Basis of Presentation - Additional Information (Detail) - USD ($) |
3 Months Ended | 12 Months Ended | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2017 |
Sep. 30, 2017 |
Jun. 30, 2017 |
Mar. 31, 2017 |
Dec. 31, 2016 |
Sep. 30, 2016 |
Jun. 30, 2016 |
Mar. 31, 2016 |
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2013 |
Dec. 31, 2012 |
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| Organization, Consolidation and Presentation of Financial Statements [Abstract] | ||||||||||||
| Net loss | $ 1,460,733 | $ 2,067,230 | $ 1,220,866 | $ 1,982,696 | $ 2,674,797 | $ 1,963,007 | $ 312,615 | $ 2,062,885 | $ 6,731,525 | $ 7,013,304 | ||
| Cash used in operations | 6,363,853 | 7,075,085 | ||||||||||
| Accumulated deficit | $ (101,400,797) | $ (94,669,272) | (101,400,797) | (94,669,272) | ||||||||
| Gross proceeds from issuance of preferred and common stock | $ 9,684,799 | $ 4,666,667 | $ 14,900,000 | $ 13,000,000 | ||||||||
| 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://www.xbrl.org/2003/role/presentationRef
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- 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/presentationRef
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- References No definition available.
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| X | ||||||||||
- Definition The cash inflow from the issuance of common stock, preferred stock, treasury stock, stock options, and other types of equity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The cumulative amount of the reporting entity's undistributed earnings or deficit. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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