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Fair Value Measurement of Assets and Liabilities - Fair Value of Money Market Funds, Short and Long-Term Investments Classified as Available for Sale Securities (Detail) (USD $)
Mar. 31, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Cost $ 80,703,410 $ 75,317,926
Gross Unrealized Gains 94,708 66,434
Gross Unrealized Losses (39,498) (29,808)
Estimated Fair Value 80,758,620 75,354,552
Cash and Cash Equivalents [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost 28,534,910 19,720,190
Gross Unrealized Gains 4,628 2,627
Gross Unrealized Losses (4,066) (4,060)
Estimated Fair Value 28,535,472 19,718,757
Time Deposits [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost 7,802,010 9,912,171
Gross Unrealized Gains 7,640 3,887
Estimated Fair Value 7,809,650 9,916,058
Long-Term Investments [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost 44,366,490 45,685,565
Gross Unrealized Gains 82,440 59,920
Gross Unrealized Losses (35,432) (25,748)
Estimated Fair Value 44,413,498 45,719,737
Money Market Funds [Member] | Cash and Cash Equivalents [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost 28,529,873 19,631,550
Gross Unrealized Gains 4,628 2,619
Gross Unrealized Losses (4,062) (4,060)
Estimated Fair Value 28,530,439 19,630,109
Corporate Debt Securities [Member] | Cash and Cash Equivalents [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost 5,037 88,640
Gross Unrealized Gains   8
Gross Unrealized Losses (4)  
Estimated Fair Value 5,033 88,648
Corporate Debt Securities [Member] | Time Deposits [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost 5,144,257 4,393,594
Gross Unrealized Gains 5,184 2,271
Estimated Fair Value 5,149,441 4,395,865
Corporate Debt Securities [Member] | Long-Term Investments [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost 16,358,275 20,804,125
Gross Unrealized Gains 81,607 59,437
Gross Unrealized Losses (5,115) (19,522)
Estimated Fair Value 16,434,767 20,844,040
Sovereign Debt Securities [Member] | Time Deposits [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost 2,657,753 5,518,577
Gross Unrealized Gains 2,456 1,616
Estimated Fair Value 2,660,209 5,520,193
Sovereign Debt Securities [Member] | Long-Term Investments [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost 28,008,215 24,881,440
Gross Unrealized Gains 833 483
Gross Unrealized Losses (30,317) (6,226)
Estimated Fair Value $ 27,978,731 $ 24,875,697