Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Cash flows from operating activities:
Consolidated net loss	$ (30,835)	$ (25,974)
Adjustments to reconcile consolidated net loss to net cash used in operating activities:
Depreciation	644	793
Impairment of fixed assets	242	0
Increase in fair value of Symphony Icon, Inc. purchase liability	1,142	1,264
Stock-based compensation	2,250	2,109
Gain on disposal of property and equipment	(264)	0
Changes in operating assets and liabilities:
Decrease in accounts receivable	319	515
Increase in prepaid expenses and other current assets	(1,934)	(2,089)
Decrease in other assets	11	21
Decrease in accounts payable and other liabilities	(1,876)	(905)
Decrease in deferred revenue	(18)	(5)
Net cash used in operating activities	(30,319)	(24,271)
Cash flows from investing activities:
Purchases of property and equipment	(28)	(839)
Proceeds from disposal of property and equipment	809	57
Purchases of investments	(20,651)	(80,954)
Maturities of investments	60,438	110,843
Net cash provided by investing activities	40,568	29,107
Cash flows from financing activities:
Proceeds from issuance of common stock	76	249
Repurchase of common stock	(887)	(873)
Repayment of debt borrowings	(420)	(387)
Net cash used in financing activities	(1,231)	(1,011)
Net increase in cash and cash equivalents	9,018	3,825
Cash and cash equivalents at beginning of period	37,499	30,423
Cash and cash equivalents at end of period	46,517	34,248
Supplemental disclosure of cash flow information:
Cash paid for interest	447	480
Supplemental disclosure of non-cash investing and financing activities:
Unrealized gain on investments	$ 8	$ 19