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Business Combinations - Pro Forma Financial Information (Detail) - Creagh Medical and NorMedix [Member] - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2015
Mar. 31, 2016
Mar. 31, 2015
Business Acquisition [Line Items]      
Revenue $ 15,267 $ 34,289 $ 30,063
Net income $ 1,734 $ 2,854 $ 3,997
Per share amounts:      
Basic net income per share $ 0.13 $ 0.22 $ 0.31
Diluted net income per share $ 0.13 $ 0.22 $ 0.30