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Income taxes (Tables)
12 Months Ended
Dec. 31, 2020
Income taxes  
Schedule of income tax (expense) benefit by jurisdiction

    

2020

    

2019

    

2018

U.S. federal:

Current

$

(5)

$

(20)

$

(18)

Deferred

 

114

 

115

 

4,569

Total U.S. federal

$

109

$

95

$

4,551

U.S. state and local:

Current

$

(142)

$

(32)

$

(285)

Deferred

 

(123)

 

(35)

 

1,048

Total U.S. state and local

$

(265)

$

(67)

$

763

Foreign:

Current

$

(1)

$

$

(161)

Total foreign

$

(1)

$

$

(161)

Schedule of reconciliation of tax rates

    

2020

    

2019

    

2018

 

Federal statutory rate

 

21.0

%  

21.0

%  

21.0

%  

State and local

 

5.5

11.2

19.7

Foreign rate differential

 

0.9

0.2

(0.5)

Stock options

 

2.7

(52.2)

(47.2)

Excess tax benefits from stock-based compensation

(2.9)

95.5

106.4

Non-controlling interests

 

(0.3)

0.2

5.5

Valuation allowance

 

(26.7)

(74.7)

(90.7)

Uncertain tax positions

 

2.3

Convertible Notes

94.9

Other

 

(1.1)

(0.9)

(5.9)

Income taxes

 

(0.9)

%  

0.3

%  

105.5

%  

Schedule of deferred tax assets and liabilities

    

2020

    

2019

Deferred tax assets:

Net operating loss carryforwards

$

46,998

$

44,565

Outside basis differences for U.S. partnerships

 

7,941

 

8,656

Operating lease liabilities

4,076

4,695

Deferred revenue

 

800

 

782

Deferred compensation

 

86

 

623

State taxes

 

39

 

44

Stock options

 

 

Other

 

2,099

 

939

Valuation allowance

 

(46,459)

 

(41,646)

Net deferred tax assets

 

15,580

 

18,658

Deferred tax liabilities:

Property and equipment

 

(5,729)

 

(6,943)

Convertible Notes

 

(3,403)

 

(4,366)

Operating lease right-of-use assets

(2,888)

(3,348)

Intangible assets

 

(3,106)

 

(3,079)

Stock options

(1,438)

(1,915)

Net deferred tax liabilities

 

(16,564)

 

(19,651)

Net deferred taxes

$

(984)

$

(993)

Schedule of changes in the valuation allowance

    

Valuation

Allowance

Balance, December 31, 2017

$

34,990

Decrease credited to operations

 

(1,180)

Balance, December 31, 2018

 

33,810

Additions charged to operations

 

7,843

Decrease credited to operations

 

(7)

Balance, December 31, 2019

 

41,646

Additions charged to operations

 

4,816

Decrease credited to operations

 

(3)

Balance, December 31, 2020

$

46,459