Net Revenues and Long-Lived Assets of Company (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Segment Reporting Information [Line Items]
Net revenues	$ 21,251	$ 45,751
Long-lived assets	119	130
UNITED STATES
Segment Reporting Information [Line Items]
Net revenues	21,251	45,751
Long-lived assets	26	32
Foreign
Segment Reporting Information [Line Items]
Long-lived assets	$ 93	$ 98