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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash flows from operating activities:      
Net loss $ (120,548) $ (122,993) $ (131,445)
Adjustments to reconcile consolidated net loss to net cash provided by (used in) operating activities:      
Depreciation and amortization 3,683 3,399 2,056
Increase (decrease) in fair value of Symphony Icon, Inc. purchase liability 0 2,101 (703)
Stock-based compensation 11,696 9,472 7,452
Loss on disposal of property and equipment 0 3 16
Amortization of debt issuance costs 1,336 599 527
Deferred tax benefit 0 (12,661) 0
Changes in operating assets and liabilities:      
(Increase) decrease in accounts receivable (1,099) 166 (4,080)
Increase in inventories (2,732) (1,948) 0
(Increase) decrease in prepaid expenses and other current assets 1,766 (557) 6,259
(Increase) decrease in other assets 144 33 (32)
Increase (decrease) in accounts payable and other liabilities (18,857) (11,875) 13,584
Decrease in deferred revenue (23,996) (51,133) (69,262)
Net cash used in operating activities (148,607) (185,394) (175,628)
Cash flows from investing activities:      
Purchases of property and equipment (95) (228) (231)
Purchases of investments (119,987) (267,873) (425,673)
Maturities of investments 289,658 318,623 444,156
Net cash provided by investing activities 169,576 50,522 18,252
Cash flows from financing activities:      
Proceeds from issuance of common stock, net of fees 732 7,987 3,624
Repurchase of common stock (972) (1,679) (621)
Proceeds from debt borrowings, net of fees 12,529 145,905 0
Repayment of debt borrowings (14,533) (2,280) (2,016)
Net cash provided by (used in) financing activities (2,244) 149,933 987
Net increase (decrease) in cash and cash equivalents 18,725 15,061 (156,389)
Cash and cash equivalents at beginning of year 61,661 46,600 202,989
Cash and cash equivalents at end of year 80,386 61,661 46,600
Supplemental disclosure of cash flow information:      
Cash paid for interest 16,465 5,870 6,050
Supplemental disclosure of noncash investing and financing activities:      
Unrealized gain (loss) on investments 210 (27) 24
Common stock issued in satisfaction of Symphony Icon base payment obligation $ 0   $ 0
Symphony Contingent Payment In Cash   $ 10,499