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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Operating Activities |  |  |
Net (loss) income | $ (12,951) | $ (92) | $ 4,522
Adjustments to reconcile net (loss) income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 6,264 | 5,482 | 4,722
Loss on disposal of fixed assets | 156 | 6 | 40
Stock-based compensation | 25,704 | 17,592 | 8,786
Change in fair value of stock warrant liability |  |  | (43)
Unrealized foreign currency losses (gains) | 1,647 | (951) | 368
Amortization of (discount) premium on short-term investments | (295) | 20 | 210
Deferred rent and other liabilities | 1,919 | 722 | (31)
Changes in operating assets and liabilities: |  |  |
Accounts receivable, net | (2,252) | (2,181) | (6,791)
Inventory, net | (2,303) | (4,162) | (2,935)
Prepaid expenses and other current assets | (1,756) | 494 | (1,762)
Accounts payable and accrued liabilities | 2,527 | 9,741 | 5,096
Deferred tax asset and receivable, net |  | (235) |
Other assets | 204 | (345) | 127
Net cash provided by operating activities | 18,864 | 26,091 | 12,309
Investing activities |  |  |
Purchases of property and equipment | (10,315) | (6,311) | (6,278)
Purchases of short-term investments | (93,696) | (94,307) | (75,192)
Proceeds from sales and maturities of short-term investments | 78,851 | 88,891 | 55,354
Investment in company-owned life insurance | (1,240) | (663) |
Net cash used in investing activities | (26,400) | (12,390) | (26,116)
Financing activities |  |  |
Proceeds from exercise of stock options | 18,654 | 3,699 | 6,059
Share purchases under Employee Stock Purchase Plan | 3,509 | 968 | 1,945
Payments of employee taxs related to vested restricted stock units | (587) |  |
Payments of subordinated notes |  |  | (9,696)
Proceeds from exercise of stock warrants |  |  | 50
Net cash provided by (used in) financing activities | 21,576 | 4,667 | (1,642)
Effect of exchange rate changes on cash and cash equivalents | 48 | (434) | 371
Net increase (decrease) in cash, cash equivalents and restricted cash | 14,088 | 17,934 | (15,078)
Cash, cash equivalents and restricted cash at beginning of period | 24,508 | 6,574 | 21,652
Cash, cash equivalents and restricted cash at end of period | 38,596 | 24,508 | 6,574
Supplemental disclosures of cash flow information |  |  |
Taxes paid, net of refunds | $ 401 | 12 | 513
Interest paid |  |  | 285
Supplemental schedule of noncash investing and financing activities |  |  |
Reduction of liability upon vesting of stock options previously exercised for unvested stock |  | $ 4 | $ 62

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