Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity (Details)

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Stockholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 20, 2018
Dec. 31, 2021
Feb. 25, 2016
Stockholders' equity      
Shares authorized for repurchase (in shares)     2,000,000
Repurchase of common stock   $ (4,001)  
Remaining shares authorized for repurchase (maximum) (in shares)   1,900,902  
Treasury Stock      
Stockholders' equity      
Share repurchases (in shares)   (55,488)  
Repurchase of common stock   $ (4,001)  
Common Stock | Private Placement | Warrant      
Stockholders' equity      
Number of shares issued in transaction (in shares) 470,000    
Sale of stock (in dollars per share) $ 65.16    
Warrants exercisable period (in years) 4 years