Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash flows from operating activities:
Net loss	$ 130,133	$ (120,548)	$ (122,993)
Adjustments to reconcile consolidated net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	3,654	3,683	3,399
Increase in fair value of Symphony Icon, Inc. purchase liability	0	0	2,101
Stock-based compensation	14,218	11,696	9,472
Loss on disposal of property and equipment	0	0	3
Amortization of debt issuance costs	1,465	1,336	599
Deferred tax benefit	(6,014)	0	(12,661)
Changes in operating assets and liabilities:
(Increase) decrease in accounts receivable	(50,608)	(1,099)	166
Increase in inventories	437	(2,732)	(1,948)
(Increase) decrease in prepaid expenses and other current assets	(2,652)	1,766	(557)
(Increase) decrease in other assets	429	144	33
Increase (decrease) in accounts payable and other liabilities	20,097	(19,913)	(11,875)
Decrease in deferred revenue	(25,990)	(22,940)	(51,133)
Net cash used in operating activities	113,807	(148,607)	(185,394)
Cash flows from investing activities:
Purchases of property and equipment	(70)	(95)	(228)
Purchases of investments	(322,385)	(119,987)	(267,873)
Maturities of investments	166,600	289,658	318,623
Net cash provided by investing activities	(155,855)	169,576	50,522
Cash flows from financing activities:
Proceeds from issuance of common stock, net of fees	0	732	7,987
Repurchase of common stock	(941)	(972)	(1,679)
Proceeds from debt borrowings, net of fees	0	12,529	145,905
Repayment of debt borrowings	(1,285)	(14,533)	(2,280)
Net cash provided by (used in) financing activities	(2,226)	(2,244)	149,933
Net increase (decrease) in cash and cash equivalents	(44,274)	18,725	15,061
Cash and cash equivalents at beginning of year	80,386	61,661	46,600
Cash and cash equivalents at end of year	36,112	80,386	61,661
Supplemental disclosure of cash flow information:
Cash paid for interest	19,211	16,465	5,870
Supplemental disclosure of noncash investing and financing activities:
Common stock issued in satisfaction of Symphony Icon base payment obligation	$ 0		$ 10,499
Symphony Contingent Payment In Cash		$ 0