Quarterly report pursuant to Section 13 or 15(d)

CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS??? EQUITY

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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-In-Capital
Accumulated Other Comprehensive Gain (Loss)
Accumulated Deficit
Beginning Balance (in shares) at Dec. 31, 2019   8,480,968      
Beginning Balance at Dec. 31, 2019 $ 7,574 $ 85 $ 92,497 $ (28) $ (84,980)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Issuance of common stock and common stock purchase warrants, net of issuance costs (in shares)   950,000      
Issuance of common stock and common stock purchase warrants, net of issuance costs 1,990 $ 10 1,980    
Issuance of common stock upon exercise of warrants (in shares)   221,293      
Issuance of common stock upon exercise of warrants 15 $ 2 13    
Issuance of common stock upon restricted stock unit settlement, net of shares withheld for taxes   19,643      
Issuance of common stock upon restricted stock unit settlement, net of shares withheld for taxes (13)   (13)    
Stock-based compensation 403   403    
Unrealized gain on available-for-sale marketable securities 28     28  
Net loss (4,103)       (4,103)
Ending Balance (in shares) at Mar. 31, 2020   9,671,904      
Ending Balance at Mar. 31, 2020 5,894 $ 97 94,880 0 (89,083)
Beginning Balance (in shares) at Dec. 31, 2019   8,480,968      
Beginning Balance at Dec. 31, 2019 7,574 $ 85 92,497 (28) (84,980)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net loss (9,222)        
Ending Balance (in shares) at Jun. 30, 2020   26,671,573      
Ending Balance at Jun. 30, 2020 19,910 $ 267 113,845 0 (94,202)
Beginning Balance (in shares) at Mar. 31, 2020   9,671,904      
Beginning Balance at Mar. 31, 2020 5,894 $ 97 94,880 0 (89,083)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Issuance of common stock and common stock purchase warrants, net of issuance costs (in shares)   14,790,133      
Issuance of common stock and common stock purchase warrants, net of issuance costs 18,679 $ 148 18,531    
Issuance of common stock upon exercise of warrants (in shares)   2,202,863      
Issuance of common stock upon exercise of warrants 7 $ 22 (15)    
Issuance of common stock upon restricted stock unit settlement, net of shares withheld for taxes   6,673      
Issuance of common stock upon restricted stock unit settlement, net of shares withheld for taxes (4)   (4)    
Stock-based compensation 453   453    
Net loss (5,119)       (5,119)
Ending Balance (in shares) at Jun. 30, 2020   26,671,573      
Ending Balance at Jun. 30, 2020 $ 19,910 $ 267 113,845 0 (94,202)
Beginning Balance (in shares) at Dec. 31, 2020 53,551,461 53,551,461      
Beginning Balance at Dec. 31, 2020 $ 27,135 $ 536 132,492 0 (105,893)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Issuance of common stock upon exercise of warrants (in shares)   12,444,887      
Issuance of common stock upon exercise of warrants 8,969 $ 124 8,845    
Issuance of common stock, net of issuance costs of $50 (in shares)   1,083,548      
Issuance of common stock, net of issuance costs of $50 1,628 $ 11 1,617    
Issuance of common stock upon restricted stock unit settlement, net of shares withheld for taxes   96,350      
Issuance of common stock upon restricted stock unit settlement, net of shares withheld for taxes (52) $ 1 (53)    
Stock-based compensation 469   469    
Net loss (9,005)       (9,005)
Ending Balance (in shares) at Mar. 31, 2021   67,176,246      
Ending Balance at Mar. 31, 2021 $ 29,144 $ 672 143,370 0 (114,898)
Beginning Balance (in shares) at Dec. 31, 2020 53,551,461 53,551,461      
Beginning Balance at Dec. 31, 2020 $ 27,135 $ 536 132,492 0 (105,893)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net loss $ (20,154)        
Ending Balance (in shares) at Jun. 30, 2021 71,945,222 71,945,222      
Ending Balance at Jun. 30, 2021 $ 22,353 $ 719 147,681 0 (126,047)
Beginning Balance (in shares) at Mar. 31, 2021   67,176,246      
Beginning Balance at Mar. 31, 2021 29,144 $ 672 143,370 0 (114,898)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Issuance of common stock and common stock purchase warrants, net of issuance costs (in shares)   4,768,976      
Issuance of common stock and common stock purchase warrants, net of issuance costs 3,937 $ 47 3,890    
Stock-based compensation 421   421    
Net loss $ (11,149)       (11,149)
Ending Balance (in shares) at Jun. 30, 2021 71,945,222 71,945,222      
Ending Balance at Jun. 30, 2021 $ 22,353 $ 719 $ 147,681 $ 0 $ (126,047)