Net Revenues and Long-Lived Assets of Company (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Segment Reporting Information [Line Items]
Net revenues	$ 15,022	$ 21,251
Long-lived assets	115	119
UNITED STATES
Segment Reporting Information [Line Items]
Net revenues	15,022	21,251
Long-lived assets	25	26
Foreign
Segment Reporting Information [Line Items]
Long-lived assets	$ 90	$ 93