Basis of Presentation - Additional Information (Detail) - USD ($) |
3 Months Ended | 6 Months Ended | |||||
|---|---|---|---|---|---|---|---|
Jun. 30, 2019 |
Mar. 31, 2019 |
Jun. 30, 2018 |
Mar. 31, 2018 |
Jun. 30, 2019 |
Jun. 30, 2018 |
Dec. 31, 2018 |
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| Organization Consolidation And Presentation Of Financial Statements [Abstract] | |||||||
| Net loss | $ 4,806,460 | $ 3,325,717 | $ 2,281,289 | $ 2,119,397 | $ 8,132,177 | $ 4,400,686 | |
| Cash used in operations | 5,698,622 | $ 3,647,459 | |||||
| Accumulated deficit | $ 119,918,999 | $ 119,918,999 | $ 111,373,608 | ||||
| X | ||||||||||
- Definition Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition The cumulative amount of the reporting entity's undistributed earnings or deficit. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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