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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Cash flows from operating activities:              
Net loss $ (2,473) $ (1,642) $ (4,340) $ (541) $ (4,115) $ (4,881)  
Adjustments to reconcile net loss to net cash used in operating activities:              
Gain on forgiveness of PPP loan 0   0   (801) 0  
Depreciation 53   46   100 92  
Stock-based compensation 208   41   348 61  
Change in fair value of warrant liabilities 0   3,300   0 2,427  
Provision for doubtful accounts receivable 2   0   8 (12)  
Provision for slow-moving and obsolete inventories (28)   (241)   61 (319)  
Provision for warranties 0   (24)   12 20  
Amortization of loan discounts and origination fees 59   38   97 76  
Changes in operating assets and liabilities (sources / (uses) of cash):              
Accounts receivable 358   (614)   890 (169)  
Inventories (586)   (959)   (2,549) 587  
Short-term deposits 137   25   149 (215)  
Prepaid and other assets (32)   (36)   (28) 17  
Accounts payable (869)   1,429   82 1,277  
Accrued and other liabilities (149)   71   (358) 293  
Deferred revenue (2)   57   (1) 43  
Total adjustments (849)   3,133   (1,990) 4,178  
Net cash used in operating activities (3,322)   (1,207)   (6,105) (703)  
Cash flows from investing activities:              
Acquisitions of property and equipment (102)   (71)   (211) (118)  
Net cash used in investing activities (102)   (71)   (211) (118)  
Cash flows from financing activities (sources / (uses) of cash):              
Proceeds from the issuance of common stock and warrants 5,000   0   5,000 2,750  
Proceeds from the exercise of warrants 0   51   527 51  
Offering costs paid on the issuance of common stock and warrants (469)   0   (469) (474) $ (510)
Proceeds from PPP loan 0   795   0 795  
Principal payments under finance lease obligations (1)   (1)   (2) (2)  
Proceeds from exercise of stock options and employee stock purchase plan purchases 59   30   59 30  
Common stock withheld in lieu of income tax withholding on vesting of restricted stock units 0   (3)   (2) (3)  
Proceeds from the Streeterville note 1,515   0   1,515 0  
Payments on the Iliad note 0   (300)   0 (526)  
Deferred financing costs (30)   0   (30) 0  
Net proceeds from credit line borrowings - AFS 0   522   0 577  
Net payments on the credit line borrowings - Credit Facilities (1,871)   0   (791) 0  
Net cash provided by financing activities 4,203   1,094   5,807 3,198  
Net increase (decrease) in cash and restricted cash 779   (184)   (509) 2,377  
Cash and restricted cash, beginning of period 890 2,178 3,253 692 2,178 692 692
Cash and restricted cash, end of period 1,669 890 3,069 3,253 1,669 3,069 2,178
Classification of cash and restricted cash:              
Cash 1,327   2,727   1,327 2,727 1,836
Restricted cash held in other assets 342   342   342 342 300
Cash and restricted cash $ 1,669 $ 890 $ 3,069 $ 3,253 $ 1,669 $ 3,069 $ 2,178