WARRANTY RESERVES (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Change in accrued warranty reserve [Roll Forward]
Balance at beginning of period	$ 3,208	$ 3,156	$ 1,868
Provision for warranty expense	2,621	1,615	2,647
Warranty costs incurred	(1,471)	(1,340)	(1,359)
Adjustment to pre-existing warranties	0	(223)	0
Balance at end of period	4,358	3,208	3,156
Non-current portion of warranty reserve	2,695	1,927	1,733
Current portion of warranty reserve	$ 1,663	1,281	1,423
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]
Provision for warranty expense	$ 400	400	$ 200
Warranty reserve, balance at end of period	$ 600	$ 500