Commitments and Contingencies - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2016 USD ($) a	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Loss Contingencies [Line Items]
Lease agreement period	5 years
Capitalized leasehold costs	$ 0.7
Lease agreement, term	The Company leases office space under an operating lease that expires in 2024.
Rent expense	$ 0.9	$ 1.1	$ 0.3
Other Lawsuit [Member]
Loss Contingencies [Line Items]
Area of leasehold property held | a	60