Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash flows from operating activities:
Consolidated net loss	$ (4,682)	$ (100,294)	$ (104,126)
Adjustments to reconcile consolidated net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	727	1,928	2,863
Impairment of assets	3,597	13,544	0
Increase (decrease) in fair value of Symphony Icon, Inc. purchase liability	5,927	1,428	(2,210)
Stock-based compensation	6,843	7,081	7,421
Gain on disposal of property and equipment	(47)	(1,631)	0
Amortization of debt issuance costs	520	100	0
Deferred tax benefit	0	(70)	0
Changes in operating assets and liabilities:
Decrease in accounts receivable	124	457	588
(Increase) decrease in prepaid expenses and other current assets	(5,373)	(128)	1,713
Increase in other assets	(416)	0	(9)
Increase in accounts payable and other liabilities	6,203	1,266	3,119
Increase (decrease) in deferred revenue	171,353	697	(438)
Net cash provided by (used in) operating activities	184,776	(75,622)	(91,079)
Cash flows from investing activities:
Purchases of property and equipment	(910)	(80)	(1,721)
Proceeds from disposal of property and equipment	335	2,170	130
Purchases of investments	(326,446)	(221,953)	(111,490)
Maturities of investments	210,000	111,444	212,625
Net cash provided by (used in) investing activities	(117,021)	(108,419)	99,544
Cash flows from financing activities:
Proceeds from issuance of common stock, net of fees	114	202,270	1,084
Repurchase of common stock	(357)	(887)	(873)
Proceeds from debt borrowings, net of fees	0	84,135	0
Repayment of debt borrowings	(1,859)	(1,710)	(1,574)
Other financing activities	70	0	(26)
Net cash provided by (used in) financing activities	(2,032)	283,808	(1,389)
Net increase in cash and cash equivalents	65,723	99,767	7,076
Cash and cash equivalents at beginning of year	137,266	37,499	30,423
Cash and cash equivalents at end of year	202,989	137,266	37,499
Supplemental disclosure of cash flow information:
Cash paid for interest	6,270	1,761	1,897
Supplemental disclosure of noncash investing and financing activities:
Unrealized loss on investments	(156)	(65)	(21)
Common stock issued in satisfaction of Symphony Icon base payment obligation	$ 0	$ 5,750	$ 0