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Significant Accounting Policies - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2017
Summary Of Significant Accounting Policies [Line Items]    
Cash and cash equivalents maturity period, maximum   90 days
Income tax expense $ 59 $ 1,098
ASU 2016-09 [Member]    
Summary Of Significant Accounting Policies [Line Items]    
Income tax expense $ 59 $ 1,098
Decrease in earnings per share basic and diluted   $ 0.01