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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2018 | Sep. 30, 2017
Cash flows from operating activities |  |
Net loss | $ (12,140) | $ (18,134)
Adjustments to reconcile net loss to net cash used in operating activities |  |
Depreciation and amortization | 536 | 817
Change in allowance for doubtful accounts | (3) | 8
Stock-based compensation | 1,081 | 1,038
Change in fair value of redeemable convertible preferred stock warrants | 681 | (235)
Loss on write-off of property and equipment | 95 | 172
Amortization of debt discount | 194 | 235
Write-off of public offering costs | 0 | 1,292
Forgiveness of notes receivable | 0 | 437
Changes in operating assets and liabilities |  |
Accounts receivable | 357 | (405)
Inventory | (458) | (1,146)
Prepaid expenses and other assets | 495 | (43)
Accounts payable | (884) | 1,447
Accrued liabilities and other | 1,844 | 1,023
Net cash used in operating activities | (8,202) | (13,494)
Cash flows from investing activities |  |
Purchase of property and equipment | (777) | (370)
Net cash used in investing activities | (777) | (370)
Cash flows from financing activities |  |
Proceeds from the exercise of common stock options, net | 915 | 176
Proceeds from the issuance of redeemable convertible preferred stock, net | 0 | 5,426
Payments of public offering costs | (288) | (1,292)
Net cash provided by financing activities | 627 | 4,310
Effect of exchange rate changes on cash and cash equivalents | (52) | 154
Net decrease in cash and cash equivalents | (8,404) | (9,400)
Cash and cash equivalents at |  |
Beginning of period | 22,408 | 27,900
End of period | 14,004 | 18,500
Supplemental disclosure of cash flow information |  |
Cash paid for interest | 3,147 | 2,473
Supplemental disclosure of noncash information |  |
Vesting of early exercised stock options | 64 | 91
Purchases of property and equipment included in accounts payable and accrued liabilities | 35 | 10
Public offering costs included in accounts payable and accrued liabilities | $ 865 | $ 0

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