Intangible Assets - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Finite Lived Intangible Assets Accumulated Amortization Addition	$ 82,000	$ 95,000	$ 171,000	$ 190,000