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CONDENSED CONSOLIDATED STATEMENT OF CASH FLOWS (UNAUDITED) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Cash flows from operating activities:    
Net loss $ (7,212) $ (9,280)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 190 554
Stock-based compensation 283 296
Amortization of lease liability and lease interest expense (199)  
Loss on disposal of asset   18
Deferred income taxes   (3)
Bad debt repayment 2  
Changes in operating assets and liabilities:    
Accounts receivable 378 (1,229)
Non-trade receivable (1,730)  
Inventory 324 779
Prepaid expenses and other current assets 2,295 1,496
Other assets 592 (278)
Accounts payable 3,966 2,338
Accrued expenses 369 (2,896)
Warranty liability (54)  
Deferred revenue 161 (5)
Income tax payable 26 13
Net cash used in operating activities: (609) (8,197)
Cash flows from investing activities:    
Purchase of property and equipment (3)  
Net cash used in investing activities (3)  
Cash flows from financing activities:    
Repayment of current portion of long-term debt 36 37
Proceeds from issuance of common stock, net of costs 45  
Proceeds from exercise of stock options   5
Net cash provided by (used in) financing activities 9 (32)
Net increase (decrease) in cash and cash equivalents (603) (8,229)
Cash and cash equivalents at beginning of period 11,233 22,141
Cash and cash equivalents at end of period 10,630 13,912
Supplemental disclosure of cash flow information:    
Cash paid for interest 39 $ 37
Cash paid for income taxes 1  
Non-cash financing activities:    
Shares issued under bonus plans $ 253  

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