Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flows from operating activities:
Net loss	$ (42,075)	$ (34,891)
Adjustments to reconcile consolidated net loss to net cash used in operating activities:
Depreciation and amortization	925	634
Increase in fair value of Symphony Icon, Inc. purchase liability	0	2,101
Stock-based compensation	3,074	2,231
Amortization of Debt Issuance Costs and Discounts	307	110
Deferred tax benefit	0	(8,652)
Changes in operating assets and liabilities:
(Increase) decrease in accounts receivable	343	(1,241)
Increase in inventory	(164)	(236)
(Increase) decrease in prepaid expenses and other current assets	150	(6,498)
(Increase) decrease in other assets	(3)	33
Increase (decrease) in accounts payable and other liabilities	9,469	(24,703)
Decrease in deferred revenue	(18,801)	(14,384)
Net cash used in operating activities	(46,775)	(85,496)
Cash flows from investing activities:
Purchases of property and equipment	(40)	(92)
Purchases of investments	(46,892)	(60,905)
Maturities of investments	53,995	103,452
Net cash provided by investing activities	7,063	42,455
Cash flows from financing activities:
Proceeds from issuance of common stock	25	1,111
Repurchase of common stock	(972)	(1,679)
Repayment of debt borrowings	(581)	(536)
Net cash used in financing activities	(1,528)	(1,104)
Net increase (decrease) in cash and cash equivalents	(41,240)	(44,145)
Cash and cash equivalents at beginning of period	61,661	46,600
Cash and cash equivalents at end of period	20,421	2,455
Supplemental disclosure of cash flow information:
Cash paid for interest	774	332
Supplemental disclosure of non-cash investing and financing activities:
Common stock issued in satisfaction of Symphony Icon payment obligation	0	10,499
Unrealized loss on investments	(172)	(69)
Accumulated Deficit
Cash flows from operating activities:
Net loss	$ (42,075)	(34,891)
Supplemental disclosure of non-cash investing and financing activities:
Common stock issued in satisfaction of Symphony Icon payment obligation		$ 0