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Government Programs - Additional Information (Detail)	1 Months Ended		3 Months Ended						9 Months Ended
Government Programs - Additional Information (Detail)	Jul. 31, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2016 AUD	Mar. 31, 2016 USD ($)	Mar. 31, 2016 AUD	Sep. 30, 2015 USD ($)	Sep. 30, 2015 AUD	Sep. 30, 2016 USD ($)	Sep. 30, 2016 AUD	Sep. 30, 2015 USD ($)	Sep. 30, 2015 AUD	Sep. 30, 2016 AUD	Dec. 31, 2015 USD ($)	Dec. 31, 2015 AUD
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Research and development tax incentive receivable			$ 1,944,000						$ 1,944,000					$ 715,000
SBIR Grant [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Reduction of research and development expenses related to tax			66,000				$ 0		135,000		$ 0
Research and development grants	$ 219,000	$ 224,000
Grants receivable		$ 155,000	65,000				155,000		65,000		155,000
Overseas Findings [Member] \| Australian Taxation Office [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Research and development tax incentive receivable			1,900,000						1,900,000				AUD 2,500,000	$ 715,000	AUD 978,000
Deferred tax incentive					$ 182,000	AUD 237,000
Research and Development Tax Incentive [Member] \| Australian Taxation Office [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Reduction of research and development expenses related to tax			$ 145,000	AUD 181,000			$ 127,000	AUD 194,000	$ 1,200,000	AUD 1,600,000	$ 337,000	AUD 464,000