Net Income (Loss) Per Share - Basic and Diluted Net Income (Loss) per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended	3 Months Ended		4 Months Ended	6 Months Ended
		Feb. 29, 2020	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2020	Jun. 30, 2019
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Allocation of undistributed LendingClub net loss			$ (78,471)	$ (10,661)		$ (126,558)	$ (30,596)
Common Stock
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Allocation of undistributed LendingClub net loss						(104,686)	(30,596)
Deemed dividend						(50,204)	0
Net loss attributable to stockholders			$ (61,389)	$ (10,661)		$ (154,890)	$ (30,596)
Weighted-average common shares - Basic and Diluted (shares)	[1]		70,304,166	86,719,049		78,406,162	86,429,892
Net loss per share attributable to common stockholders:
Net loss per share – Basic and Diluted ($ per share)	[1]		$ (0.87)	$ (0.12)		$ (1.98)	$ (0.35)
Preferred Stock
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Allocation of undistributed LendingClub net loss						$ (21,872)
Deemed dividend		$ 50,200			$ 0	50,204
Net loss attributable to stockholders			$ (17,082)			$ 28,332
Weighted-average common shares - Basic and Diluted (shares)	[1]		19,562,714	0		11,071,212	0
Net loss per share attributable to common stockholders:
Net loss per share – Basic and Diluted ($ per share)	[1]		$ (0.87)	$ 0.00		$ 2.56	$ 0.00

[1] See “Notes to Condensed Consolidated Financial Statements – Note 4. Net Income (Loss) Per Share” and “Note 14. Stockholders' Equity” for additional information.