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Condensed Statements of Stockholders' Equity (Unaudited) - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
Accumulated Other Comprehensive Income (Loss)
Accumulated Deficit
Beginning balance at Dec. 31, 2019 $ 338,928 $ 1 $ 693,426 $ 7 $ (354,506)
Beginning balance, shares at Dec. 31, 2019   85,872,320      
Issuance of common stock upon exercise of options 2,564   2,564    
Issuance of common stock upon exercise of options, shares   964,085      
Issuance of common stock upon vesting of restricted stock units, net of shares withheld for employee taxes (151)   (151)    
Issuance of common stock upon vesting of restricted stock units, net of shares withheld for employee taxes, shares   14,289      
Stock-based compensation expense 3,410   3,410    
Other comprehensive income (loss) 314     314  
Net loss (38,503)       (38,503)
Ending balance at Mar. 31, 2020 306,562 $ 1 699,249 321 (393,009)
Ending balance, shares at Mar. 31, 2020   86,850,694      
Beginning balance at Dec. 31, 2020 191,293 $ 1 723,302 11 (532,021)
Beginning balance, shares at Dec. 31, 2020   89,301,664      
Issuance of common stock upon exercise of options 3,973   3,973    
Issuance of common stock upon exercise of options, shares   543,963      
Issuance of common stock upon vesting of restricted stock units, net of shares withheld for employee taxes, shares   829,641      
Stock-based compensation expense 11,278   11,278    
Purchase of capped calls (33,666)   (33,666)    
Equity component of convertible senior notes, net of issuance costs 93,031   93,031    
Other comprehensive income (loss) (11)     $ (11)  
Net loss (55,993)       (55,993)
Ending balance at Mar. 31, 2021 $ 209,905 $ 1 $ 797,918   $ (588,014)
Ending balance, shares at Mar. 31, 2021   90,675,268