Subsequent Events - Additional Information (Detail)			12 Months Ended
	Mar. 17, 2017 Director	Mar. 15, 2017 USD ($)	Dec. 31, 2016
Term Loan, Second Tranche [Member] | Maximum [Member]
Subsequent Event [Line Items]
Term loan available date			Sep. 30, 2017
Term Loan, Third Tranche [Member] | Maximum [Member]
Subsequent Event [Line Items]
Term loan available date			Jun. 30, 2018
Subsequent Event [Member] | Settlement Agreement with WLA [Member]
Subsequent Event [Line Items]
Dismiss the actions within periods of business	10 days
Number of additional independent directors | Director	2
Period to comply with agreement	2 years
Subsequent Event [Member] | Term Loan, Second Tranche [Member]
Subsequent Event [Line Items]
Additional funds available under the term loan		$ 25,000,000
Subsequent Event [Member] | Term Loan, Second Tranche [Member] | Maximum [Member]
Subsequent Event [Line Items]
Term loan available date		Jun. 30, 2018
Subsequent Event [Member] | Term Loan, Third Tranche [Member]
Subsequent Event [Line Items]
Additional funds available under the term loan		$ 25,000,000
Subsequent Event [Member] | Term Loan, Third Tranche [Member] | Maximum [Member]
Subsequent Event [Line Items]
Term loan available date		Jun. 30, 2018