Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities:
Consolidated net loss	$ (28,076)	$ (30,835)
Adjustments to reconcile consolidated net loss to net cash used in operating activities:
Depreciation	355	644
Impairment of fixed assets	0	242
Increase in fair value of Symphony Icon, Inc. purchase liability	1,753	1,142
Stock-based compensation	1,953	2,250
Amortization of debt issuance costs	62	0
(Gain) loss on disposal of property and equipment	6	(264)
Changes in operating assets and liabilities:
Decrease in accounts receivable	865	319
(Increase) decrease in prepaid expenses and other current assets	1,570	(1,934)
(Increase) decrease in other assets	(393)	11
Decrease in accounts payable and other liabilities	(1,302)	(1,876)
Decrease in deferred revenue	(278)	(18)
Net cash used in operating activities	(23,485)	(30,319)
Cash flows from investing activities:
Purchases of property and equipment	(17)	(28)
Proceeds from disposal of property and equipment	4	809
Purchases of investments	(70,978)	(20,651)
Maturities of investments	0	60,438
Net cash provided by (used in) investing activities	(70,991)	40,568
Cash flows from financing activities:
Proceeds from issuance of common stock	0	76
Repurchase of common stock	(357)	(887)
Repayment of debt borrowings	(456)	(420)
Other financing activities	(17)	0
Net cash used in financing activities	(830)	(1,231)
Net increase (decrease) in cash and cash equivalents	(95,306)	9,018
Cash and cash equivalents at beginning of period	137,266	37,499
Cash and cash equivalents at end of period	41,960	46,517
Supplemental disclosure of cash flow information:
Cash paid for interest	412	447
Supplemental disclosure of non-cash investing and financing activities:
Unrealized gain on investments	$ 86	$ 8