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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Common Stock $0.001 Par Value
Additional Paid-in Capital
Accumulated Other Comprehensive Income (Loss)
Accumulated Deficit
Balance at Dec. 31, 2017 $ 85,038 $ 16 $ 156,685 $ (9) $ (71,654)
Balance (in Shares) at Dec. 31, 2017   16,272,617      
Effect of adoption of ASU | ASU 2014-09 (ASC 606) 324       324
Sale of common shares, net of issuance costs 82,666 $ 9 82,657    
Sale of common shares, net of issuance costs, shares   9,179,500      
Exercise of options 244   244    
Exercise of options, shares   19,830      
Cancellation of restricted stock   (70,468)      
Equity-based compensation expense 4,317   4,317    
Unrealized gain (loss) on securities (56)     (56)  
Net loss (48,435)       (48,435)
Balance at Dec. 31, 2018 124,098 $ 25 243,903 (65) (119,765)
Balance (in Shares) at Dec. 31, 2018   25,401,479      
Sale of common shares, net of issuance costs 56,997 $ 7 56,990    
Sale of common shares, net of issuance costs, shares   6,340,771      
Proceeds from issuance of pre-funded common stock warrants, net of issuance costs 22,874   22,874    
Issuance of restricted stock   $ 1 (1)    
Issuance of restricted stock, shares   585,600      
Cancellation of restricted stock   (61,036)      
Equity-based compensation expense 4,134   4,134    
Unrealized gain (loss) on securities 175     175  
Net loss (51,373)       (51,373)
Balance at Dec. 31, 2019 $ 156,905 $ 33 $ 327,900 $ 110 $ (171,138)
Balance (in Shares) at Dec. 31, 2019   32,266,814