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Condensed Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Common Stock [Member]
Additional Paid-In Capital [Member]
Accumulated Deficit [Member]
Series X1 Non-Voting Convertible Preferred Stock [Member]
Beginning Balance at Dec. 31, 2018 $ 14,492 $ 1 $ 56,062 $ (41,571)  
Beginning Balance, Shares at Dec. 31, 2018   523,452      
Issuance of common stock at-the-market, net of issuance costs 107   107    
Issuance of common stock at-the-market, net of issuance costs, Shares   1,401      
Issuance of common stock in connection with exercise of warrants, net of issuance costs 9,569   9,569    
Issuance of common stock in connection with exercise of warrants, net of issuance costs, Shares   191,617      
Issuance of common stock in connection with exercise of options, shares   4,359      
Stock-based compensation 1,065   1,065    
Net loss and other comprehensive loss (11,867)     (11,867)  
Ending Balance at Sep. 30, 2019 13,366 $ 1 66,803 (53,438)  
Ending Balance, Shares at Sep. 30, 2019   720,829      
Beginning Balance at Jun. 30, 2019 16,032 $ 1 66,576 (50,545)  
Beginning Balance, Shares at Jun. 30, 2019   720,829      
Stock-based compensation 227   227    
Net loss and other comprehensive loss (2,893)     (2,893)  
Ending Balance at Sep. 30, 2019 13,366 $ 1 66,803 (53,438)  
Ending Balance, Shares at Sep. 30, 2019   720,829      
Beginning Balance at Dec. 31, 2019 $ 9,465 $ 1 67,046 (57,582)  
Temporary Equity, Beginning Balance, Shares at Dec. 31, 2019 0        
Beginning Balance, Shares at Dec. 31, 2019   720,408      
Issuance of common stock in connection with exercise of warrants, net of issuance costs $ 5,191   5,191    
Issuance of common stock in connection with exercise of warrants, net of issuance costs, Shares   404,068      
Issuance of common stock in connection with conversion of preferred stock, shares (3,285) 182,500      
Issuance of common stock in connection with vesting of restricted stock units   3,056      
Issuance of common stock in connection with acquisition $ 1,194   1,194    
Issuance of common stock in connection with acquisition, shares   175,488      
Cancellation of common stock in connection with exchange for preferred stock, Shares 3,796 (210,889)      
Issuance of preferred stock in connection with acquisition         $ 69,723
Issuance of preferred stock in connection with acquisition,shares         140,026
Issuance of preferred stock in connection with PIPE transaction, net of issuance costs         $ 95,226
Issuance of preferred stock in connection with PIPE transaction, net of issuance costs, shares         199,112
Fair value of options assumed in acquisition $ 3,278   3,278    
Fair value of warrants assumed in acquisition 12,944   12,944    
Warrant inducement expense 4,829   4,829    
Stock-based compensation 1,512   1,512    
Net loss and other comprehensive loss (16,907)     (16,907)  
Ending Balance at Sep. 30, 2020 $ 21,506 $ 1 95,994 (74,489)  
Temporary Equity, Ending Balance, Shares at Sep. 30, 2020 339,138       339,138
Temporary Equity,Ending Balance at Sep. 30, 2020 $ 164,949       $ 164,949
Ending Balance, Shares at Sep. 30, 2020 511 1,274,631      
Beginning Balance at Jun. 30, 2020 $ 9,356 $ 1 77,700 (68,345)  
Beginning Balance, Shares at Jun. 30, 2020 511 1,076,642      
Issuance of common stock in connection with exercise of warrants, net of issuance costs, Shares   20,834      
Issuance of common stock in connection with vesting of restricted stock units   1,667      
Issuance of common stock in connection with acquisition $ 1,194   1,194    
Issuance of common stock in connection with acquisition, shares   175,488      
Issuance of preferred stock in connection with acquisition         $ 69,723
Issuance of preferred stock in connection with acquisition,shares         140,026
Issuance of preferred stock in connection with PIPE transaction, net of issuance costs         $ 95,226
Issuance of preferred stock in connection with PIPE transaction, net of issuance costs, shares         199,112
Fair value of options assumed 3,278   3,278    
Fair value of warrants assumed 12,944   12,944    
Stock-based compensation 878   878    
Net loss and other comprehensive loss (6,144)     (6,144)  
Ending Balance at Sep. 30, 2020 $ 21,506 $ 1 $ 95,994 $ (74,489)  
Temporary Equity, Ending Balance, Shares at Sep. 30, 2020 339,138       339,138
Temporary Equity,Ending Balance at Sep. 30, 2020 $ 164,949       $ 164,949
Ending Balance, Shares at Sep. 30, 2020 511 1,274,631