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WARRANTY RESERVES (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Mar. 31, 2017
Change in accrued warranty reserve [Roll Forward]          
Balance at beginning of period $ 4,541 $ 3,576 $ 4,358 $ 3,208  
Provision for warranty expense 682 741 1,462 1,500  
Warranty costs incurred (464) (367) (1,061) (758)  
Balance at end of period 4,759 3,950 4,759 3,950  
Non-current portion of warranty reserve 2,825 2,411 2,825 2,411 $ 2,695
Current portion of warranty reserve 1,934 $ 1,539 1,934 $ 1,539 1,663
Instruments [Member]          
Change in accrued warranty reserve [Roll Forward]          
Balance at beginning of period     3,800    
Balance at end of period 4,100   $ 4,100    
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   $ 600   $ 600