XML 14 R6.htm IDEA: XBRL DOCUMENT v3.19.3
CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Cash flows from operating activities    
Net loss $ (121,415) $ (126,809)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization expense 8,119 5,268
Stock-based compensation 14,081 12,168
Changes in operating assets and liabilities:    
Accounts receivable 20,080 (7,328)
Prepaid expenses (5,612) (1,164)
Other assets (2,621) (9,293)
Accounts payable (913) (1,465)
Accrued expenses (4,678) 9,460
Lease exit liability 0 (298)
Deferred revenue (7,114) (5,807)
Lease liabilities 3,847 0
Deferred rent 0 (738)
Net cash used in operating activities (96,226) (126,006)
Cash flows from investing activities    
Purchases of marketable securities (214,178) (120,039)
Proceeds from sale and maturities of marketable securities 130,236 155,848
Purchases of property and equipment (3,042) (24,239)
Net cash provided by (used in) investing activities (86,984) 11,570
Cash flows from financing activities    
Proceeds from issuance of common stock, net of offering costs 118,657 103,259
Proceeds from stock option exercises and ESPP purchases 1,018 1,257
Net cash provided by financing activities 119,675 104,516
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect, Total (63,535) (9,920)
Cash and cash equivalents at beginning of period 220,128 211,727
Cash and cash equivalents at end of period 156,593 201,807
Supplemental Cash Flow Information [Abstract]    
Right-of-use assets modified in exchange for operating lease obligations $ 6,408 $ 0