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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Cash flows from operating activities:    
Net loss $ (2,574,000) $ (2,044,000)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 36,000 82,000
Stock-based compensation 165,000 134,000
Accrued interest 30,000 112,000
Amortization of lease right-of-use asset 98,000 43,000
Change in operating lease liability (93,000) (50,000)
Gain on settlement of convertible notes payable and accrued interest, net (48,000)  
Changes in assets and liabilities:    
Accounts receivable 69,000 574,000
Inventories (427,000) (48,000)
Prepaid expenses and other assets 280,000 221,000
Accounts payable 13,000 (170,000)
Deferred revenue and other liabilities 276,000 (19,000)
Net cash used in operating activities (2,754,000) (1,165,000)
Cash flows from investing activities:    
Purchases of property and equipment (11,000) (12,000)
Proceeds from maturities of short-term investments   300,000
Purchases of investments (9,579,000)  
Net cash provided by (used in) investing activities (9,590,000) 288,000
Cash flows from financing activities:    
Proceeds from sale of common stock, net 18,785,000 1,619,000
Proceeds from exercise of common stock warrants 4,174,018 2,000
Repayment of convertible notes payable (3,027,000)  
Taxes paid to net share settle equity awards (2,000) (1,000)
Net cash provided by financing activities 19,930,000 2,199,000
Net increase in cash and cash equivalents 7,586,000 1,322,000
Cash and cash equivalents at beginning of period 5,889,000 6,053,000
Cash and cash equivalents at end of period 13,475,000 7,375,000
Supplemental disclosure:    
Issuance of convertible notes in settlement of accrued interest   112,000
Settlement of accrued interest through issuance of common shares 123,000  
Fair value of warrant exercise price adjustment considered as deemed dividend   392,000
PPP Note    
Adjustments to reconcile net loss to net cash used in operating activities:    
Gain on extinguishment of PPP Note $ (579,000)  
Cash flows from financing activities:    
Proceeds from PPP note   $ 579,000