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Consolidated Statements of Stockholders' Equity (Unaudited) - 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 Deficit
Accumulated Deficit
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   $ 8,050   $ 3   $ 8,047    
Proceeds from issuance of common stock, net of issuance costs, Shares       2,447,211        
Issuance of common stock under employee stock purchase plan 33       33      
Issuance of common stock under employee stock purchase plan, Shares     19,061          
Exercise of options, shares     216          
Issuance of restricted stock, shares     242,454          
Restricted stock awards withheld for payment of employees' withholding tax liability (65)       (65)      
Restricted stock awards withheld for payment of employees' withholding tax liability, Shares     (15,970)          
Cancellation of restricted stock     (2,719)          
Equity-based compensation expense 877       877      
Unrealized gain (loss) on securities (9)           (9)  
Net loss (14,971)             (14,971)
Balance at Mar. 31, 2021 109,050   $ 41   354,286   5 (245,282)
Balance (in Shares) at Mar. 31, 2021     40,873,526          
Balance at Dec. 31, 2021 147,266   $ 70   438,113   (45) (290,872)
Balance (in Shares) at Dec. 31, 2021     69,698,844          
Issuance of common stock under employee stock purchase plan 83       83      
Issuance of common stock under employee stock purchase plan, Shares     40,528          
Exercise of options 52       52      
Exercise of options, shares     30,622          
Issuance of restricted stock, shares     507,260          
Cancellation of restricted stock     (9,668)          
Equity-based compensation expense 890       890      
Unrealized gain (loss) on securities (300)           (300)  
Net loss (15,697)             (15,697)
Balance at Mar. 31, 2022 $ 132,294   $ 70   $ 439,138   $ (345) $ (306,569)
Balance (in Shares) at Mar. 31, 2022     70,267,586