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Summary of Significant Accounting Policies - Summary of Other Assets (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Summary of Other Assets  
Cost $ 590
Accumulated Amortization 422
Net Value 168
Patents
  
Summary of Other Assets  
Useful Lives 18 years
Cost 95
Accumulated Amortization 77
Net Value 18
Customer agreements
  
Summary of Other Assets  
Useful Lives 10 years
Cost 173
Accumulated Amortization 148
Net Value 25
Intellectual property
  
Summary of Other Assets  
Useful Lives 3 years
Cost 322
Accumulated Amortization 197
Net Value $ 125