Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash flows from operating activities:
Net loss	$ (34,891)	$ (34,883)
Adjustments to reconcile consolidated net loss to net cash used in operating activities:
Depreciation and amortization	634	521
Increase in fair value of Symphony Icon, Inc. purchase liability	2,101	965
Stock-based compensation	2,231	1,835
Amortization of debt issuance costs	110	125
Deferred tax benefit	(8,652)	0
Loss on disposal of property and equipment	0	12
Changes in operating assets and liabilities:
(Increase) decrease in accounts receivable	(1,241)	170
Increase in inventory	(236)	0
Increase in prepaid expenses and other current assets	(6,498)	(4,134)
Decrease in other assets	33	0
Increase (decrease) in accounts payable and other liabilities	(24,703)	3,836
Decrease in deferred revenue	(14,384)	(12,187)
Net cash used in operating activities	(85,496)	(43,740)
Cash flows from investing activities:
Purchases of property and equipment	(92)	(54)
Purchases of investments	(60,905)	(208,986)
Maturities of investments	103,452	75,400
Net cash provided by (used in) investing activities	42,455	(133,640)
Cash flows from financing activities:
Proceeds from issuance of common stock	1,111	184
Repurchase of common stock	(1,679)	(621)
Repayment of debt borrowings	(536)	(491)
Net cash used in financing activities	(1,104)	(928)
Net decrease in cash and cash equivalents	(44,145)	(178,308)
Cash and cash equivalents at beginning of period	46,600	202,989
Cash and cash equivalents at end of period	2,455	24,681
Supplemental disclosure of cash flow information:
Cash paid for interest	332	378
Supplemental disclosure of non-cash investing and financing activities:
Common stock issued in satisfaction of Symphony Icon payment obligation	10,499	0
Unrealized gain (loss) on investments	$ (69)	$ 516