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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 $)
Jun. 30, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Cost $ 94,994,849 $ 75,317,926
Gross Unrealized Gains 184,600 66,434
Gross Unrealized Losses (6,581) (29,808)
Estimated Fair Value 95,172,868 75,354,552
Cash and Cash Equivalents [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost 39,013,835 19,720,190
Gross Unrealized Gains 8,241 2,627
Gross Unrealized Losses (2,974) (4,060)
Estimated Fair Value 39,019,102 19,718,757
Time Deposits [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost 4,555,617 9,912,171
Gross Unrealized Gains 8,066 3,887
Gross Unrealized Losses      
Estimated Fair Value 4,563,683 9,916,058
Long-Term Investments [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost 51,425,397 45,685,565
Gross Unrealized Gains 168,293 59,920
Gross Unrealized Losses (3,607) (25,748)
Estimated Fair Value 51,590,083 45,719,737
Money Market Funds [Member] | Cash and Cash Equivalents [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost 38,989,224 19,631,550
Gross Unrealized Gains 8,241 2,619
Gross Unrealized Losses (2,970) (4,060)
Estimated Fair Value 38,994,495 19,630,109
Corporate Debt Securities [Member] | Cash and Cash Equivalents [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost 24,611 88,640
Gross Unrealized Gains    8
Gross Unrealized Losses (4)   
Estimated Fair Value 24,607 88,648
Corporate Debt Securities [Member] | Time Deposits [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost 2,664,044 4,393,594
Gross Unrealized Gains 5,245 2,271
Gross Unrealized Losses      
Estimated Fair Value 2,669,289 4,395,865
Corporate Debt Securities [Member] | Long-Term Investments [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost 19,124,836 20,804,125
Gross Unrealized Gains 108,531 59,437
Gross Unrealized Losses (3,607) (19,522)
Estimated Fair Value 19,229,760 20,844,040
Sovereign Debt Securities [Member] | Time Deposits [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost 1,891,573 5,518,577
Gross Unrealized Gains 2,821 1,616
Gross Unrealized Losses      
Estimated Fair Value 1,894,394 5,520,193
Sovereign Debt Securities [Member] | Long-Term Investments [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost 32,300,561 24,881,440
Gross Unrealized Gains 59,762 483
Gross Unrealized Losses    (6,226)
Estimated Fair Value $ 32,360,323 $ 24,875,697