Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Cash flows from operating activities:
Net loss	$ (72,995)	$ (56,150)
Adjustments to reconcile consolidated net loss to net cash used in operating activities:
Depreciation and amortization	1,037	601
Increase in fair value of Symphony Icon, Inc. purchase liability	1,443	1,741
Stock-based compensation	3,792	3,741
Amortization of debt issuance costs	250	241
(Gain) loss on disposal of property and equipment	12	(59)
Changes in operating assets and liabilities:
(Increase) decrease in accounts receivable	(107)	719
(Increase) decrease in prepaid expenses and other current assets	1,066	(2,387)
Increase in other assets	0	(413)
Increase (decrease) in accounts payable and other liabilities	5,818	(3,326)
Decrease in deferred revenue	(31,934)	(371)
Net cash used in operating activities	(91,618)	(55,663)
Cash flows from investing activities:
Purchases of property and equipment	(67)	(480)
Proceeds from disposal of property and equipment	0	334
Purchases of investments	(219,437)	(70,505)
Maturities of investments	147,400	0
Net cash used in investing activities	(72,104)	(70,651)
Cash flows from financing activities:
Proceeds from issuance of common stock	752	0
Repurchase of common stock	(621)	(357)
Repayment of debt borrowings	(988)	(912)
Other financing activities	0	61
Net cash used in financing activities	(857)	(1,208)
Net decrease in cash and cash equivalents	(164,579)	(127,522)
Cash and cash equivalents at beginning of period	202,989	137,266
Cash and cash equivalents at end of period	38,410	9,744
Supplemental disclosure of cash flow information:
Cash paid for interest	3,046	3,184
Supplemental disclosure of non-cash investing and financing activities:
Unrealized gain on investments	$ 555	$ 161