Summary of Significant Accounting Policies - Additional Information (Details)	3 Months Ended	9 Months Ended	12 Months Ended
	Jun. 30, 2019 USD ($)	Sep. 30, 2018	Dec. 31, 2019 USD ($) subsidiary	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Accounting Policies [Line Items]
Goodwill impairment	$ 0
Number of wholly-owned subsidiaries | subsidiary			16
Accounts receivable, net			$ 396,500,000	$ 314,900,000
Sales commission, renewal period			1 year
Research and development expense			$ 81,342,000	63,264,000	$ 47,324,000
Impairments of intangible assets			0	0	0
Impairments of long-lived assets			0	0	0
Capitalized post acquisition software development costs			$ 4,800,000
Remaining estimated economic life			5 years
Amortization of software development costs			$ 296,000
Purchase of held to maturity securities			81,600,000
Cost-method investment impairment			0	0	0
Cash and cash equivalents			232,682,000	134,279,000	$ 185,926,000	$ 36,151,000
Convertible Preferred Stock | Record Holdings Pty Limited
Accounting Policies [Line Items]
Cost method investment			$ 15,000,000.0
Investment percentage			20.00%
Minimum
Accounting Policies [Line Items]
Typical contract term			3 years
Contract term			1 year
Progress billing retention percentage			5.00%
Payment term			30 days
Sales commissions amortization period			3 years
Vesting period			3 years
Maximum
Accounting Policies [Line Items]
Typical contract term			5 years
Contract term			10 years
Progress billing retention percentage			20.00%
Payment term			90 days
Sales commissions amortization period			7 years
Vesting period			6 years
Stock Option Plan
Accounting Policies [Line Items]
Contractual term			10 years
Stock Option Plan | Minimum
Accounting Policies [Line Items]
Vesting period			3 years
Stock Option Plan | Maximum
Accounting Policies [Line Items]
Vesting period			6 years
Restricted Stock Units (RSUs) | Minimum
Accounting Policies [Line Items]
Vesting period			3 years
Restricted Stock Units (RSUs) | Maximum
Accounting Policies [Line Items]
Vesting period			5 years
Unbilled Revenues
Accounting Policies [Line Items]
Accounts receivable, net			$ 134,000,000.0	104,200,000
Unbilled Revenues | Retention Receivable
Accounting Policies [Line Items]
Accounts receivable, net			$ 13,100,000	$ 12,200,000
SaaS arrangements services | Minimum
Accounting Policies [Line Items]
Typical contract term			3 years
Contract term			1 year
SaaS arrangements services | Maximum
Accounting Policies [Line Items]
Typical contract term			5 years
Contract term		10 years
Appraisal services | Minimum
Accounting Policies [Line Items]
Contract term			1 year
Appraisal services | Maximum
Accounting Policies [Line Items]
Contract term			3 years