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Stockholders' Equity - Equity Offerings (Detail) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	6 Months Ended
	Mar. 31, 2018	Jun. 30, 2018	Sep. 28, 2017
September 2017 Sales Agreement
Equity offerings
Common stock available for sale under agreement		$ 80.0
Securities sold during period		0
September 2017 Sales Agreement | Maximum
Equity offerings
Common stock available for sale under agreement			$ 100.0
Public Equity Offering | Common Stock
Equity offerings
Issuance of common stock, net of issuance costs, shares	8,050,000
Weighted average price per share issued	$ 17.00
Aggregate net proceeds from stock sale	$ 128.4

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