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Net (Loss) Income Per Share of Common Stock (Detail) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Net (Loss) Income Per Common Share
Net loss	$ (8,328,597)	$ (7,854,693)	$ (8,071,570)	$ (7,554,978)	$ (8,881,703)	$ (7,168,071)	$ 10,389,405	$ (7,109,129)	$ (31,809,838)	$ (12,769,498)	$ (11,121,566)
Basic and diluted net loss per common share (in dollars per share)	$ (0.36)	$ (0.34)	$ (0.41)	$ (0.40)					$ (1.50)	$ (0.67)	$ (0.60)
Basic and diluted weighted average common shares outstanding									21,256,312	19,010,587	18,452,252
Warrants [Member]
Anti-dilutive securities excluded
Anti-dilutive securities									553,868	578,687	590,595
Stock Options and Restricted Stock Units [Member]
Anti-dilutive securities excluded
Anti-dilutive securities									2,817,674	2,235,775	1,806,980

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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6510752

Reference 3: http://www.xbrl.org/2003/role/presentationRef
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Net Income
-URI http://asc.fasb.org/extlink&oid=51831255

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
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