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CONSOLIDATED BALANCE SHEETS(USD ($))
Dec. 31, 2014
Dec. 31, 2013
Current assets    
Cash and cash equivalents $ 105,093,178us-gaap_CashAndCashEquivalentsAtCarryingValue $ 123,427,729us-gaap_CashAndCashEquivalentsAtCarryingValue
Term deposits 16,907,346us-gaap_OtherShortTermInvestments 4,448,839us-gaap_OtherShortTermInvestments
Available-for-sale securities 20,013,487us-gaap_AvailableForSaleSecuritiesCurrent   
Held-to-maturity securities 24,358,555us-gaap_HeldToMaturitySecuritiesCurrent 51,866,479us-gaap_HeldToMaturitySecuritiesCurrent
Accounts receivables, net of allowance of $342,442 and $316,966 as of December 31, 2013 and 2014 30,244,289us-gaap_AccountsReceivableNetCurrent 17,230,844us-gaap_AccountsReceivableNetCurrent
Prepaid expenses and other current assets 19,069,904us-gaap_PrepaidExpenseAndOtherAssetsCurrent 7,762,570us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Restricted cash 53,375,960us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue   
Total current assets 269,062,719us-gaap_AssetsCurrent 204,736,461us-gaap_AssetsCurrent
Rental deposits 1,444,524us-gaap_DepositsAssetsNoncurrent 797,372us-gaap_DepositsAssetsNoncurrent
Property and equipment, net 5,659,191us-gaap_PropertyPlantAndEquipmentNet 5,842,522us-gaap_PropertyPlantAndEquipmentNet
Long-term investments    1,999,999us-gaap_LongTermInvestments
Goodwill 90,019,108us-gaap_Goodwill 90,266,629us-gaap_Goodwill
Acquired intangible assets, net 55,509,804us-gaap_IntangibleAssetsNetExcludingGoodwill 78,726,587us-gaap_IntangibleAssetsNetExcludingGoodwill
Restricted cash 10,885,357us-gaap_RestrictedCashAndCashEquivalentsNoncurrent 36,870,739us-gaap_RestrictedCashAndCashEquivalentsNoncurrent
Total assets 432,580,703us-gaap_Assets 419,240,309us-gaap_Assets
Current liabilities    
Accounts payable (including accounts payable of the consolidated variable interest entities ("VIEs") without recourse to the Company of $39,488,204 and $31,546,430 as of December 31, 2013 and 2014, respectively) 31,599,317us-gaap_AccountsPayableCurrent 39,514,379us-gaap_AccountsPayableCurrent
Accrued expenses and other current liabilities (including accrued expenses and other current liabilities of the consolidated VIEs without recourse to the Company of $15,437,141 and $13,469,803 as of December 31, 2013 and 2014, respectively) 16,580,351kz_AccruedExpensesAndOtherCurrentLiabilities 19,224,723kz_AccruedExpensesAndOtherCurrentLiabilities
Short-term bank loan (including short-term bank loan of the consolidated VIEs without recourse to the Company of $nil and $nil as of December 31, 2013 and 2014, respectively) 42,428,890us-gaap_ShortTermBankLoansAndNotesPayable   
Deferred revenue (including deferred revenue of the consolidated VIEs without recourse to the Company of $2,262,223 and $4,622,404 as of December 31, 2013 and 2014, respectively) 4,652,010us-gaap_DeferredRevenueCurrent 2,262,223us-gaap_DeferredRevenueCurrent
Income tax payable (including income tax payable of the consolidated VIEs without recourse to the Company of $322,714 and $1,223,526 as of December 31, 2013 and 2014, respectively) 5,529,899us-gaap_AccruedIncomeTaxesCurrent 6,369,482us-gaap_AccruedIncomeTaxesCurrent
Total current liabilities 100,790,467us-gaap_LiabilitiesCurrent 67,370,807us-gaap_LiabilitiesCurrent
Commitments and contingencies (Note 30)      
Long-term liabilities (including long-term liabilities of the consolidated VIEs without recourse to the Company of $19,260,000 and $9,860,000 as of December 31, 2013 and 2014, respectively) 9,860,000us-gaap_LongTermDebtNoncurrent 19,260,000us-gaap_LongTermDebtNoncurrent
Total liabilities 110,650,467us-gaap_Liabilities 86,630,807us-gaap_Liabilities
Ordinary shares ($0.0000005 par value; 1,000,000,000,000 shares authorized, 1,834,883,063 and 1,882,073,063 shares issued and outstanding as of December 31, 2013 and 2014, respectively) 942us-gaap_CommonStockValue 918us-gaap_CommonStockValue
Additional paid-in capital 162,687,212us-gaap_AdditionalPaidInCapitalCommonStock 152,052,241us-gaap_AdditionalPaidInCapitalCommonStock
Warrants 5,548,000us-gaap_WarrantsAndRightsOutstanding 10,419,000us-gaap_WarrantsAndRightsOutstanding
Accumulated other comprehensive income 57,531,228us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax 55,563,102us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Statutory reserves 11,467,537us-gaap_RetainedEarningsAppropriated 10,723,748us-gaap_RetainedEarningsAppropriated
Retained earnings 84,695,317us-gaap_RetainedEarningsUnappropriated 103,850,493us-gaap_RetainedEarningsUnappropriated
Total shareholders' equity 321,930,236us-gaap_StockholdersEquity 332,609,502us-gaap_StockholdersEquity
Total liabilities and shareholders' equity $ 432,580,703us-gaap_LiabilitiesAndStockholdersEquity $ 419,240,309us-gaap_LiabilitiesAndStockholdersEquity