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v3.20.2

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2020 | Jun. 30, 2019
Cash flows from operating activities |  |
Net loss | $ (91,609) | $ (76,784)
Adjustments to reconcile net loss to net cash used in operating activities: |  |
Depreciation expense | 6,105 | 6,181
Amortization of premiums and discounts on marketable securities | (401) | (698)
Stock-based compensation | 9,587 | 8,683
Changes in operating assets and liabilities: |  |
Accounts receivable | (6,461) | 23,971
Prepaid expenses and other current assets | 3,093 | (3,209)
Other assets | 995 | (21,091)
Accounts payable | (1,476) | (2,598)
Accrued expenses | 3,337 | (2,663)
Lease liabilities | (1,534) | 231
Deferred revenue | (3,767) | (10,861)
Other liabilities | 1,443 | 0
Net cash used in operating activities | (80,688) | (78,838)
Cash flows from investing activities |  |
Purchases of marketable securities | (72,199) | (142,305)
Proceeds from sale and maturities of marketable securities | 125,617 | 63,955
Purchases of property and equipment | (1,847) | (2,262)
Net cash provided by (used in) investing activities | 51,571 | (80,612)
Cash flows from financing activities |  |
Proceeds from issuance of common stock, net of offering costs | 96,512 | 118,657
Proceeds from stock option exercises and ESPP purchases | 2,665 | 981
Net cash provided by financing activities | 99,177 | 119,638
Net change in cash and cash equivalents | 70,060 | (39,812)
Cash and cash equivalents at beginning of period | 126,472 | 220,128
Cash and cash equivalents at end of period | 196,532 | 180,316
Supplemental Cash Flow Information [Abstract] |  |
Right-of-use assets modified in exchange for operating lease obligations | $ 0 | $ 1,988

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