WARRANTY RESERVES (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Mar. 31, 2014
Change in accrued warranty reserve [Roll Forward]
Balance at beginning of period	$ 1,873	$ 1,327	$ 1,868	$ 1,384
Provision for warranty expense	656	672	1,048	999
Warranty costs incurred	(344)	(386)	(731)	(770)
Balance at end of period	2,185	1,613	2,185	1,613
Non-current portion of warranty reserve	992	741	992	741	821
Current portion of warranty reserve	1,193	872	1,193	872	1,047
Instruments [Member]
Product Warranty Liability [Line Items]
Period of coverage for standard warranty obligation on instruments (in years)			one to five
Change in period of coverage for standard warranty obligation on certain instruments (in years)			three to five
Change in accrued warranty reserve [Roll Forward]
Warranty reserve, balance at end of period	1,700		1,700		1,200
Reagent Discs [Member]
Change in accrued warranty reserve [Roll Forward]
Current portion of warranty reserve	478		478		619
Warranty reserve, balance at end of period	$ 478		$ 478		$ 619