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Subsequent Events - Additional Information (Detail)
 1 Months Ended 3 Months Ended 9 Months Ended
Oct. 31, 2016
USD ($)
Oct. 31, 2016
AUD
Mar. 31, 2016
USD ($)
Mar. 31, 2016
AUD
Sep. 30, 2016
AUD
Maximum [Member]          
Subsequent Event [Line Items]          
Research and development tax incentives | AUD         AUD 20,000,000
Tax incentive rate related to research and development         50.00%
Australian Taxation Office [Member] | Subsequent Event [Member] | Maximum [Member]          
Subsequent Event [Line Items]          
Tax incentive rate related to research and development 50.00% 50.00%      
Australian Taxation Office [Member] | Overseas Findings [Member]          
Subsequent Event [Line Items]          
Deferred tax incentive     $ 182,000 AUD 237,000  
Australian Taxation Office [Member] | Overseas Findings [Member] | Subsequent Event [Member]          
Subsequent Event [Line Items]          
Research and development tax incentives $ 2,200,000 AUD 3,000,000      
Reduction of research and development expenses related to tax 700,000        
Deferred tax incentive $ 1,500,000