Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash flows from operating activities:
Consolidated net loss	$ (129,050)	$ (141,429)	$ (4,682)
Adjustments to reconcile consolidated net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	3,399	2,056	727
Impairment of assets	0	0	3,597
Increase (decrease) in fair value of Symphony Icon, Inc. purchase liability	2,101	(703)	5,927
Stock-based compensation	9,472	7,452	6,843
(Gain) loss on disposal of property and equipment	3	16	(47)
Amortization of debt issuance costs	599	527	520
Deferred tax benefit	(12,661)	0	0
Changes in operating assets and liabilities:
(Increase) decrease in accounts receivable	166	(4,080)	124
Increase in inventories	(1,948)	0	0
(Increase) decrease in prepaid expenses and other current assets	(557)	6,259	(5,373)
(Increase) decrease in other assets	33	(32)	(416)
Increase (decrease) in accounts payable and other liabilities	(7,172)	27,650	6,203
Increase (decrease) in deferred revenue	(49,779)	(73,344)	171,353
Net cash provided by (used in) operating activities	(185,394)	(175,628)	184,776
Cash flows from investing activities:
Purchases of property and equipment	(228)	(231)	(910)
Proceeds from disposal of property and equipment	0	0	335
Purchases of investments	(267,873)	(425,673)	(326,446)
Maturities of investments	318,623	444,156	210,000
Net cash provided by (used in) investing activities	50,522	18,252	(117,021)
Cash flows from financing activities:
Proceeds from issuance of common stock, net of fees	7,987	3,624	114
Repurchase of common stock	(1,679)	(621)	(357)
Proceeds from debt borrowings, net of fees	145,905	0	0
Repayment of debt borrowings	(2,280)	(2,016)	(1,859)
Other financing activities	0	0	70
Net cash provided by (used in) financing activities	149,933	987	(2,032)
Net increase (decrease) in cash and cash equivalents	15,061	(156,389)	65,723
Cash and cash equivalents at beginning of year	46,600	202,989	137,266
Cash and cash equivalents at end of year	61,661	46,600	202,989
Supplemental disclosure of cash flow information:
Cash paid for interest	5,870	6,050	6,270
Supplemental disclosure of noncash investing and financing activities:
Unrealized gain (loss) on investments	(27)	24	(156)
Common stock issued in satisfaction of Symphony Icon base payment obligation	$ 10,499	$ 0	$ 0