Condensed Consolidated Statements of Changes in Stockholders' Equity (Deficit) - USD ($) $ in Thousands	Total	Earn-Out Shares Contingent Consideration	Lock-Up Shares Contingent Consideration	Cumulative Effect, Period of Adoption, Adjustment	Cumulative Effect, Period of Adoption, Adjusted Balance	Common Stock	Common Stock Earn-Out Shares Contingent Consideration	Common Stock Lock-Up Shares Contingent Consideration	Common Stock Cumulative Effect, Period of Adoption, Adjustment	Common Stock Cumulative Effect, Period of Adoption, Adjusted Balance	Additional Paid-in Capital	Additional Paid-in Capital Earn-Out Shares Contingent Consideration	Additional Paid-in Capital Lock-Up Shares Contingent Consideration	Additional Paid-in Capital Cumulative Effect, Period of Adoption, Adjustment	Additional Paid-in Capital Cumulative Effect, Period of Adoption, Adjusted Balance	Accumulated Deficit	Accumulated Deficit Cumulative Effect, Period of Adoption, Adjusted Balance	Treasury Stock	Redeemable Convertible Series C Preferred Units	Redeemable Convertible Series C Preferred Units Cumulative Effect, Period of Adoption, Adjustment	Redeemable Convertible Series C Preferred Units Cumulative Effect, Period of Adoption, Adjusted Balance	Common Units	Common Units Cumulative Effect, Period of Adoption, Adjustment	Common Units Cumulative Effect, Period of Adoption, Adjusted Balance	Series A and B Preferred Units Preferred Stock	Series A and B Preferred Units Preferred Stock Cumulative Effect, Period of Adoption, Adjustment	Series A and B Preferred Units Preferred Stock Cumulative Effect, Period of Adoption, Adjusted Balance
Beginning balance (in units) at Dec. 31, 2019																			21,906,852	(7,628,249)	14,278,603	25,381,873	(25,381,873)	0
Beginning balance at Dec. 31, 2019																			$ 304,943		$ 304,943	$ 7,524	$ (7,524)	$ 0
Redeemable Convertible Series C Preferred Units
Fair value adjustment of redemption option																			$ (47,537)
Ending balance (in units) at Mar. 31, 2020																			14,278,603			0
Ending balance at Mar. 31, 2020																			$ 257,406			$ 0
Beginning balance (in shares) at Dec. 31, 2019						0			37,631,052	37,631,052															29,058,266	(29,058,266)	0
Beginning balance at Dec. 31, 2019	$ (234,779)			$ 0	$ (234,779)	$ 0			$ 376	$ 376	$ 0			$ 7,626	$ 7,626	$ (242,781)	$ (242,781)								$ 478	$ (478)	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Fair value adjustment of redemption option	47,537															47,537
Share-based compensation	487										487
Distribution to Open Lending, LLC unitholders	(135,380)															(135,380)
Net income (loss)	8,172															8,172
Ending balance (in shares) at Mar. 31, 2020						37,631,052																			0
Ending balance at Mar. 31, 2020	(313,963)					$ 376					8,113					(322,452)									$ 0
Beginning balance (in units) at Dec. 31, 2019																			21,906,852	(7,628,249)	14,278,603	25,381,873	(25,381,873)	0
Beginning balance at Dec. 31, 2019																			$ 304,943		$ 304,943	$ 7,524	$ (7,524)	$ 0
Redeemable Convertible Series C Preferred Units
Fair value adjustment of redemption option	(47,537)
Ending balance (in units) at Sep. 30, 2020																			0			0
Ending balance at Sep. 30, 2020																			$ 0			$ 0
Beginning balance (in shares) at Dec. 31, 2019						0			37,631,052	37,631,052															29,058,266	(29,058,266)	0
Beginning balance at Dec. 31, 2019	(234,779)			$ 0	$ (234,779)	$ 0			$ 376	$ 376	0			$ 7,626	$ 7,626	(242,781)	$ (242,781)								$ 478	$ (478)	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(112,766)
Ending balance (in shares) at Sep. 30, 2020						126,919,572																			0
Ending balance at Sep. 30, 2020	34,282					$ 1,269					476,403					(443,390)									$ 0
Beginning balance (in units) at Mar. 31, 2020																			14,278,603			0
Beginning balance at Mar. 31, 2020																			$ 257,406			$ 0
Redeemable Convertible Series C Preferred Units
Recapitalization transaction, net of transaction costs (in units)																			(14,278,603)
Recapitalization transaction, net of transaction costs																			$ (257,406)
Ending balance (in units) at Jun. 30, 2020																			0			0
Ending balance at Jun. 30, 2020																			$ 0			$ 0
Beginning balance (in shares) at Mar. 31, 2020						37,631,052																			0
Beginning balance at Mar. 31, 2020	(313,963)					$ 376					8,113					(322,452)									$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Recapitalization transaction, net of transaction costs (in shares)						54,218,857
Recapitalization transaction, net of transaction costs	242,543					$ 542					242,001
Deferred tax asset	1,874										1,874
Estimated fair value of contingent consideration at June 10, 2020	(347,089)										(347,089)
Share-based compensation	2,189										2,189
Net income (loss)	(49,805)															(49,805)
Ending balance (in shares) at Jun. 30, 2020						91,849,909																			0
Ending balance at Jun. 30, 2020	(464,251)					$ 918					(92,912)					(372,257)									$ 0
Ending balance (in units) at Sep. 30, 2020																			0			0
Ending balance at Sep. 30, 2020																			$ 0			$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock Issued During Period, Value, New Issues	90,645					$ 79					90,566
Stock warrant exercise (in shares)						7,882,163
Stock issued during period, acquisitions		$ 419,844	$ 59,177				$ 238	$ 34				$ 419,606	$ 59,143
Stock issued during period, acquisitions (in shares)							23,750,000	3,437,500
Net income (loss)	(71,133)															(71,133)
Ending balance (in shares) at Sep. 30, 2020						126,919,572																			0
Ending balance at Sep. 30, 2020	34,282					$ 1,269					476,403					(443,390)									$ 0
Beginning balance (in shares) at Dec. 31, 2020						128,198,185												1,395,089
Beginning balance at Dec. 31, 2020	26,622					$ 1,282					491,246					(428,406)		$ (37,500)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation	701										701
Net income (loss)	12,862															12,862
Ending balance (in shares) at Mar. 31, 2021						128,198,185												1,395,089
Ending balance at Mar. 31, 2021	40,185					$ 1,282					491,947					(415,544)		$ (37,500)
Redeemable Convertible Series C Preferred Units
Fair value adjustment of redemption option	0
Beginning balance (in shares) at Dec. 31, 2020						128,198,185												1,395,089
Beginning balance at Dec. 31, 2020	26,622					$ 1,282					491,246					(428,406)		$ (37,500)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	118,242
Ending balance (in shares) at Sep. 30, 2021						128,198,185												2,007,834
Ending balance at Sep. 30, 2021	127,590					$ 1,282					493,972					(310,164)		$ (57,500)
Beginning balance (in shares) at Mar. 31, 2021						128,198,185												1,395,089
Beginning balance at Mar. 31, 2021	40,185					$ 1,282					491,947					(415,544)		$ (37,500)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation	927										927
Share repurchase (in shares)																		(612,745)
Share repurchase	(20,000)																	$ (20,000)
Net income (loss)	75,966															75,966
Ending balance (in shares) at Jun. 30, 2021						128,198,185												2,007,834
Ending balance at Jun. 30, 2021	97,078					$ 1,282					492,874					(339,578)		$ (57,500)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation	1,098										1,098
Net income (loss)	29,414															29,414
Ending balance (in shares) at Sep. 30, 2021						128,198,185												2,007,834
Ending balance at Sep. 30, 2021	$ 127,590					$ 1,282					$ 493,972					$ (310,164)		$ (57,500)