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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Operating activities      
Net loss $ (8,177) $ (4,881)  
Adjustments to reconcile net loss to net cash used in operating activities:      
Depreciation and amortization 2 2  
Amortization of operating lease asset 44 43  
Warrant inducement expense 4,829    
Stock-based compensation 437 211  
Changes in operating assets and liabilities:      
Prepaid expenses and other assets 159 103  
Accounts payable and accrued expenses 552 537  
Operating lease liability (43) (38)  
Net cash used in operating activities (2,197) (4,023)  
Financing activities      
Proceeds from issuances of common stock, net   107  
Proceeds from exercise of warrants, net 5,191    
Net cash provided by financing activities 5,191 107  
Net change in cash 2,994 (3,916)  
Cash at beginning of period 8,791 12,972 $ 12,972
Cash at end of period $ 11,785 $ 9,056 $ 8,791