Stockholders' Equity (Deficit) - Summary Of Common Stock Outstanding Immediately After The Business Combination (Detail) - shares	Sep. 30, 2020	Jun. 11, 2020	Jun. 10, 2020	Dec. 31, 2019
Class of Stock [Line Items]
Common stock, shares outstanding (in shares)	126,919,572	91,849,909	91,849,909	37,631,052
Percentage of common stock held by stockholders	100.00%		100.00%
Open Lending, LLC unitholders
Class of Stock [Line Items]
Common stock, shares outstanding (in shares)	74,409,655		51,909,655
Percentage of common stock held by stockholders	59.00%		56.00%
Public stockholders
Class of Stock [Line Items]
Common stock, shares outstanding (in shares)	24,384,917		16,502,754
Percentage of common stock held by stockholders	19.00%		18.00%
Nebula Holdings, LLC and its affiliates
Class of Stock [Line Items]
Common stock, shares outstanding (in shares)	16,625,000		11,937,500
Percentage of common stock held by stockholders	13.00%		13.00%
PIPE Investors
Class of Stock [Line Items]
Common stock, shares outstanding (in shares)	11,500,000		11,500,000
Percentage of common stock held by stockholders	9.00%		13.00%