DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) $ in Thousands	12 Months Ended
	Mar. 31, 2017 USD ($) Segment Customer	Mar. 31, 2016 USD ($) Customer	Mar. 31, 2015 USD ($)
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES [Abstract]
Number of reportable segments | Segment	2
Investments [Abstract]
Impairment losses	$ 0	$ 0	$ 0
Property, Plant and Equipment [Line Items]
Transfers of equipment between inventory and property and equipment, net	4,549	987	2,295
Valuation of Long-Lived Assets [Abstract]
Impairment of long-lived assets	$ 0	$ 13	1,941
Lease Programs [Abstract]
Period for instrument and consumable purchases under lease agreement	6 years	6 years
Lease receivables including accrued interest	$ 9,100	$ 2,100
Sales Incentive Programs [Abstract]
Promotional period	5 years
Advertising Expense [Abstract]
Advertising expense	$ 700	700	900
Income Taxes [Abstract]
Percentage to measure tax benefit	50.00%
Income tax penalties and interest expense on unrecognized tax benefits	$ 0	0	0
Income tax penalties and interest accrued on uncertain tax positions	0	0
Foreign currency [Abstract]
Foreign exchange gains and (losses)	$ (627)	$ 149	$ (1,794)
Minimum [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Life of extended maintenance contract	1 year
Maximum [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Life of extended maintenance contract	3 years
Machinery and Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	2 years
Machinery and Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	15 years
Furniture and Fixtures [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	3 years
Furniture and Fixtures [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	8 years
Computer Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	2 years
Computer Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	7 years
Building [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	25 years
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	Shorter of estimated useful life or remaining lease term
Units Held for Loan, Evaluation or Demonstration Purposes [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	3 years
Units Held for Loan, Evaluation or Demonstration Purposes [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	5 years
Intangible Assets [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated useful life	10 years
Accounts Receivable [Member] | Customer Concentration Risk [Member]
Concentration Risk [Line Items]
Number of major customers | Customer	3	2
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Distributor One [Member]
Concentration Risk [Line Items]
Accounts receivable by major customer	26.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Distributor Two [Member]
Concentration Risk [Line Items]
Accounts receivable by major customer	13.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Distributor Three [Member]
Concentration Risk [Line Items]
Accounts receivable by major customer	10.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Distributor Four [Member]
Concentration Risk [Line Items]
Accounts receivable by major customer		25.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Distributor Five [Member]
Concentration Risk [Line Items]
Accounts receivable by major customer		14.00%