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Condensed Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Common Stock [Member]
Additional Paid-In Capital [Member]
Accumulated Deficit [Member]
Total
Balance at Dec. 31, 2018 $ 206,409 $ (194,565) $ 11,844
Balance, shares at Dec. 31, 2018 4,932,723      
Adjustment for reverse stock split, shares 2,717
Issuance of common stock, net of issuance costs $ 1 $ 2,978 $ 2,979
Issuance of common stock, net of issuance costs, shares 2,394,955      
Exercise of pre-funded warrants 70 70
Exercise of pre-funded warrants, shares 697,500      
Share-based compensation 459 459
Net loss (5,156) (5,156)
Balance at Mar. 31, 2019 $ 1 209,916 (199,721) 10,196
Balance, shares at Mar. 31, 2019 8,027,895      
Balance at Dec. 31, 2018 206,409 (194,565) 11,844
Balance, shares at Dec. 31, 2018 4,932,723      
Net loss       (13,000)
Balance at Jun. 30, 2019 $ 2 225,655 (207,565) 18,092
Balance, shares at Jun. 30, 2019 19,624,560      
Balance at Mar. 31, 2019 $ 1 209,916 (199,721) 10,196
Balance, shares at Mar. 31, 2019 8,027,895      
Issuance of common stock, net of issuance costs 14,566 14,566
Issuance of common stock, net of issuance costs, shares 3,319,553      
Exercise of pre-funded warrants $ 1 82 83
Exercise of pre-funded warrants, shares 8,277,112      
Share-based compensation 1,091 1,091
Net loss   (7,844) (7,844)
Balance at Jun. 30, 2019 $ 2 225,655 (207,565) 18,092
Balance, shares at Jun. 30, 2019 19,624,560      
Balance at Dec. 31, 2019 $ 2 226,178 (215,161) 11,019
Balance, shares at Dec. 31, 2019 19,994,560      
Exercise of pre-funded warrants
Exercise of pre-funded warrants, shares 300,000      
Exercise of common stock options 21 21
Exercise of common stock options, shares 19,997      
Exercise of warrants 239 239
Exercise of warrants, shares 206,747      
Share-based compensation 343 343
Net loss (4,686) (4,686)
Balance at Mar. 31, 2020 $ 2 226,781 (219,847) 6,936
Balance, shares at Mar. 31, 2020 20,521,304      
Balance at Dec. 31, 2019 $ 2 226,178 (215,161) 11,019
Balance, shares at Dec. 31, 2019 19,994,560      
Net loss       (5,856)
Balance at Jun. 30, 2020 $ 3 234,899 (221,017) 13,885
Balance, shares at Jun. 30, 2020 25,749,356      
Balance at Mar. 31, 2020 $ 2 226,781 (219,847) 6,936
Balance, shares at Mar. 31, 2020 20,521,304      
Issuance of common stock, net of issuance costs $ 1 7,313 7,314
Issuance of common stock, net of issuance costs, shares 4,787,553      
Exercise of common stock options 3 3
Exercise of common stock options, shares 2,500      
Exercise of warrants 536 536
Exercise of warrants, shares 437,999      
Share-based compensation 266 266
Net loss (1,170) (1,170)
Balance at Jun. 30, 2020 $ 3 $ 234,899 $ (221,017) $ 13,885
Balance, shares at Jun. 30, 2020 25,749,356