9. SEGMENT AND GEOGRAPHIC INFORMATION (Details) $ in Thousands	3 Months Ended
	Jun. 30, 2018 USD ($) segment	Jun. 30, 2017 USD ($)
Net revenues and long-lived assets by geographic area
Revenue, Net	$ 11,266	$ 10,687
Number of reporting units | segment	1
United States
Net revenues and long-lived assets by geographic area
Revenue, Net	$ 4,489	4,705
China
Net revenues and long-lived assets by geographic area
Revenue, Net	1,009	1,350
Singapore
Net revenues and long-lived assets by geographic area
Revenue, Net	2,003	2,202
Netherlands
Net revenues and long-lived assets by geographic area
Revenue, Net	2,399	1,202
Rest of the world
Net revenues and long-lived assets by geographic area
Revenue, Net	$ 1,366	$ 1,228