Commitments and Contingencies - Additional Information (Detail)		12 Months Ended
	Nov. 01, 2017 USD ($) ft²	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Loss Contingencies [Line Items]
Operating leases, area of office and laboratory facilities | ft²	14,141
Operating lease, initial term	90 months
Number of months of free rent under initial lease term	6 months
Percentage of annual escalation of base rent during lease term	3.00%
Upfront payment	$ 282,820
Operating lease interest rate per annum	8.50%
Tenant improvement allowance to be reimbursed	$ 902,051
Payments of rent	902,051
Amortization of lease incentive		$ 115,782	$ 29,854
Operating lease rent expense		632,658	562,840
Deferred rent from rent escalation		$ 182,062	$ 82,180
Other Assets [Member]
Loss Contingencies [Line Items]
Operating leases, security Deposit	$ 34,174