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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Cash flows from operating activities:    
Net loss $ (1,369,000) $ (1,405,000)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 18,000 41,000
Stock-based compensation 68,000 68,000
Accrued interest 30,000 55,000
Amortization of lease right-of-use asset 49,000 47,000
Change in operating lease liability (46,000) (50,000)
Gain on settlement of convertible notes payable and accrued interest, net (48,000)  
Changes in assets and liabilities:    
Accounts receivable 325,000 636,000
Inventories (263,000) (137,000)
Prepaid expenses and other assets 134,000 (35,000)
Accounts payable 5,000 (111,000)
Deferred revenue and other liabilities 84,000 183,000
Net cash used in operating activities (1,013,000) (708,000)
Cash flows from investing activities:    
Purchases of property and equipment (2,000) (6,000)
Proceeds from maturities of short-term investments   300,000
Purchases of short-term investments (1,611,000)  
Net cash provided by (used in) investing activities (1,613,000) 294,000
Cash flows from financing activities:    
Proceeds from sale of common stock, net 6,817,000  
Proceeds from exercise of common stock warrants 2,478,461 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 6,266,000 1,000
Net increase (decrease) in cash and cash equivalents 3,640,000 (413,000)
Cash and cash equivalents at beginning of period 5,889,000 6,053,000
Cash and cash equivalents at end of period 9,529,000 5,640,000
Supplemental disclosure:    
Issuance of convertible notes in settlement of accrued interest   $ 112,000
Settlement of accrued interest through issuance of common shares $ 123,000