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v3.20.2

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2020 | Sep. 30, 2019
Cash flows from operating activities |  |
Net loss | $ (127,652) | $ (121,415)
Adjustments to reconcile net loss to net cash used in operating activities: |  |
Depreciation expense | 9,067 | 9,238
Amortization of premiums and discounts on marketable securities | (387) | (1,119)
Stock-based compensation | 15,419 | 14,081
Changes in operating assets and liabilities: |  |
Accounts receivable | (6,033) | 20,080
Prepaid expenses and other current assets | 654 | (5,612)
Other assets | 1,615 | (2,621)
Accounts payable | 137 | (913)
Accrued expenses | 5,499 | (4,678)
Lease liabilities | (2,113) | 3,847
Deferred revenue | (4,816) | (7,114)
Other liabilities | 2,245 | 0
Net cash used in operating activities | (106,365) | (96,226)
Cash flows from investing activities |  |
Purchases of marketable securities | (151,230) | (214,178)
Proceeds from sale and maturities of marketable securities | 161,866 | 130,236
Purchases of property and equipment | (2,346) | (3,042)
Net cash provided by (used in) investing activities | 8,290 | (86,984)
Cash flows from financing activities |  |
Proceeds from issuance of common stock, net of offering costs | 170,494 | 118,657
Proceeds from stock option exercises and ESPP purchases | 4,757 | 1,018
Retirement Of Treasury Stock | (2,011) | 0
Net cash provided by financing activities | 173,240 | 119,675
Net change in cash and cash equivalents | 75,165 | (63,535)
Cash and cash equivalents at beginning of period | 126,472 | 220,128
Cash and cash equivalents at end of period | 201,637 | 156,593
Supplemental Cash Flow Information [Abstract] |  |
Right-of-use assets modified in exchange for operating lease obligations | $ 0 | $ 6,408

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Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_SupplementalCashFlowInformationAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration