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Condensed Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Preferred Stock [Member]
Common Stock [Member]
Additional Paid-In Capital [Member]
Accumulated Deficit [Member]
Beginning Balance at Dec. 31, 2018 $ 14,492   $ 9 $ 56,054 $ (41,571)
Beginning Balance, Shares at Dec. 31, 2018     9,422,143    
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     25,218    
Issuance of common stock in connection with exercise of warrants, net of issuance costs 9,569   $ 4 9,565  
Issuance of common stock in connection with exercise of warrants, net of issuance costs, Shares     3,449,112    
Issuance of common stock in connection with exercise of options, shares     78,450    
Stock-based compensation 838     838  
Net loss and other comprehensive loss (8,974)       (8,974)
Ending Balance at Jun. 30, 2019 16,032   $ 13 66,564 (50,545)
Ending Balance, Shares at Jun. 30, 2019     12,974,923    
Beginning Balance at Mar. 31, 2019 9,929   $ 9 56,372 (46,452)
Beginning Balance, Shares at Mar. 31, 2019     9,447,361    
Issuance of common stock in connection with exercise of warrants, net of issuance costs 9,569   $ 4 9,565  
Issuance of common stock in connection with exercise of warrants, net of issuance costs, Shares     3,449,112    
Issuance of common stock in connection with exercise of options, shares     78,450    
Stock-based compensation 627     627  
Net loss and other comprehensive loss (4,093)       (4,093)
Ending Balance at Jun. 30, 2019 16,032   $ 13 66,564 (50,545)
Ending Balance, Shares at Jun. 30, 2019     12,974,923    
Beginning Balance at Dec. 31, 2019 9,465   $ 13 67,034 (57,582)
Beginning Balance, Shares at Dec. 31, 2019     12,967,338    
Issuance of common stock in connection with exercise of warrants, net of issuance costs 5,191   $ 7 5,184  
Issuance of common stock in connection with exercise of warrants, net of issuance costs, Shares     6,898,224    
Issuance of common stock in connection with conversion of preferred stock     $ 3 (3)  
Issuance of common stock in connection with conversion of preferred stock, shares   (3,285) 3,285,000    
Issuance of common stock in connection with vesting of restricted stock units     25,000    
Cancellation of common stock in connection with exchange for preferred stock     $ (4) 4  
Cancellation of common stock in connection with exchange for preferred stock, Shares   3,796 (3,796,000)    
Warrant inducement expense 4,829     4,829  
Stock-based compensation 634     634  
Net loss and other comprehensive loss (10,763)       (10,763)
Ending Balance at Jun. 30, 2020 9,356   $ 19 77,682 (68,345)
Ending Balance, Shares at Jun. 30, 2020   511 19,379,562    
Beginning Balance at Mar. 31, 2020 11,745 $ 3,796 $ 16 77,488 (65,759)
Beginning Balance, Shares at Mar. 31, 2020     16,069,562    
Issuance of common stock in connection with conversion of preferred stock     $ 3 (3)  
Issuance of common stock in connection with conversion of preferred stock, shares   (3,285) 3,285,000    
Issuance of common stock in connection with vesting of restricted stock units     25,000    
Stock-based compensation 197     197  
Net loss and other comprehensive loss (2,586)       (2,586)
Ending Balance at Jun. 30, 2020 $ 9,356   $ 19 $ 77,682 $ (68,345)
Ending Balance, Shares at Jun. 30, 2020   511 19,379,562