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Condensed Consolidated Statements of Changes in Stockholders’ Equity - USD ($)
$ in Thousands
Total
Conversion of Class B voting common stock to Class A voting common stock
Class A voting common stock
Class B voting common stock
Common stock
Class A voting common stock
Common stock
Class A voting common stock
Conversion of Class B voting common stock to Class A voting common stock
Common stock
Class B voting common stock
Common stock
Class B voting common stock
Conversion of Class B voting common stock to Class A voting common stock
Additional paid-in capital
Accumulated other comprehensive (loss) income
Accumulated deficit
Beginning balance (in shares) at Dec. 31, 2019         18,584,478   4,927,401        
Beginning balance at Dec. 31, 2019 $ 270,090       $ 19   $ 5   $ 275,553 $ 41 $ (5,528)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Issuance of debt conversion option 104,553               104,553    
Debt conversion option issuance costs, net of tax (3,731)               (3,731)    
Capped call option purchase price (43,320)               (43,320)    
Exercises of vested stock options (in shares)         32,059            
Exercises of vested stock options 244               244    
Vesting of restricted stock units (in shares)         103,824            
Equity awards withheld for tax liability (in shares)         (14,411)            
Equity awards withheld for tax liability (1,021)               (1,021)    
Conversion of Class B voting common stock to Class A voting common stock (in shares)           500,250   (500,250)      
Conversion of Class B voting common stock to Class A voting common stock   $ (1)           $ (1)      
Foreign currency translation (96)                 (96)  
Stock based compensation 2,499               2,499    
Net loss (1,058)                   (1,058)
Ending balance (in shares) at Mar. 31, 2020         19,206,200   4,427,151        
Ending balance at Mar. 31, 2020 328,159       $ 19   $ 4   334,777 (55) (6,586)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Debt conversion option issuance costs, net of tax (11)               (11)    
Exercises of vested stock options (in shares)         502,182            
Exercises of vested stock options 3,297       $ 1       3,296    
Vesting of restricted stock units (in shares)         21,871            
Equity awards withheld for tax liability (in shares)         (2,133)            
Equity awards withheld for tax liability (272)               (272)    
Conversion of Class B voting common stock to Class A voting common stock (in shares)           827,597   (827,597)      
Foreign currency translation (23)                 (23)  
Stock based compensation 2,425               2,425    
Net loss (20,641)                   (20,641)
Ending balance (in shares) at Jun. 30, 2020         20,555,717   3,599,554        
Ending balance at Jun. 30, 2020 312,934       $ 20   $ 4   340,215 (78) (27,227)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Exercises of vested stock options (in shares)         44,848            
Exercises of vested stock options 386               386    
Vesting of restricted stock units (in shares)         17,948            
Equity awards withheld for tax liability (in shares)         (2,002)            
Equity awards withheld for tax liability (350)               (350)    
Conversion of Class B voting common stock to Class A voting common stock (in shares)           606,418   (606,418)      
Conversion of Class B voting common stock to Class A voting common stock   0       $ 1   $ (1)      
Foreign currency translation 139                 139  
Stock based compensation 2,382               2,382    
Net loss (2,352)                   (2,352)
Ending balance (in shares) at Sep. 30, 2020         21,222,929   2,993,136        
Ending balance at Sep. 30, 2020 313,139       $ 21   $ 3   342,633 61 (29,579)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Exercises of vested stock options (in shares)         13,995            
Exercises of vested stock options 149               149    
Vesting of restricted stock units (in shares)         17,424            
Equity awards withheld for tax liability (in shares)         (1,749)            
Equity awards withheld for tax liability (273)               (273)    
Conversion of Class B voting common stock to Class A voting common stock (in shares)           497,011   (497,011)      
Conversion of Class B voting common stock to Class A voting common stock   (1)           $ (1)      
Equity consideration for Voxbone acquisition (in shares)         663,394            
Equity consideration for Voxbone acquisition 106,380       $ 1       106,379    
Foreign currency translation 27,880                 27,880  
Stock based compensation 2,575               2,575    
Net loss (19,926)                   (19,926)
Ending balance (in shares) at Dec. 31, 2020     22,413,004 2,496,125 22,413,004   2,496,125        
Ending balance at Dec. 31, 2020 429,923       $ 22   $ 2   451,463 27,941 (49,505)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Issuance of debt conversion option 66,908               66,908    
Debt conversion option issuance costs, net of tax (2,049)               (2,049)    
Capped call option purchase price (25,500)               (25,500)    
Exercises of vested stock options (in shares)         57,817            
Exercises of vested stock options 753               753    
Vesting of restricted stock units (in shares)         141,707            
Equity awards withheld for tax liability (in shares)         (19,879)            
Equity awards withheld for tax liability (3,187)               (3,187)    
Conversion of Class B voting common stock to Class A voting common stock (in shares)           280,955   (280,955)      
Conversion of Class B voting common stock to Class A voting common stock   $ 1       $ 1          
Foreign currency translation (23,185)                 (23,185)  
Stock based compensation 4,390               4,390    
Net loss (5,316)                   (5,316)
Ending balance (in shares) at Mar. 31, 2021     22,873,604 2,215,170 22,873,604   2,215,170        
Ending balance at Mar. 31, 2021 $ 442,738       $ 23   $ 2   $ 492,778 $ 4,756 $ (54,821)