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Changes in Accumulated Other Comprehensive Income (Detail)
 6 Months Ended
Jun. 30, 2015
USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Balance at December 31, 2014 $ (5,773,142)
Other comprehensive income/(loss) before reclassifications (2,423,902)
Amounts reclassified from accumulated other comprehensive income 0
Net current period other comprehensive income/(loss) (2,423,902)
Balance at June 30, 2015 (8,197,044)
Accumulated Net Unrealized Investment Gain (Loss)  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Balance at December 31, 2014 (33,054)
Other comprehensive income/(loss) before reclassifications (22,331)
Amounts reclassified from accumulated other comprehensive income 0
Net current period other comprehensive income/(loss) (22,331)
Balance at June 30, 2015 (55,385)
Accumulated Translation Adjustment  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Balance at December 31, 2014 (5,740,088)
Other comprehensive income/(loss) before reclassifications (2,401,571)
Amounts reclassified from accumulated other comprehensive income 0
Net current period other comprehensive income/(loss) (2,401,571)
Balance at June 30, 2015 $ (8,141,659)