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Financial Instruments - Cash and Cash Equivalents and Restricted Cash (Detail) - USD ($)
Mar. 31, 2016
Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 11,096,895 $ 14,533,065
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value 11,096,895 14,533,065
Restricted Cash [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 2,422,500 2,422,500
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value 2,422,500 2,422,500
Cash [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 690,078 830,190
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value 690,078 830,190
Cash equivalents [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 7,984,317 11,280,375
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value $ 7,984,317 $ 11,280,375