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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Cash flows from operating activities:    
Net loss $ (7,861) $ (7,893)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock option compensation expense 25 54
Restricted stock compensation expense 30 4
Depreciation expense 48 65
Amortization of right of use assets 172 0
Warrant liability fair value adjustment 2,832 (7)
Non-cash interest income (3) 0
Interest expense accrued related to convertible notes 40 51
Debt discount amortization 0 2,160
Changes in assets and liabilities:    
Decrease in prepaid expenses and other assets (880) (108)
Decrease in accounts receivable (48) 523
Decrease in inventories (136) 61
Decrease in accounts payable and accrued expenses 901 2,902
Deferred revenue (188) (120)
Principal payments on operating leases (161) 0
Decrease in other non-current liabilities 0 (462)
Net cash used in operating activities (5,229) (2,770)
Cash flows from investing activities:    
Purchase of property, plant and equipment (180) (2)
Net cash (used in) investing activities (180) (2)
Cash flows from financing activities:    
Principal payments on financing leases (11) 0
Net proceeds from the issuance of debt 0 400
Net cash (used in) provided by financing activities (117) 550
Foreign currency effects on cash 64 (30)
Net (decrease) increase in cash and cash equivalents (5,462) (2,252)
Cash and cash equivalents:    
Beginning of period 10,183 3,578
End of period 4,721 1,326
Series D Preferred Stock [Member]    
Cash flows from financing activities:    
Net proceeds from sale of Series D Preferred Stock 0 150
Series E and Series E-1 Preferred Stock and Related Warrants [Member]    
Cash flows from financing activities:    
Registration of Series E and Series E-1 Preferred stock and related warrants $ (106) $ 0