280
Property and equipment, net	71,635	70,740
Goodwill	104,502	104,502
Intangible assets, net	147,355	180,447
Right of use assets, net	8,960	0
Other assets, net	24,425	22,904
Total assets	890,140	889,873
Current liabilities:
Accounts payable	22,635	15,891
Deferred revenue	6,245	5,432
Accrued employee expenses	11,157	11,206
Other accrued expenses	7,700	7,595
Other current liabilities	21,571	24,319
Total current liabilities	69,308	64,443
Convertible debt	461,630	447,825
Other long-term liabilities	15,798	10,911
Total liabilities	546,736	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; 45,401,399 and 44,292,722 issued and outstanding at June 30, 2019 and December 31, 2018, respectively	46	44
Additional paid-in capital	555,082	536,157
Accumulated deficit	(213,219)	(169,896)
Accumulated other comprehensive income	1,495	389
Total stockholders’ equity	343,404	366,694
Total liabilities and stockholders’ equity	$ 890,140	$ 889,873

Unaudited Condensed Consolida_2

Unaudited Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - $ / shares	Jun. 30, 2019	Dec. 31, 2018
Preferred stock, par value (in dollars per share)	$ 1	$ 1
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)	$ 1	$ 1
Common stock, authorized (in shares)	500,000,000	500,000,000
Common stock, issued (in shares)	45,401,399	44,292,722
Common stock, outstanding (in shares)	45,401,399	44,292,722

Unaudited Condensed Consolida_3

Unaudited Condensed Consolidated Statements of Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenue	$ 86,285	$ 69,814	$ 168,508	$ 129,950
Cost of revenue	37,176	30,203	71,768	57,793
Gross profit	49,109	39,611	96,740	72,157
Operating expenses:
Research and development	44,705	42,804	89,104	85,742
Sales and marketing	11,154	10,311	23,033	21,653
General and administrative	7,480	8,415	14,313	14,633
Total operating expenses	63,339	61,530	126,450	122,028
Loss from operations	(14,230)	(21,919)	(29,710)	(49,871)
Interest expense	(8,552)	(7,953)	(16,975)	(15,668)
Other income, net	1,617	1,466	3,995	5,881
Loss before income taxes	(21,165)	(28,406)	(42,690)	(59,658)
Provision (benefit) for income taxes	(587)	58	633	(8,203)
Net loss	$ (20,578)	$ (28,464)	$ (43,323)	$ (51,455)
Earnings per share:
Basic earnings per share (in dollars per share)	$ (0.46)	$ (0.65)	$ (0.97)	$ (1.19)
Diluted earnings per share (in dollars per share)	$ (0.46)	$ (0.65)	$ (0.97)	$ (1.19)
Weighted-average shares used in computing earnings per share:
Basic (in shares)	45,191,674	43,661,325	44,823,562	43,331,906
Diluted (in shares)	45,191,674	43,661,325	44,823,562	43,331,906

Unaudited Condensed Consolida_4

Unaudited Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Net loss	$ (20,578)	$ (28,464)	$ (43,323)	$ (51,455)
Other comprehensive income (loss):
Change in unrealized gain or loss, net of tax	566	137	1,106	(135)
Realized loss (gain) reclassified into earnings, net of tax	0	1	0	(1)
Comprehensive loss	$ (20,012)	$ (28,326)	$ (42,217)	$ (51,591)

Unaudited Condensed Consolida_5

Unaudited Condensed 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, 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)	136,690
Issuance of common stock from exercise of stock options	$ 0	291	0	0	291
Issuance of common stock from restricted stock unit grant, net of shares withheld for tax (in shares)	102,702
Issuance of common stock from restricted stock unit grant, net of shares withheld for tax	$ 0		0	0
Issuance of common stock from restricted stock unit grant, net of shares withheld for tax		(1,923)			(1,923)
Issuance of common stock from employee stock purchase plan purchases (in shares)	177,771
Issuance of common stock from employee stock purchase plan purchases	$ 0	3,704	0	0	3,704
Stock-based compensation expense	0	14,553	0	0	14,553
Net income (loss)	0	0	(22,991)	0	(22,991)
Other comprehensive income, net	$ 0	0	0	(275)	(275)
Balance (in shares) at Mar. 31, 2018	43,197,392
Balance at Mar. 31, 2018	$ 43	501,559	(97,136)	294	404,760
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 employee stock purchase plan purchases (in shares)					177,771
Net income (loss)					$ (51,455)
Balance (in shares) at Jun. 30, 2018	43,814,343
Balance at Jun. 30, 2018	$ 44	507,575	(125,600)	433	382,452
Balance (in shares) at Mar. 31, 2018	43,197,392
Balance at Mar. 31, 2018	$ 43	501,559	(97,136)	294	404,760
Issuance of common stock from exercise of stock options (in shares)	21,614
Issuance of common stock from exercise of stock options	$ 0	198	0	0	198
Issuance of common stock from restricted stock unit grant, net of shares withheld for tax (in shares)	595,337
Issuance of common stock from restricted stock unit grant, net of shares withheld for tax	$ 1		0	0
Issuance of common stock from restricted stock unit grant, net of shares withheld for tax		(10,398)			(10,397)
Stock-based compensation expense	0	16,216	0	0	16,216
Net income (loss)	0	0	(28,464)	0	(28,464)
Other comprehensive income, net	$ 0	0	0	139	139
Balance (in shares) at Jun. 30, 2018	43,814,343
Balance at Jun. 30, 2018	$ 44	507,575	(125,600)	433	382,452
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)	78,205
Issuance of common stock from exercise of stock options	$ 0	646	0	0	646
Issuance of common stock from restricted stock unit grant, net of shares withheld for tax (in shares)	168,227
Issuance of common stock from restricted stock unit grant, net of shares withheld for tax	$ 1		0	0
Issuance of common stock from restricted stock unit grant, net of shares withheld for tax		(4,017)			(4,016)
Issuance of common stock from employee stock purchase plan purchases (in shares)	121,549
Issuance of common stock from employee stock purchase plan purchases	$ 0	3,477	0	0	3,477
Stock-based compensation expense	0	18,758	0	0	18,758
Net income (loss)	0	0	(22,745)	0	(22,745)
Other comprehensive income, net	$ 0	0	0	540	540
Balance (in shares) at Mar. 31, 2019	44,660,703
Balance at Mar. 31, 2019	$ 45	555,021	(192,641)	929	363,354
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)					123,522
Issuance of common stock from employee stock purchase plan purchases (in shares)					121,549
Net income (loss)					$ (43,323)
Balance (in shares) at Jun. 30, 2019	45,401,399
Balance at Jun. 30, 2019	$ 46	555,082	(213,219)	1,495	343,404
Balance (in shares) at Mar. 31, 2019	44,660,703
Balance at Mar. 31, 2019	$ 45	555,021	(192,641)	929	363,354
Issuance of common stock from exercise of stock options (in shares)	45,317
Issuance of common stock from exercise of stock options	$ 0	486	0	0	486
Issuance of common stock from restricted stock unit grant, net of shares withheld for tax (in shares)	695,379
Issuance of common stock from restricted stock unit grant, net of shares withheld for tax	$ 1		0	0
Issuance of common stock from restricted stock unit grant, net of shares withheld for tax		(18,386)			(18,385)
Stock-based compensation expense	0	17,961	0	0	17,961
Net income (loss)	0	0	(20,578)	0	(20,578)
Other comprehensive income, net	$ 0	0	0	566	566
Balance (in shares) at Jun. 30, 2019	45,401,399
Balance at Jun. 30, 2019	$ 46	$ 555,082	$ (213,219)	$ 1,495	$ 343,404

Unaudited Condensed Consolida_6

Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash flows from operating activities
Net loss	$ (43,323)	$ (51,455)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	48,518	37,445
Stock-based compensation	36,719	30,769
Deferred income taxes	446	(8,598)
Accretion of convertible debt and amortization of debt issuance costs	13,805	12,853
Net unrealized (gain) loss on equity investments	75	(2,857)
Amortization of discount on marketable securities	(516)	(190)
Other noncash items	302	373
Changes in assets and liabilities:
Accounts receivable	(5,737)	13,906
Inventories	(11,043)	(2,128)
Prepaid expenses and other assets	(469)	(4,160)
Income tax payable/receivable	126	(1,420)
Accounts payable	7,130	316
Accrued expenses	194	(6,408)
Deferred revenue	813	(118)
Other liabilities	2,362	7,784
Net cash provided by operating activities	49,402	26,112
Cash flows from investing activities
Purchases of property and equipment	(12,610)	(17,718)
Purchases of marketable securities	(141,764)	(124,826)
Sales of marketable securities	15,029	3,681
Maturities of marketable securities	109,352	134,155
Payments related to purchase of intangible assets	(13,608)	(11,259)
Purchases of equity investments	0	(12,811)
Proceeds from sale of equity investment	0	2,414
Other investing activity	0	125
Net cash used in investing activities	(43,601)	(26,239)
Cash flows from financing activities
Proceeds from exercise of stock options	1,132	489
Proceeds from employee stock purchase plan purchases	3,477	3,704
Payment of obligations related to equipment financing	(238)	(296)
Repayment of long-term loan	0	216
Minimum tax withholding paid on behalf of employees for net share settlement	(22,566)	(12,294)
Net cash used in financing activities	(18,195)	(8,181)
Net decrease in cash and cash equivalents	(12,394)	(8,308)
Cash and cash equivalents at beginning of period	172,018	163,450
Cash and cash equivalents at end of period	159,624	155,142
Supplemental cash flow information:
Interest paid	3,196	2,837
Income taxes paid	126	1,808
Supplemental disclosure of non-cash investing and financing activities:
Software license intangible assets acquired	$ 2,433	$ 18,468

Note 1 - Organization and Basis

Note 1 - Organization and Basis of Presentation	6 Months Ended
	Jun. 30, 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 interim unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States (“GAAP”) for interim financial information and in accordance with the instructions to Form 10 10 01 X. not December 31, 2018, 10 February 28, 2019. The interim condensed consolidated financial statements included herein are unaudited; however, they contain all normal recurring accruals and adjustments that, in the opinion of management, are necessary to state fairly the Company’s consolidated financial position as of June 30, 2019, three six June 30, 2019 2018, six June 30, 2019 2018. three six June 30, 2019, not

Note 2 - Recent Accounting Pron

Note 2 - Recent Accounting Pronouncements	6 Months Ended
	Jun. 30, 2019
Notes to Financial Statements
New Accounting Pronouncements and Changes in Accounting Principles [Text Block]	2. In February 2016, the Financial Accounting Standards Board (“FASB”) issued guidance that requires companies that lease assets (lessees) to recognize on the balance sheet the assets and liabilities for the rights and obligations created by leases with lease terms of more than 12 months. The FASB also issued additional updates. For leases less than twelve months, an entity is permitted to make an accounting policy election by class of underlying asset not to recognize lease assets and lease liabilities. If a lessee makes this election, it should recognize lease expense for such leases generally on a straight-line basis over the lease term. The guidance requires entities to recognize and measure leases at the beginning of the earliest period presented using a modified retrospective approach or allows entities to initially apply the new lease standard at the adoption date and recognize a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. The Company adopted this guidance on January 1, 2019. See note 7 to the condensed consolidated financial statements for further details. In June 2016, the FASB issued guidance which requires entities to estimate an expected lifetime credit loss on certain financial assets. This guidance is effective for the annual and interim periods of the Company beginning after December 15, 2019, with early adoption permitted. The Company is currently evaluating the impact that this new guidance will have on its consolidated financial statements and related disclosures. In January 2017, the FASB issued guidance to simplify the measurement of goodwill by eliminating the Step 2 impairment test. Step 2 measures a goodwill impairment loss by comparing the implied fair value of a reporting unit’s goodwill with the carrying amount of that goodwill. The new guidance requires an entity to compare the fair value of a reporting unit with its carrying amount and recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value. Additionally, an entity should consider income tax effects from any tax deductible goodwill on the carrying amount of the reporting unit when measuring the goodwill impairment loss, if applicable. The new guidance becomes effective for goodwill impairment tests in fiscal years beginning after December 15, 2019, though early adoption is permitted. The Company adopted this guidance on January 1, 2019. The adoption of this standard did not have a material impact on the Company’s consolidated financial statements. In February 2018, the FASB issued guidance that allows an option to reclassify from accumulated other comprehensive income to retained earnings any stranded tax effects resulting from the Tax Cuts and Jobs Act. The guidance is effective for fiscal years beginning after December 15, 2018. The Company adopted this guidance on January 1, 2019. The adoption of this standard did not have a material impact on the Company’s consolidated financial statements. In June 2018, the FASB issued guidance to eliminate the separate guidance applicable to share-based payments to nonemployees. Under the new guidance, equity-classified share-based payment awards issued to nonemployees will be measured on the grant date, instead of being remeasured through the performance completion date (generally the vesting date), as required under the current guidance. The new guidance will also require recognition of compensation cost for awards with performance conditions when achievement of those conditions are probable, rather than upon their achievement. Further, the new guidance will eliminate the requirement to reassess the classification of nonemployee awards under the financial instruments literature upon vesting. The guidance is effective for fiscal years beginning after December 15, 2018. The Company adopted this guidance on January 1, 2019. The adoption of this standard did not have a material impact on the Company’s consolidated financial statements. In August 2018, the FASB issued guidance that eliminates certain disclosure requirements for fair value measurements for all entities, requiring public entities to disclose certain new information and modifies some disclosure requirements. The new guidance will no longer require disclosure of the amount of and reasons for transfers between Level 1 and Level 2 of the fair value hierarchy, but will require disclosure of the range and weighted average used to develop significant unobservable inputs for Level 3 fair value measurements, with early adoption permitted. The guidance will be effective for fiscal years beginning after December 15, 2019. The Company is currently evaluating the impact that this new guidance will have on its consolidated financial statements and related disclosures. In August 2018, the FASB issued guidance requiring a customer in a cloud computing arrangement under a service contract to follow the internal use software guidance in Accounting Standards Codification (“ASC”) 350 - 40 to determine which implementation costs to capitalize as assets. Capitalized implementation costs are expensed over the term of the hosting arrangement beginning when the module or component of the hosting arrangement is ready for its intended use. The guidance will be effective for fiscal years beginning after December 15, 2019. The Company is currently evaluating the impact that this new guidance will have on its consolidated financial statements and related disclosures. In August 2018, the SEC adopted the final rule under SEC Release No. 33 - 10532, Disclosure Update and Simplification, amending certain disclosure requirements that were redundant, duplicative, overlapping, outdated or superseded. In addition, the amendments expanded the disclosure requirements on the analysis of stockholders' equity for interim financial statements. Under the amendments, an analysis of changes in each caption of stockholders' equity presented in the balance sheet must be provided in a note or separate statement. The analysis should present a reconciliation of the beginning balance to the ending balance of each period for which a statement of comprehensive income is required to be filed. This final rule became effective on November 5, 2018. The Company adopted the rule in the fourth quarter of 2018. The adoption on this standard requires the Company to present comparative consolidated statements of stockholders’ equity as part of the interim period financial statements. In November 2018, the FASB issued amendments to guidance on “Collaborative Arrangements” and “Revenue from Contracts with Customers”, that require transactions in collaborative arrangements to be accounted for under “Revenue from Contracts with Customers” if the counterparty is a customer for a good or service (or bundle of goods and services) that is a distinct unit of account. The amendments also preclude entities from presenting consideration from transactions with a collaborator that is not a customer together with revenue recognized from contracts with customers. The amendments to the guidance are effective for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years, though early adoption is permitted, including adoption in any interim period. The Company is currently evaluating the impact that this new guidance will have on its consolidated financial statements and related disclosures.

Note 3 - Investments

Note 3 - Investments	6 Months Ended
	Jun. 30, 2019
Notes to Financial Statements
Investment [Text Block]	3. The following table summarizes the investments in marketable securities by investment category: June 30, 2019 December 31, 2018 Cost Fair Value Cost Fair Value Available-for-sale securities: U.S. Treasury securities $ 1,970 1,971 $ — $ — Municipal bonds 7,655 7,693 6,751 6,733 Corporate notes/bonds 166,813 167,400 146,466 146,126 Variable rate demand notes 12,900 12,900 8,900 8,900 Asset backed securities 22,059 22,110 32,986 32,923 Commercial paper 41,228 41,240 39,707 39,701 Certificate of deposit 596 596 956 956 Total investments $ 253,221 $ 253,910 $ 235,766 $ 235,339 As of June 30, 2019, June 30, 2019 The contractual maturities of available-for-sale securities at June 30, 2019 Cost Fair Value Due in one year or less $ 138,924 $ 139,094 Due between one and five years 98,291 98,813 Due after five years 16,006 16,003 $ 253,221 $ 253,910 The Company has a marketable equity investment in a company located in Taiwan. The fair value of the investment and unrealized loss as of June 30, 2019 The Company has non-marketable equity investments in privately held companies without readily determinable market values. The Company adjusts the carrying value of non-marketable equity investments to fair value upon observable transactions for identical or similar investments of the same issuer or impairment (referred to as the measurement alternative). All gains and losses on non-marketable equity investments, realized and unrealized, are recognized in Other income, net. As of June 30, 2019, three March 31, 2018. three March 31, 2018.

Note 4 - Inventories

Note 4 - Inventories	6 Months Ended
	Jun. 30, 2019
Notes to Financial Statements
Inventory Disclosure [Text Block]	4. Inventories consist of the following: June 30, 2019 December 31, 2018 Raw materials $ 14,963 $ 12,435 Work in process 17,832 13,602 Finished goods 11,300 7,015 $ 44,095 $ 33,052

Note 5 - Property and Equipment

Note 5 - Property and Equipment, Net	6 Months Ended
	Jun. 30, 2019
Notes to Financial Statements
Property, Plant and Equipment Disclosure [Text Block]	5. Property and equipment consist of the following: June 30, 2019 December 31, 2018 Laboratory and production equipment $ 130,392 $ 121,716 Office, software and computer equipment 33,255 30,190 Furniture and fixtures 1,739 1,558 Leasehold improvements 7,623 7,609 173,009 161,073 Less accumulated depreciation and amortization (101,374 ) (90,333 ) $ 71,635 $ 70,740 Depreciation and amortization expense of property and equipment for the three six June 30, 2019 three six June 30, 2018 As of June 30, 2019 December 31, 2018, three six June 30, 2019, three six June 30, 2018, Property and equipment not June 30, 2019 December 31, 2018

Note 6 - Intangible Assets

Note 6 - Intangible Assets	6 Months Ended
	Jun. 30, 2019
Notes to Financial Statements
Goodwill and Intangible Assets Disclosure [Text Block]	6. The following table presents details of intangible assets: June 30, 2019 December 31, 2018 Gross Accumulated Amortization Net Gross Accumulated Amortization Net Developed technology $ 186,800 $ 105,826 $ 80,974 $ 186,800 $ 86,378 $ 100,422 Customer relationships 70,540 26,545 43,995 70,540 21,681 48,859 Trade name 2,310 1,581 729 2,310 1,350 960 Patents 1,579 948 631 1,579 881 698 Software 62,224 41,198 21,026 61,406 31,898 29,508 $ 323,453 $ 176,098 $ 147,355 $ 322,635 $ 142,188 $ 180,447 The following table presents amortization of intangible assets for the three six June 30, 2019 2018: Three Months Ended June 30, Six Months Ended June 30, 201 9 201 8 201 9 201 8 Cost of goods sold $ 9,724 $ 6,699 $ 19,448 $ 13,398 Research and development 5,514 4,524 10,916 9,079 Sales and marketing 2,432 2,432 4,864 4,864 General and administrative 148 152 298 308 $ 17,818 $ 13,807 $ 35,526 $ 27,649 Based on the amount of intangible assets subject to amortization at June 30, 2019, five 2019 (remaining) $ 33,733 2020 39,567 2021 33,410 2022 24,346 2023 15,460 Thereafter 839 $ 147,355 The weighted-average amortization periods remaining by intangible asset category were as follows (in years): Developed technology 3.3 Customer relationship 4.5 Trade name 2.3 Patents 7.8 Software 1.4

Note 7 - Leases

Note 7 - Leases	6 Months Ended
	Jun. 30, 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 condensed consolidated balance sheets. Finance leases are included in property and equipment, other current liabilities, and other long-term liabilities on the condensed consolidated balance sheets. As of the adoption date and June 30, 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 1 year to 7 years and some may Information related to operating leases for the three six June 30, 2019 Three Months Ended June 30, 2019 Six Months Ended June 30, 2019 Operating lease cost $ 1,044 $ 2,098 Cash paid for leases 927 2,191 Right of use assets obtained in exchange for lease obligations — 224 Weighted average remaining lease term and weighted average discount as of June 30, 2019 Weighted average remaining lease term (years) 4.45 Weighted average discount rate 3.5 % Future minimum lease payments under non-cancellable leases as of June 30, 2019 2019 (remaining) $ 635 2020 2,481 2021 2,278 2022 2,176 2023 2,098 Thereafter 2,071 Total future minimum lease payments 11,739 Less imputed interest 1,071 Present value of lease obligations $ 10,668 As of June 30, 2019, not second 2019 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 three six June 30, 2018,

Note 8 - Product Warranty Oblig

Note 8 - Product Warranty Obligation	6 Months Ended
	Jun. 30, 2019
Notes to Financial Statements
Product Warranty Disclosure [Text Block]	8. As of June 30, 2019 December 31, 2018, three six June 30, 2019 2018.

Note 9 - Convertible Debt

Note 9 - Convertible Debt	6 Months Ended
	Jun. 30, 2019
Convertible Debt [Member]
Notes to Financial Statements
Debt Disclosure [Text Block]	9. The carrying amount of the Company’s long-term debt consists of the following: June 30, 2019 December 31, 2018 Principal $ 517,500 $ 517,500 Less: Unamortized debt discount (51,505 ) (64,222 ) Unamortized debt issuance costs (4,365 ) (5,453 ) Net carrying amount of long-term debt 461,630 447,825 Less current portion of long-term debt — — Long-term debt, non-current portion $ 461,630 $ 447,825 In December 2015, 2020 2015” 2015 December 1, 2020, 2015 June 1 December 1 June 1, 2016. $1 2015, three June 30, 2019 six June 30, 2019 three June 30, 2018 six June 30, 2018 In connection with the issuance of the Convertible Notes 2015, 2015” 2015, 2015, 2015 In September 2016, 2021 2016”, 2015, 2016 September 1, 2021, 2016 March 1 September 1 March 1, 2017. $1 2016, three June 30, 2019 six June 30, 2019 three June 30, 2018 six June 30, 2018 In connection with the issuance of the Convertible Notes 2016, 2016” 2016, 2016, 2016

Note 10 - Other Liabilities

Note 10 - Other Liabilities	6 Months Ended
	Jun. 30, 2019
Notes to Financial Statements
Other Liabilities Disclosure [Text Block]	10. Other current liabilities consist of the following: June 30, 2019 December 31, 2018 Intangible asset liability $ 13,747 $ 21,945 Operating lease liability 1,652 — Others 6,172 2,374 $ 21,571 $ 24,319 Other long-term liabilities consist of the following: June 30, 2019 December 31, 2018 Deferred rent $ 36 $ 1,100 Income tax payable 742 706 Intangible asset liability 4,984 7,961 Operating lease liability 9,016 — Others 1,020 1,144 $ 15,798 $ 10,911

Note 11 - Income Taxes

Note 11 - Income Taxes	6 Months Ended
	Jun. 30, 2019
Notes to Financial Statements
Income Tax Disclosure [Text Block]	11. The Company normally determines its interim income tax provision using an estimated single annual effective tax rate for all tax jurisdictions. ASC 740 no three six June 30, 2019 2018 not June 30, 2019 2018 The Company recorded an income tax provision (benefit) of ($587) and $633 in the three six June 30, 2019, three six June 30, 2019, The Company recorded an income tax provision (benefit) of $58 and ($8,203) in the three six June 30, 2018, three six June 30, 2018 three June 30, 2018, six June 30, 2018, 2018 During the three six June 30, 2019, June 30, 2019, The Company does not

Note 12 - Earnings Per Share

Note 12 - Earnings Per Share	6 Months Ended
	Jun. 30, 2019
Notes to Financial Statements
Earnings Per Share [Text Block]	12. The following securities were not Three Months Ended June 30, Six Months Ended June 30, 201 9 201 8 201 9 201 8 Common stock options 1,056,682 1,197,891 1,092,153 1,237,305 Unvested restricted stock units and market value stock units 2,772,493 2,993,650 2,790,574 2,857,301 Convertible debt 10,830,038 10,830,038 10,830,038 10,830,038 14,659,213 15,021,579 14,712,765 14,924,644

Note 13 - Stock-based Compensat

Note 13 - Stock-based Compensation	6 Months Ended
	Jun. 30, 2019
Notes to Financial Statements
Share-based Payment Arrangement [Text Block]	13. In June 2010, 2010 “2010 November 2010. 2010 2010 2010 June 30, 2019, 2010 Stock Option Awards The Company did not grant any stock options during the three six June 30, 2019 2018. The following table summarizes information regarding options outstanding: Number of Weighted Weighted Aggregate Outstanding at December 31, 2018 1,159,121 $ 12.94 2.62 $ 22,267 Exercised (123,522 ) $ 9.17 Outstanding at June 30 , 2019 1,035,599 $ 13.39 2.19 $ 38,017 Vested and Exercisable at June 30 , 2019 1,035,599 $ 13.39 2.19 $ 38,017 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 six June 30, 2019 2018 six June 30, 2019 2018, Restricted Stock Units The Company granted restricted stock units (“RSUs”) to members of the Board and its employees. Most of the Company’s outstanding RSUs vest over 4 years with vesting contingent upon continuous service. The Company estimates the fair value of RSUs using the market price of the common stock on the date of the grant. The fair value of these awards is amortized on a straight-line basis over the vesting period. The following table summarizes information regarding outstanding RSUs: Number of Weighted Outstanding at December 31, 2018 4,051,685 $ 34.68 Granted 1,679,698 $ 45.35 Vested (1,352,508 ) $ 32.18 Canceled (309,831 ) $ 37.17 Outstanding at June 30, 2019 4,069,044 $ 39.72 Expected to vest at June 30 , 2019 3,933,669 The RSUs include performance-based stock units subject to achievement of pre-established revenue goal and earnings per share on a non-GAAP basis. Once the goals are met, the performance-based stock units are subject to 4 years of vesting from the original grant date, contingent upon continuous service. The total performance-based units that vested for the six June 30, 2019 June 30, 2019, 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 six June 30, 2019 2018 The fair value of the ESPP purchases is estimated at the start of the offering period using the Black-Scholes option pricing model with the following assumptions: Six Months Ended June 30, 2019 2018 Risk-free interest rate 2.50 % 1.79 % Expected life (in years) 0.49 0.49 Dividend yield — — Expected volatility 45 % 48 % Estimated fair value $ 11.11 $ 7.42 Stock-Based Compensation Expense Stock-based compensation expense is included in the Company’s condensed consolidated statements of income (loss) as follows: Three Months Ended June 30, Six Months Ended June 30, 201 9 201 8 201 9 201 8 Cost of goods sold $ 1,674 $ 605 $ 2,479 $ 1,174 Research and development 9,925 9,741 20,657 18,239 Sales and marketing 3,269 3,241 7,417 6,483 General and administrative 3,093 2,629 6,166 4,873 $ 17,961 $ 16,216 $ 36,719 $ 30,769 Total unrecognized compensation cost related to unvested restricted stock units at June 30, 2019,

Note 14 - Fair Value Measuremen

Note 14 - Fair Value Measurements	6 Months Ended
	Jun. 30, 2019
Notes to Financial Statements
Fair Value Disclosures [Text Block]	14. 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 condensed consolidated balance sheets at their original issuance value including accreted interest, net of unamortized debt discount and issuance cost. The Convertible Notes are not June 30, 2019 December 31, 2018, 2 June 30, 2019 December 31, 2018 The following table presents information about assets and liabilities required to be carried at fair value on a recurring basis: June 30, 2019 Total Level 1 Level 2 Assets Cash equivalents: Money market funds $ 1,328 $ 41 $ 1,287 Commercial paper 82,390 — 82,390 Investment in marketable debt securities: Municipal bonds 7,693 — 7,693 Corporate notes/bonds 167,400 — 167,400 Variable rate demand notes 12,900 — 12,900 Asset backed securities 22,110 — 22,110 Commercial paper 41,240 — 41,240 U.S. Treasury securities 1,971 1,971 — Certificate of deposit 596 596 — $ 337,628 $ 2,608 $ 335,020 December 31, 2018 Total Level 1 Level 2 Assets Cash equivalents: Money market funds $ 740 $ 38 $ 702 Commercial paper 96,759 — 96,759 Investment 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 3, 1 3, 3

Note 15 - Segment and Geographi

Note 15 - Segment and Geographic Information	6 Months Ended
	Jun. 30, 2019
Notes to Financial Statements
Segment Reporting Disclosure [Text Block]	15. The Company operates in one reportable segment. The Company’s Chief Executive Officer, who is considered to be the chief operating decision maker, manages the Company’s operations as a whole and reviews consolidated financial information for purposes of evaluating financial performance and allocating resources. Revenue by region is classified based on the locations to which the products are shipped, which may The following table sets forth the Company’s revenue by geographic region: Three Months Ended June 30, Six Months Ended June 30, 201 9 201 8 201 9 201 8 China $ 38,449 $ 25,304 $ 76,266 $ 38,987 United States 20,520 18,561 40,967 46,963 Thailand 14,225 12,895 26,844 16,120 Other 13,091 13,054 24,431 27,880 $ 86,285 $ 69,814 $ 168,508 $ 129,950 As of June 30, 2019, December 31, 2018,

Note 16 - Commitments and Conti

Note 16 - Commitments and Contingencies	6 Months Ended
	Jun. 30, 2019
Notes to Financial Statements
Commitments and Contingencies Disclosure [Text Block]	16. Noncancelable Purchase Obligations 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. June 30, 2019, 2019 (remaining) $ 893 2020 14,448 2021 13,869 2022 9,953 2023 7 Thereafter 3 Total $ 39,173 The Company depends upon third June 30, 2019, June 30, 2019, 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, inter partes 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 ClariPhy Certain customers of ClariPhy had made claims associated with matters occurring prior to the acquisition date, including a demand letter the Company received relating to products purchased by a customer from ClariPhy. A customer alleged that the products did not July 2019, Indemnifications In the ordinary course of business, the Company may not third may may not not June 30, 2019 December 31, 2018.

Significant Accounting Policies

Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2019
Accounting Policies [Abstract]
New Accounting Pronouncements, Policy [Policy Text Block]	In February 2016, the Financial Accounting Standards Board (“FASB”) issued guidance that requires companies that lease assets (lessees) to recognize on the balance sheet the assets and liabilities for the rights and obligations created by leases with lease terms of more than 12 months. The FASB also issued additional updates. For leases less than twelve months, an entity is permitted to make an accounting policy election by class of underlying asset not to recognize lease assets and lease liabilities. If a lessee makes this election, it should recognize lease expense for such leases generally on a straight-line basis over the lease term. The guidance requires entities to recognize and measure leases at the beginning of the earliest period presented using a modified retrospective approach or allows entities to initially apply the new lease standard at the adoption date and recognize a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. The Company adopted this guidance on January 1, 2019. See note 7 to the condensed consolidated financial statements for further details. In June 2016, the FASB issued guidance which requires entities to estimate an expected lifetime credit loss on certain financial assets. This guidance is effective for the annual and interim periods of the Company beginning after December 15, 2019, with early adoption permitted. The Company is currently evaluating the impact that this new guidance will have on its consolidated financial statements and related disclosures. In January 2017, the FASB issued guidance to simplify the measurement of goodwill by eliminating the Step 2 impairment test. Step 2 measures a goodwill impairment loss by comparing the implied fair value of a reporting unit’s goodwill with the carrying amount of that goodwill. The new guidance requires an entity to compare the fair value of a reporting unit with its carrying amount and recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value. Additionally, an entity should consider income tax effects from any tax deductible goodwill on the carrying amount of the reporting unit when measuring the goodwill impairment loss, if applicable. The new guidance becomes effective for goodwill impairment tests in fiscal years beginning after December 15, 2019, though early adoption is permitted. The Company adopted this guidance on January 1, 2019. The adoption of this standard did not have a material impact on the Company’s consolidated financial statements. In February 2018, the FASB issued guidance that allows an option to reclassify from accumulated other comprehensive income to retained earnings any stranded tax effects resulting from the Tax Cuts and Jobs Act. The guidance is effective for fiscal years beginning after December 15, 2018. The Company adopted this guidance on January 1, 2019. The adoption of this standard did not have a material impact on the Company’s consolidated financial statements. In June 2018, the FASB issued guidance to eliminate the separate guidance applicable to share-based payments to nonemployees. Under the new guidance, equity-classified share-based payment awards issued to nonemployees will be measured on the grant date, instead of being remeasured through the performance completion date (generally the vesting date), as required under the current guidance. The new guidance will also require recognition of compensation cost for awards with performance conditions when achievement of those conditions are probable, rather than upon their achievement. Further, the new guidance will eliminate the requirement to reassess the classification of nonemployee awards under the financial instruments literature upon vesting. The guidance is effective for fiscal years beginning after December 15, 2018. The Company adopted this guidance on January 1, 2019. The adoption of this standard did not have a material impact on the Company’s consolidated financial statements. In August 2018, the FASB issued guidance that eliminates certain disclosure requirements for fair value measurements for all entities, requiring public entities to disclose certain new information and modifies some disclosure requirements. The new guidance will no longer require disclosure of the amount of and reasons for transfers between Level 1 and Level 2 of the fair value hierarchy, but will require disclosure of the range and weighted average used to develop significant unobservable inputs for Level 3 fair value measurements, with early adoption permitted. The guidance will be effective for fiscal years beginning after December 15, 2019. The Company is currently evaluating the impact that this new guidance will have on its consolidated financial statements and related disclosures. In August 2018, the FASB issued guidance requiring a customer in a cloud computing arrangement under a service contract to follow the internal use software guidance in Accounting Standards Codification (“ASC”) 350 - 40 to determine which implementation costs to capitalize as assets. Capitalized implementation costs are expensed over the term of the hosting arrangement beginning when the module or component of the hosting arrangement is ready for its intended use. The guidance will be effective for fiscal years beginning after December 15, 2019. The Company is currently evaluating the impact that this new guidance will have on its consolidated financial statements and related disclosures. In August 2018, the SEC adopted the final rule under SEC Release No. 33 - 10532, Disclosure Update and Simplification, amending certain disclosure requirements that were redundant, duplicative, overlapping, outdated or superseded. In addition, the amendments expanded the disclosure requirements on the analysis of stockholders' equity for interim financial statements. Under the amendments, an analysis of changes in each caption of stockholders' equity presented in the balance sheet must be provided in a note or separate statement. The analysis should present a reconciliation of the beginning balance to the ending balance of each period for which a statement of comprehensive income is required to be filed. This final rule became effective on November 5, 2018. The Company adopted the rule in the fourth quarter of 2018. The adoption on this standard requires the Company to present comparative consolidated statements of stockholders’ equity as part of the interim period financial statements. In November 2018, the FASB issued amendments to guidance on “Collaborative Arrangements” and “Revenue from Contracts with Customers”, that require transactions in collaborative arrangements to be accounted for under “Revenue from Contracts with Customers” if the counterparty is a customer for a good or service (or bundle of goods and services) that is a distinct unit of account. The amendments also preclude entities from presenting consideration from transactions with a collaborator that is not a customer together with revenue recognized from contracts with customers. The amendments to the guidance are effective for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years, though early adoption is permitted, including adoption in any interim period. The Company is currently evaluating the impact that this new guidance will have on its consolidated financial statements and related disclosures.

Note 3 - Investments (Tables)

Note 3 - Investments (Tables)	6 Months Ended
	Jun. 30, 2019
Notes Tables
Available-for-sale Securities [Table Text Block]	June 30, 2019 December 31, 2018 Cost Fair Value Cost Fair Value Available-for-sale securities: U.S. Treasury securities $ 1,970 1,971 $ — $ — Municipal bonds 7,655 7,693 6,751 6,733 Corporate notes/bonds 166,813 167,400 146,466 146,126 Variable rate demand notes 12,900 12,900 8,900 8,900 Asset backed securities 22,059 22,110 32,986 32,923 Commercial paper 41,228 41,240 39,707 39,701 Certificate of deposit 596 596 956 956 Total investments $ 253,221 $ 253,910 $ 235,766 $ 235,339
Investments Classified by Contractual Maturity Date [Table Text Block]	Cost Fair Value Due in one year or less $ 138,924 $ 139,094 Due between one and five years 98,291 98,813 Due after five years 16,006 16,003 $ 253,221 $ 253,910

Note 4 - Inventories (Tables)

Note 4 - Inventories (Tables)	6 Months Ended
	Jun. 30, 2019
Notes Tables
Schedule of Inventory, Current [Table Text Block]	June 30, 2019 December 31, 2018 Raw materials $ 14,963 $ 12,435 Work in process 17,832 13,602 Finished goods 11,300 7,015 $ 44,095 $ 33,052

Note 5 - Property and Equipme_2

Note 5 - Property and Equipment, Net (Tables)	6 Months Ended
	Jun. 30, 2019
Notes Tables
Property, Plant and Equipment [Table Text Block]	June 30, 2019 December 31, 2018 Laboratory and production equipment $ 130,392 $ 121,716 Office, software and computer equipment 33,255 30,190 Furniture and fixtures 1,739 1,558 Leasehold improvements 7,623 7,609 173,009 161,073 Less accumulated depreciation and amortization (101,374 ) (90,333 ) $ 71,635 $ 70,740

Note 6 - Intangible Assets (Tab

Note 6 - Intangible Assets (Tables)	6 Months Ended
	Jun. 30, 2019
Notes Tables
Schedule of Finite-Lived Intangible Assets [Table Text Block]	June 30, 2019 December 31, 2018 Gross Accumulated Amortization Net Gross Accumulated Amortization Net Developed technology $ 186,800 $ 105,826 $ 80,974 $ 186,800 $ 86,378 $ 100,422 Customer relationships 70,540 26,545 43,995 70,540 21,681 48,859 Trade name 2,310 1,581 729 2,310 1,350 960 Patents 1,579 948 631 1,579 881 698 Software 62,224 41,198 21,026 61,406 31,898 29,508 $ 323,453 $ 176,098 $ 147,355 $ 322,635 $ 142,188 $ 180,447
Finite-lived Intangible Assets Amortization Expense [Table Text Block]	Three Months Ended June 30, Six Months Ended June 30, 201 9 201 8 201 9 201 8 Cost of goods sold $ 9,724 $ 6,699 $ 19,448 $ 13,398 Research and development 5,514 4,524 10,916 9,079 Sales and marketing 2,432 2,432 4,864 4,864 General and administrative 148 152 298 308 $ 17,818 $ 13,807 $ 35,526 $ 27,649
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]	2019 (remaining) $ 33,733 2020 39,567 2021 33,410 2022 24,346 2023 15,460 Thereafter 839 $ 147,355
Finite Lived Intangible Assets Remaining Amortization Period [Table Text Block]	Developed technology 3.3 Customer relationship 4.5 Trade name 2.3 Patents 7.8 Software 1.4

Note 7 - Leases (Tables)

Note 7 - Leases (Tables)	6 Months Ended
	Jun. 30, 2019
Notes Tables
Lease, Cost [Table Text Block]	Three Months Ended June 30, 2019 Six Months Ended June 30, 2019 Operating lease cost $ 1,044 $ 2,098 Cash paid for leases 927 2,191 Right of use assets obtained in exchange for lease obligations — 224 Weighted average remaining lease term (years) 4.45 Weighted average discount rate 3.5 %
Lessee, Operating Lease, Liability, Maturity [Table Text Block]	2019 (remaining) $ 635 2020 2,481 2021 2,278 2022 2,176 2023 2,098 Thereafter 2,071 Total future minimum lease payments 11,739 Less imputed interest 1,071 Present value of lease obligations $ 10,668
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 9 - Convertible Debt (Tabl

Note 9 - Convertible Debt (Tables)	6 Months Ended
	Jun. 30, 2019
Notes Tables
Schedule of Long-term Debt Instruments [Table Text Block]	June 30, 2019 December 31, 2018 Principal $ 517,500 $ 517,500 Less: Unamortized debt discount (51,505 ) (64,222 ) Unamortized debt issuance costs (4,365 ) (5,453 ) Net carrying amount of long-term debt 461,630 447,825 Less current portion of long-term debt — — Long-term debt, non-current portion $ 461,630 $ 447,825

Note 10 - Other Liabilities (Ta

Note 10 - Other Liabilities (Tables)	6 Months Ended
	Jun. 30, 2019
Notes Tables
Other Current Liabilities [Table Text Block]	June 30, 2019 December 31, 2018 Intangible asset liability $ 13,747 $ 21,945 Operating lease liability 1,652 — Others 6,172 2,374 $ 21,571 $ 24,319
Other Noncurrent Liabilities [Table Text Block]	June 30, 2019 December 31, 2018 Deferred rent $ 36 $ 1,100 Income tax payable 742 706 Intangible asset liability 4,984 7,961 Operating lease liability 9,016 — Others 1,020 1,144 $ 15,798 $ 10,911

Note 12 - Earnings Per Share (T

Note 12 - Earnings Per Share (Tables)	6 Months Ended
	Jun. 30, 2019
Notes Tables
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]	Three Months Ended June 30, Six Months Ended June 30, 201 9 201 8 201 9 201 8 Common stock options 1,056,682 1,197,891 1,092,153 1,237,305 Unvested restricted stock units and market value stock units 2,772,493 2,993,650 2,790,574 2,857,301 Convertible debt 10,830,038 10,830,038 10,830,038 10,830,038 14,659,213 15,021,579 14,712,765 14,924,644

Note 13 - Stock-based Compens_2

Note 13 - Stock-based Compensation (Tables)	6 Months Ended
	Jun. 30, 2019
Notes Tables
Share-based Payment Arrangement, Option, Activity [Table Text Block]	Number of Weighted Weighted Aggregate Outstanding at December 31, 2018 1,159,121 $ 12.94 2.62 $ 22,267 Exercised (123,522 ) $ 9.17 Outstanding at June 30 , 2019 1,035,599 $ 13.39 2.19 $ 38,017 Vested and Exercisable at June 30 , 2019 1,035,599 $ 13.39 2.19 $ 38,017
Share-based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block]	Number of Weighted Outstanding at December 31, 2018 4,051,685 $ 34.68 Granted 1,679,698 $ 45.35 Vested (1,352,508 ) $ 32.18 Canceled (309,831 ) $ 37.17 Outstanding at June 30, 2019 4,069,044 $ 39.72 Expected to vest at June 30 , 2019 3,933,669
Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions [Table Text Block]	Six Months Ended June 30, 2019 2018 Risk-free interest rate 2.50 % 1.79 % Expected life (in years) 0.49 0.49 Dividend yield — — Expected volatility 45 % 48 % Estimated fair value $ 11.11 $ 7.42
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]	Three Months Ended June 30, Six Months Ended June 30, 201 9 201 8 201 9 201 8 Cost of goods sold $ 1,674 $ 605 $ 2,479 $ 1,174 Research and development 9,925 9,741 20,657 18,239 Sales and marketing 3,269 3,241 7,417 6,483 General and administrative 3,093 2,629 6,166 4,873 $ 17,961 $ 16,216 $ 36,719 $ 30,769

Note 14 - Fair Value Measurem_2

Note 14 - Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 2019
Notes Tables
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]	June 30, 2019 Total Level 1 Level 2 Assets Cash equivalents: Money market funds $ 1,328 $ 41 $ 1,287 Commercial paper 82,390 — 82,390 Investment in marketable debt securities: Municipal bonds 7,693 — 7,693 Corporate notes/bonds 167,400 — 167,400 Variable rate demand notes 12,900 — 12,900 Asset backed securities 22,110 — 22,110 Commercial paper 41,240 — 41,240 U.S. Treasury securities 1,971 1,971 — Certificate of deposit 596 596 — $ 337,628 $ 2,608 $ 335,020 December 31, 2018 Total Level 1 Level 2 Assets Cash equivalents: Money market funds $ 740 $ 38 $ 702 Commercial paper 96,759 — 96,759 Investment 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)	6 Months Ended
	Jun. 30, 2019
Notes Tables
Revenue from External Customers by Geographic Areas [Table Text Block]	Three Months Ended June 30, Six Months Ended June 30, 201 9 201 8 201 9 201 8 China $ 38,449 $ 25,304 $ 76,266 $ 38,987 United States 20,520 18,561 40,967 46,963 Thailand 14,225 12,895 26,844 16,120 Other 13,091 13,054 24,431 27,880 $ 86,285 $ 69,814 $ 168,508 $ 129,950

Note 16 - Commitments and Con_2

Note 16 - Commitments and Contingencies (Tables)	6 Months Ended
	Jun. 30, 2019
Notes Tables
Unrecorded Unconditional Purchase Obligations Disclosure [Table Text Block]	2019 (remaining) $ 893 2020 14,448 2021 13,869 2022 9,953 2023 7 Thereafter 3 Total $ 39,173

Note 3 - Investments (Details T

Note 3 - Investments (Details Textual) $ in Thousands	3 Months Ended	6 Months Ended
	Mar. 31, 2018USD ($)	Jun. 30, 2019USD ($)
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions		21
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total		$ 23
Equity Securities, FV-NI		1,311
Equity Securities, FV-NI, Unrealized Loss		682
Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Annual Amount	$ 3,066
Other Noncurrent Assets [Member]
Equity Securities without Readily Determinable Fair Value, Amount		16,866
Other Noncurrent Assets [Member] | Equity Securities, Fair Value Based on Observable Transaction [Member]
Equity Securities without Readily Determinable Fair Value, Amount		$ 6,066

Note 3 - Investments - Summary

Note 3 - Investments - Summary of Investments by Investment Category (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Available-for-sale securities, amortized cost	$ 253,221	$ 235,766
Available-for-sale securities, fair value	253,910	235,339
US Treasury Securities [Member]
Available-for-sale securities, amortized cost	1,970	0
Available-for-sale securities, fair value	1,971	0
US States and Political Subdivisions Debt Securities [Member]
Available-for-sale securities, amortized cost	7,655	6,751
Available-for-sale securities, fair value	7,693	6,733
Corporate Debt Securities [Member]
Available-for-sale securities, amortized cost	166,813	146,466
Available-for-sale securities, fair value	167,400	146,126
Variable Rate Demand Note [Member]
Available-for-sale securities, amortized cost	12,900	8,900
Available-for-sale securities, fair value	12,900	8,900
Asset-backed Securities [Member]
Available-for-sale securities, amortized cost	22,059	32,986
Available-for-sale securities, fair value	22,110	32,923
Commercial Paper [Member]
Available-for-sale securities, amortized cost	41,228	39,707
Available-for-sale securities, fair value	41,240	39,701
Certificates of Deposit [Member]
Available-for-sale securities, amortized cost	596	956
Available-for-sale securities, fair value	$ 596	$ 956

Note 3 - Investments - Contract

Note 3 - Investments - Contractual Maturities of Available-for-sale Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Due in one year or less, cost	$ 138,924
Due in one year or less, fair value	139,094
Due between one and five years, cost	98,291
Due between one and five years, fair value	98,813
Due after five years, cost	16,006
Due after five years, fair value	16,003
Available-for-sale securities, cost	253,221	$ 235,766
Available-for-sale securities, fair value	$ 253,910	$ 235,339

Note 4 - Inventories - Schedule

Note 4 - Inventories - Schedule of Inventory (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Raw materials	$ 14,963	$ 12,435
Work in process	17,832	13,602
Finished goods	11,300	7,015
Total inventories	$ 44,095	$ 33,052

Note 5 - Property and Equipme_3

Note 5 - Property and Equipment, Net (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Depreciation, Total	$ 5,566	$ 4,753	$ 11,058	$ 9,796
Capitalized Computer Software, Gross	6,921		6,921		$ 6,879
Capitalized Computer Software, Amortization	$ 86	$ 159	186	$ 345
Capital Expenditures Incurred but Not yet Paid			$ 2,220		$ 2,580

Note 5 - Property and Equipme_4

Note 5 - Property and Equipment, Net - Property and Equipment Components (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Property and equipment, gross	$ 173,009	$ 161,073
Less accumulated depreciation and amortization	(101,374)	(90,333)
Total property and equipment	71,635	70,740
Equipment [Member]
Property and equipment, gross	130,392	121,716
Office, Software, and Computer Equipment [Member]
Property and equipment, gross	33,255	30,190
Furniture and Fixtures [Member]
Property and equipment, gross	1,739	1,558
Leasehold Improvements [Member]
Property and equipment, gross	$ 7,623	$ 7,609

Note 6 - Intangible Assets - Id

Note 6 - Intangible Assets - Identifiable Intangible Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Intangible assets, gross	$ 323,453	$ 322,635
Intangible assets, accumulated amortization	176,098	142,188
Intangible assets, net	147,355	180,447
Developed Technology Rights [Member]
Intangible assets, gross	186,800	186,800
Intangible assets, accumulated amortization	105,826	86,378
Intangible assets, net	80,974	100,422
Customer Relationships [Member]
Intangible assets, gross	70,540	70,540
Intangible assets, accumulated amortization	26,545	21,681
Intangible assets, net	43,995	48,859
Trade Names [Member]
Intangible assets, gross	2,310	2,310
Intangible assets, accumulated amortization	1,581	1,350
Intangible assets, net	729	960
Patents [Member]
Intangible assets, gross	1,579	1,579
Intangible assets, accumulated amortization	948	881
Intangible assets, net	631	698
Computer Software, Intangible Asset [Member]
Intangible assets, gross	62,224	61,406
Intangible assets, accumulated amortization	41,198	31,898
Intangible assets, net	$ 21,026	$ 29,508

Note 6 - Intangible Assets - Am

Note 6 - Intangible Assets - Amortization (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Amortization of intangible assets	$ 17,818	$ 13,807	$ 35,526	$ 27,649
Cost of Sales [Member]
Amortization of intangible assets	9,724	6,699	19,448	13,398
Research and Development Expense [Member]
Amortization of intangible assets	5,514	4,524	10,916	9,079
Selling and Marketing Expense [Member]
Amortization of intangible assets	2,432	2,432	4,864	4,864
General and Administrative Expense [Member]
Amortization of intangible assets	$ 148	$ 152	$ 298	$ 308

Note 6 - Intangible Assets - Ex

Note 6 - Intangible Assets - Expected Amortization Expense (Details) $ in Thousands	Jun. 30, 2019USD ($)
2019 (remaining)	$ 33,733
2020	39,567
2021	33,410
2022	24,346
2023	15,460
Thereafter	839
Total amortization expense	$ 147,355

Note 6 - Intangible Assets - We

Note 6 - Intangible Assets - Weighted-average Amortization Periods Remaining (Details)	6 Months Ended
	Jun. 30, 2019
Developed Technology Rights [Member]
Finite-lived intangible assets, remaining amortization period (Year)	3 years 3 months 18 days
Customer Relationships [Member]
Finite-lived intangible assets, remaining amortization period (Year)	4 years 6 months
Trade Names [Member]
Finite-lived intangible assets, remaining amortization period (Year)	2 years 3 months 18 days
Patents [Member]
Finite-lived intangible assets, remaining amortization period (Year)	7 years 9 months 18 days
Computer Software, Intangible Asset [Member]
Finite-lived intangible assets, remaining amortization period (Year)	1 year 4 months 24 days

Note 7 - Leases (Details Textua

Note 7 - Leases (Details Textual) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Jan. 01, 2019	Dec. 31, 2018
Operating Lease, Right-of-Use Asset		$ 8,960			$ 0
Lessee, Operating Lease, Renewal Term		5 years
Lessee, Operating Lease, Lease Not yet Commenced		$ 1,227
Lessee, Operating Lease, Lease Not yet Commenced, Term of Contract		5 years
Operating Lease, Expense	$ 1,708		$ 3,448
Operating Lease, Liability, Total		$ 10,668
Minimum [Member]
Lessee, Operating Lease, Remaining Term of Contract		1 year
Maximum [Member]
Lessee, Operating Lease, Remaining Term of Contract		7 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

Note 7 - Leases - Lease Cost (D

Note 7 - Leases - Lease Cost (Details) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019USD ($)	Jun. 30, 2019USD ($)
Operating lease cost	$ 1,044	$ 2,098
Cash paid for leases	927	2,191
Right of use assets obtained in exchange for lease obligations	$ 0	$ 224
Weighted average remaining lease term (years) (Year)	4 years 5 months 12 days	4 years 5 months 12 days
Weighted average discount rate	3.50%	3.50%

Note 7 - Leases - Future Minimu

Note 7 - Leases - Future Minimum Lease Payments Under Non-cancelable Operating Leases (Details) $ in Thousands	Jun. 30, 2019USD ($)
2019 (remaining)	$ 635
2020	2,481
2021	2,278
2022	2,176
2023	2,098
Thereafter	2,071
Total future minimum lease payments	11,739
Less imputed interest	1,071
Present value of lease obligations	$ 10,668

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 - Product Warranty Obl_2

Note 8 - Product Warranty Obligation (Details Textual) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Mar. 31, 2019
Standard and Extended Product Warranty Accrual, Ending Balance		$ 110
Standard and Extended Product Warranty Accrual, Period Increase (Decrease), Total	$ 0

Note 9 - Convertible Debt (Deta

Note 9 - Convertible Debt (Details Textual) - Convertible Debt [Member] $ in Thousands	1 Months Ended		3 Months Ended		6 Months Ended
	Sep. 30, 2016USD ($)$ / shares	Dec. 31, 2015USD ($)$ / shares	Jun. 30, 2019USD ($)	Jun. 30, 2018USD ($)	Jun. 30, 2019USD ($)	Jun. 30, 2018USD ($)
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
Interest Expense, Debt, Total			$ 3,782	$ 3,564	$ 7,463	$ 7,033
Interest Expense, Debt, Excluding Amortization			646	646	1,286	1,286
Amortization of Debt Discount (Premium)			2,877	2,677	5,667	5,272
Amortization of Debt Issuance Costs			259	241	510	475
Convertible Debt in Default, Percent Holders to Declare Due and Payable		100.00%
Derivative, Cap Price | $ / shares		52.06
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
Interest Expense, Debt, Total			4,403	4,138	8,694	8,172
Interest Expense, Debt, Excluding Amortization			533	533	1,066	1,066
Amortization of Debt Discount (Premium)			3,577	3,332	7,050	6,568
Amortization of Debt Issuance Costs			$ 293	$ 273	$ 578	$ 538
Convertible Debt in Default, Percent Holders to Declare Due and Payable	100.00%
Derivative, Cap Price | $ / shares	73.03

Note 9 - Convertible Debt - Car

Note 9 - Convertible Debt - Carry Amount of Long-term Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Principal	$ 517,500	$ 517,500
Unamortized debt discount	(51,505)	(64,222)
Unamortized debt issuance costs	(4,365)	(5,453)
Net carrying amount of long-term debt	461,630	447,825
Less current portion of long-term debt	0	0
Long-term debt, non-current portion	$ 461,630	$ 447,825

Note 10 - Other Liabilities - O

Note 10 - Other Liabilities - Other Current Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Intangible asset liability	$ 13,747	$ 21,945
Operating lease liability	1,652	0
Others	6,172	2,374
Other current liabilities	$ 21,571	$ 24,319

Note 10 - Other Liabilities -_2

Note 10 - Other Liabilities - Other Long-term Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Deferred rent	$ 36	$ 1,100
Income tax payable	742	706
Intangible asset liability	4,984	7,961
Operating lease liability	9,016	0
Others	1,020	1,144
Total other long-term liabilities	$ 15,798	$ 10,911

Note 11 - Income Taxes (Details

Note 11 - Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Tax Expense (Benefit), Total	$ (587)	$ 58	$ 633	$ (8,203)
Effective Income Tax Rate Reconciliation, Percent, Total	2.80%	(0.20%)	(1.50%)	13.70%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent			21.00%	21.00%
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions	$ 581		$ 4,382

Note 12 - Earnings Per Share -

Note 12 - Earnings Per Share - Securities Not Included in Computation of Earnings Per Share (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Anti-dilutive securities (in shares)	14,659,213	15,021,579	14,712,765	14,924,644
Share-based Payment Arrangement, Option [Member]
Anti-dilutive securities (in shares)	1,056,682	1,197,891	1,092,153	1,237,305
Restricted Stock and Market Value Stock Units [Member]
Anti-dilutive securities (in shares)	2,772,493	2,993,650	2,790,574	2,857,301
Convertible Debt Securities [Member]
Anti-dilutive securities (in shares)	10,830,038	10,830,038	10,830,038	10,830,038

Note 13 - Stock-based Compens_3

Note 13 - Stock-based Compensation (Details Textual) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended
	Dec. 31, 2011	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Common Stock, Capital Shares Reserved for Future Issuance		5,124,906		5,124,906
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross		0	0	0	0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value				$ 4,506	$ 3,711
Proceeds from Stock Options Exercised				$ 1,132	$ 489
Stock Issued During Period, Shares, Employee Stock Purchase Plans				121,549	177,771
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total		$ 148,962		$ 148,962
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition				2 years 7 months 20 days
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				1,352,508
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance		4,069,044		4,069,044		4,051,685
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				54,759
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance		73,053		73,053

Note 13 - Stock-based Compens_4

Note 13 - Stock-based Compensation - Options Outstanding (Details) $ / shares in Units, $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2019USD ($)$ / sharesshares	Dec. 31, 2018USD ($)$ / sharesshares
Number of shares outstanding (in shares) | shares	1,159,121
Number of shares outstanding, weighted-average exercise price (in dollars per share) | $ / shares	$ 12.94
Number of shares outstanding, weighted-average remaining contractual life (Year)	2 years 2 months 8 days	2 years 7 months 13 days
Number of shares outstanding, aggregate intrinsic value | $	$ 38,017	$ 22,267
Number of shares exercised (in shares) | shares	(123,522)
Number of shares exercised, weighted-average exercise price (in dollars per share) | $ / shares	$ 9.17
Number of shares outstanding (in shares) | shares	1,035,599	1,159,121
Number of shares outstanding, weighted-average exercise price (in dollars per share) | $ / shares	$ 13.39	$ 12.94
Vested and expected to vest in the future (in shares) | shares	1,035,599
Number of shares vested and expected to vest in the future, weighted-average exercise price (in dollars per share) | $ / shares	$ 13.39
Number of shares vested and expected to vest in the future, weighted-average remaining contractual life (Year)	2 years 2 months 8 days
Number of shares vested and expected to vest in the future, aggregate intrinsic value | $	$ 38,017

Note 13 - Stock-based Compens_5

Note 13 - Stock-based Compensation - Outstanding Restricted Stock Units (Details) - Restricted Stock Units (RSUs) [Member]	6 Months Ended
	Jun. 30, 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)	1,679,698
Granted, weighted-average grant date fair value (in dollars per share) | $ / shares	$ 45.35
Vested (in shares)	(1,352,508)
Vested, weighted-average grant date fair value (in dollars per share) | $ / shares	$ 32.18
Canceled (in shares)	(309,831)
Canceled, weighted-average grant date fair value (in dollars per share) | $ / shares	$ 37.17
Outstanding (in shares)	4,069,044
Outstanding, weighted-average grant date fair value (in dollars per share) | $ / shares	$ 39.72
Expected to vest (in shares)	3,933,669

Note 13 - Stock-based Compens_6

Note 13 - Stock-based Compensation - Fair Value of Employee Stock Purchase Plan (Details) - Employee Stock Purchase Plan [Member] - $ / shares	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Risk-free interest rate	2.50%	1.79%
Expected life (Year)	5 months 26 days	5 months 26 days
Dividend yield	0.00%	0.00%
Expected volatility	45.00%	48.00%
Estimated fair value (in dollars per share)	$ 11.11	$ 7.42

Note 13 - Stock-based Compens_7

Note 13 - Stock-based Compensation - Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Stock-based compensation expense	$ 17,961	$ 16,216	$ 36,719	$ 30,769
Cost of Sales [Member]
Stock-based compensation expense	1,674	605	2,479	1,174
Research and Development Expense [Member]
Stock-based compensation expense	9,925	9,741	20,657	18,239
Selling and Marketing Expense [Member]
Stock-based compensation expense	3,269	3,241	7,417	6,483
General and Administrative Expense [Member]
Stock-based compensation expense	$ 3,093	$ 2,629	$ 6,166	$ 4,873

Note 14 - Fair Value Measurem_3

Note 14 - Fair Value Measurements (Details Textual) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Convertible Debt, Fair Value Disclosures	$ 626,846	$ 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	Jun. 30, 2019	Dec. 31, 2018
Total fair value of assets	$ 337,628	$ 332,838
Fair Value, Inputs, Level 1 [Member]
Total fair value of assets	2,608	994
Fair Value, Inputs, Level 2 [Member]
Total fair value of assets	335,020	331,844
Money Market Funds [Member]
Cash equivalents	1,328	740
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Cash equivalents	41	38
Money Market Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Cash equivalents	1,287	702
Commercial Paper [Member]
Cash equivalents	82,390	96,759
Investment in marketable securities	41,240	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	82,390	96,759
Investment in marketable securities	41,240	39,701
Municipal Bonds [Member]
Investment in marketable securities	7,693	6,733
Municipal Bonds [Member] | Fair Value, Inputs, Level 1 [Member]
Investment in marketable securities	0	0
Municipal Bonds [Member] | Fair Value, Inputs, Level 2 [Member]
Investment in marketable securities	7,693	6,733
Corporate Debt Securities [Member]
Investment in marketable securities	167,400	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	167,400	146,126
Variable Rate Demand Note [Member]
Investment in marketable securities	12,900	8,900
Variable Rate Demand Note [Member] | Fair Value, Inputs, Level 1 [Member]
Investment in marketable securities	0	0
Variable Rate Demand Note [Member] | Fair Value, Inputs, Level 2 [Member]
Investment in marketable securities	12,900	8,900
Asset-backed Securities [Member]
Investment in marketable securities	22,110	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	22,110	32,923
US Treasury Securities [Member]
Investment in marketable securities	1,971
US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Investment in marketable securities	1,971
US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Investment in marketable securities	0
Certificates of Deposit [Member]
Investment in marketable securities	596	956
Certificates of Deposit [Member] | Fair Value, Inputs, Level 1 [Member]
Investment in marketable securities	596	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	6 Months Ended
	Jun. 30, 2019USD ($)	Dec. 31, 2018USD ($)
Number of Operating Segments	1
Non-US [Member]
Long-Lived Assets	$ 27,999	$ 32,631
TAIWAN, PROVINCE OF CHINA
Long-Lived Assets	$ 22,088	$ 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		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenue	$ 86,285	$ 69,814	$ 168,508	$ 129,950
CHINA
Revenue	38,449	25,304	76,266	38,987
UNITED STATES
Revenue	20,520	18,561	40,967	46,963
THAILAND
Revenue	14,225	12,895	26,844	16,120
Other Country [Member]
Revenue	$ 13,091	$ 13,054	$ 24,431	$ 27,880

Note 16 - Commitments and Con_3

Note 16 - Commitments and Contingencies (Details Textual) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Value of Open Purchase Orders	$ 24,522
Indemnification Agreement [Member]
Loss Contingency Accrual, Ending Balance	0	$ 0
Mask [Member]
Purchase Obligation, Total	$ 393

Note 16 - Commitments and Con_4

Note 16 - Commitments and Contingencies - Future Minimum Payments Under Non-cancelable Service Agreements (Details) $ in Thousands	Jun. 30, 2019USD ($)
2019 (remaining)	$ 893
2020	14,448
2021	13,869
2022	9,953
2023	7
Thereafter	3
Total	$ 39,173