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Supplemental Cash Flow Data - Supplemental Cash Flow Information (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Supplemental Cash Flow Elements [Abstract]      
Cash paid for interest   $ 3 $ 41
Cash paid for income taxes 1 1 1
Significant non-cash investing and financing activities:      
Purchases of property and equipment through accounts payable 193 116 13
Purchases of property and equipment through accrued liabilities (2) 37  
Purchases of property and equipment through trade in value of disposed property and equipment $ 81