Organization, Business and Summary of Significant Accounting Policies (Tables)

9 Months Ended

12 Months Ended

Sep. 30, 2021

Dec. 31, 2020

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Rollforward of Allowance for Doubtful Accounts

A rollforward of the allowance for doubtful accounts is presented below (in thousands):

Balance at December 31, 2018	$	5,564
Charged to/reversed from expense		3,104
Charged to/from other accounts		—
Deductions (write offs)		(1,182	)
Balance at December 31, 2019	$	7,486
Charged to/reversed from expense		4,088
Charged to/from other accounts		283
Deductions (write offs)		(3,344	)
Balance at December 31, 2020	$	8,513

Estimated Useful Lives of Assets

Depreciation is calculated using the straight-line method over the following estimated useful lives of the assets:

Computer software and hardware	3 to 5 years
Leasehold improvements	Shorter of lease term or useful life
Furniture, fixtures and other equipment	3 to 5 years

Depreciation is calculated using the straight-line method over the following estimated useful lives of the assets:

Computer software and hardware	3 to 5 years
Leasehold improvements	Shorter of lease term or useful life
Furniture, fixtures and other equipment	3 to 5 years

Rollforward of Carrying Amount of Goodwill

The following table provides a rollforward of the carrying amount of goodwill (in thousands):

Balance at December 31, 2018	$	394,167
Acquisitions		263
Foreign currency translation		741
Balance at December 31, 2019		395,171
Acquisitions		1,009
Disposal		(96	)
Foreign currency translation		3,001
Balance at December 31, 2020	$	399,085

Summary of Revenue from Contracts with Customers

The following table summarizes revenue from contracts with customers for the three and nine months ended September 30, 2021 (in thousands):

	2021 Q3 (unaudited)						2020 Q3 (unaudited)
	Consolidated		Technology Solutions		Nebula		Consolidated		Technology Solutions		Nebula
Legal technology	$	70,323	$	63,261	$	7,062	$	62,036	$	57,769	$	4,267
Data recovery		10,799		10,799		—		10,265		10,265		—
Total revenue	$	81,122	$	74,060	$	7,062	$	72,301	$	68,034	$	4,267
	2021 September YTD (unaudited)						2020 September YTD (unaudited)
	Consolidated		Technology Solutions		Nebula		Consolidated		Technology Solutions		Nebula
Legal technology	$	204,760	$	185,454	$	19,306	$	183,903	$	170,240	$	13,663
Data recovery		33,462		33,462		—		31,050		31,050		—
Total revenue	$	238,222	$	218,916	$	19,306	$	214,953	$	201,290	$	13,663

The following table summarizes revenue from contracts with customers for the years ended December 31, 2020 and 2019 (in thousands):

	2020						2019
	Consolidated		Technology Solutions		Nebula		Consolidated		Technology Solutions		Nebula
Legal technology	$	247,285	$	228,511	$	18,774	$	265,850	$	249,996	$	15,854
Data recovery		42,260		42,260		—		46,204		46,204		—
Total revenue	$	289,545	$	270,771	$	18,774	$	312,054	$	296,200	$	15,854