Property and Equipment - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Property and Equipment [Line Items]
Computer software development costs capitalized	$ 8,900,000	$ 6,600,000
Retainage amount included in construction in progress	200,000		$ 100,000
Interest cost Paid	400,000	400,000
Interest Costs Capitalized	100,000	400,000
Depreciation and amortization	4,805,000	3,032,000
Property and Equipment [Member]
Property and Equipment [Line Items]
Depreciation and amortization	$ 9,300,000	$ 6,000,000.0