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Commitments and Contingencies - Changes in Warranty Reserves (Detail) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Changes in warranty reserves    
Beginning balance $ 304  
Ending balance 304  
Warranty Reserves [Member]    
Changes in warranty reserves    
Beginning balance 304 $ 305
Provisions for warranties 16 13
Consumption of reserves (16) (38)
Ending balance $ 304 $ 280