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Nature of Business (Details) $ in Thousands		12 Months Ended
	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Disaggregation of Revenue [Line Items]
Revenue		$ 310,056	$ 256,012	$ 190,071
Discontinued operations, disposed of by sale | MyCase
Disaggregation of Revenue [Line Items]
Ownership percentage in disposed subsidiary	1
Consideration for disposal of subsidiary	$ 193,000
Gain on sale of subsidiary	$ 187,700
Software and services offered to real estate vertical
Disaggregation of Revenue [Line Items]
Revenue		$ 284,700	$ 231,100	$ 172,400

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