Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Cash flows from operating activities:
Consolidated net loss	$ (25,974)	$ (29,868)
Adjustments to reconcile consolidated net loss to net cash used in operating activities:
Depreciation	793	1,125
Increase in fair value of Symphony Icon, Inc. purchase liability	1,264	2,081
Stock-based compensation	2,109	1,718
Changes in operating assets and liabilities:
Decrease in accounts receivable	515	164
Increase in prepaid expenses and other current assets	(2,089)	(1,395)
Decrease in other assets	21	24
Decrease in accounts payable and other liabilities	(905)	(851)
Decrease in deferred revenue	(5)	0
Net cash used in operating activities	(24,271)	(27,002)
Cash flows from investing activities:
Purchases of property and equipment	(839)	(234)
Proceeds from disposal of property and equipment	57	0
Purchases of investments	(80,954)	(151,776)
Maturities of investments	110,843	22,435
Net cash provided by (used in) investing activities	29,107	(129,575)
Cash flows from financing activities:
Proceeds from issuance of common stock	249	52
Repurchase of common stock	(873)	(285)
Repayment of debt borrowings	(387)	(353)
Other financing activities	0	(136)
Net cash used in financing activities	(1,011)	(722)
Net increase (decrease) in cash and cash equivalents	3,825	(157,299)
Cash and cash equivalents at beginning of period	30,423	186,309
Cash and cash equivalents at end of period	34,248	29,010
Supplemental disclosure of cash flow information:
Cash paid for interest	480	516
Supplemental disclosure of non-cash investing and financing activities:
Unrealized gain (loss) on investments	$ 19	$ (78)