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Income Taxes (Tables)
12 Months Ended
Dec. 31, 2020
Income Tax Disclosure [Abstract]  
Schedule of Components of Provision for Income Taxes
The following table presents components of the Company’s provision for income taxes as for the period presented (in thousands):
December 31,
202020192018
Current expense (benefit):
Federal$— $— $— 
State181 — — 
Foreign59 68 80 
Total current tax expense (benefit) 240 68 80 
Deferred expense (benefit):
Federal— — — 
State— — — 
Foreign(11)(3)(36)
Total deferred tax expense (benefit)(11)(3)(36)
Total Tax Expense (benefit)$229 $65 $44 
Schedule of Tax Expense Computed at Statutory Federal Rate and Tax Expense
The following table presents a reconciliation of the tax expense computed at the statutory federal rate and the Company’s tax expense for the period presented (in thousands):
December 31,
202020192018
Tax at statutory federal rate$(9,172)$(11,446)$(10,570)
Stock-based compensation(20,762)(5,560)(8,557)
Meals and Entertainment177 409 309 
Other805 614 148 
Tax credits(1,426)(1,128)(1,015)
2017 Tax Act— — 44 
Change in valuation allowance30,607 17,176 19,685 
Provision for income taxes$229 $65 $44 
Schedule of Significant Components of Deferred Tax Assets and Liabilities
Significant components of the Company’s deferred tax assets and liabilities are as follows (in thousands):
December 31,
20202019
Deferred tax assets:
Net operating loss carryforwards$91,034 $64,648 
Tax credit carryforwards7,110 5,601 
Share-based compensation8,831 5,932 
Allowances and other14,996 11,443 
Lease obligation22,624 23,869 
Total deferred tax assets144,595 111,493 
Valuation allowance(123,803)(88,433)
Net deferred tax assets20,792 23,060 
Deferred Tax Liabilities:
Depreciation and Amortization(108)(850)
Right of use asset(20,634)(22,171)
Total deferred tax liability(20,742)(23,021)
Total deferred tax assets$50 $39 
Schedule of Valuation Allowance for Deferred Tax Assets
The valuation allowance for deferred tax assets consisted of the following activity for the years ended December 31, 2020, 2019 and 2018 (in thousands):
Balance at beginning of yearAdditionsDeductionsBalance at end of year
Year Ended December 31, 2018$44,321 $22,114 $— $66,435 
Year Ended December 31, 201966,435 21,998 — 88,433 
Year Ended December 31, 2020$88,433 $35,370 $— $123,803 
Schedule of Unrecognized Tax Benefit
A reconciliation of the Company’s unrecognized tax benefit amount is as follows (in thousands):

Year Ended December 31,
202020192018
Balance at beginning of year$1,842 $1,459 $943 
Additions for tax positions taken in current year488 383 441 
Increases in balance related to prior year tax positions— — 75 
Decreases in balance related to prior year tax positions(28)— — 
Balance at end of year$2,302 $1,842 $1,459