Summary of Significant Accounting Policies - Additional Information (Detail) |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
|
Sep. 30, 2018
USD ($)
Securities
|
Sep. 30, 2017
USD ($)
Securities
|
Sep. 30, 2018
USD ($)
Securities
|
Sep. 30, 2017
USD ($)
Securities
|
|
| Accounting Policies [Abstract] | ||||
| Maturity period of highly liquid investments | Three months or less | |||
| Realized gains or losses on marketable securities | $ 0 | $ 0 | $ 0 | $ 0 |
| Number of securities in unrealized loss position for more than 12 months | Securities | 0 | 0 | 0 | 0 |
| Grants receivable recognized | $ 338,000 | $ 250,000 | $ 1,102,000 | $ 806,000 |
| Grants receivable | 564,000 | 564,000 | ||
| Grants remaining to be awarded | $ 952,580 | $ 952,580 | ||
| X | ||||||||||
- Definition Decrease in research and development expenses related to grants recognized. No definition available.
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| X | ||||||||||
- Definition Grants remaining to be awarded. No definition available.
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| X | ||||||||||
- Definition Highly Liquid Investments Maturity Period No definition available.
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| X | ||||||||||
- Definition Receivable from grants for costs incurred. No definition available.
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Number of investment positions in available-for-sale investments that have been in a continuous unrealized loss position for greater than or equal to a year for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement. No definition available.
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| X | ||||||||||
- Definition Amount of realized gain (loss) on investment in marketable security, including other-than-temporary impairment (OTTI). No definition available.
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