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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

X
- Definition Amount of accumulated pre-tax unrealized gain before deducting pre-tax unrealized losses on investments in available-for-sale securities impacting investments. + References No definition available. + Details
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