Fair Value of Financial Assets and Liabilities - Summary of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - Fair Value on Recurring Basis [Member] - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Assets Fair Value Disclosure
Assets Fair Value Disclosure	$ 187,289	$ 126,539
Level 1 [Member]
Assets Fair Value Disclosure
Assets Fair Value Disclosure	187,289	126,539
Money Market Funds [Member]
Assets Fair Value Disclosure
Assets Fair Value Disclosure	186,797	126,047
Money Market Funds [Member] | Level 1 [Member]
Assets Fair Value Disclosure
Assets Fair Value Disclosure	186,797	126,047
Restricted Cash [Member]
Assets Fair Value Disclosure
Assets Fair Value Disclosure	492	492
Restricted Cash [Member] | Level 1 [Member]
Assets Fair Value Disclosure
Assets Fair Value Disclosure	$ 492	$ 492