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Stockholders' Equity - Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Equity [Abstract]        
Beginning balance     $ 58  
Other comprehensive loss before reclassifications     (75)  
Amounts reclassified from accumulated other comprehensive income (loss)     0  
Net current-period other comprehensive loss $ (44) $ 6 (75) $ 9
Ending balance $ (17)   $ (17)