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INCOME TAXES (Tables)
12 Months Ended
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)202120202019
Domestic$(5,688)$(42,905)$1,769 
Foreign14,559 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)202120202019
Current:
Federal$$124 $(180)
State85 93 108 
Foreign2,469 2,103 1,525 
Deferred:
Foreign(6,941)734 (2,125)
Total provision for (benefit from) income taxes$(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,
202120202019
Statutory U.S. federal income tax rate21 %21 %21 %
Increase (reduction) in rate resulting from:
Differential in rates on foreign earnings42 %(11)%(37)%
Change in valuation allowance(113)%(16)%14 %
Change in liabilities for uncertain tax positions(2)%— %%
Non-deductible stock-based compensation11 %(2)%(8)%
Permanent differences— %(2)%11 %
Adjustments related to tax positions taken during prior years(3)%— %%
Research and development credits(10)%— %— %
Other%(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)20212020
Deferred tax assets:
Reserves and accruals$24,833 $21,823 
Net operating loss carryforwards33,070 39,733 
Research and development credit carryforwards39,730 38,179 
Deferred stock-based compensation1,354 1,202 
Intangibles7,321 7,838 
Operating lease liabilities8,697 7,822 
Capitalized research and development expenses9,681 10,805 
Other31 442 
Gross deferred tax assets124,717 127,844 
Valuation allowance(90,247)(99,585)
Gross deferred tax assets after valuation allowance34,470 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)202120202019
Balance at beginning of period$99,585 $95,518 $77,144 
Additions310 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)202120202019
Balance at beginning of period$17.6 $17.0 $18.0 
   Increase in balance related to tax positions taken during current year0.3 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