Commitments and Contingencies - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Commitments And Contingencies Disclosure [Abstract]
Lease cancellation notice period	30 days
Commitment maturing in the next fiscal year	$ 33,200,000
Other commitment, due in second year	8,100,000
Other commitment, due in third year	$ 685,000
Lease term expiration date	Mar. 31, 2020
Tenant improvement allowance	$ 6,300,000
Early termination right effective date	Mar. 31, 2018
Early termination fees	$ 1,000,000
Rent expense	$ 1,700,000	$ 1,200,000	$ 803,000