Subsequent Events - Additional Information (Detail) - USD ($)		3 Months Ended	12 Months Ended
	Apr. 20, 2016	Mar. 31, 2016	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Subsequent Event [Line Items]
Options, grant date price		$ 6.77
Scenario, Forecast | 2016 [Member]
Subsequent Event [Line Items]
Expected stock option compensation expense increase						$ 1,700,000
Scenario, Forecast | 2017 [Member]
Subsequent Event [Line Items]
Expected stock option compensation expense increase					$ 1,400,000
Scenario, Forecast | 2018 [Member]
Subsequent Event [Line Items]
Expected stock option compensation expense increase				$ 584,000
Scenario, Forecast | 2019 [Member]
Subsequent Event [Line Items]
Expected stock option compensation expense increase			$ 118,000
Subsequent Event [Member] | Certain Executives and Key Employees [Member]
Subsequent Event [Line Items]
Options, number granted	1,525,027
Options, grant date price	$ 7.15
Options, weighted average fair market value	$ 2.50
Options granted, fair market value	$ 3,800,000