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Organization and Summary of Significant Accounting Policies - Additional Information (Detail) - shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Property, Plant and Equipment [Line Items]      
Percentage of cash proceeds from monetization of recovered cargo 80.00%    
Percentage of subsequent cash proceeds after priority recoupment 45.00%    
Short-term investment maturity period Three months or less    
Weighted average number of common shares outstanding 7,413,602 7,072,553 6,677,402
Receiver [Member]      
Property, Plant and Equipment [Line Items]      
Percentage of cash proceeds from monetization of recovered cargo 20.00%    
Percentage of subsequent cash proceeds after priority recoupment 55.00%    
Minimum [Member]      
Property, Plant and Equipment [Line Items]      
Property and Equipment, estimated useful life 3 years    
Maximum [Member]      
Property, Plant and Equipment [Line Items]      
Property and Equipment, estimated useful life 30 years