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Stockholders' Equity - Equity Offerings (Detail) - USD ($)	1 Months Ended	7 Months Ended	9 Months Ended
	Jun. 30, 2016	Sep. 30, 2016	Sep. 30, 2016
Equity offerings
Aggregate net proceeds from stock sale			$ 22,453,785
At The Market Equity Offering | Common Stock
Equity offerings
Issuance of common stock, net of issuance costs, shares		483,298
Weighted average price per share issued		$ 6.296	$ 6.296
Aggregate net proceeds from stock sale		$ 2,700,000
Public Equity Offering | Common Stock
Equity offerings
Issuance of common stock, net of issuance costs, shares	3,476,793
Weighted average price per share issued	$ 6.10
Aggregate net proceeds from stock sale	$ 19,700,000

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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