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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2020
Income Tax Disclosure [Abstract] |
Schedule of Reconciliation of Federal Statutory Rate on Loss before Income Taxes and before Gain from Sale of Equity Method Investment Rate to Effective Income Tax Rate | The reconciliation of the federal statutory rate on the income (loss) before income taxes to the effective income tax rate for the years ended December 31 is as follows:
|  | 2020 |  |  | 2019 |  |  | 2018 |
Statutory federal tax rate |  |  | 21.0 | % |  |  | 21.0 | % |  |  | 21.0 | %
State income taxes, net of federal income tax benefit |  |  | (0.5 | ) |  |  | (8.1 | ) |  |  | 3.6 |
Increase (decrease) in valuation allowance |  |  | 41.2 |  |  |  | 2.2 |  |  |  | (9.1 | )
Permanent items |  |  | (48.7 | ) |  |  | (3.9 | ) |  |  | (5.9 | )
Tax credits |  |  | (11.2 | ) |  |  | (15.6 | ) |  |  | (5.5 | )
Provision vs. tax return differences |  |  | 0.7 |  |  |  | 9.0 |  |  |  | (1.7 | )
Foreign rate differential and deferred items |  |  | 0.1 |  |  |  | 0.6 |  |  |  | 0.7 |
Change in tax reserves |  |  | — |  |  |  | — |  |  |  | 0.1 |
Other |  |  | 0.3 |  |  |  | — |  |  |  | 0.1 |
|  |  | 2.9% |  |  |  | 5.2% |  |  |  | 3.3% |
Schedule of Domestic and Foreign Components of Income (Loss) Before Income Taxes and before the Gain from Sale of Equity Method Investment | For financial reporting purposes, income before income taxes for the years ended December 31 include the following components (in thousands):
|  | 2020 |  |  | 2019 |  |  | 2018 |
Domestic |  | $ | 17,688 |  |  | $ | 13,493 |  |  | $ | 31,455 |
Foreign |  |  | 773 |  |  |  | 1,394 |  |  |  | 1,478 |
|  | $ | 18,461 |  |  | $ | 14,887 |  |  | $ | 32,933 |
Schedule of Components of Provision (Benefit) for Income Taxes | Significant components of the provision (benefit) for income taxes for the years ended December 31 are as follows (in thousands):
|  | 2020 |  |  | 2019 |  |  | 2018 |
Current: |  |  |  |  |  |  |  |  |  |  |  |
Federal |  | $ | 215 |  |  | $ | — |  |  | $ | — |
State |  |  | 93 |  |  |  | 268 |  |  |  | 231 |
Foreign |  |  | 252 |  |  |  | 450 |  |  |  | 911 |
|  |  | 560 |  |  |  | 718 |  |  |  | 1,142 |
Deferred: |  |  |  |  |  |  |  |  |  |  |  |
Foreign |  |  | (21 | ) |  |  | 60 |  |  |  | (55 | )
|  |  | (21 | ) |  |  | 60 |  |  |  | (55 | )
|  | $ | 539 |  |  | $ | 778 |  |  | $ | 1,087 |
Schedule of Significant Components of Deferred Tax Assets and Liabilities | Significant components of the Company’s deferred tax assets and liabilities as of December 31 were as follows (in thousands):
|  | 2020 |  |  | 2019 |
Deferred tax assets: |  |  |  |  |  |  |  |
Research and development tax credit carryforwards |  | $ | 29,046 |  |  | $ | 27,607 |
Net operating loss carryforwards |  |  | 5,923 |  |  |  | 328 |
Inventory reserves |  |  | 2,282 |  |  |  | 1,522 |
Investment tax credit carryforwards |  |  | 1,927 |  |  |  | 2,102 |
Stock-based compensation |  |  | 1,796 |  |  |  | 1,587 |
Vacation accrual |  |  | 1,349 |  |  |  | 1,280 |
UNICAP |  |  | 1,336 |  |  |  | 351 |
Accrued payroll tax deferral |  |  | 764 |  |  |  | — |
Lease liabilities |  |  | 518 |  |  |  | 679 |
Other |  |  | 1,197 |  |  |  | 1,708 |
Total deferred tax assets |  |  | 46,138 |  |  |  | 37,164 |
Less: Valuation allowance for deferred tax assets |  |  | (37,856 | ) |  |  | (30,363 | )
Net deferred tax assets |  |  | 8,282 |  |  |  | 6,801 |
Deferred tax liabilities: |  |  |  |  |  |  |  |
Depreciation |  |  | (6,809 | ) |  |  | (5,296 | )
Prepaid expenses |  |  | (616 | ) |  |  | (552 | )
ROU assets |  |  | (490 | ) |  |  | (653 | )
Other |  |  | (141 | ) |  |  | (95 | )
Total deferred tax liabilities |  |  | (8,056 | ) |  |  | (6,596 | )
Net deferred tax assets (liabilities) |  | $ | 226 |  |  | $ | 205 |
Schedule of Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits | A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows (in thousands):
|  | 2020 |  |  | 2019 |  |  | 2018 |
Balance on January 1 |  | $ | 2,070 |  |  | $ | 1,462 |  |  | $ | 1,104 |
Additions based on tax positions related to the current year |  |  | 244 |  |  |  | 571 |  |  |  | 245 |
(Reductions) additions for tax positions of prior years |  |  | (13 | ) |  |  | 43 |  |  |  | 120 |
Lapse of statute |  |  | (4 | ) |  |  | (6 | ) |  |  | (7 | )
Balance on December 31 |  | $ | 2,297 |  |  | $ | 2,070 |  |  | $ | 1,462 |

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