Annual report pursuant to Section 13 and 15(d)

Income Taxes - Tax Rate Reconciliation (Details)

v3.20.4
Income Taxes - Tax Rate Reconciliation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Rate Reconciliation      
Tax benefit at federal statutory rate $ (4,971) $ (2,503) $ (2,292)
State taxes (465) (1,120) 222
Research and development credits (811) (693) (499)
Foreign operations taxed at different rates 2 1 (17)
Stock-based compensation 132 (3,606) (2,587)
Other nondeductible items 69 505 (3)
Executive compensation 24 872 838
Change in valuation allowance 6,359 6,561 4,301
Provision for (benefit from) income taxes $ 339 $ 17 $ (37)