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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-In Capital
Accumulated Other Comprehensive Income (Loss)
Accumulated Deficit
Balance at Dec. 31, 2018 $ 119,945 $ 12 $ 323,279 $ (4) $ (203,342)
Balance (in shares) at Dec. 31, 2018   11,954,528      
Stock-based compensation expense 3,204   3,204    
Stock-based compensation expense   24,235      
Issuance of common stock from ESPP purchases and stock option exercises 327   327    
Issuance of common stock from ESPP purchases and stock option exercises, shares   62,072      
Unrealized (loss) gain on available-for-sale debt securities 38     38  
Net loss (55,178)       (55,178)
Balance at Dec. 31, 2019 68,336 $ 12 326,810 34 (258,520)
Balance (in shares) at Dec. 31, 2019   12,040,835      
Stock-based compensation expense 3,627   3,627    
Stock-based compensation expense   51,056      
Issuance of common stock from ESPP purchases and stock option exercises 435   435    
Issuance of common stock from ESPP purchases and stock option exercises, shares   82,853      
Issuance of common stock for public offering, net of issuance costs of $4,559 59,941 $ 10 59,931    
Issuance of common stock for public offering, net of issuance costs, shares   9,923,076      
Unrealized (loss) gain on available-for-sale debt securities (29)     (29)  
Net loss (56,241)       (56,241)
Balance at Dec. 31, 2020 $ 76,069 $ 22 $ 390,803 $ 5 $ (314,761)
Balance (in shares) at Dec. 31, 2020   22,097,820