CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended					6 Months Ended		12 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Cash flows from operating activities
Net (loss) income	$ (50,328)	$ (32,011)		$ (4,514)	$ 6,617	$ (82,339)	$ 2,103
Less: (Loss) income from discontinued operations	(37,399)			3,502		(50,151)	18,569
Net loss from continuing operations	(12,929)			(8,016)		(32,188)	(16,466)
Adjustments to reconcile net loss to net cash used in operating activities:
Amortization of convertible notes conversion option and debt issuance costs						485	3,876
Accreted interest on convertible note principal						38	0
Amortization of intangible assets	335			344		637	662
Amortization of right-of-use assets						370	362
Change in fair value of derivative assets						73	(3)
Loss on extinguishment of convertible notes	0		$ 3,900	0		606	0
Other amortization and depreciation						867	1,509
Loss on disposal of property and equipment						316	0
Stock-based compensation expense						18,000	3,210
Deferred income taxes						(158)	9,353
Changes in assets and liabilities:
Accounts receivable						582	(3,532)
Prepaid and other current assets						(21,944)	5,614
Inventory						(5,991)	(1,138)
Other assets						67	406
Accounts payable						843	1,078
Accrued liabilities						3,360	1,155
Other long-term liabilities						266	167
Net cash (used in) provided by operating activities - continuing operations						(33,771)	6,253
Net cash used in operating activities - discontinued operations						1,688	(14,428)
Cash flows from investing activities
Purchase of intangible assets						0	(1,700)
Purchase of property and equipment						(235)	(163)
Net cash used in investing activities - continuing operations						(235)	(1,863)
Net cash provided by (used in) investing activities - discontinued operations						24,966	(27,274)
Cash flows from financing activities
Proceeds from the exercise of stock options						461	0
Repurchase of convertible notes						(18,845)	0	$ (97,900)
Net receipts for capped call transactions						801	0
Payment of contingent consideration						0	(1,071)
Repurchase of Company common stock						(39,374)	(71,266)
Net settlement of stock-based compensation awards						(3,462)	0
Net cash used in financing activities - continuing operations						(60,419)	(72,337)
Net cash used in financing activities - discontinued operations						(359)	0
Net decrease in cash and cash equivalents						(68,130)	(109,649)
Cash and cash equivalents at beginning of the period		$ 193,451			$ 394,590	193,451	394,590	394,590
Cash and cash equivalents at end of the period	125,321		$ 193,451	284,941		125,321	284,941	$ 193,451
Less: Cash and cash equivalents of discontinued operations				28,447			28,447
Cash and cash equivalents of continuing operations at end of period	105,446			$ 256,494		105,446	256,494
Supplemental cash flow information
Cash (refunded) paid for income taxes						(4)	3,980
Cash paid for interest						298	4,591
Supplemental schedule of non-cash investing and financing activities
Noncash liquidating distribution	$ 64,400					64,400	0
Assets held for sale reclassified from other assets to intangible assets						$ 0	$ 1,811