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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Cash flows from operating activities:            
Net loss $ (1,642) $ (541)        
Adjustments to reconcile net loss to net cash used in (provided by) operating activities:            
Gain on forgiveness of PPP loan (801) 0        
Depreciation 47 46        
Stock-based compensation 140 20        
Change in fair value of warrant liabilities 0 (873)        
Provision for doubtful accounts receivable 6 (12)        
Provision for slow-moving and obsolete inventories 89 (78)        
Provision for warranties 12 44        
Amortization of loan discounts and origination fees 38 38        
Changes in operating assets and liabilities (Sources / (Uses) of cash):            
Accounts receivable 532 445        
Inventories (1,963) 1,546        
Short-term deposits 12 (240)        
Prepaid and other assets 4 53        
Accounts payable 951 (152)        
Accrued and other liabilities (209) 222        
Deferred revenue 1 (14)        
Total adjustments (1,141) 1,045        
Net cash (used in) provided by operating activities (2,783) 504        
Cash flows from investing activities:            
Acquisitions of property and equipment (109) (47)        
Net cash used in investing activities (109) (47)        
Cash flows from financing activities (Sources / (Uses) of cash):            
Proceeds from the issuance of common stock and warrants 0 2,750        
Proceeds from the exercise of warrants 527 0        
Offering costs paid on the issuance of common stock and warrants 0 (474) $ (510)      
Principal payments under finance lease obligations (1) (1)        
Common stock withheld in lieu of income tax withholding on vesting of restricted stock units (2) 0        
Payments on the Iliad Note 0 (226)        
Net cash provided by financing activities 1,604 2,104        
Net (decrease) increase in cash and restricted cash (1,288) 2,561        
Cash and restricted cash, beginning of period 2,178 692 692      
Cash and restricted cash, end of period 890 3,253 2,178      
Classification of cash and restricted cash:            
Cash       $ 548 $ 1,836 $ 2,911
Restricted cash held in other assets       342   342
Cash and restricted cash 890 3,253 $ 692 $ 890 $ 2,178 $ 3,253
Austin Credit Facility            
Cash flows from financing activities (Sources / (Uses) of cash):            
Net proceeds from (payment on) credit line borrowings 0 55        
Credit Facilities            
Cash flows from financing activities (Sources / (Uses) of cash):            
Net proceeds from (payment on) credit line borrowings $ 1,080 $ 0