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Deferred Revenue - Summary of Deferred Revenue (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Mar. 31, 2017
Current    
Payments in advance of services $ 557 $ 717
Advance billings 2,104 4,014
Others 247 747
Total 2,908 5,478
Non-current    
Payments in advance of services 550 359
Advance billings 2  
Others 19 19
Total $ 571 $ 378