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CONSOLIDATED CONDENSED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Cash flows used in operating activities:      
Net loss $ (2,720) $ (1,087)  
Adjustments to reconcile net loss to net cash used in operating activities:      
Depreciation and amortization 88 94  
Amortization of deferred financing costs and debt discount 151 122  
Noncash lease expenses 1 4  
Change in fair value of warrants (2) (1,667)  
Stock-based compensation expense 107 12  
Increases (decreases) in cash caused by changes in operating assets and liabilities:      
Accounts receivable 0 191  
Other current assets (170) 405  
Other assets 0 14  
Accounts payable and accrued expenses (461) 410  
Net cash used in operating activities (3,006) (1,502)  
Cash flows provided by (used in) investing activities:      
Purchases of property and equipment (84) (11)  
Net cash used in investing activities (84) (11)  
Cash flows used in financing activities:      
Payment of financing lease liability (6) (18)  
Proceeds from exercise of warrants 2,017 0  
Proceeds from sale of common stock, net 7,180 0  
Net cash provided by (used in) financing activities 9,191 (18)  
Net increase (decrease) in cash and cash equivalents 6,101 (1,531)  
Cash and cash equivalents at beginning of period 8,346 17,592 $ 17,592
Cash and cash equivalents at end of period 14,447 16,061 $ 8,346
Cash paid during period for:      
Interest 96 227  
Supplemental schedule of non-cash investing and financing activities:      
Unpaid offering costs $ 102 $ 0