Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Cash flows from operating activities:
Consolidated net loss	$ (104,126)	$ (110,211)	$ (116,215)
Adjustments to reconcile consolidated net loss to net cash used in operating activities:
Depreciation	2,863	4,190	4,887
Impairment of fixed assets	0	0	704
Increase (decrease) in fair value of Symphony Icon, Inc. purchase liability	(2,210)	9,887	6,766
Stock-based compensation	7,421	6,495	5,707
Changes in operating assets and liabilities:
(Increase) decrease in accounts receivable	588	(1,028)	394
(Increase) decrease in prepaid expenses and other current assets	1,713	(2,601)	(865)
(Increase) decrease in other assets	(9)	96	414
Increase (decrease) in accounts payable and other liabilities	3,119	(995)	10,365
Decrease in deferred revenue	(438)	(293)	(95)
Net cash used in operating activities	(91,079)	(94,460)	(87,938)
Cash flows from investing activities:
Purchases of property and equipment	(1,721)	(492)	(1,206)
Proceeds from disposal of property and equipment	130	85	2,625
Purchases of investments	(111,490)	(233,250)	(108,092)
Maturities of investments	212,625	135,850	176,628
Net cash provided by (used in) investing activities	99,544	(97,807)	69,955
Cash flows from financing activities:
Proceeds from issuance of common stock, net of fees	1,084	38,109	160,781
Repurchase of common stock	(873)	(285)	(108)
Repayment of debt borrowings	(1,574)	(1,443)	(3,589)
Other financing activities	(26)	0	0
Net cash provided by (used in) financing activities	(1,389)	36,381	157,084
Net increase (decrease) in cash and cash equivalents	7,076	(155,886)	139,101
Cash and cash equivalents at beginning of year	30,423	186,309	47,208
Cash and cash equivalents at end of year	37,499	30,423	186,309
Supplemental disclosure of cash flow information:
Cash paid for interest	1,897	2,028	2,447
Supplemental disclosure of noncash investing and financing activities:
Unrealized gain (loss) on investments	(21)	2	16
Common stock issued in satisfaction of Symphony Icon base payment obligation	$ 0	$ 35,000	$ 0