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Income Taxes (Tables)
 12 Months Ended
Dec. 31, 2019
Income Tax Disclosure [Abstract]  
Loss Before the Provision For (Benefit From) Income Taxes
Loss before the provision for (benefit from) income taxes consisted of the following for the periods indicated (in thousands):
Year Ended December 31,
201920182017
Domestic$(60,807) $(50,133) $(31,681) 
International(8,145) (12,795) (6,879) 
Total$(68,952) $(62,928) $(38,560) 
Components of Income Tax Provision (Benefit)
The components of the Company's income tax provision (benefit) were as follows for the periods indicated (in thousands):
Year Ended December 31,
201920182017
Current tax expense (benefit)
Federal
$(17) $234  $—  
State
93  (10) 109  
Foreign
112  823  278  
Total current tax expense (benefit)
188  1,047  387  
Deferred tax expense (benefit)
Federal
315  317  99  
State
171  153  55  
Foreign
(866) (367) (554) 
Total deferred tax expense (benefit)
(380) 103  (400) 
Total income tax provision (benefit)
$(192) $1,150  $(13) 
Reconciliation of the Federal Statutory Tax Provision to the Effective Tax Provision
The reconciliation of the federal statutory income tax provision to the Company’s effective income tax provision is as follows for the periods indicated (in thousands):
Year Ended December 31,
201920182017
Federal tax benefit at statutory rate$(14,480) $(13,298) $(13,147) 
State tax93  (10) 2,009  
Foreign rate differential136  1,315  2,513  
Non-deductible permanent items(468) 4,129  1,142  
Stock-based compensation(9,850) (1,178) 1,950  
Tax credits(1,403) (922) (1,702) 
Change in valuation allowance25,780  11,114  (14,653) 
Tax Act-revaluation of deferred taxes—  —  21,875  
Total
$(192) $1,150  $(13) 
Deferred Tax Assets and Liabilities
The Company’s deferred tax assets and liabilities as of the dates indicated were as follows (in thousands):
Year Ended December 31,
20192018
Deferred tax assets:
Net operating losses
$78,001  $50,154  
Accruals and reserves
3,514  7,725  
Tax credit carryforward
11,013  8,503  
Stock-based compensation
8,280  5,944  
Depreciation and amortization
4,381  4,735  
Total deferred tax assets
105,189  77,061  
Valuation allowance(104,298) (75,436) 
Net deferred tax assets
891  1,625  
Deferred tax liabilities:
Depreciation and amortization(2,550) (3,665) 
Net deferred taxes
$(1,659) $(2,040) 
Deferred Tax Asset Valuation Allowance The activity in the Company's deferred tax asset valuation allowance for the periods indicated was as follows (in thousands):
Balance, Beginning of PeriodCharged to Costs & ExpensesCharged to Other AccountsDeductionsBalance, end of Period
Year ended December 31, 2019
Deferred tax asset valuation allowance$75,436  29,576  (714) —  $104,298  
Year ended December 31, 2018
Deferred tax asset valuation allowance$58,748  13,243  3,445  —  $75,436  
Year ended December 31, 2017
Deferred tax asset valuation allowance$59,806  —  —  (1,058) $58,748  
Reconciliation of Unrecognized Tax Benefits A reconciliation of the beginning and ending amount of unrecognized tax benefit is as follows (in thousands):
Balance as of December 31, 2016$—  
Gross amount of increases in unrecognized tax benefits for tax positions taken in current year1,526  
Gross amount of increases in unrecognized tax benefits for tax positions taken in prior year3,970  
Balance as of December 31, 20175,496  
Gross amount of increases in unrecognized tax benefits for tax positions taken in current year1,744  
Gross amount of decreases in unrecognized tax benefits for tax positions taken in prior year—  
Balance as of December 31, 20187,240  
Gross amount of increases in unrecognized tax benefits for tax positions taken in current year2,584  
Gross amount of decreases in unrecognized tax benefits for tax positions taken in prior year—  
Balance as of December 31, 2019$9,824