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Stockholders' Equity - Accumulated Other Comprehensive Income (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance     $ 58  
Net current-period other comprehensive loss $ 3 $ 6 (31) $ 3
Ending balance 27   27  
Marketable Securities [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance     58  
Other comprehensive loss before reclassifications     (31)  
Amounts reclassified from accumulated other comprehensive loss     0  
Net current-period other comprehensive loss     (31)  
Ending balance $ 27   $ 27