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Income Taxes (Tables)
12 Months Ended
Dec. 31, 2020
Income Tax Disclosure [Abstract]  
Schedule of Income (Loss) Before Income Taxes
For the years ended December 31, 2020, 2019, and 2018, our loss before income taxes was comprised of the following (in thousands):

Year Ended December 31,
202020192018
Domestic$(25,463)$(32,091)$(30,663)
Foreign(7,131)(17,803)(18,549)
Total$(32,594)$(49,894)$(49,212)
Schedule of Components of Income Tax Expense (Benefit)
For the years ended December 31, 2020, 2019, and 2018, our income tax expense (benefit) was comprised of the following (in thousands):

Year Ended December 31,
202020192018
Current:
Federal$11 $$— 
State79 60 25 
Foreign977 1,091 432 
Total current expense1,067 1,154 457 
Deferred:
Federal— — — 
State— — — 
Foreign(184)(334)(218)
Total deferred benefit(184)(334)(218)
Total income tax expense$883 $820 $239 
Schedule of Reconciliation of Statutory to Effective Income Tax Rate
For the years ended December 31, 2020, 2019, and 2018, the provision for income taxes differs from the amount computed by applying the federal statutory income tax rates to our loss before the provision (benefit) for income taxes as follows:

Year Ended December 31,
202020192018
U.S. federal statutory tax rate21.0 %21.0 %21.0 %
State tax expense18.2 7.1 7.2 
Foreign rate differential(3.6)(5.1)(5.1)
Nondeductible expenses(0.6)(0.7)(0.7)
Equity compensation46.2 12.0 9.5 
Tax credits12.0 6.5 3.9 
Unrecognized tax benefits(2.2)(1.1)(0.8)
Other(1.1)(0.8)0.6 
Remeasurement of deferred taxes(1.7)(1.6)— 
Change in valuation allowance(90.9)(38.9)(36.0)
Total(2.7)%(1.6)%(0.4)%
Schedule of Deferred Tax Assets and Liabilities As of December 31, 2020 and 2019, significant components of our deferred tax assets and liabilities were as follows (in thousands):
As of December 31,
20202019
Deferred tax assets:
Net operating losses$59,417 $34,875 
Tax credits11,922 8,648 
Deferred revenue824 1,291 
Equity compensation3,090 1,668 
Lease liabilities15,768 13,066 
Accrued vacation339 409 
Bad debt383 164 
Other1,234 260 
Gross deferred tax assets92,977 60,381 
Less: Valuation allowance(65,914)(35,607)
Total deferred tax assets27,063 24,774 
Deferred tax liabilities:
Prepaid expenses(11,082)(9,562)
Right-of-use assets(8,270)(6,488)
Unbilled receivables(2,559)(3,849)
Depreciation(4,221)(4,377)
Other(512)(42)
Total deferred tax liabilities(26,644)(24,318)
Net deferred tax asset$419 $456 
Summary of Income Tax Contingencies The following table summarizes the activity related to our unrecognized tax benefit from January 1, 2018 to December 31, 2020 (in thousands):
Balance as of December 31, 2017
$651 
Additions for tax positions in current years 388 
Additions for tax positions in prior years — 
Reductions due to lapse in statutes of limitations — 
Settlements — 
Balance as of December 31, 2018
1,039 
Additions for tax positions in current years 536 
Additions for tax positions in prior years — 
Reductions due to lapse in statutes of limitations — 
Settlements — 
Balance as of December 31, 2019
1,575 
Additions for tax positions in current years 702 
Additions for tax positions in prior years — 
Reductions due to lapse in statutes of limitations — 
Settlements — 
Balance as of December 31, 2020
$2,277