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Stockholders' Equity - Additional Information (Detail) - USD ($)	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	May 05, 2016
Stockholders Equity Note [Line Items]
Net proceeds from issuance of common stock	$ 9,644,000	$ 14,547,000
Cantor | Sales Agreement | Amendment No. 2
Stockholders Equity Note [Line Items]
Maximum common stock offering price	132,200,000
Common stock registered for sale	$ 51,400,000		$ 70,000,000
Percentage of proceeds payable as compensation to underwriter	2.00%
Common stock, number of shares issued	4,200,000
Net proceeds from issuance of common stock	$ 10,700,000

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