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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2019
Income Taxes |
Schedule of United States and foreign loss before income taxes | United States and foreign (loss) income before income taxes was as follows (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year ended December 31, |
​ | ​ | 2019 | ​ | 2018 | ​ | 2017 |
United States |  | $ | (50,339) |  | $ | (14,776) |  | $ | 12,543 | ​
Foreign | ​ |  | 303 | ​ |  | 2,408 | ​ |  | (12,542) | ​
Total | ​ | $ | (50,036) | ​ | $ | (12,368) | ​ | $ | 1 | ​
Schedule of the provision for income taxes | The income tax (benefit) provision was as follows (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, |
​ | ​ | 2019 | ​ | 2018 | ​ | 2017 |
Current: |  | ​ |  |  | ​ |  |  | ​ |  | ​
Federal | ​ | $ | 237 | ​ | $ | — | ​ | $ | 235 | ​
State | ​ |  | 122 | ​ |  | 274 | ​ |  | 93 | ​
Foreign | ​ |  | 487 | ​ |  | 309 | ​ |  | — | ​
​ | ​ |  | 846 | ​ |  | 583 | ​ |  | 328 | ​
Deferred: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Federal | ​ |  | (58,368) | ​ |  | — | ​ |  | (235) | ​
State | ​ |  | (7,938) | ​ |  | — | ​ |  | — | ​
Foreign | ​ |  | — | ​ |  | — | ​ |  | — | ​
​ | ​ |  | (66,306) | ​ |  | — | ​ |  | (235) | ​
Income tax (benefit) provision | ​ | $ | (65,460) | ​ | $ | 583 | ​ | $ | 93 | ​
Schedule of reconciliations of the U.S. federal statutory tax rate to the combined effective tax rate | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year ended |
​ | ​ | December 31, |
(amounts in thousands) | ​ | 2019 | ​ | 2018 | ​ | 2017 |
Statutory rate of tax benefit | $ | (10,508) | $ | (2,597) | $ | - | ​
State income taxes, net of federal benefit |  | (2,418) | ​ | (1,518) | ​ | (17) | ​
Permanent and other items |  | 4,371 | ​ | 1,349 | ​ | 279 | ​
Stock-based compensation |  | (5,006) | ​ | (6,007) | ​ | (5,478) | ​
Research credits |  | (3,594) | ​ | (2,556) | ​ | (2,215) | ​
Uncertain tax positions |  | 1,780 | ​ | 6,143 | ​ | 1,108 | ​
Change in tax rate |  | 419 | ​ | (250) | ​ | 1,013 | ​
Tax Cuts and Jobs Act | ​ | - | ​ | - | ​ | 25,216 | ​
ASU 2016-09 Implementation & ASC 842 Adoption in 2019 | ​ | (104) | ​ | - | ​ | - | ​
Valuation allowance |  | (50,400) | ​ | 6,019 | ​ | (19,813) | ​
Income tax (benefit) provision | $ | (65,460) | $ | 583 | $ | 93 | ​
Schedule of significant components of the Company's deferred tax assets | Significant components of the Company’s net deferred tax assets at December 31, 2019 and December 31, 2018 are as follows (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, |
​ | ​ | 2019 | ​ | 2018 |
Deferred tax assets: |  |  |  |  | ​ |  | ​
Net operating loss carryforwards |  | $ | 69,571 | ​ | $ | 40,041 | ​
Tax credits | ​ | ​ | 11,590 | ​ |  | 7,754 | ​
Depreciation and amortization | ​ | ​ | — | ​ |  | 9,356 | ​
Stock-based compensation | ​ | ​ | 19,268 | ​ | ​ | 9,838 | ​
Reserves and accruals | ​ | ​ | 7,996 | ​ | ​ | 5,030 | ​
Lease liability | ​ | ​ | 18,422 | ​ | ​ | — | ​
Other, net | ​ | ​ | 147 | ​ | $ | (65) | ​
Total deferred tax assets | ​ | ​ | 126,994 | ​ |  | 71,954 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Deferred tax liabilities: | ​ | ​ | ​ | ​ | ​ | ​ | ​
Depreciation and amortization | ​ | ​ | (81,174) | ​ | ​ | — | ​
ROU Lease Asset | ​ | ​ | (17,333) | ​ | ​ | — | ​
Inventory | ​ | ​ | (6,030) | ​ | ​ | — | ​
Total deferred tax liabilities | ​ | $ | (104,537) | ​ | ​ | — | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Valuation allowance | ​ |  | (32,089) | ​ |  | (71,954) | ​
Net deferred tax liability | ​ | $ | (9,632) | ​ | $ | — | ​
Schedule of reconciliation of the beginning and ending amount of gross unrecognized tax benefits, excluding interest and penalties | A reconciliation of the beginning and ending amount of gross unrecognized tax benefits for the years ended December 31, 2019, December 31, 2018 and December 31, 2017, excluding interest and penalties, is as follows (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ | ​ | 2019 | ​ | 2018 | ​ | 2017
Balance at beginning of the year |  | $ | 13,486 |  | $ | 7,227 |  | $ | 5,947
Net addition for tax positions - prior years | ​ | ​ | 230 | ​ | ​ | 4,558 | ​ | ​ | —
Net additions for tax positions - current year | ​ | ​ | 2,339 | ​ |  | 1,701 | ​ |  | 1,280
Subtractions from tax positions - prior years | ​ | ​ | (537) | ​ | ​ | — | ​ | ​ | —
Subtractions from tax positions - current year | ​ | ​ | (442) | ​ | ​ | — | ​ | ​ | —
Balance at end of the year | ​ | $ | 15,076 | ​ | $ | 13,486 | ​ | $ | 7,227

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