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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    
Stock-based compensation 211     211  
Net loss and other comprehensive loss (4,881)       (4,881)
Ending Balance at Mar. 31, 2019 9,929   $ 9 56,372 (46,452)
Ending Balance, Shares at Mar. 31, 2019     9,447,361    
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    
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 437     437  
Net loss and other comprehensive loss (8,177)       (8,177)
Ending Balance at Mar. 31, 2020 $ 11,745   $ 16 $ 77,488 $ (65,759)
Ending Balance, Shares at Mar. 31, 2020   3,796 16,069,562