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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Cash flows from operating activities: |  |
Net loss | $ (3,900) | $ (9,535)
Adjustments to reconcile net loss to net cash provided by operating activities: |  |
Depreciation and amortization | 2,202 | 1,906
Stock-based compensation | 4,316 | 4,612
Other non-cash items | (278) | 276
Changes in operating assets and liabilities: |  |
Accounts receivable, net | 5,214 | 15,641
Inventory | (2,222) | 772
Prepaid expenses and other assets | (1,699) | (1,167)
Accounts payable | (1,624) | (824)
Accrued liabilities | (1,647) | (3,351)
Deferred revenue | 197 | 2,039
Other | (14) | 69
Net cash provided by operating activities | 545 | 10,438
Cash flows from investing activities: |  |
Purchases of marketable securities | (18,616) | (69,530)
Proceeds from sales and maturities of marketable securities | 18,314 | 214
Purchases of property and equipment | (678) | (1,388)
Net cash used in investing activities | (980) | (70,704)
Cash flows from financing activities: |  |
Proceeds from issuance of common stock under employee equity incentive plans, net of repurchases | 2,065 | 370
Other | (25) | (25)
Net cash provided by financing activities | 2,040 | 345
Net increase (decrease) in cash and cash equivalents | 1,605 | (59,921)
Cash and cash equivalents - beginning of period | 28,975 | 98,117
Cash and cash equivalents - end of period | 30,580 | 38,196
Non-cash investing and financing activities: |  |
Inventory transfers to property and equipment | 783 | 345
Purchases of property and equipment included in accounts payable | 458 | 364
Vesting of early exercised stock options | $ 41 | $ 0

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