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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Cash flows from operating activities:    
Net loss $ (17,127) $ (21,371)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock option compensation expense 25 199
Restricted stock compensation expense 406 4
Depreciation expense 125 168
Amortization of right of use assets 492 1,535
Warrant liability fair value adjustment 2,832 (451)
Non-cash interest income 0 (23)
Equitization of expenses 0 1,474
Loss on issuance of financial instruments 0 1,715
Interest expense accrued related to convertible notes 120 33
Debt discount amortization 0 4,467
Changes in assets and liabilities:    
(Increase) decrease in prepaid expenses and other assets (100) 43
(Increase) decrease in accounts receivable (82) 564
(Increase) decrease in inventories (185) 85
Increase in deferred offering costs (268) 0
Decrease in accounts payable and accrued expenses (3,784) (4,289)
Decrease in deferred revenue (256) (360)
Decrease in operating lease liabilities (466) (1,488)
Decrease in other liabilities 0 (627)
Net cash used in operating activities (18,268) (18,322)
Cash flows from investing activities:    
Purchase of property, plant, and equipment (708) (2)
Net cash used in investing activities (708) (2)
Cash flows from financing activities:    
Principal payments on financing leases (26) (49)
Net proceeds from the issuance of debt 0 3,719
Net payments related to reverse stock split (106) 0
Net proceeds from Public Offering 19,377 0
Net proceeds from the exercise of warrants 601 0
Net cash provided by financing activities 19,912 30,330
Foreign currency effects on cash (39) (69)
Net increase in total cash 897 11,937
Total Cash:    
Beginning of period 10,183 3,578
Interest expense 7 4
End of period 11,080 15,515
Supplemental Disclosure of Non-Cash Investing and Financing Activities:    
Conversions of Preferred Stock into common stock 20 0
Reclassification of 2019 warrants from liability to equity 6,199 0
Exchange of 2019 warrants 0 13
Fair value of warrants issued 0 20,844
Adoption of ASC 842 lease standard 0 1,652
Right of use assets obtained in exchange for lease obligations 729 874
At-the-Market Offering [Member]    
Cash flows from financing activities:    
Gross proceeds from ATM Offering 70 0
Issuance costs related to ATM Offering (4) 0
Series E Preferred Stock [Member]    
Cash flows from financing activities:    
Net proceeds from sale of Series D Preferred Stock 0 26,510
Series D Preferred Stock [Member]    
Cash flows from financing activities:    
Net proceeds from sale of Series D Preferred Stock 0 150
Supplemental Disclosure of Non-Cash Investing and Financing Activities:    
Conversion of Series D Preferred Stock to debt $ 0 $ 1,160