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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Cash flow from operating activities:    
Net loss $ (6,663) $ (4,923)
Adjustments to reconcile net loss to net cash used for operating activities:    
Amortization 105 115
Depreciation 169 157
Non-cash lease expense 391 388
Bad debt provision 510 (3)
Stock-based compensation 964 1,446
Amortization of debt discount and debt costs 0 17
Loss on extinguishment of debt 0 386
Changes in operating assets and liabilities:    
Accounts receivable (1,790) (924)
Inventory (830) 284
Prepaid and other assets 853 122
Accounts payable (581) (1,829)
Accrued and other expenses (371) (432)
Lease liabilities (425) (304)
Deferred revenue 659 (77)
Total adjustments (346) (654)
Net cash used for operating activities (7,009) (5,577)
Cash flow from investing activities:    
Additions to patents, technology and other (10) 0
Additions to property and equipment (255) (336)
Net cash used for investing activities (265) (336)
Cash flow from financing activities:    
Proceeds from option exercises pursuant to stock option plans 79 636
Proceeds from issuance of common stock pursuant to Employee Stock Purchase Plans 93 114
Proceeds from issuance of common stock, net 0 23,229
Issuance of stock upon conversion of debentures 0 (7,363)
Net cash provided by financing activities 172 16,616
(Decrease) increase in cash and cash equivalents (7,102) 10,703
Cash and cash equivalents, beginning of period 34,282 27,186
Cash and cash equivalents, end of period 27,180 37,889
Supplemental disclosure of cash flow information:    
Interest paid 9 92
Amendment to right-of-use assets obtained in exchange for operating lease liabilities $ 2,434 $ 0