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INCOME TAXES (Tables) | 12 Months Ended
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Dec. 31, 2021
Income Tax Disclosure [Abstract] |
Schedule of Income (Loss) Before Income Tax Provision |
Income (loss) before income tax: | Year ended December 31,
(in thousands) | 2021 |  | 2020 |  | 2019
Domestic | $ | (5,688) |  |  | $ | (42,905) |  |  | $ | 1,769 |
Foreign | 14,559 |  |  | 16,688 |  |  | (8,365) |
Income (loss) before income taxes | $ | 8,871 |  |  | $ | (26,217) |  |  | $ | (6,596) |
Schedule of Provision for Income Taxes |
Provision for (benefit from) income taxes: | Year ended December 31,
(in thousands) | 2021 |  | 2020 |  | 2019
Current: |  |  |  |  |
Federal | $ | 4 |  |  | $ | 124 |  |  | $ | (180) |
State | 85 |  |  | 93 |  |  | 108 |
Foreign | 2,469 |  |  | 2,103 |  |  | 1,525 |
Deferred: |  |  |  |  |
Foreign | (6,941) |  |  | 734 |  |  | (2,125) |
Total provision for (benefit from) income taxes | $ | (4,383) |  |  | $ | 3,054 |  |  | $ | (672) |
Schedule of Reconciliation of Provision for Income Taxes | The difference between the tax provision at the statutory federal income tax rate and the provision for (benefit from) income tax as a percentage of income (loss) before income taxes (effective tax rate) for each period was as follows:
| Year ended December 31,
| 2021 |  | 2020 |  | 2019
Statutory U.S. federal income tax rate | 21 | % |  | 21 | % |  | 21 | %
Increase (reduction) in rate resulting from: |  |  |  |  |
Differential in rates on foreign earnings | 42 | % |  | (11) | % |  | (37) | %
Change in valuation allowance | (113) | % |  | (16) | % |  | 14 | %
Change in liabilities for uncertain tax positions | (2) | % |  | — | % |  | 6 | %
Non-deductible stock-based compensation | 11 | % |  | (2) | % |  | (8) | %
Permanent differences | — | % |  | (2) | % |  | 11 | %
Adjustments related to tax positions taken during prior years | (3) | % |  | — | % |  | 6 | %
Research and development credits | (10) | % |  | — | % |  | — | %
Other | 3 | % |  | (2) | % |  | (3) | %
Effective tax rate | (49) | % |  | (12) | % |  | 10 | %
Schedule of Components of Deferred Tax Assets and Liabilities | The components of deferred taxes are as follows:
| As of December 31,
(in thousands) | 2021 |  | 2020
Deferred tax assets: |  |  |
Reserves and accruals | $ | 24,833 |  |  | $ | 21,823 |
Net operating loss carryforwards | 33,070 |  |  | 39,733 |
Research and development credit carryforwards | 39,730 |  |  | 38,179 |
Deferred stock-based compensation | 1,354 |  |  | 1,202 |
Intangibles | 7,321 |  |  | 7,838 |
Operating lease liabilities | 8,697 |  |  | 7,822 |
Capitalized research and development expenses | 9,681 |  |  | 10,805 |
Other | 31 |  |  | 442 |
Gross deferred tax assets | 124,717 |  |  | 127,844 |
Valuation allowance | (90,247) |  |  | (99,585) |
Gross deferred tax assets after valuation allowance | 34,470 |  |  | 28,259 |
Deferred tax liabilities: |  |  |
Depreciation | (6,597) |  |  | (6,399) |
Convertible notes | (3,652) |  |  | (4,708) |
Operating lease right-of-use assets | (7,402) |  |  | (6,529) |
Other | — |  |  | — |
Gross deferred tax liabilities | (17,651) |  |  | (17,636) |
Net deferred tax assets | $ | 16,819 |  |  | $ | 10,623 |
Schedule of Activities Related to Valuation Allowance | The following table summarizes the activities related to the Company’s valuation allowance:
| Year ended December 31,
(in thousands) | 2021 |  | 2020 |  | 2019
Balance at beginning of period | $ | 99,585 |  |  | $ | 95,518 |  |  | $ | 77,144 |
Additions | 310 |  |  | 6,690 |  |  | 23,929 |
Deductions | (9,648) |  |  | (2,623) |  |  | (5,555) |
Balance at end of period | $ | 90,247 |  |  | $ | 99,585 |  |  | $ | 95,518 |
Schedule of Activities Related to Gross Unrecognized Tax Benefits | The following table summarizes the activities related to the Company’s gross unrecognized tax benefits:
| Year ended December 31,
(in millions) | 2021 |  | 2020 |  | 2019
Balance at beginning of period | $ | 17.6 |  |  | $ | 17.0 |  |  | $ | 18.0 |
Increase in balance related to tax positions taken during current year | 0.3 |  |  | 0.3 |  |  | 0.2 |
Decrease in balance as a result of a lapse of the applicable statutes of limitations | (0.2) |  |  | — |  |  | (0.1) |
Increase in balance related to tax positions taken during prior years | — |  |  | 0.3 |  |  | — |
Decrease in balance related to tax positions taken during prior years | (3.9) |  |  | — |  |  | (1.1) |
Balance at end of period | $ | 13.8 |  |  | $ | 17.6 |  |  | $ | 17.0 |

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