CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands		3 Months Ended			12 Months Ended
		Mar. 31, 2020	Mar. 31, 2019		Dec. 31, 2019
Cash flows from operating activities
Net (loss) income		$ (32,011)	$ 6,617
Less: (Loss) income from discontinued operations		(244)	15,069
Net loss from continuing operations		(31,767)	(8,452)
Adjustments to reconcile net loss to net cash used in operating activities:
Amortization of convertible notes conversion option and debt issuance costs		280	1,923
Accreted interest on convertible note principal		33	0
Amortization of intangible assets		302	318
Amortization of right-of-use assets		185	153
Change in fair value of equity affiliate		11,334	0
Change in fair value of derivative assets		2,453	33
Other amortization and depreciation		509	827
Loss on extinguishment of convertible notes		606	0
Loss on disposal of property and equipment		300	0
Provision for bad debts		50	0
Stock-based compensation expense		17,769	1,115
Deferred income taxes		(129)	(602)
Changes in assets and liabilities:
Accounts receivable		(1,245)	1,472
Prepaid and other current assets		(14,666)	1,048
Inventory		(3,900)	(788)
Other assets		0	173
Accounts payable		2,554	(65)
Accrued liabilities		(238)	570
Other long-term liabilities		316	(28)
Net cash used in operating activities - continuing operations		(15,254)	(2,303)
Net cash (used in) provided by operating activities - discontinued operations		(3,765)	6,818
Cash flows from investing activities
Purchase of property and equipment		(93)	(42)
Net cash used in investing activities - continuing operations		(93)	(42)
Net cash provided by investing activities - discontinued operations		13,569	12,620
Cash flows from financing activities
Repurchase of convertible notes		(18,845)	0		$ (97,900)
Net receipts for capped call transactions		801
Net receipts for capped call transactions			0
Payment of contingent consideration		0	(1,071)
Repurchase of Company common stock		(19,226)	(44,288)
Net settlement of stock-based compensation awards		(3,462)	0
Net cash used in financing activities - continuing operations		(40,732)	(45,359)
Net cash used in financing activities - discontinued operations		(359)	0
Net decrease in cash and cash equivalents		(46,634)	(28,266)
Cash and cash equivalents at beginning of the period		193,451	394,590	[1]	394,590	[1]
Cash and cash equivalents at end of the period		146,817	366,324		$ 193,451
Less: Cash and cash equivalents of discontinued operations		21,305	24,469
Cash and cash equivalents of continuing operations at end of period	[2]	125,512	341,855
Supplemental cash flow information
Cash (refunded) paid for income taxes		(26)	(2,773)
Cash paid for interest		$ 95	$ 0

[1] Note 1

[2] unaudited