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Stockholders' Equity - Equity Offerings - 10Q (Detail) - Common Stock - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	6 Months Ended
	May 31, 2017	Jun. 30, 2017
At The Market Equity Offering
Equity offerings
Issuance of common stock, net of issuance costs, shares		1,388,647
Weighted average price per share issued		$ 5.550
Aggregate net proceeds from stock sale		$ 7.4
Public Equity Offering
Equity offerings
Issuance of common stock, net of issuance costs, shares	8,050,000
Weighted average price per share issued	$ 11.50
Aggregate net proceeds from stock sale	$ 86.8

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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=84159872&loc=d3e21463-112644

Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(28))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Name Accounting Standards Codification
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