Condensed Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings (Accumulated Deficit)	Accumulated Other Comprehensive Gain (Loss)	Cumulative effect of adoption of ASC 326	Cumulative effect of adoption of ASC 326 Retained Earnings (Accumulated Deficit)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of adoption of ASC 326	$ 301,818	$ 6	$ 315,291	$ (12,908)	$ (571)
Beginning balance (in shares) at Dec. 31, 2018		61,579
Beginning Balance at Dec. 31, 2018	301,818	$ 6	315,291	(12,908)	(571)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of adoption of ASC 326	325,838	$ 6	333,706	(6,994)	(880)
Receipt of Section 16(b) disgorgement, net of tax effect	3,743		3,743
Shares issued pursuant to stock awards, net of tax withholdings related to vesting of restricted stock units (in shares)		863
Shares issued pursuant to stock awards, net of tax withholdings related to vesting of restricted stock units	8,587		8,587
Stock-based compensation	5,335		5,335
Equity settled contingent consideration (in shares)		21
Equity-settled contingent consideration	750		750
Cumulative translation adjustment	(1,011)				(1,011)
Unrealized gain on investments, net of tax	702				702
Net income (loss)	5,914			5,914
Ending balance (in shares) at Mar. 31, 2019		62,463
Ending Balance at Mar. 31, 2019	325,838	$ 6	333,706	(6,994)	(880)
Beginning balance (in shares) at Dec. 31, 2018		61,579
Beginning Balance at Dec. 31, 2018	301,818	$ 6	315,291	(12,908)	(571)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of adoption of ASC 326	331,428	$ 6	341,110	(10,213)	525
Cumulative translation adjustment	182
Unrealized gain on investments, net of tax	914
Net income (loss)	2,695
Ending balance (in shares) at Jun. 30, 2019		62,772
Ending Balance at Jun. 30, 2019	331,428	$ 6	341,110	(10,213)	525
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of adoption of ASC 326	325,838	$ 6	333,706	(6,994)	(880)
Beginning balance (in shares) at Mar. 31, 2019		62,463
Beginning Balance at Mar. 31, 2019	325,838	$ 6	333,706	(6,994)	(880)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of adoption of ASC 326	331,428	$ 6	341,110	(10,213)	525
Shares issued pursuant to stock awards, net of tax withholdings related to vesting of restricted stock units (in shares)		309
Shares issued pursuant to stock awards, net of tax withholdings related to vesting of restricted stock units	(620)		(620)
Stock-based compensation	8,024		8,024
Cumulative translation adjustment	1,193				1,193
Unrealized gain on investments, net of tax	212				212
Net income (loss)	(3,219)			(3,219)
Ending balance (in shares) at Jun. 30, 2019		62,772
Ending Balance at Jun. 30, 2019	331,428	$ 6	341,110	(10,213)	525
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of adoption of ASC 326	331,428	6	341,110	(10,213)	525
Cumulative effect of adoption of ASC 326	424,907	$ 7	412,191	14,235	(1,526)	$ (609)	$ (609)
Beginning balance (in shares) at Dec. 31, 2019		65,260
Beginning Balance at Dec. 31, 2019	424,907	$ 7	412,191	14,235	(1,526)	(609)	(609)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of adoption of ASC 326	426,385	$ 7	427,510	(1,847)	715	(609)	(609)
Shares issued pursuant to stock awards, net of tax withholdings related to vesting of restricted stock units (in shares)		625
Shares issued pursuant to stock awards, net of tax withholdings related to vesting of restricted stock units	1,655		1,655
Stock-based compensation	13,664		13,664
Cumulative translation adjustment	998				998
Unrealized gain on investments, net of tax	1,243				1,243
Net income (loss)	(15,473)			(15,473)
Ending balance (in shares) at Mar. 31, 2020		65,885
Ending Balance at Mar. 31, 2020	426,385	$ 7	427,510	(1,847)	715
Beginning balance (in shares) at Dec. 31, 2019		65,260
Beginning Balance at Dec. 31, 2019	424,907	$ 7	412,191	14,235	(1,526)	(609)	(609)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of adoption of ASC 326	409,478	$ 7	443,466	(37,140)	3,145	$ (609)	$ (609)
Cumulative translation adjustment	1,611
Unrealized gain on investments, net of tax	3,060
Net income (loss)	(50,766)
Ending balance (in shares) at Jun. 30, 2020		66,144
Ending Balance at Jun. 30, 2020	409,478	$ 7	443,466	(37,140)	3,145
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of adoption of ASC 326	426,385	$ 7	427,510	(1,847)	715
Beginning balance (in shares) at Mar. 31, 2020		65,885
Beginning Balance at Mar. 31, 2020	426,385	$ 7	427,510	(1,847)	715
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of adoption of ASC 326	409,478	$ 7	443,466	(37,140)	3,145
Shares issued pursuant to stock awards, net of tax withholdings related to vesting of restricted stock units (in shares)		259
Shares issued pursuant to stock awards, net of tax withholdings related to vesting of restricted stock units	(967)		(967)
Stock-based compensation	16,923		16,923
Cumulative translation adjustment	613				613
Unrealized gain on investments, net of tax	1,817				1,817
Net income (loss)	(35,293)			(35,293)
Ending balance (in shares) at Jun. 30, 2020		66,144
Ending Balance at Jun. 30, 2020	409,478	$ 7	443,466	(37,140)	3,145
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of adoption of ASC 326	$ 409,478	$ 7	$ 443,466	$ (37,140)	$ 3,145