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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Operating activities |  |  |
Net loss | $ (19,626) | $ (58,528) | $ (20,140)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities: |  |  |
Depreciation and amortization expense | 7,228 | 7,608 | 2,863
Share-based compensation | 14,744 | 12,165 | 7,847
Changes in operating assets and liabilities: |  |  |
Accounts receivable | (10,878) | (1,540) | 1,711
Prepaid expenses | 332 | (1,677) | 2,405
Restricted cash | 0 | 0 | 300
Other assets | 262 | 276 | (285)
Accounts payable | (1,544) | 2,232 | (163)
Accrued expenses | 12,832 | 4,659 | 3,545
Lease exit liability | (1,593) | (2,822) | (3,293)
Deferred revenue | 6,533 | (4,191) | (12,223)
Deferred rent | 6,115 | (1,134) | 4,650
Other liabilities | 0 | (727) | (878)
Net cash provided by (used in) operating activities | 14,405 | (43,679) | (13,661)
Cash flows from investing activities |  |  |
Purchases of marketable securities | (135,122) | (347,762) | (142,910)
Proceeds from sales and maturities of marketable securities | 242,401 | 288,894 | 0
Purchases of property, equipment and software | (29,403) | (11,381) | (9,197)
Net cash provided by (used in) investing activities | 77,876 | (70,249) | (152,107)
Cash flows from financing activities |  |  |
Proceeds from issuance of common stock, net of offering costs | 34,244 | 0 | 203,467
Proceeds from stock option exercises and ESPP purchases | 1,144 | 1,893 | 911
Purchase of treasury stock | (40) | (39) | (29)
Net cash provided by financing activities | 35,348 | 1,854 | 204,349
Net change in cash and cash equivalents | 127,629 | (112,074) | 38,581
Cash and cash equivalents at beginning of period | 84,098 | 196,172 | 157,591
Cash and cash equivalents at end of period | $ 211,727 | $ 84,098 | $ 196,172

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