Commitments and Contingencies - Additional Information (Detail)		1 Months Ended	6 Months Ended
	Jun. 01, 2018 ft²	Feb. 28, 2018 ft²	Jun. 30, 2018 USD ($)
Commitment And Contingencies [Line Items]
Lease agreement, space | ft²	40,000	63,761
Lease agreement, commencement date		Jun. 01, 2018
Lease agreement, term		126 months
Lease agreement, term			5 years
Number of options to extend the term			2
Lease agreement payment condition			Fixed rent with respect to 40,000 square feet of the Premises commenced on the Commencement Date, and rent for the full 63,761 square feet of the Premises shall begin 19 months following the Commencement Date.
Letter of Credit
Commitment And Contingencies [Line Items]
Lease agreement, security deposit | $			$ 163,000