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Share-based compensation - Additional Information (Detail) - USD ($)
$ in Thousands
 1 Months Ended 12 Months Ended
Dec. 01, 2014
Sep. 05, 2014
Jun. 11, 2014
Nov. 30, 2014
Apr. 30, 2014
Nov. 30, 2013
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2018
Dec. 31, 2015
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Restricted shares expected to vest             170,545 1,440,923   1,008,645  
Incremental share-based compensation to be recognized $ 2,214,000                    
Share options cancelled 3,776,711                    
Common shares issued       10,000,000              
Total fair value, share options vested             $ 6,963,000 $ 6,831,000      
Unrecognized share-based compensation costs             $ 167,000 $ 1,358,000      
Weighted-average vesting period expected to be recognized             4 years 7 months 20 days 3 years 2 months 12 days      
Leading Advice Holdings Limited [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Common shares issued         14,195,412 9,073,732          
Restricted shares [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Restricted stock granted 1,505,787                    
Kingsoft Cloud Storage Business [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Replacement award attributable to pre-combination service   $ 303,000                  
Business acquisition date             Sep. 05, 2014        
Replacement award attributable to post-combination service   $ 44,000                  
2010 share incentive plan [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Stock option vesting period, description             Stock options granted to employees and officers vest over a four-year schedule as stated below: (1) One-fourth of the options shall be vested upon the first anniversary of the grant date; (2) The remaining three quarters of the options shall be vested on monthly basis over the next thirty-six months. (1/48 of options shall be vested per month subsequently)        
Number of shares available for grant             2,627,465        
Extended maturity date of share options             Jun. 11, 2015        
Lock-up period for shares from IPO closing date             6 months        
Incremental share-based compensation to be recognized     $ 768,000                
2010 share incentive plan [Member] | Directors [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Stock option vesting period             32 months        
2010 share incentive plan [Member] | Employees [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Estimated forfeiture rate             20.00%        
2010 share incentive plan [Member] | Restricted shares [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Restricted stock granted             2,050,000 1,170,000      
2010 share incentive plan [Member] | Minimum [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Stock option vesting period 2 years                    
2010 share incentive plan [Member] | Maximum [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Stock option vesting period 4 years 6 months                    
Number of shares available for grant                     26,822,828
2013 Plan [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Restricted stock granted             8,664,980 8,664,980      
2013 Plan [Member] | Tranche One [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Restricted shares expected to vest             5,098,345        
Stock option vesting period             4 years        
Stock option vesting period, description             one-fourth of the restricted shares shall be vested upon the first, second, third, and fourth anniversary of the grant date, respectively.        
2013 Plan [Member] | Tranche Two [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Restricted shares expected to vest             1,102,430        
Stock option vesting period             5 years        
Stock option vesting period, description             one-fifth of the restricted shares shall be vested upon the first, second, third, fourth and fifth anniversary of the grant date, respectively.        
2013 Plan [Member] | Tranche Three [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Restricted shares expected to vest             854,405        
Stock option vesting period             44 months        
Stock option vesting period, description             one-fourth of the restricted shares shall be vested upon the eighth month, and three-fourth of the restricted shares shall be vested during the remaining thirty six months.        
2013 Plan [Member] | Tranche Four [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Restricted shares expected to vest             689,700        
Stock option vesting period             4 years        
Stock option vesting period, description             one-fourth, and one-fourth of the restricted shares shall be vested upon the second, third and fourth anniversary of the grant date, respectively.        
2013 Plan [Member] | Tranche Five [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Restricted shares expected to vest             640,100        
Stock option vesting period             2 years        
Stock option vesting period, description             half of the restricted shares shall be vested upon the first and second anniversary of the grant date, respectively.        
2013 Plan [Member] | Tranche Six [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Restricted shares expected to vest             160,000        
Stock option vesting period             1 year        
Stock option vesting period, description             one-year schedule in which all of the restricted shares shall be vested upon the first anniversary of the grant date.        
2013 Plan [Member] | Tranche Seven [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Restricted shares expected to vest             120,000        
2013 Plan [Member] | Restricted shares [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Number of shares available for grant             9,073,732        
2013 Plan [Member] | Restricted shares [Member] | Scenario, Forecast [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Number of shares available for grant                 9,073,732    
2014 Plan [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Number of shares available for grant         14,195,412            
Unrecognized compensation expense relating to the restricted shares             $ 7,448,000        
Restricted shares issued to non-employees             60,000        
2014 Plan [Member] | Senior Officers [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Unrecognized compensation expense relating to the restricted shares             $ 1,424,000        
Restricted shares issued to non-employees             60,000        
2014 Plan [Member] | Tranche One [Member] | Certain Officers and Employees [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Restricted shares expected to vest             9,040,500        
Stock option vesting period             5 years        
Stock option vesting period, description             one-fifth of the restricted shares shall be vested upon the first, second, third, fourth and fifth anniversary of the grant date, respectively.        
2014 Plan [Member] | Tranche Two [Member] | Certain Officers and Employees [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Restricted shares expected to vest             5,400,000        
Stock option vesting period             4 years        
Stock option vesting period, description             one-fourth of the restricted shares shall be vested upon the first, second, third and fourth anniversary of the grant date, respectively.        
2014 Plan [Member] | Tranche Three [Member] | Certain Officers and Employees [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Restricted shares expected to vest             9,000        
Stock option vesting period             2 years        
Stock option vesting period, description             half of the restricted shares shall be vested upon the first and second anniversary of the grant date, respectively.        
2014 Plan [Member] | Restricted shares [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Restricted stock granted             0 6,749,000      
2014 Plan [Member] | Restricted shares [Member] | Certain Officers and Employees [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Restricted stock granted             14,536,000        
2014 Plan [Member] | Restricted shares [Member] | Tranche Four [Member] | Certain Officers and Employees [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Restricted shares expected to vest             86,500