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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2021
Income Tax Disclosure [Abstract] |
Schedule of Domestic and Foreign Components of Net Income (Loss) Before Income Tax Expense | The domestic and foreign components of net income (loss) before income tax expense were as follows (in thousands):
|  | Year Ended December 31, |
|  | 2021 |  |  | 2020 |  |  | 2019 |
Domestic |  | $ | (4,280 | ) |  | $ | 1,562 |  |  | $ | 1,743 |
Foreign |  |  | (95 | ) |  |  | (427 | ) |  |  | 14 |
Net income (loss) before income tax |  | $ | (4,375 | ) |  | $ | 1,135 |  |  | $ | 1,757 |
Schedule of Provision (Benefit) for Income Tax | The provision (benefit) for income tax consists of the following (in thousands):
|  | Year Ended December 31, |
​ |  | 2021 |  |  | 2020 |  |  | 2019 |
Current: |  |  |  |  |  |  |  |  |
Federal |  | $ | — |  |  | $ | — |  |  | $ | — |
State |  |  | — |  |  |  | — |  |  |  | — |
Foreign |  |  | 6 |  |  |  | (7 | ) |  |  | 7 |
Total |  |  | 6 |  |  |  | (7 | ) |  |  | 7 |
Deferred: |  |  |  |  |  |  |  |  |
Federal |  |  | — |  |  |  | — |  |  |  | — |
State |  |  | — |  |  |  | — |  |  |  | — |
Foreign |  |  | 50 |  |  |  | (83 | ) |  |  | (48 | )
Total |  |  | 50 |  |  |  | (83 | ) |  |  | (48 | )
Total income tax expense (benefit) |  | $ | 56 |  |  | $ | (90 | ) |  | $ | (41 | )
Schedule of Reconciliation of Statutory Federal Income Tax Rate to Income Tax Expense (Benefit) | A reconciliation of income taxes at the statutory federal income tax rate to income tax expense (benefit) included in the accompanying consolidated statements of operations is as follows (in thousands):
|  | December 31, |
|  | 2021 |  |  | 2020 |  |  | 2019 |
Income tax at statutory rate |  | $ | (919 | ) |  | $ | 240 |  |  | $ | 369 |
Change in valuation allowance |  |  | 1,288 |  |  |  | (165 | ) |  |  | (17 | )
State tax |  |  | (288 | ) |  |  | (37 | ) |  |  | (133 | )
Stock-based compensation |  |  | 62 |  |  |  | (11 | ) |  |  | (420 | )
Research and development credit |  |  | (160 | ) |  |  | (103 | ) |  |  | (82 | )
Foreign rate differential |  |  | 7 |  |  |  | (40 | ) |  |  | (43 | )
Other |  |  | 66 |  |  |  | 26 |  |  |  | 285 |
Total |  | $ | 56 |  |  | $ | (90 | ) |  | $ | (41 | )
Schedule of Company's Deferred Tax Assets and Liabilities | Temporary differences that gave rise to significant portions of the Company’s deferred tax assets and liabilities as of December 31, 2021 and 2020 were as follows (in thousands):
|  | Year Ended December 31, |
|  | 2021 |  |  | 2020 |
Deferred tax assets: |  |  |  |  |  |
Net operating losses |  | $ | 19,920 |  |  | $ | 20,265 |
Credits |  |  | 2,557 |  |  |  | 2,292 |
Accruals and reserves |  |  | 2,605 |  |  |  | 1,648 |
Deferred revenue and contract costs |  |  | 140 |  |  |  | 296 |
Gross deferred tax assets |  |  | 25,222 |  |  |  | 24,501 |
Valuation allowance |  |  | (24,955 | ) |  |  | (23,667 | )
Net deferred tax assets |  |  | 267 |  |  |  | 834 |
Deferred tax liabilities: |  |  |  |  |  |
Fixed assets and intangibles |  |  | (267 | ) |  |  | (785 | )
Total deferred tax assets (liabilities), net |  | $ | — |  |  | $ | 49 |
Schedule of Unrecognized Uncertain Tax Positions | A reconciliation of the beginning and ending amounts of unrecognized uncertain tax positions is as follows (in thousands):
Balance as of December 31, 2019 |  | $ | 772 |
Increases for current year tax positions |  |  | 70 |
Increases for prior year tax positions |  |  | 17 |
Balance as of December 31, 2020 |  |  | 859 |
Increases for current year tax positions |  |  | 87 |
Increases for prior year tax positions |  |  | 8 |
Balance as of December 31, 2021 |  | $ | 954 |

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