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Redeemable Convertible Preferred Stock - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Temporary Equity [Line Items]    
Accretion amount $ 30 $ 20
Series A Convertible Preferred Stock    
Temporary Equity [Line Items]    
Cumulative dividends at a rate 6.00%  
Redeemable convertible preferred stock, liquidation preference per share $ 5.00