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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2017 | Sep. 30, 2016
Cash flows from operating activities |  |
Net loss | $ (4,238) | $ (3,428)
Adjustments to reconcile net loss to net cash used in operating activities: |  |
Depreciation and amortization | 527 | 556
Provision for inventory obsolescence | 203 | 365
Gain on disposal of property and equipment, net | 3 | 19
Stock based compensation | 532 | 533
Change in fair value of derivative liabilities | (57) | 555
Provision for allowance for doubtful accounts | 128 | 126
Provision for deferred taxes | 0 | 25
Changes in current assets and liabilities: |  |
Trade receivables | 528 | (1,070)
Prepaid expenses | (221) | (48)
Inventories | (1,380) | (337)
Deposits and other assets | 9 | 312
Accounts payable | (219) | 436
Accrued and other liabilities | (250) | (337)
Net cash used in operating activities | (4,435) | (2,293)
Cash flows from investing activities |  |
Purchases of technology, property and equipment | (431) | (182)
Net cash used in investing activities | (431) | (182)
Cash flows from financing activities |  |
Proceeds from stock options/warrants exercised | 0 | 119
Change in restricted cash | 0 | 60
Repayment of mortgage note payable | (179) | (180)
Net cash used in financing activities | (179) | (1)
Net change in cash and cash equivalents | (5,045) | (2,476)
Cash and cash equivalents, beginning of period | 14,456 | 11,805
Cash and cash equivalents, end of period | 9,411 | 9,329
Cash paid for: |  |
Interest paid | $ 103 | $ 125

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