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Income Taxes (Tables)
 12 Months Ended
Dec. 31, 2019
Income Tax Disclosure [Abstract]  
Schedule of loss before income taxes, domestic and foreign
Our loss before provision (benefit for) income taxes was as follows (in thousands): 
 Year Ended December 31,
 201920182017
United States$(11,751) $(10,653) $(22,994) 
Foreign(167) (262) 79  
Loss before provision for income taxes$(11,918) $(10,915) $(22,915) 
Components of provision for income taxes The components of the provision for income taxes are as follows (in thousands): 
 Year Ended December 31,
 201920182017
Current provision (benefit):
Federal$—  $—  $—  
State5  5  5  
Foreign18  (13) 64  
Total current provision (benefit)23  (8) 69  
Deferred provision (benefit):
Federal—  —  —  
State—  —  —  
Foreign(6) (29) 12  
Total deferred provision (benefit)(6) (29) 12  
Provision for (benefit from) income taxes$17  $(37) $81  
Reconciliation of provision for income taxes calculated at the statutory rate to provision for income taxes
Reconciliation of the provision for income taxes calculated at the statutory rate to our provision for (benefit from) income taxes is as follows (in thousands): 

 Year Ended December 31,
 201920182017
Tax benefit at federal statutory rate$(2,503) $(2,292) $(7,791) 
State taxes(1,120) 222  48  
Research and development credits(693) (499) (399) 
Foreign operations taxed at different rates1  (17) (2) 
Stock-based compensation(3,606) (2,587) (216) 
Other nondeductible items505  (3) 326  
Executive compensation872  838  73  
Change in valuation allowance6,561  4,301  (26,058) 
Change in statutory tax rate—  —  34,100  
Provision for (benefit from) income taxes$17  $(37) $81  
Significant components of our deferred tax assets and liabilities
Significant components of our deferred tax assets and liabilities are as follows (in thousands): 

 December 31,
 20192018
Deferred tax assets:
Net operating losses$68,422  $60,455  
Credits8,494  7,174  
Deferred revenues468  1,879  
Stock-based compensation2,338  2,967  
Reserves and accruals1,545  1,876  
Depreciation1,358  1,376  
Intangible assets2,159  2,557  
Capital losses26  576  
Unrealized gain/loss406  297  
Lease liability5,974  —  
Other assets92  83  
Total deferred tax assets:91,282  79,240  
Valuation allowance(85,768) (79,222) 
Deferred tax liabilities:
Right-of-use assets(5,514) —  
Other(40) (64) 
Total deferred tax liabilities:(5,554) (64) 
Net deferred tax liabilities$(40) $(46) 
Summary of federal, state and foreign NOL carryforwards and federal research and development tax credits
The following table sets forth our federal, state and foreign NOL carryforwards and federal research and development tax credits as of December 31, 2019 (in thousands): 
 December 31, 2019
 Amount
Expiration
Years
Net operating losses, federal$224,476  2022-2037
Net operating losses, federal$64,371  Do not expire
Net operating losses, state$124,881  2028-2039
Tax credits, federal$9,031  2022-2039
Tax credits, state$10,436  Do not expire
Net operating losses, foreign$536  Various
Reconciliation of the beginning and ending amount of unrecognized tax benefits A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows (in thousands): 
 December 31,
 201920182017
Balance at beginning of year$9,980  $9,422  $8,566  
Additions based on tax positions related to current year1,362  1,087  880  
Reductions to tax provision of prior years(12) (529) (24) 
Balance at end of year$11,330  $9,980  $9,422