Commitments and Contingencies - Additional Information (Detail)		3 Months Ended	6 Months Ended
	Jul. 22, 2015 USD ($) ft²	Jun. 30, 2017 USD ($) Agreement	Jun. 30, 2017 USD ($) Agreement
Commitment And Contingencies [Line Items]
Number of additional license agreements | Agreement		2	2
License agreements fee		$ 2,300,000	$ 2,300,000
Maximum
Commitment And Contingencies [Line Items]
Milestone payments from the Company			$ 19,000,000
Jersey City, New Jersey
Commitment And Contingencies [Line Items]
Area of subleased space (in sqft) | ft²	10,141
Base rent, per month	$ 25,000
Annual increase in base rent (percent)	3.00%
Security deposit paid	$ 100,000
Rent expense		$ 100,000