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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2018
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, |
|  | 2018 |  | 2017 |  | 2016 |
United States |  | $ | (14,776) |  | $ | 12,543 |  | $ | 12,214 |
Foreign |  |  | 2,408 |  |  | (12,542) |  |  | (7,649) |
Total |  | $ | (12,368) |  | $ | 1 |  | $ | 4,565 |
Schedule of the provision for income taxes | The provision for income taxes was as follows (in thousands):
|  | December 31, |
|  | 2018 |  | 2017 |  | 2016 |
Current: |  |  |  |  |  |  |  |  |  |
Federal |  | $ | — |  | $ | 235 |  | $ | (28) |
State |  |  | 274 |  |  | 93 |  |  | 71 |
Foreign |  |  | 309 |  |  | — |  |  | — |
|  |  | 583 |  |  | 328 |  |  | 43 |
Deferred: |  |  |  |  |  |  |  |  |  |
Federal |  |  | — |  |  | (235) |  |  | — |
State |  |  | — |  |  | — |  |  | — |
Foreign |  |  | — |  |  | — |  |  | — |
|  |  | — |  |  | (235) |  |  | — |
Provision for income taxes |  | $ | 583 |  | $ | 93 |  | $ | 43 |
Schedule of reconciliations of the U.S. federal statutory tax rate to the combined effective tax rate |
|  | Year ended |
|  | December 31, |
(amounts in thousands) |  | 2018 |  | 2017 |  | 2016 |
Statutory rate of tax expense | $ | (2,597) | $ | - | $ | 1,552 |
State income taxes, net of federal benefit |  | (1,518) |  | (17) |  | 530 |
Permanent and other items |  | (4,658) |  | (5,199) |  | 789 |
Nondeductible offering costs |  | - |  | - |  | 7 |
Research credits |  | (2,556) |  | (2,215) |  | (1,945) |
Uncertain tax positions |  | 6,143 |  | 1,108 |  | 940 |
Change in tax rate |  | (250) |  | 1,013 |  | 1,337 |
Tax Cuts and Jobs Act |  | - |  | 25,216 |  | - |
Valuation allowance |  | 6,019 |  | (19,813) |  | (3,167) |
Provision for income taxes | $ | 583 | $ | 93 | $ | 43 |
Schedule of significant components of the Company's deferred tax assets | Significant components of the Company’s net deferred tax assets at December 31, 2018 and December 31, 2017 are as follows (in thousands):
|  | December 31, |
|  | 2018 |  | 2017 |
Deferred tax assets: |  |  |  |  |  |  |
Net operating loss carryforwards |  | $ | 40,041 |  | $ | 37,571 |
Tax credits |  |  | 7,754 |  |  | 6,713 |
Depreciation and amortization |  |  | 9,356 |  |  | 10,765 |
Stock-based compensation |  |  | 9,838 |  |  | 7,184 |
Reserves and accruals |  |  | 5,030 |  |  | 3,739 |
Total deferred tax assets |  |  | 72,019 |  |  | 65,972 |
Deferred tax liabilities: |  |  |  |  |  |  |
Other, net |  | $ | (65) |  | $ | (42) |
Valuation allowance |  |  | (71,954) |  |  | (65,695) |
Net deferred tax assets |  | $ | — |  | $ | 235 |
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, 2018, December 31, 2017 and December 31, 2016, excluding interest and penalties, is as follows (in thousands):
|  | December 31,
|  | 2018 |  | 2017 |  | 2016
Balance at beginning of the year |  | $ | 7,227 |  | $ | 5,947 |  | $ | 4,848
Net addition (reduction) for tax positions—prior years |  |  | 4,558 |  |  | — |  |  | (49)
Net additions for tax positions—current year |  |  | 1,701 |  |  | 1,280 |  |  | 1,148
Balance at end of the year |  | $ | 13,486 |  | $ | 7,227 |  | $ | 5,947

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