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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
At-the-market Offering
Common Stock $0.001 Par Value
Common Stock $0.001 Par Value
At-the-market Offering
Additional Paid-in Capital
Additional Paid-in Capital
At-the-market Offering
Accumulated Other Comprehensive Income (Loss)
Accumulated Deficit
Balance at Dec. 31, 2019 $ 156,905   $ 33   $ 327,900   $ 110 $ (171,138)
Balance (in Shares) at Dec. 31, 2019     32,266,814          
Proceeds from issuance of common stock, net of issuance costs   $ 13,534   $ 5   $ 13,529    
Proceeds from issuance of common stock, net of issuance costs, Shares       5,866,258        
Exercise of options 16       16      
Exercise of options, shares     9,472          
Issuance of restricted stock, shares     226,335          
Issuance of common stock under employee stock purchase plan 42       42      
Issuance of common stock under employee stock purchase plan, Shares     29,857          
Cancellation of restricted stock     (215,463)          
Equity-based compensation expense 3,907       3,907      
Unrealized gain (loss) on securities (96)           (96)  
Net loss (59,173)             (59,173)
Balance at Dec. 31, 2020 115,135   $ 38   345,394   14 (230,311)
Balance (in Shares) at Dec. 31, 2020     38,183,273          
Proceeds from issuance of common stock, net of issuance costs 81,039 $ 8,050 $ 29 $ 3 81,010 $ 8,047    
Proceeds from issuance of common stock, net of issuance costs, Shares     28,750,000 2,447,211        
Exercise of options 280       280      
Exercise of options, shares     139,772          
Issuance of restricted stock, shares     242,454          
Issuance of common stock under employee stock purchase plan 94       94      
Issuance of common stock under employee stock purchase plan, Shares     42,653          
Share withholding (73)       (73)      
Share withholding, shares     (28,725)          
Cancellation of restricted stock     (77,794)          
Equity-based compensation expense 3,361       3,361      
Unrealized gain (loss) on securities (59)           (59)  
Net loss (60,561)             (60,561)
Balance at Dec. 31, 2021 $ 147,266   $ 70   $ 438,113   $ (45) $ (290,872)
Balance (in Shares) at Dec. 31, 2021     69,698,844