WARRANTY RESERVES (Details) (USD $)	3 Months Ended		6 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 Instruments [Member]	Sep. 30, 2013 Reagent Discs [Member]	Mar. 31, 2013 Reagent Discs [Member]
Product Warranty Liability [Line Items]
Period of coverage for standard warranty obligation on instruments (in years)					one to three
Change in accrued warranty reserve [Roll Forward]
Balance at beginning of period	$ 1,327,000	$ 1,494,000	$ 1,384,000	$ 1,846,000
Provision for warranty expense	672,000	354,000	999,000	661,000
Warranty costs incurred	(386,000)	(368,000)	(770,000)	(737,000)
Adjustment to pre-existing warranties	0	0	0	(290,000)
Balance at end of period	1,613,000	1,480,000	1,613,000	1,480,000
Non-current portion of warranty reserve	741,000	437,000	741,000	437,000
Warranty reserve, balance at end of period						500,000	571,000
Current portion of warranty reserve	$ 872,000	$ 1,043,000	$ 872,000	$ 1,043,000		$ 500,000	$ 571,000