Quarterly report pursuant to Section 13 or 15(d)

Condensed Statements of Stockholders' Equity (Unaudited)

v3.20.2
Condensed Statements of Stockholders' Equity (Unaudited) - USD ($)
$ in Thousands
Total
Cumulative Effect Period of Adoption Adjustment
Common Stock
Additional Paid-In Capital
Accumulated Other Comprehensive Income (Loss)
Accumulated Deficit
Accumulated Deficit
Cumulative Effect Period of Adoption Adjustment
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            
Exercise of common stock options $ 42     42      
Exercise of common stock options, Shares     8,347        
Issuance of common stock under Employee Stock Purchase Plan 671     671      
Issuance of common stock under Employee Stock Purchase Plan, Shares     68,910        
Stock-based compensation expense 2,286     2,286      
Net unrealized gain (loss) on available-for- sale securities 103       103    
Net income (loss) (14,250)         (14,250)  
Balances at Mar. 31, 2019 130,718   $ 23 284,890 56 (154,251)  
Common Stock Balance, Shares at Mar. 31, 2019     22,925,441        
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        
Net unrealized gain (loss) on available-for- sale securities 270            
Net income (loss) (40,955)            
Balances at Sep. 30, 2019 109,906   $ 23 290,616 223 (180,956)  
Common Stock Balance, Shares at Sep. 30, 2019     23,090,002        
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        
Exercise of common stock options, Shares 191,153            
Balances at Dec. 31, 2019 $ 97,789   $ 23 293,346 165 (195,745)  
Common Stock Balance, Shares at Dec. 31, 2019     23,098,969        
Balances at Mar. 31, 2019 130,718   $ 23 284,890 56 (154,251)  
Common Stock Balance, Shares at Mar. 31, 2019     22,925,441        
Exercise of common stock options 10     10      
Exercise of common stock options, Shares     1,762        
Stock-based compensation expense 2,463     2,463      
Net unrealized gain (loss) on available-for- sale securities 157       157    
Net income (loss) (13,793)         (13,793)  
Balances at Jun. 30, 2019 119,555   $ 23 287,363 213 (168,044)  
Common Stock Balance, Shares at Jun. 30, 2019     22,927,203        
Exercise of common stock options 81     81      
Exercise of common stock options, Shares     16,128        
Issuance of common stock under Employee Stock Purchase Plan 589     589      
Issuance of common stock under Employee Stock Purchase Plan, Shares     63,029        
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 2,880     2,880      
Net unrealized gain (loss) on available-for- sale securities 10       10    
Net income (loss) (12,912)         (12,912)  
Balances at Sep. 30, 2019 109,906   $ 23 290,616 223 (180,956)  
Common Stock Balance, Shares at Sep. 30, 2019     23,090,002        
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 56     56      
Exercise of common stock options, Shares     12,937        
Issuance of common stock under Employee Stock Purchase Plan 646     646      
Issuance of common stock under Employee Stock Purchase Plan, Shares     74,465        
Vesting of restricted stock units     41,050        
Stock-based compensation expense 2,707     2,707      
Issuance of common stock warrants in connection with debt refinancing 619     619      
Net unrealized gain (loss) on available-for- sale securities (137)       (137)    
Net income (loss) (19,595)         (19,595)  
Balances at Mar. 31, 2020 82,085   $ 23 297,374 28 (215,340)  
Common Stock Balance, Shares at Mar. 31, 2020     23,227,421        
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, Shares 191,153            
Net unrealized gain (loss) on available-for- sale securities $ 72            
Net income (loss) 27,416            
Balances at Sep. 30, 2020 244,119   $ 38 412,173 237 (168,329)  
Common Stock Balance, Shares at Sep. 30, 2020     38,092,978        
Balances at Mar. 31, 2020 82,085   $ 23 297,374 28 (215,340)  
Common Stock Balance, Shares at Mar. 31, 2020     23,227,421        
Exercise of common stock options 8     8      
Exercise of common stock options, Shares     1,257        
Vesting of restricted stock units     250        
Stock-based compensation expense 3,011     3,011      
Issuance of common stock in connection with public offering, net of issuance costs 91,411   $ 13 91,398      
Issuance of common stock in connection with public offering, net of issuance costs, Shares     12,650,000        
Net unrealized gain (loss) on available-for- sale securities 370       370    
Net income (loss) 29,872         29,872  
Balances at Jun. 30, 2020 206,757   $ 36 391,791 398 (185,468)  
Common Stock Balance, Shares at Jun. 30, 2020     35,878,928        
Exercise of common stock options 108     108      
Exercise of common stock options, Shares     12,308        
Issuance of common stock under Employee Stock Purchase Plan 639     639      
Issuance of common stock under Employee Stock Purchase Plan, Shares     121,527        
Vesting of restricted stock units     110,676        
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 At-The-Market sale, net of issuance costs 16,839   $ 2 16,837      
Issuance of common stock in connection with At-The-Market sale, net of issuance costs, Shares     2,000,000        
Stock-based compensation expense 3,112     3,112      
Net unrealized gain (loss) on available-for- sale securities (161)       (161)    
Net income (loss) 17,139         17,139  
Balances at Sep. 30, 2020 $ 244,119   $ 38 $ 412,173 $ 237 $ (168,329)  
Common Stock Balance, Shares at Sep. 30, 2020     38,092,978