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Segment and Enterprise Wide Disclosures - Additional Information (Detail)
$ in Thousands
1 Months Ended 12 Months Ended
Feb. 28, 2017
USD ($)
Mar. 31, 2017
USD ($)
Segment
Mar. 31, 2016
USD ($)
Mar. 31, 2015
USD ($)
Segment Reporting Information [Line Items]        
Number of business segments | Segment   1    
Acquisition cost for property and equipment   $ 50,415 $ 15,624 $ 5,188
International        
Segment Reporting Information [Line Items]        
Percentage of total product revenue   9.00% 8.00% 10.00%
Long-lived assets   $ 23,200 $ 5,900  
Europe        
Segment Reporting Information [Line Items]        
Acquisition cost for property and equipment $ 12,600