Condensed Consolidated Statements of Changes in Equity - USD ($) $ in Thousands		Total		Preferred stock	Common Stock	Additional Paid-in Capital	Treasury Stock	Accumulated Other Comprehensive Income	Accumulated Deficit
Beginning balance (in shares) at Dec. 31, 2019				0	88,757,406		461,391
Beginning balance at Dec. 31, 2019		$ 900,187		$ 0	$ 892	$ 1,467,882	$ (19,550)	$ (565)	$ (548,472)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation		35,211				35,211
Net issuances under equity incentive plans, net of tax (in shares)	[1]				1,744,210		5,658
Net issuances under equity incentive plans, net of tax	[1]	(5,477)			$ 17	(5,423)	$ (71)
Net issuances of stock related to acquisition		0
Preferred stock converted into common stock (in shares)	[2]			195,627	(19,562,781)
Preferred stock converted into common stock	[2]	(50,204)		$ 2	$ (196)	194			(50,204)
Retirement of treasury stock					$ (4)	(19,617)	$ 19,621
Retirement of treasury stock (in shares)							(467,049)
Net unrealized gain on securities available for sale, net of tax		(7,017)						(7,017)
Consolidated net income (loss)		(126,558)	[3]						(126,558)
Ending balance (in shares) at Jun. 30, 2020				195,627	70,938,835		0
Ending balance at Jun. 30, 2020		746,142		$ 2	$ 709	1,478,247	$ 0	(7,582)	(725,234)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Payment of deemed dividend due to beneficial conversion feature		50,200
Beginning balance (in shares) at Mar. 31, 2020				195,628	69,869,214		0
Beginning balance at Mar. 31, 2020		796,546		$ 2	$ 699	1,463,535	$ 0	(20,927)	(646,763)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation		15,512				15,512
Net issuances under equity incentive plans, net of tax (in shares)	[1]				1,069,521
Net issuances under equity incentive plans, net of tax	[1]	(790)			$ 10	(800)
Preferred stock converted into common stock (in shares)				(1)	100
Net unrealized gain on securities available for sale, net of tax		13,345						13,345
Consolidated net income (loss)		(78,471)							(78,471)
Ending balance (in shares) at Jun. 30, 2020				195,627	70,938,835		0
Ending balance at Jun. 30, 2020		746,142		$ 2	$ 709	1,478,247	$ 0	(7,582)	(725,234)
Beginning balance (in shares) at Dec. 31, 2020				43,000	88,149,510		0
Beginning balance at Dec. 31, 2020		724,171		$ 0	$ 881	1,508,020	$ 0	1,484	(786,214)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation		34,666				34,666
Net issuances under equity incentive plans, net of tax (in shares)	[1]				2,390,524		4,251
Net issuances under equity incentive plans, net of tax	[1]	(3,617)			$ 24	(3,549)	$ (92)
Net issuances of stock related to acquisition (in shares)	[4]				3,761,114
Net issuances of stock related to acquisition	[4]	41,462			$ 38	41,424
Preferred stock converted into common stock (in shares)				(43,000)	4,300,000
Preferred stock converted into common stock					$ 43	(43)
Net unrealized gain on securities available for sale, net of tax		3,390						3,390
Consolidated net income (loss)		(37,713)	[3]						(37,713)
Ending balance (in shares) at Jun. 30, 2021				0	98,601,148		4,251
Ending balance at Jun. 30, 2021		762,359		$ 0	$ 986	1,580,518	$ (92)	4,874	(823,927)
Beginning balance (in shares) at Mar. 31, 2021				0	97,228,126		4,251
Beginning balance at Mar. 31, 2021		733,135		$ 0	$ 972	1,563,865	$ (92)	1,688	(833,298)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation		18,901				18,901
Net issuances under equity incentive plans, net of tax (in shares)					1,373,022
Net issuances under equity incentive plans, net of tax		(2,234)			$ 14	(2,248)
Net unrealized gain on securities available for sale, net of tax		3,186						3,186
Consolidated net income (loss)		9,371							9,371
Ending balance (in shares) at Jun. 30, 2021				0	98,601,148		4,251
Ending balance at Jun. 30, 2021		$ 762,359		$ 0	$ 986	$ 1,580,518	$ (92)	$ 4,874	$ (823,927)

[1] Includes shares that were transferred to the Company to satisfy payment of all or a portion of the exercise price in connection with the exercise of stock options.

[2] Includes a payment of $50.2 million that was recorded as a deemed dividend within accumulated deficit related to the beneficial conversion feature of the Series A Preferred Stock issued on March 20, 2020, which would convert into common stock upon a sale by the preferred stockholder to a third party.

[3] Prior period amounts have been reclassified to conform to the current period presentation. See “Notes to Condensed Consolidated Financial Statements – Note 1. Summary of Significant Accounting Policies” for additional information.

[4] Stock issued as part of the consideration paid related to the acquisition of Radius. See “Note 2. Business Acquisition.”