Fair Value of Financial Instruments - Summary of Financial Assets Measured at Fair Value on Recurring Basis (Detail) - Fair Value, Measurements, Recurring $ in Thousands	Mar. 31, 2017 USD ($)
Level 1
Assets:
Fair value measurement disclosure	$ 0
Level 2
Assets:
Fair value measurement disclosure	100,057
Level 3
Assets:
Fair value measurement disclosure	0
Certificates of Deposit | Level 1
Assets:
Fair value measurement disclosure	0
Certificates of Deposit | Level 2
Assets:
Fair value measurement disclosure	100,057
Certificates of Deposit | Level 3
Assets:
Fair value measurement disclosure	0
Fair Value
Assets:
Fair value measurement disclosure	100,057
Fair Value | Certificates of Deposit
Assets:
Fair value measurement disclosure	$ 100,057