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Government Programs - Additional Information (Detail) | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
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 |  |  |

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- Definition Carrying amount as of the balance sheet date of amounts due under the terms of governmental, corporate, or foundation grants. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.8) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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