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Condensed Consolidated Statements of Changes in Convertible Preferred Stock and Stockholders’ Equity (unaudited) - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-In Capital
Accumulated Deficit
Series X Convertible Preferred Stock
Preferred Stock
Balance, beginning (in shares) at Dec. 31, 2020   44,876,408     1,044,278
Balance, beginning at Dec. 31, 2020 $ 10,715 $ 4 $ 345,411 $ (334,700) $ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Public offering of common stock, net of issuance costs (in shares)   3,327,706      
Public offering of common stock, net of issuance costs 8,589 $ 1 8,588    
Issuance of common stock for exercise of stock options (in shares)   486      
Issuance of common stock for exercise of options 1   1    
Issuance of common stock for restricted share units vested (in shares)   84,070      
Stock-based compensation 879   879    
Net income (loss) (18,292)     (18,292)  
Balance, ending (in shares) at Mar. 31, 2021   48,288,670     1,044,278
Balance, ending at Mar. 31, 2021 1,892 $ 5 354,879 (352,992) $ 0
Balance, beginning (in shares) at Dec. 31, 2021   67,863,674     1,818,472
Balance, beginning at Dec. 31, 2021 21,573 $ 7 398,733 (377,167) $ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Public offering of common stock, net of issuance costs (in shares)   644,265      
Public offering of common stock, net of issuance costs $ 500   500    
Issuance of common stock for exercise of stock options (in shares) 0        
Issuance of common stock for restricted share units vested (in shares)   541,308      
Stock-based compensation $ 1,165   1,165    
Net income (loss) (18,281)     (18,281)  
Balance, ending (in shares) at Mar. 31, 2022   69,049,247     1,818,472
Balance, ending at Mar. 31, 2022 $ 4,957 $ 7 $ 400,398 $ (395,448) $ 0