Intangible Assets - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2019 Service	Dec. 31, 2018 USD ($) Service
Intangible Assets Net Excluding Goodwill [Abstract]
Number of professional services agreements identified with impairment indicators	6	4
Number of professional services agreements identified for impairment upon undiscounted cash flow models	2	2
Impairment of Intangible Assets | $		$ 0
Renewal term of professional services agreements	3 years 3 months 10 days
Weighted average amortization period	5 years 1 month 28 days