v3.3.1.900
Income taxes (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2015
Dec. 31, 2014
U.S. federal:          
Current $ 27 $ 6 $ (402)    
Deferred 319 328 1,158    
Total U.S. federal 346 334 756    
U.S. state and local:          
Current 134 226 248    
Deferred 1 140 457    
Total U.S. state and local $ 135 $ 366 $ 705    
Reconciliation from U.S. federal statutory tax rate to effective income taxes rate          
Federal statutory rate (as a percent) 34.00% 34.00% 34.00%    
State and local (as a percent) 4.10% 4.60% (5.70%)    
Foreign rate differential (as a percent) (0.50%) (0.70%) (3.20%)    
Stock options (as a percent) (1.50%) (0.50%) (0.70%)    
Non-controlling interests (as a percent) 0.50% 1.90% 15.20%    
Valuation allowance (as a percent) (39.00%) (45.10%) (128.50%)    
Transaction costs (as a percent) 0.00% 0.00% (6.70%)    
Purchase price adjustments (as a percent) 0.00% 0.00% 6.60%    
Revaluation of deferred tax assets (as a percent) 0.00% 0.00% 2.80%    
Uncertain tax positions (as a percent) (0.10%) (0.10%) (2.90%)    
Return to provision (as a percent) 0.00% 0.60% 9.30%    
Other (as a percent) 0.30% 1.40% 1.10%    
Effective Income Tax Rate Reconciliation, Percent, Total (2.20%) (3.90%) (78.70%)    
Deferred tax assets:          
Net operating loss carryforwards       $ 16,895 $ 10,115
Outside basis differences for U.S. partnerships       6,190 3,710
Stock options       3,882 3,348
Deferred revenue       376 648
Deferred compensation       301 144
State taxes       67 45
Other       1,312 1,341
Valuation allowance $ (12,470) $ (4,101) $ (1,669) (19,548) (12,470)
Net Deferred Tax Assets       9,475 6,881
Deferred tax liabilities:          
Intangible assets       (6,268) (6,855)
Property and equipment       (6,172) (2,671)
Net deferred tax liabilities       (12,440) (9,526)
Net deferred taxes       (2,965) (2,645)
Net operating loss carryforwards          
The tax effected amount of gross unrealized net operating loss carryforwards       6,933  
Foreign loss before income taxes $ 1,381 1,251 559    
Period of cumulative results for determination of releasing valuation allowance 3 years        
Changes in the valuation allowance          
Balance at the beginning of the period $ 12,470 4,101 1,669    
Additions charged to operations 7,078 8,369 2,432    
Decrease credited to operations 0 0 0    
Balance at the end of the period $ 19,548 $ 12,470 4,101    
Windfall Tax Benefits from Stock Option Exercises     $ 55    
United Kingdom          
Net operating loss carryforwards          
Foreign subsidiary deferred tax asset       1,528  
Brazil          
Net operating loss carryforwards          
Foreign subsidiary deferred tax asset       476  
Federal          
Net operating loss carryforwards          
The tax effected amount of gross unrealized net operating loss carryforwards       55,278 35,555
State          
Net operating loss carryforwards          
The tax effected amount of gross unrealized net operating loss carryforwards       68,614 55,457
Foreign          
Net operating loss carryforwards          
The tax effected amount of gross unrealized net operating loss carryforwards       $ 9,042 $ 7,661