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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition (Details) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2015
Dec. 31, 2014
Revenue Recognition      
Product return reserve as percentage of product sales   1.50%  
Product return reserve   $ 6.7  
Foreign Currency      
Gain on foreign currency translation $ 0.2 $ 1.4 $ 0.6