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Stockholders' Equity - Capital Stock (Details)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
item
shares
Dec. 31, 2019
USD ($)
shares
Nov. 18, 2020
USD ($)
$ / shares
Capital Stock      
Stock Repurchased During Period, Value | $ $ 350 $ 662  
Common Class B      
Capital Stock      
Common stock, shares issued 19,720,381 19,720,381  
Common stock, shares outstanding 19,720,381    
Number of votes per share of common stock | item 10    
Common Class A      
Capital Stock      
Common stock, shares issued excluding treasury shares 20,246,610    
Common stock, shares issued 25,457,709 25,202,314  
Common stock, shares outstanding 20,246,610    
Stock repurchase price (in dollars per share) | $ / shares     $ 0.0001
Number of votes per share of common stock | item 1    
Common Class A | Treasury Stock      
Capital Stock      
Number of shares repurchased 33,082    
Stock Repurchased During Period, Value | $ $ 350 $ 662  
Common Class A | Maximum      
Capital Stock      
Authorized repurchase amount | $     $ 20,000