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Stockholders' Equity - Equity Offerings - 10Q (Detail) - At The Market Equity Offering - Common Stock - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	3 Months Ended	13 Months Ended
	May 03, 2017	Mar. 31, 2017	Mar. 31, 2017
Equity offerings
Issuance of common stock, net of issuance costs, shares	784,416	604,231	1,273,022
Weighted average price per share issued	$ 4.98	$ 6.284	$ 6.284
Aggregate net proceeds from stock sale	$ 3.8	$ 3.7	$ 7.5

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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