Subsequent Events - Additional Information (Detail) - At The Market Offering Program [Member] - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	2 Months Ended	3 Months Ended
	Mar. 31, 2017	May 31, 2017	Mar. 31, 2017
Subsequent Event [Line Items]
Average market price per share	$ 5.64		$ 5.64
Aggregate net proceeds from issuance of common stock	$ 21,900		$ 21,921
Subsequent Event
Subsequent Event [Line Items]
Average market price per share		$ 7.04
Aggregate net proceeds from issuance of common stock		$ 7,400
Common Stock
Subsequent Event [Line Items]
Stock issued during period	3,884,234
Common Stock | Subsequent Event
Subsequent Event [Line Items]
Stock issued during period		1,100,000