Consolidated Statements of Stockholders' Equity (Deficit) - USD ($) $ in Thousands	Total	Treasury Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Class A Common	Class A Common Common Stock	Class B Common Common Stock
Balance (in shares) at Dec. 31, 2016		(7,508,985)					72,271,298	83,303,628
Balance at Dec. 31, 2016	$ 683,577	$ (106,231)	$ 516,300	$ 274,087	$ (580)		$ 0	$ 1
Consolidated Statements of Stockholders' Equity (Deficit)
Repurchase of common stock (in shares)		(7,111,190)				(7,111,190)
Repurchase of common stock	(93,586)	$ (93,586)				$ (93,600)
Stock-based compensation expense	17,164		17,164
Exercise of stock options (in shares)							654,035	6,833
Exercise of stock options	4,967		4,967
Conversion Class B to Class A common stock (in shares)							2,352,966	(2,352,966)
Issuance of shares related to restricted stock units and awards (in shares)							2,546,426
Shares withheld for employee taxes upon conversion of restricted stock (in shares)							(236,707)
Shares withheld for employee taxes upon conversion of restricted stock	(4,272)		(4,272)
Other comprehensive loss	104				104
Net income (loss)	34,818			34,818
Balance (in shares) at Dec. 31, 2017		(14,620,175)					77,588,018	80,957,495
Balance at Dec. 31, 2017	642,772	$ (199,817)	534,159	308,905	(476)		$ 0	$ 1
Consolidated Statements of Stockholders' Equity (Deficit)
Repurchase of common stock (in shares)						0
Stock-based compensation expense	16,044		16,044
Issuance of common stock related to business combination (in shares)							7,598,731
Issuance of common stock related to business combination	70,000		70,000
Exercise of stock options (in shares)							258,921
Exercise of stock options	1,834		1,834
Conversion Class B to Class A common stock (in shares)							348,810	(348,810)
Issuance of shares related to restricted stock units and awards (in shares)							1,168,541
Shares withheld for employee taxes upon conversion of restricted stock (in shares)							(283,446)
Shares withheld for employee taxes upon conversion of restricted stock	(3,363)		(3,363)
Other comprehensive loss	(6,264)				(6,264)
Net income (loss)	(39,164)			(39,164)
Balance (in shares) at Dec. 31, 2018		(14,620,175)					86,679,575	80,608,685
Balance at Dec. 31, 2018	682,589	$ (199,817)	618,674	270,471	(6,740)		$ 0	$ 1
Consolidated Statements of Stockholders' Equity (Deficit)
Repurchase of common stock (in shares)						0
Stock-based compensation expense	19,996		19,996
Exercise of stock options (in shares)							403,643	139,270
Exercise of stock options	3,669		3,669
Conversion Class B to Class A common stock (in shares)							1,378,544	(1,378,544)
Conversion Class B to Class A common stock							$ 1	$ (1)
Issuance of shares related to restricted stock units and awards (in shares)							2,286,379
Shares withheld for employee taxes upon conversion of restricted stock (in shares)							(420,413)
Shares withheld for employee taxes upon conversion of restricted stock	(5,878)		(5,878)
Other comprehensive loss	(19,992)				(19,992)
Net income (loss)	7,775			7,775
Balance (in shares) at Dec. 31, 2019		(14,620,175)					90,327,728	79,369,411
Balance at Dec. 31, 2019	$ 688,159	$ (199,817)	$ 636,461	$ 278,246	$ (26,732)		$ 1	$ 0