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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Cash flows from operating activities:    
Net loss $ (541) $ (2,865)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:    
Depreciation 46 105
Stock-based compensation 20 543
Change in fair value of warrant liabilities (873) 0
Provision for doubtful accounts receivable (12) 26
Provision for slow-moving and obsolete inventories (34) (836)
Provision for warranties 0 101
Amortization of loan discounts and origination fees 38 20
Gain on dispositions of property and equipment 0 (1)
Changes in operating assets and liabilities:    
Accounts receivable 445 (210)
Inventories 1,546 643
Prepaid and other assets (187) 459
Accounts payable (152) (1,329)
Accrued and other liabilities 222 (195)
Deferred revenue (14) (17)
Total adjustments 1,045 (691)
Net cash provided by (used in) operating activities 504 (3,556)
Cash flows from investing activities:    
Acquisitions of property and equipment (47) (5)
Proceeds from the sale of property and equipment 0 1
Net cash used in investing activities (47) (4)
Cash flows from financing activities:    
Proceeds from the issuance of common stock and warrants 2,750  
Offering costs paid on the issuance of common stock and warrants (474)  
Principal payments under finance lease obligations (1) (1)
Common stock withheld in lieu of income tax withholding on vesting of restricted stock units 0 (111)
Payments on the Iliad Note (226) 0
Net proceeds from (payment on) credit line borrowings 55 (462)
Proceeds from convertible notes 0 1,660
Net cash provided by financing activities 2,104 1,086
Net increase (decrease) in cash and restricted cash 2,561 (2,474)
Cash and restricted cash, beginning of period 692 6,335
Cash and restricted cash, end of period 3,253 3,861
Classification of cash and restricted cash:    
Cash and restricted cash $ 3,253 $ 3,861