Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Cash flows from operating activities:
Consolidated net loss	$ (86,712)	$ (85,338)
Adjustments to reconcile consolidated net loss to net cash used in operating activities:
Depreciation	2,194	3,274
Increase in fair value of Symphony Icon, Inc. purchase liability	3,079	10,087
Stock-based compensation	5,728	4,905
Changes in operating assets and liabilities:
Decrease in accounts receivable	483	117
Increase in prepaid expenses and other current assets	(908)	(5,256)
Decrease in other assets	62	70
Increase (decrease) in accounts payable and other liabilities	6,684	(1,887)
Increase in deferred revenue	52	0
Net cash used in operating activities	(69,338)	(74,028)
Cash flows from investing activities:
Purchases of property and equipment	(1,506)	(379)
Proceeds from disposal of property and equipment	108	7
Purchases of investments	(80,954)	(151,776)
Maturities of investments	142,125	61,070
Net cash provided by (used in) investing activities	59,773	(91,078)
Cash flows from financing activities:
Proceeds from issuance of common stock	874	1,055
Repurchase of common stock	(873)	(285)
Repayment of debt borrowings	(1,167)	(1,068)
Other financing activities	(111)	(146)
Net cash used in financing activities	(1,277)	(444)
Net decrease in cash and cash equivalents	(10,842)	(165,550)
Cash and cash equivalents at beginning of period	30,423	186,309
Cash and cash equivalents at end of period	19,581	20,759
Supplemental disclosure of cash flow information:
Cash paid for interest	1,437	1,535
Supplemental disclosure of non-cash investing and financing activities:
Common stock issued in satisfaction of Symphony Icon base payment obligation	0	35,000
Unrealized gain on investments	$ 15	$ 0