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Government Programs - Additional Information (Detail)
 1 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2016
USD ($)
Dec. 31, 2016
AUD
Oct. 31, 2016
USD ($)
Oct. 31, 2016
AUD
Jul. 31, 2016
USD ($)
Sep. 30, 2015
USD ($)
Mar. 31, 2016
USD ($)
Mar. 31, 2016
AUD
Dec. 31, 2016
USD ($)
Dec. 31, 2016
AUD
Dec. 31, 2015
USD ($)
Dec. 31, 2015
AUD
Dec. 31, 2014
USD ($)
Dec. 31, 2014
AUD
Dec. 31, 2016
AUD
Dec. 31, 2015
AUD
Government Programs [Line Items]                                
Research and development tax incentive receivable $ 2,241,000               $ 2,241,000   $ 715,000          
Maximum [Member]                                
Government Programs [Line Items]                                
Research and development tax incentives | AUD                   AUD 20,000,000            
Tax incentive rate related to research and development                 50.00% 50.00%            
SBIR Grant [Member]                                
Government Programs [Line Items]                                
Reduction of research and development expenses related to tax                 $ 169,000   155,000          
Research and development grants         $ 219,000 $ 224,000                    
Grants receivable $ 100,000               100,000   155,000          
Australian Taxation Office [Member]                                
Government Programs [Line Items]                                
Research and development tax incentives     $ 2,200,000 AUD 3,000,000                        
Australian Taxation Office [Member] | Research and Development Tax Incentive Receivable [Member]                                
Government Programs [Line Items]                                
Research and development tax incentives     700,000 1,000,000                        
Australian Taxation Office [Member] | Maximum [Member]                                
Government Programs [Line Items]                                
Tax incentive rate related to research and development 50.00% 50.00%                            
Overseas Findings [Member] | Australian Taxation Office [Member]                                
Government Programs [Line Items]                                
Research and development tax incentive receivable $ 2,200,000               2,200,000   715,000       AUD 3,100,000 AUD 978,000
Deferred tax incentive     $ 1,500,000 AUD 2,000,000     $ 182,000 AUD 237,000                
Research and Development Tax Incentive [Member] | Australian Taxation Office [Member]                                
Government Programs [Line Items]                                
Reduction of research and development expenses related to tax $ 1,600,000 AUD 2,200,000             $ 4,000,000 AUD 5,300,000 $ 736,000 AUD 978,000 $ 577,000 AUD 639,000