|
Other Income (Loss), Net (Details) (USD $)
|
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2014
|
Dec. 31, 2013
|
Dec. 31, 2012
|
|
| Other Income (Loss), Net | |||
| Gains on marketable securities, realized portion | $ 2,903,786 | $ 234,338 | $ 734,904 |
| Gains (loss) on marketable securities, unrealized portion | 804,621 | ||
| Foreign exchange gain (loss) | 613,227 | (862,383) | (379,530) |
| Amortized discounts related to liability for exclusive rights with Baidu | (52,922) | (935,177) | (1,882,804) |
| Others | 393,448 | 512,007 | (10,061) |
| Total other income (loss) | $ 3,857,539 | $ (1,051,215) | $ (732,870) |