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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 Other Comprehensive Income (Loss)
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          
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, 2020 115,135   $ 38   345,394   14 (230,311)
Balance (in Shares) at Dec. 31, 2020     38,183,273          
Exercise of options 64       64      
Exercise of options, shares     32,113          
Issuance of common stock under employee stock purchase plan 33       33      
Issuance of common stock under employee stock purchase plan, Shares     19,061          
Proceeds from issuance of common stock, net of issuance costs 32,575 $ 8,050 $ 11 $ 3 32,564 $ 8,047    
Proceeds from issuance of common stock, net of issuance costs, Shares     11,500,000 2,447,211        
Issuance of restricted stock, shares     242,454          
Restricted stock awards withheld for payment of employees' withholding tax liability (73)       (73)      
Restricted stock awards withheld for payment of employees' withholding tax liability, Shares     18,187          
Cancellation of restricted stock     30,581          
Equity-based compensation expense 1,753       1,753      
Unrealized gain (loss) on securities (3)           (3)  
Net loss (29,456)             (29,456)
Balance at Jun. 30, 2021 128,078   $ 52   387,782   11 (259,767)
Balance (in Shares) at Jun. 30, 2021     52,375,344          
Balance at Mar. 31, 2021 109,050   $ 41   354,286   5 (245,282)
Balance (in Shares) at Mar. 31, 2021     40,873,526          
Exercise of options 64       64      
Exercise of options, shares     31,897          
Proceeds from issuance of common stock, net of issuance costs 32,575   $ 11   32,564      
Proceeds from issuance of common stock, net of issuance costs, Shares     11,500,000          
Restricted stock awards withheld for payment of employees' withholding tax liability (8)       (8)      
Restricted stock awards withheld for payment of employees' withholding tax liability, Shares     2,217          
Cancellation of restricted stock     27,862          
Equity-based compensation expense 876       876      
Unrealized gain (loss) on securities 6           6  
Net loss (14,485)             (14,485)
Balance at Jun. 30, 2021 128,078   $ 52   387,782   11 (259,767)
Balance (in Shares) at Jun. 30, 2021     52,375,344          
Balance at Dec. 31, 2021 147,266   $ 70   438,113   (45) (290,872)
Balance (in Shares) at Dec. 31, 2021     69,698,844          
Exercise of options 61       61      
Exercise of options, shares     35,562          
Issuance of common stock under employee stock purchase plan 83       83      
Issuance of common stock under employee stock purchase plan, Shares     40,490          
Issuance of restricted stock, shares     507,260          
Cancellation of restricted stock     51,921          
Equity-based compensation expense 1,867       1,867      
Unrealized gain (loss) on securities (388)           (388)  
Net loss (31,539)             (31,539)
Balance at Jun. 30, 2022 117,350   $ 70   440,124   (433) (322,411)
Balance (in Shares) at Jun. 30, 2022     70,230,235          
Balance at Mar. 31, 2022 132,294   $ 70   439,138   (345) (306,569)
Balance (in Shares) at Mar. 31, 2022     70,267,586          
Exercise of options 9       9      
Exercise of options, shares     4,940          
Issuance of common stock under employee stock purchase plan, Shares     (38)          
Cancellation of restricted stock     42,253          
Equity-based compensation expense 977       977      
Unrealized gain (loss) on securities (88)           (88)  
Net loss (15,842)             (15,842)
Balance at Jun. 30, 2022 $ 117,350   $ 70   $ 440,124   $ (433) $ (322,411)
Balance (in Shares) at Jun. 30, 2022     70,230,235