Net Revenues and Long-Lived Assets of Company (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Segment Reporting Information [Line Items]
Net revenues	$ 7,445	$ 6,293
Long-lived assets	310	545
UNITED STATES
Segment Reporting Information [Line Items]
Net revenues	7,445	6,293
Long-lived assets	178	252
Foreign
Segment Reporting Information [Line Items]
Long-lived assets	$ 132	$ 293