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Condensed Statements of Convertible Preferred Stock and Stockholders' Equity (Deficit) (Unaudited) - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-In Capital
Accumulated Deficit
Accumulated Other Comprehensive Income (Loss)
Convertible Preferred Stock
Beginning Balance at Dec. 31, 2019 $ (102,954)   $ 2,879 $ (105,836) $ 3  
Temporary Equity, Beginning Balance, Shares at Dec. 31, 2019           117,809,883
Temporary Equity, Beginning Balance at Dec. 31, 2019           $ 131,363
Beginning Balance, Shares at Dec. 31, 2019   1,371,467        
Stock issued on exercise of stock options 11   11      
Stock issued on exercise of stock options, Shares   5,446        
Stock-based compensation expense 226   226      
Net loss (7,794)     (7,794)    
Unrealized gain (loss) on available-for-sale securities, net of tax (3)       (3)  
Ending Balance at Mar. 31, 2020 (110,514)   3,116 (113,630)    
Temporary Equity, Ending Balance, Shares at Mar. 31, 2020           117,809,883
Temporary Equity, Ending Balance at Mar. 31, 2020           $ 131,363
Ending Balance, Shares at Mar. 31, 2020   1,376,913        
Beginning Balance at Dec. 31, 2020 94,786 $ 2 228,155 (133,367) (4)  
Beginning Balance, Shares at Dec. 31, 2020   20,979,265        
Stock issued on exercise of stock options 92   92      
Stock issued on exercise of stock options, Shares   76,679        
Stock-based compensation expense 1,129   1,129      
Net loss (11,449)     (11,449)    
Unrealized gain (loss) on available-for-sale securities, net of tax 4       $ 4  
Ending Balance at Mar. 31, 2021 $ 84,562 $ 2 $ 229,376 $ (144,816)    
Ending Balance, Shares at Mar. 31, 2021   21,055,944