INCOME TAXES, Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Mar. 31, 2017
Breakdown Between Current and Non-current Deferred Tax Assets (Liabilities) [Abstract]
Deferred tax assets, current	$ 0	$ 5,644
Deferred tax assets, non-current	7,913	4,392
Deferred tax liabilities, non-current	(203)	(234)
Total net deferred tax assets	7,710	9,802
Deferred tax assets [Abstract]
Research and development tax credit carryforwards	1,218	917
Capitalized research and development	10	45
Inventory reserves	348	598
Deferred revenue from extended maintenance agreements	550	1,074
Warranty reserves	1,282	1,659
Accrued payroll and other accrued expenses	1,192	1,715
Share-based compensation	4,014	4,753
Alternative minimum tax credits	24	24
Tax on deferred intercompany profit	1,085	1,221
Other	595	696
Total deferred tax assets	10,318	12,702
Deferred tax liabilities [Abstract]
Depreciation	(2,317)	(2,518)
Other	(291)	(382)
Total deferred tax liabilities	(2,608)	(2,900)
Net deferred tax assets	$ 7,710	$ 9,802