WARRANTY RESERVES (Details) - USD ($)	3 Months Ended		9 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Mar. 31, 2016
Change in accrued warranty reserve [Roll Forward]
Balance at beginning of period	$ 3,950,000	$ 2,824,000	$ 3,208,000	$ 3,156,000
Provision for warranty expense	568,000	619,000	2,068,000	1,150,000
Warranty costs incurred	(325,000)	(349,000)	(1,083,000)	(989,000)
Adjustment to pre-existing warranties	0	0	0	(223,000)
Balance at end of period	4,193,000	3,094,000	4,193,000	3,094,000
Non-current portion of warranty reserve	2,616,000	1,822,000	2,616,000	1,822,000	$ 1,927,000
Current portion of warranty reserve	1,577,000	$ 1,272,000	$ 1,577,000	$ 1,272,000	1,281,000
Instruments [Member] | Minimum [Member]
Product Warranty Liabilities [Line Items]
Period of coverage for standard warranty obligation on instruments			1 year
Instruments [Member] | Maximum [Member]
Product Warranty Liabilities [Line Items]
Period of coverage for standard warranty obligation on instruments			5 years
Reagent Discs [Member]
Change in accrued warranty reserve [Roll Forward]
Current portion of warranty reserve	$ 600,000		$ 600,000		$ 500,000