Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) |
12 Months Ended | |
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Dec. 31, 2018 |
Dec. 31, 2017 |
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| Summary of Significant Accounting Policies [line items] | ||
| Incremental funding | $ 45,000,000 | |
| Cash and cash equivalents expiring period | January 30,2019 | |
| Dilutive impact of exercise of outstanding stock options | 925,782 | 591,609 |
| Dilutive impact of exercise of warrants | 13,901,859 | 5,108,588 |
| Deficit [member] | ||
| Summary of Significant Accounting Policies [line items] | ||
| Comprehensive income (loss) | $ (22,639,272) | |
| Shareholders' deficiency | $ (172,937,694) | |
| Bottom of range [member] | ||
| Summary of Significant Accounting Policies [line items] | ||
| Interest rates | 2.18% | |
| Top of range [member] | ||
| Summary of Significant Accounting Policies [line items] | ||
| Interest rates | 2.32% | |
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- Definition The number of dilutive potential ordinary shares that relate to the assumed conversion of the entity's convertible instruments. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition The number of dilutive potential ordinary shares that relate to the assumed exercise of the entity's share options. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition The difference, for modified share-based payment arrangements, between the fair value of the modified equity instrument and that of the original equity instrument, both estimated as at the date of the modification. [Refer: Share-based payment arrangements [member]] Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Cash and cash equivalents expiring period description. No definition available.
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- Definition Cash and cash equivalents interest rate. No definition available.
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- Definition Comprehensive income (loss). No definition available.
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- Definition Line items representing the disclosure of summary of significant accounting policies. No definition available.
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- Definition Increase (decrease) in shareholder's equity. No definition available.
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