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v2.4.1.9

Condensed Balance Sheets (Detail) (USD $) | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | --- | --- | ---
Current assets |  |  |  |
Cash and cash equivalents | $ 282,081,829 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 196,113,315 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 119,561,152 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 136,859,336 us-gaap_CashAndCashEquivalentsAtCarryingValue
Deferred tax assets | 3,522,054 us-gaap_DeferredTaxAssetsNetCurrent | 784,063 us-gaap_DeferredTaxAssetsNetCurrent |  |
Other current assets | 9,430,135 us-gaap_OtherAssetsCurrent | 4,695,947 us-gaap_OtherAssetsCurrent |  |
Total current assets | 366,365,993 us-gaap_AssetsCurrent | 262,706,996 us-gaap_AssetsCurrent |  |
Investment in subsidiaries and VIEs | 35,817,261 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures | 14,742,364 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures |  |
Non-current deferred tax assets | 2,262,489 us-gaap_DeferredTaxAssetsNetNoncurrent | 1,494,769 us-gaap_DeferredTaxAssetsNetNoncurrent |  |
Other non-current assets | 1,930,814 us-gaap_OtherAssetsNoncurrent | 1,220,033 us-gaap_OtherAssetsNoncurrent |  |
Total assets | 431,100,062 us-gaap_Assets | 303,254,657 us-gaap_Assets |  |
Current liabilities |  |  |  |
Other current liabilities | 27,259,639 us-gaap_OtherLiabilitiesCurrent | 15,227,247 us-gaap_OtherLiabilitiesCurrent |  |
Total current liabilities | 111,651,738 us-gaap_LiabilitiesCurrent | 62,813,010 us-gaap_LiabilitiesCurrent |  |
Uncertain tax position liabilities | 1,793,459 us-gaap_LiabilityForUncertainTaxPositionsNoncurrent | 1,650,399 us-gaap_LiabilityForUncertainTaxPositionsNoncurrent |  |
Other non-current liabilities | 5,004,281 us-gaap_OtherLiabilitiesNoncurrent | 3,596,295 us-gaap_OtherLiabilitiesNoncurrent |  |
Total liabilities | 118,449,478 us-gaap_Liabilities | 68,059,704 us-gaap_Liabilities |  |
Shareholders' equity |  |  |  |
Ordinary shares ($0.0005 par value): 94,100,000 shares authorized, 28,715,882 shares issued and 27,648,066 shares outstanding as of December 31, 2013 and 29,123,118 shares issued and 28,055,302 shares outstanding as of December 31, 2014 | 14,561 us-gaap_CommonStockValue | 14,358 us-gaap_CommonStockValue |  |
Treasury stock (1,067,816 ordinary shares at both December 31, 2013 and December 31, 2014) | (11,675,955)us-gaap_TreasuryStockValue | (11,675,955)us-gaap_TreasuryStockValue |  |
Additional paid-in capital | 135,640,392 us-gaap_AdditionalPaidInCapitalCommonStock | 129,687,092 us-gaap_AdditionalPaidInCapitalCommonStock |  |
Retained earnings | 169,525,124 us-gaap_RetainedEarningsAccumulatedDeficit | 97,118,620 us-gaap_RetainedEarningsAccumulatedDeficit |  |
Accumulated other comprehensive income | 5,118,141 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | 9,281,049 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax |  |
Total shareholders' equity | 298,622,263 us-gaap_StockholdersEquity | 224,425,164 us-gaap_StockholdersEquity |  |
Total Liabilities and Equity | 431,100,062 us-gaap_LiabilitiesAndStockholdersEquity | 303,254,657 us-gaap_LiabilitiesAndStockholdersEquity |  |
Parent Company |  |  |  |
Current assets |  |  |  |
Cash and cash equivalents | 28,871,793 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 42,689,231 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 50,987,910 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 84,371,832 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Due from subsidiaries and VIEs | 36,220,656 us-gaap_DueFromAffiliateCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 38,453,506 us-gaap_DueFromAffiliateCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Deferred tax assets | 78,574 us-gaap_DeferredTaxAssetsNetCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 64,755 us-gaap_DeferredTaxAssetsNetCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Other current assets | 4,143,658 us-gaap_OtherAssetsCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 730,102 us-gaap_OtherAssetsCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total current assets | 69,314,681 us-gaap_AssetsCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 81,937,594 us-gaap_AssetsCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Investment in subsidiaries and VIEs | 232,083,557 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 144,678,555 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Non-current deferred tax assets | 430,578 us-gaap_DeferredTaxAssetsNetNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 389,615 us-gaap_DeferredTaxAssetsNetNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Other non-current assets | 50,000 us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |
Total assets | 301,878,816 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 227,005,764 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Current liabilities |  |  |  |
Other current liabilities | 1,185,921 us-gaap_OtherLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 691,734 us-gaap_OtherLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total current liabilities | 1,185,921 us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 691,734 us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Uncertain tax position liabilities | 774,284 us-gaap_LiabilityForUncertainTaxPositionsNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 605,820 us-gaap_LiabilityForUncertainTaxPositionsNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Other non-current liabilities | 1,296,348 us-gaap_OtherLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,283,046 us-gaap_OtherLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total liabilities | 3,256,553 us-gaap_Liabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2,580,600 us-gaap_Liabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Shareholders' equity |  |  |  |
Ordinary shares ($0.0005 par value): 94,100,000 shares authorized, 28,715,882 shares issued and 27,648,066 shares outstanding as of December 31, 2013 and 29,123,118 shares issued and 28,055,302 shares outstanding as of December 31, 2014 | 14,561 us-gaap_CommonStockValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 14,358 us-gaap_CommonStockValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Treasury stock (1,067,816 ordinary shares at both December 31, 2013 and December 31, 2014) | (11,675,955)us-gaap_TreasuryStockValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (11,675,955)us-gaap_TreasuryStockValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Additional paid-in capital | 135,640,392 us-gaap_AdditionalPaidInCapitalCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 129,687,092 us-gaap_AdditionalPaidInCapitalCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Retained earnings | 169,525,124 us-gaap_RetainedEarningsAccumulatedDeficit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 97,118,620 us-gaap_RetainedEarningsAccumulatedDeficit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Accumulated other comprehensive income | 5,118,141 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 9,281,049 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total shareholders' equity | 298,622,263 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 224,425,164 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total Liabilities and Equity | $ 301,878,816 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 227,005,764 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |

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