Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Cash flows from operating activities:
Consolidated net loss	$ (56,863)	$ (55,054)
Adjustments to reconcile consolidated net loss to net cash used in operating activities:
Depreciation	1,198	1,618
Impairment of fixed assets	242	0
Increase in fair value of Symphony Icon, Inc. purchase liability	1,590	1,741
Stock-based compensation	4,090	3,978
Gain on disposal of property and equipment	(733)	0
Changes in operating assets and liabilities:
Decrease in accounts receivable	509	364
Increase in prepaid expenses and other current assets	(2,706)	(335)
Decrease in other assets	51	44
Increase in accounts payable and other liabilities	2,692	2,251
Decrease in deferred revenue	(44)	(10)
Net cash used in operating activities	(49,974)	(45,403)
Cash flows from investing activities:
Purchases of property and equipment	(39)	(1,238)
Proceeds from disposal of property and equipment	1,517	102
Purchases of investments	(20,651)	(80,954)
Maturities of investments	60,964	121,623
Net cash provided by investing activities	41,791	39,533
Cash flows from financing activities:
Proceeds from issuance of common stock	162	347
Repurchase of common stock	(887)	(873)
Repayment of debt borrowings	(839)	(773)
Other financing activities	(27)	0
Net cash used in financing activities	(1,591)	(1,299)
Net decrease in cash and cash equivalents	(9,774)	(7,169)
Cash and cash equivalents at beginning of period	37,499	30,423
Cash and cash equivalents at end of period	27,725	23,254
Supplemental disclosure of cash flow information:
Cash paid for interest	896	962
Supplemental disclosure of non-cash investing and financing activities:
Unrealized gain on investments	$ 3	$ 8