Annual report pursuant to Section 13 and 15(d)

Statements of Redeemable Convertible Preferred Stock and Stockholders' (Deficit) Equity

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Statements of Redeemable Convertible Preferred Stock and Stockholders' (Deficit) Equity - USD ($)
$ in Thousands
Total
Adoption of Accounting Standards Update (ASU) 2014-09
Redeemable Convertible Preferred Stock
Common Stock
Note Receivable from Stockholder
Additional Paid-in Capital
Accumulated Other Comprehensive Loss
Accumulated Deficit
Accumulated Deficit
Adoption of Accounting Standards Update (ASU) 2014-09
Balances at Dec. 31, 2017 $ (109,001)       $ (208) $ 6,218   $ (115,011)  
Temporary Equity Balance, Shares at Dec. 31, 2017     173,750,421            
Temporary Equity Balance at Dec. 31, 2017     $ 102,505            
Common Stock Balance, Shares at Dec. 31, 2017       465,330          
Issuance of common stock in connection with initial public offering, net of issuance costs 74,436     $ 6   74,430      
Issuance of common stock in connection with initial public offering, net of issuance costs, Shares       5,667,000          
Issuance of common stock in connection with private placement 10,000     $ 1   9,999      
Issuance of common stock in connection with private placement, Shares       666,666          
Exercise of common stock options and common stock warrants for cash 134         134      
Exercise of common stock options and common stock warrants for cash, Shares       20,726          
Issuance of Series C and E redeemable convertible preferred stock, net of issuance costs     $ 84,739            
Issuance of Series C and E redeemable convertible preferred stock, net of issuance costs, Shares     319,865,282            
Conversion of redeemable convertible preferred stock warrants to common stock warrants in connection with initial public offering 734         734      
Conversion of redeemable convertible preferred stock and warrants to common stock in connection with initial public offering 187,244     $ 16   187,228      
Conversion of redeemable convertible preferred stock and warrant to common stock in connection with initial public offering, Shares     (493,615,703)            
Conversion of redeemable convertible preferred stock and warrant to common stock in connection with initial public offering     $ (187,244)            
Conversion of redeemable convertible preferred stock to common stock in connection with initial public offering, shares       16,007,762          
Exercise of preferred stock warrants for cash 268         268      
Exercise of preferred stock warrants for cash, Shares       20,700          
Stock-based compensation expense 2,872         2,872      
Vesting of early exercised shares 8         8      
Payment of note receivable by stockholder 208       $ 208        
Net unrealized gain (loss) on available-for-sale securities (47)           $ (47)    
Net loss (35,317)             (35,317)  
Balances at Dec. 31, 2018 $ 131,539 $ 10,327   $ 23   281,891 (47) $ (150,328) $ 10,327
Common Stock Balance, Shares at Dec. 31, 2018       22,848,184          
Accounting Standards Update Extensible List us-gaap:AccountingStandardsUpdate201409Member             us-gaap:AccountingStandardsUpdate201409Member  
Exercise of common stock options $ 180         180      
Exercise of common stock options, Shares 191,153     35,204          
Issuance of common stock under Employee Stock Purchase Plan $ 1,260         1,260      
Issuance of common stock under Employee Stock Purchase Plan, Shares       131,939          
Vesting of restricted stock units       114,103          
Stock transaction associated with taxes withheld on restricted stock units (297)         (297)      
Stock transaction associated with taxes withheld on restricted stock units,Shares       (30,461)          
Stock-based compensation expense 10,312         10,312      
Net unrealized gain (loss) on available-for-sale securities 212           212    
Net loss (55,744)             $ (55,744)  
Balances at Dec. 31, 2019 97,789     $ 23   293,346 165 (195,745)  
Common Stock Balance, Shares at Dec. 31, 2019       23,098,969          
Exercise of common stock options $ 1,861         1,861      
Exercise of common stock options, Shares 257,834     171,354          
Issuance of common stock under Employee Stock Purchase Plan $ 1,285         1,285      
Issuance of common stock under Employee Stock Purchase Plan, Shares       195,992          
Vesting of restricted stock units       151,976          
Stock transaction associated with taxes withheld on restricted stock units (314)         (314)      
Stock transaction associated with taxes withheld on restricted stock units,Shares       (30,461)          
Issuance of common stock in connection with initial public offering, net of issuance costs 227,252     $ 20   227,232      
Issuance of common stock in connection with initial public offering, net of issuance costs, Shares       19,550,000          
Stock-based compensation expense 11,917         11,917      
Issuance of common stock warrants in connection with debt refinancing 619         619      
Issuance of common stock in connection with At-The-Market sale, net of issuance costs 23,803     $ 3   23,800      
Issuance of common stock in connection with At-The-Market sale, net of issuance costs, Shares       2,614,286          
Net unrealized gain (loss) on available-for-sale securities (36)           (36)    
Net loss (32,128)             (32,128)  
Balances at Dec. 31, 2020 $ 332,048     $ 46   $ 559,746 $ 129 $ (227,873)  
Common Stock Balance, Shares at Dec. 31, 2020       45,752,116