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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2017 | Sep. 30, 2016
Cash flows from operating activities: |  |
Net loss | $ (14,825) | $ (19,154)
Adjustments to reconcile net loss to net cash provided by operating activities: |  |
Depreciation and amortization | 6,222 | 5,919
Stock-based compensation | 13,824 | 13,069
Other non-cash items | 930 | 1,798
Changes in operating assets and liabilities: |  |
Accounts receivable, net | 16,049 | 7,311
Inventory | (3,242) | 2,303
Prepaid expenses and other assets | (2,870) | 349
Accounts payable | (1,243) | (878)
Accrued liabilities | (3,023) | 906
Deferred revenue | (1,904) | 10,440
Other | 102 | (224)
Net cash provided by operating activities | 10,020 | 21,839
Cash flows from investing activities: |  |
Purchases of marketable securities | (69,580) | (109,268)
Proceeds from sales and maturities of marketable securities | 70,866 | 23,787
Payment for acquisition | 0 | (4,380)
Purchases of property and equipment | (4,223) | (4,256)
Purchase of intangible asset | 0 | (1,500)
Net cash used in investing activities | (2,937) | (95,617)
Cash flows from financing activities: |  |
Proceeds from issuance of common stock under employee equity incentive plans | 7,665 | 7,116
Repurchases and retirement of common stock | (3,071) | 0
Payment of contingent consideration | (650) | 0
Other | (83) | (75)
Net cash provided by financing activities | 3,861 | 7,041
Net increase (decrease) in cash and cash equivalents | 10,944 | (66,737)
Cash and cash equivalents - beginning of period | 28,975 | 98,117
Cash and cash equivalents - end of period | 39,919 | 31,380
Non-cash investing and financing activities: |  |
Common stock issued under asset purchase agreement | 0 | 1,313
Inventory transfers to property and equipment | 2,368 | 1,451
Purchases of property and equipment included in accounts payable | $ 65 | $ 275

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Balance Type: | credit
Period Type: | duration