Commitments and Contingencies - Additional Information (Detail) $ in Thousands			3 Months Ended
	Jan. 31, 2017 USD ($)	Sep. 19, 2016 USD ($) Installment	Mar. 31, 2017 USD ($) $ / ft²	Mar. 31, 2016 USD ($)	Dec. 31, 2016 USD ($)
Leases [Abstract]
Expiration of non-cancellable operating leases			Through 2022
Accrued lease commitments expense			$ 3,800
Estimated sublease income			2,000
Rent expense under operating leases			$ 400	$ 300
Incentives per square feet | $ / ft²			40.00
Incentives for improvements to space			$ 2,200
Lease agreement term			10 years
Funds to be repaid under the agreement		$ 300	$ 300		$ 300
Interest rate of funds under the agreement		0.00%
Number of equal quarterly installments | Installment		20
Repayment of granted amount, paid on first installment	$ 17,133