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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-In Capital
Accumulated Other Comprehensive Income (Loss)
Accumulated Deficit
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 805   805    
Stock-based compensation expense, shares   7,817      
Issuance of common stock from stock grants and option exercises 339   339    
Issuance of common stock from stock grants and option exercises, shares   62,969      
Issuance of common stock for public offering, net of issuance costs 31,986 $ 5 31,981    
Issuance of common stock for public offering, net of issuance costs, shares   5,307,692      
Unrealized loss on available-for-sale debt securities 106     106  
Net loss (4,053)       (4,053)
Balance at Mar. 31, 2020 97,519 $ 17 359,935 140 (262,573)
Balance (in shares) at Mar. 31, 2020   17,419,313      
Balance at Dec. 31, 2019 68,336 $ 12 326,810 34 (258,520)
Balance (in shares) at Dec. 31, 2019   12,040,835      
Unrealized loss on available-for-sale debt securities (26)        
Net loss (37,334)        
Balance at Sep. 30, 2020 94,059 $ 22 389,883 8 (295,854)
Balance (in shares) at Sep. 30, 2020   22,082,924      
Balance at Mar. 31, 2020 97,519 $ 17 359,935 140 (262,573)
Balance (in shares) at Mar. 31, 2020   17,419,313      
Stock-based compensation expense 834   834    
Stock-based compensation expense, shares   16,048      
Issuance of common stock for public offering, net of issuance costs 27,955 $ 5 27,950    
Issuance of common stock for public offering, net of issuance costs, shares   4,615,384      
Unrealized loss on available-for-sale debt securities (99)     (99)  
Net loss (17,248)       (17,248)
Balance at Jun. 30, 2020 108,961 $ 22 388,719 41 (279,821)
Balance (in shares) at Jun. 30, 2020   22,050,745      
Stock-based compensation expense 1,068   1,068    
Stock-based compensation expense, shares   12,295      
Issuance of common stock from stock grants and option exercises 96   96    
Issuance of common stock from stock grants and option exercises, shares   19,884      
Unrealized loss on available-for-sale debt securities (33)     (33)  
Net loss (16,033)       (16,033)
Balance at Sep. 30, 2020 94,059 $ 22 389,883 8 (295,854)
Balance (in shares) at Sep. 30, 2020   22,082,924      
Balance at Dec. 31, 2020 76,069 $ 22 390,803 5 (314,761)
Balance (in shares) at Dec. 31, 2020   22,097,820      
Stock-based compensation expense 1,026   1,026    
Stock-based compensation expense, shares   10,149      
Issuance of common stock from stock grants and option exercises 182   182    
Issuance of common stock from stock grants and option exercises, shares   38,058      
Issuance of common stock for public offering, net of issuance costs 49,250 $ 9 49,241    
Issuance of common stock for public offering, net of issuance costs, shares   9,185,000      
Net loss (22,438)       (22,438)
Balance at Mar. 31, 2021 104,089 $ 31 441,252 5 (337,199)
Balance (in shares) at Mar. 31, 2021   31,331,027      
Balance at Dec. 31, 2020 76,069 $ 22 390,803 5 (314,761)
Balance (in shares) at Dec. 31, 2020   22,097,820      
Unrealized loss on available-for-sale debt securities (4)        
Net loss (67,604)        
Balance at Sep. 30, 2021 60,736 $ 31 443,069 1 (382,365)
Balance (in shares) at Sep. 30, 2021   31,392,618      
Balance at Mar. 31, 2021 104,089 $ 31 441,252 5 (337,199)
Balance (in shares) at Mar. 31, 2021   31,331,027      
Stock-based compensation expense 983   983    
Stock-based compensation expense, shares   13,713      
Issuance of common stock from stock grants and option exercises 23   23    
Issuance of common stock from stock grants and option exercises, shares   5,000      
Unrealized loss on available-for-sale debt securities (3)     (3)  
Net loss (19,928)       (19,928)
Balance at Jun. 30, 2021 85,164 $ 31 442,258 2 (357,127)
Balance (in shares) at Jun. 30, 2021   31,349,740      
Stock-based compensation expense 713   713    
Stock-based compensation expense, shares   15,961      
Issuance of common stock from stock grants and option exercises 98   98    
Issuance of common stock from stock grants and option exercises, shares   26,917      
Unrealized loss on available-for-sale debt securities (1)     (1)  
Net loss (25,238)       (25,238)
Balance at Sep. 30, 2021 $ 60,736 $ 31 $ 443,069 $ 1 $ (382,365)
Balance (in shares) at Sep. 30, 2021   31,392,618