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Convertible and redeemable preferred shares (Schedule of Changes in Preferred Shares) (Details)
 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Apr. 30, 2012
CNY
Dec. 31, 2014
USD ($)
Dec. 31, 2014
CNY
Dec. 31, 2013
CNY
Dec. 31, 2012
CNY
Sep. 30, 2013
Series A Preferred Stock [Member]
USD ($)
Sep. 30, 2013
Series A Preferred Stock [Member]
CNY
Apr. 30, 2012
Series A Preferred Stock [Member]
USD ($)
Apr. 30, 2012
Series A Preferred Stock [Member]
CNY
Dec. 31, 2014
Series A Preferred Stock [Member]
CNY
Dec. 31, 2013
Series A Preferred Stock [Member]
CNY
Dec. 31, 2012
Series A Preferred Stock [Member]
CNY
Dec. 31, 2014
Series A Preferred Stock [Member]
USD ($)
Sep. 30, 2013
Series A-1 Preferred Stock [Member]
USD ($)
Sep. 30, 2013
Series A-1 Preferred Stock [Member]
CNY
Dec. 31, 2014
Series A-1 Preferred Stock [Member]
CNY
Dec. 31, 2013
Series A-1 Preferred Stock [Member]
CNY
Dec. 31, 2012
Series A-1 Preferred Stock [Member]
CNY
Dec. 31, 2014
Series A-1 Preferred Stock [Member]
USD ($)
May 03, 2012
Series B Preferred Stock [Member]
USD ($)
May 03, 2012
Series B Preferred Stock [Member]
CNY
Dec. 31, 2014
Series B Preferred Stock [Member]
CNY
Dec. 31, 2013
Series B Preferred Stock [Member]
CNY
Dec. 31, 2012
Series B Preferred Stock [Member]
CNY
Dec. 31, 2014
Series B Preferred Stock [Member]
USD ($)
Jul. 31, 2013
Series B-1 Preferred Stock [Member]
USD ($)
Jul. 31, 2013
Series B-1 Preferred Stock [Member]
CNY
Dec. 31, 2014
Series B-1 Preferred Stock [Member]
CNY
Dec. 31, 2013
Series B-1 Preferred Stock [Member]
CNY
Dec. 31, 2012
Series B-1 Preferred Stock [Member]
CNY
Dec. 31, 2014
Series B-1 Preferred Stock [Member]
USD ($)
Sep. 30, 2013
Series C Preferred Stock [Member]
USD ($)
Sep. 30, 2013
Series C Preferred Stock [Member]
CNY
Dec. 31, 2014
Series C Preferred Stock [Member]
CNY
Dec. 31, 2013
Series C Preferred Stock [Member]
USD ($)
Dec. 31, 2013
Series C Preferred Stock [Member]
CNY
Dec. 31, 2012
Series C Preferred Stock [Member]
CNY
Dec. 31, 2014
Series C Preferred Stock [Member]
USD ($)
Temporary Equity [Line Items]                                                                            
Beginning balance     470,664,000us-gaap_TemporaryEquityCarryingAmountAttributableToParent             3,270,000us-gaap_TemporaryEquityCarryingAmountAttributableToParent
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember		 6,540,000us-gaap_TemporaryEquityCarryingAmountAttributableToParent
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember		           51,452,000us-gaap_TemporaryEquityCarryingAmountAttributableToParent
/ us-gaap_StatementClassOfStockAxis
= dsky_SeriesA1PreferredStockMember		              159,757,000us-gaap_TemporaryEquityCarryingAmountAttributableToParent
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember		 54,238,000us-gaap_TemporaryEquityCarryingAmountAttributableToParent
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember		           71,962,000us-gaap_TemporaryEquityCarryingAmountAttributableToParent
/ us-gaap_StatementClassOfStockAxis
= dsky_SeriesB1PreferredStockMember		              184,223,000us-gaap_TemporaryEquityCarryingAmountAttributableToParent
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember		           
Issuance               950,254us-gaap_TemporaryEquityStockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember		 6,000,000us-gaap_TemporaryEquityStockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember		       6,000,000us-gaap_TemporaryEquityStockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember		   8,312,593us-gaap_TemporaryEquityStockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementClassOfStockAxis
= dsky_SeriesA1PreferredStockMember		 51,215,548us-gaap_TemporaryEquityStockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementClassOfStockAxis
= dsky_SeriesA1PreferredStockMember		    51,452,000us-gaap_TemporaryEquityStockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementClassOfStockAxis
= dsky_SeriesA1PreferredStockMember		      6,000,000us-gaap_TemporaryEquityStockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember		 37,672,200us-gaap_TemporaryEquityStockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember		       37,681,000us-gaap_TemporaryEquityStockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember		   4,000,000us-gaap_TemporaryEquityStockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementClassOfStockAxis
= dsky_SeriesB1PreferredStockMember		 24,648,000us-gaap_TemporaryEquityStockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementClassOfStockAxis
= dsky_SeriesB1PreferredStockMember		    24,648,000us-gaap_TemporaryEquityStockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementClassOfStockAxis
= dsky_SeriesB1PreferredStockMember		      13,413,050us-gaap_TemporaryEquityStockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember		 82,640,484us-gaap_TemporaryEquityStockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember		      82,898,000us-gaap_TemporaryEquityStockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember		     
Less: issuance costs   (3,890,000)us-gaap_PaymentsOfStockIssuanceCosts (24,133,000)us-gaap_PaymentsOfStockIssuanceCosts                                             (2,008,000)us-gaap_PaymentsOfStockIssuanceCosts
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember		                      [1]   (6,961,000)us-gaap_PaymentsOfStockIssuanceCosts
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember		 [1]    [1]  
Less: warrants to Series B Preferred Shares Investors                                                 (4,243,000)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember		                            
Transfer from preferred share warrant liability                                                          5,232,000dsky_TemporaryEquityAllocationToWarrants
/ us-gaap_StatementClassOfStockAxis
= dsky_SeriesB1PreferredStockMember		                   
Accretion to redemption value                                           414,272,000us-gaap_TemporaryEquityAccretionToRedemptionValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember		 108,776,000us-gaap_TemporaryEquityAccretionToRedemptionValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember		 22,870,000us-gaap_TemporaryEquityAccretionToRedemptionValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember		       183,155,000us-gaap_TemporaryEquityAccretionToRedemptionValue
/ us-gaap_StatementClassOfStockAxis
= dsky_SeriesB1PreferredStockMember		 43,042,000us-gaap_TemporaryEquityAccretionToRedemptionValue
/ us-gaap_StatementClassOfStockAxis
= dsky_SeriesB1PreferredStockMember		          457,463,000us-gaap_TemporaryEquityAccretionToRedemptionValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember		   110,964,000us-gaap_TemporaryEquityAccretionToRedemptionValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember		     
Deemed dividend 540,000us-gaap_DividendsPreferredStock     14,402,000us-gaap_DividendsPreferredStock 540,000us-gaap_DividendsPreferredStock 2,337,532us-gaap_DividendsPreferredStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember		 14,402,000us-gaap_DividendsPreferredStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember		           540,000us-gaap_DividendsPreferredStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember		                                                    
Repurchased by the Company       (4,457,000)us-gaap_StockRepurchasedDuringPeriodValue   (2,845,593)us-gaap_StockRepurchasedDuringPeriodValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember		 (17,532,268)us-gaap_StockRepurchasedDuringPeriodValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember		        (3,270,000)us-gaap_StockRepurchasedDuringPeriodValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember		                                                       
Conversion into ordinary shares     1,536,175,000us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecuritiesNetOfAdjustments             (3,270,000)us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecuritiesNetOfAdjustments
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember		 [2]    [2]    [2]       (51,452,000)us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecuritiesNetOfAdjustments
/ us-gaap_StatementClassOfStockAxis
= dsky_SeriesA1PreferredStockMember		 [2]    [2]    [2]       (578,156,000)us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecuritiesNetOfAdjustments
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember		 [2]    [2]    [2]       (256,958,000)us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecuritiesNetOfAdjustments
/ us-gaap_StatementClassOfStockAxis
= dsky_SeriesB1PreferredStockMember		 [2]    [2]    [2]       (646,340,000)us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecuritiesNetOfAdjustments
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember		          
Exchange difference                                           4,127,000us-gaap_TemporaryEquityOtherChanges
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember		 (3,257,000)us-gaap_TemporaryEquityOtherChanges
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember		 (62,000)us-gaap_TemporaryEquityOtherChanges
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember		       1,841,000us-gaap_TemporaryEquityOtherChanges
/ us-gaap_StatementClassOfStockAxis
= dsky_SeriesB1PreferredStockMember		 (960,000)us-gaap_TemporaryEquityOtherChanges
/ us-gaap_StatementClassOfStockAxis
= dsky_SeriesB1PreferredStockMember		          4,654,000us-gaap_TemporaryEquityOtherChanges
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember		   (2,678,000)us-gaap_TemporaryEquityOtherChanges
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember		     
Ending balance         470,664,000us-gaap_TemporaryEquityCarryingAmountAttributableToParent              3,270,000us-gaap_TemporaryEquityCarryingAmountAttributableToParent
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember		 6,540,000us-gaap_TemporaryEquityCarryingAmountAttributableToParent
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember		           51,452,000us-gaap_TemporaryEquityCarryingAmountAttributableToParent
/ us-gaap_StatementClassOfStockAxis
= dsky_SeriesA1PreferredStockMember		              159,757,000us-gaap_TemporaryEquityCarryingAmountAttributableToParent
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember		 54,238,000us-gaap_TemporaryEquityCarryingAmountAttributableToParent
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember		           71,962,000us-gaap_TemporaryEquityCarryingAmountAttributableToParent
/ us-gaap_StatementClassOfStockAxis
= dsky_SeriesB1PreferredStockMember		                184,223,000us-gaap_TemporaryEquityCarryingAmountAttributableToParent
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember		      
[1] The Company issued the Series A-1 and Series C Preferred Shares on the same date, and all the proceeds from issuance of Series A-1 Preferred Shares were used by the Company to repurchase 50% of the Series A Preferred Shares, all Li Meiping Ordinary shares, and certain ordinary shares held by Mr. Chen at the same issuance price of Series A-1 Preferred Shares, therefore, the Company considered that it is more appropriate to allocate all the issuance cost to Series C Preferred Shares as the issuance of Series A-1 Preferred Shares and repurchase of Series A Preferred Shares, Li Meiping Ordinary shares and certain ordinary shares were in substance a shareholders' transaction.
[2] In August 2014, the Company completed its IPO. Accordingly, all outstanding preferred shares were converted into class A and class B ordinary shares. The carrying amount of preferred shares immediately prior to conversion was transferred to share capital and additional paid in capital.