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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Operating activities:      
Net loss $ (5,824) $ (11,039) $ (9,658)
Adjustments to reconcile net loss to net cash used in operating activities:      
Depreciation and amortization 119 51 65
Gain from early operating lease termination 0 (54) 0
Impairment of property and equipment 0 0 32
Loss on disposal of property and equipment 0 1 3
Impairment of operating lease right-of-use assets 0 0 125
Stock option modification expense 0 53 105
Non-cash (gain) loss on changes in fair value of warrant liability (4,615) 5,216 (749)
Non-cash (gain) on changes in fair value of embedded derivative liability 0 (3) (424)
Interest expense related to amortization of debt issuance and debt discount 0 141 670
Interest expense related to amortization of debt issuance related to related party note payable 0 2 18
Issuance of warrants for services 0 0 59
Changes in operating assets and liabilities:      
Accounts receivable 452 (317) 2,319
Inventory (243) (116) (212)
Prepaid expenses and other current assets (52) 310 888
Operating lease right-of-use assets 25 816 861
Other assets 0 1 9
Accounts payable and accrued liabilities (163) (321) (1,841)
Operating lease liabilities (57) (878) (1,066)
Deferred rent 0 0 0
Related party note payable 0 73 204
Long-term obligations 0 0 42
Net cash used in operating activities (9,192) (4,721) (7,929)
Investing activities:      
Acquisition, net of cash (11,993) 0 0
Purchases of property and equipment (52) (26) (19)
Net cash used in investing activities (12,045) (26) (19)
Financing activities:      
Proceeds from preferred stock issuances, net 14,908 0 2,598
Proceeds from common stock issuances, net 1,776 5,220 6,698
Proceeds from exercise of warrants 0 7,098 67
Proceeds from exercise of options, net 0 7 189
Proceeds from issuance of related party note payable 0 0 1,000
Proceeds from stock options & RSUs sold to cover taxes 0 0 4
Proceeds from convertible notes, net of discount 0 0 2,000
Proceeds from line of credit 105 0 0
Payment on the convertible note (Note 12) 0 (1,563) (652)
Payment on the related party loan (Note 11) 0 (1,000) 0
Debt issuance cost 0 0 (202)
Net cash provided by financing activities 16,789 9,762 11,702
Net (decrease) increase in cash, cash equivalents, and restricted cash (4,448) 5,015 3,754
Cash, cash equivalents and restricted cash, beginning of year 12,427 7,412 3,658
Cash, cash equivalents and restricted cash, end of year 7,979 12,427 7,412
Supplemental disclosure of cash flow information:      
Interest paid 0 49 148
Income taxes paid 21 14 14
Non-cash payment of related party loan accrued interest by offsetting related party accounts receivables - see Note 11 0 277 0
Addition of operating lease, right-of-use asset 376 0 2,473
Fixed asset purchases, included in accounts payable and accrued liabilities 0 0 10
Fair value of warrants issued in connection with financings 14,172 0 5,269
Conversion of preferred stock to common stock 55 0 584
Reclassification of EmeryStation lease security deposit from long term to short term 0 0 65
Reclassification of EmeryStation sublease security deposit from long term to short term 0 0 198
Employees and Directors [Member] | Share-based Payment Arrangement, Option [Member]      
Adjustments to reconcile net loss to net cash used in operating activities:      
Stock-based compensation expense for options and stock issued 693 415 334
Nonemployees [Member]      
Adjustments to reconcile net loss to net cash used in operating activities:      
Issuance of RSUs 233 220 20
Nonemployees [Member] | Share-based Payment Arrangement, Option [Member]      
Adjustments to reconcile net loss to net cash used in operating activities:      
Stock-based compensation expense for options and stock issued 240 64 37
Employee [Member]      
Adjustments to reconcile net loss to net cash used in operating activities:      
Issuance of RSUs 0 2 10
Former Employee [Member]      
Adjustments to reconcile net loss to net cash used in operating activities:      
Issuance of RSUs 0 0 220
Accounting Standards Update 2017-11 [Member]      
Supplemental disclosure of cash flow information:      
Cumulative effect of adoption of New ASU 0 0 56
The 2019 Ladenburg Warrants [Member]      
Adjustments to reconcile net loss to net cash used in operating activities:      
Non-cash (gain) loss on changes in fair value of warrant liability 200    
Supplemental disclosure of cash flow information:      
Warrant liability transferred to equity in connection with exercise of warrants 0 9,108 553
The 2019 Preferred Warrant and 2019 Common Warrant Liability [Member]      
Supplemental disclosure of cash flow information:      
Warrant liability transferred to equity in connection with exercise of warrants $ 0 $ 197 $ 0