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Net (Loss) Income Per Share of Common Stock (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, 2015
Net (Loss) Income Per Common Share
Net loss	$ (9,257,858)	$ (7,950,101)	$ (8,141,796)	$ (7,931,313)	$ (8,328,597)	$ (7,854,693)	$ (8,071,570)	$ (7,554,978)	$ (33,281,068)	$ (31,809,838)	$ (12,769,498)
Basic and diluted net loss per common share (in dollars per share)	$ (0.27)	$ (0.24)	$ (0.30)	$ (0.34)	$ (0.36)	$ (0.34)	$ (0.41)	$ (0.40)	$ (1.13)	$ (1.50)	$ (0.67)
Basic and diluted weighted average common shares outstanding									29,395,756	21,256,312	19,010,587
Warrants [Member]
Anti-dilutive securities excluded
Anti-dilutive securities									553,868	553,868	578,687
Stock Options and Restricted Stock Units [Member]
Anti-dilutive securities excluded
Anti-dilutive securities									3,399,124	2,817,674	2,235,775

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- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

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The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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-Publisher FASB
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Average number of shares or units issued and outstanding that are used in calculating basic and diluted earnings per share (EPS).

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