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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Cash flows from operating activities:    
Net loss $ (5,981) $ (7,373)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 184 326
Stock-based compensation 131 616
Change in fair value of warrant liabilities 1,086 0
Provision for doubtful accounts receivable (20) (5)
Provision for slow-moving and obsolete inventories 610 (14)
Provision for warranties 31 78
Amortization of loan discounts and origination fees 395 108
Loss on dispositions of property and equipment 8 24
Change in operating assets and liabilities:    
Accounts receivable 377 (131)
Inventories 1,137 1,876
Short-term deposits (670) 699
Prepaid and other assets (18) (88)
Accounts payable 1,096 (2,214)
Accrued and other liabilities 349 (542)
Deferred revenue 54 (12)
Total adjustments 3,530 749
Net cash used in operating activities (2,451) (6,624)
Cash flows from investing activities:    
Acquisitions of property and equipment (223) (132)
Proceeds from the sale of property and equipment 0 3
Net cash used in investing activities (223) (129)
Cash flows from financing activities:    
Proceeds from the issuance of common stock and warrants 2,749 0
Proceeds from the exercise of warrants 918 0
Offering costs paid on the issuance of common stock and warrants (510) 0
Proceeds from PPP loan 795 0
Proceeds from exercise of stock options and purchases through employee stock purchase plan 100 0
Principal payments under finance lease obligations (3) (3)
Common stock withheld in lieu of income tax withholding on vesting of restricted stock units (3) (110)
Payments for deferred financing costs & termination fees (320) (208)
Proceeds from the Iliad Note 0 1,115
Payments on the Iliad Note (1,306) 0
Proceeds from convertible notes 0 1,700
Net cash provided by financing activities 4,160 1,094
Effect of exchange rate changes on cash 0 16
Net increase (decrease) in cash and restricted cash 1,486 (5,643)
Cash and restricted cash, beginning of year 692 6,335
Cash and restricted cash, end of year 2,178 692
Classification of cash and restricted cash:    
Cash and restricted cash 2,178 6,335
Supplemental information:    
Cash paid in year for interest 269 215
Cash paid in year for income taxes 4 15
Austin Credit Facility    
Cash flows from financing activities:    
Net proceeds from (payment on) credit line borrowings (719) (1,400)
Credit Facilities    
Cash flows from financing activities:    
Net proceeds from (payment on) credit line borrowings $ 2,459 $ 0