Leases - Additional Information (Detail) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2019 USD ($)
Lessee Lease Description [Line Items]
Lessee, operating lease, existence of option to extend		true
Cash paid for operating leases	$ 0.3	$ 0.8
Right-of-use assets obtained in exchange for operating lease obligations	$ 0.0	$ 0.5
Minimum
Lessee Lease Description [Line Items]
Lessee, operating lease, renewal term	1 year	1 year
Maximum
Lessee Lease Description [Line Items]
Lessee, operating lease, renewal term	10 years	10 years