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Common Stock Issuance - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 9 Months Ended
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Feb. 28, 2017 | Sep. 30, 2017 | Sep. 30, 2016
Proceeds from Issuance or Sale of Equity [Abstract] |  |  |
Number of common stock issued | 834,896 |  |
Weighted average sale price for common stock issuance | $ 23.96 |  |
Gross proceeds from common stock issuance | $ 20,000 |  |
Net proceeds from common stock issuance | $ 19,300 | $ 19,294 | $ 0

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