Commitments and Contingencies - Additional Information (Detail)		6 Months Ended
	Jan. 04, 2018 USD ($) ft²	Mar. 31, 2018
California [Member]
Loss Contingencies [Line Items]
Lease expiration date		Jun. 30, 2021
Term of lessee's operating lease renewal		5 years
North Carolina [Member]
Loss Contingencies [Line Items]
Lease expiration date		Nov. 30, 2014
Term of lessee's operating lease renewal		3 months
Massachusetts [Member]
Loss Contingencies [Line Items]
Lease expiration date		Nov. 30, 2015
Term of lessee's operating lease renewal		1 year
Texas [Member] | Sublease [Member]
Loss Contingencies [Line Items]
Lease expiration date	Dec. 31, 2018
Term of lessee's operating lease renewal	1 year
Operating sub-lease area | ft²	600
Monthly rent expense for the initial term of the lease | $	$ 1,500