Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Nature of Operations and Summary of Significant Accounting Policies (Details)

v3.20.4
Nature of Operations and Summary of Significant Accounting Policies (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Nature of Operations and Summary of Significant Accounting Policies (Details) [Line Items]      
Number of operating segments 1    
Accounts receivable, net of allowance for credit losses $ 870 $ 939  
Severance pay liabilities 4,100 4,200  
Deposit in insurance policies and pension funds 3,100 3,300  
Severance expenses $ 9,100 4,000 $ 4,100
Annual taxable, percentage 50.00%    
Annual compensation, percentage 4.00%    
401(k) Plan contributions $ 4,100 4,200 3,200
Increase in retained earnings 1,400    
Advertising costs 6,300 16,200 15,900
Lease liability 1,000 27,900  
Right of use asset 21,300 $ 27,400  
operating leases $ 2,000    
Income tax, percentage 25.00%    
Maximum additional tax rate on distribution of dividends 10.00%    
Settlement percentage 50.00%    
Rental expense     $ 8,200
Remaining economic life of the underlying asset 75.00%    
Fair value of the underlying asset 90.00%    
Leases description The Company is a party to several lease agreements for its facilities, the latest of which has been extended until midst 2026. The Company has the option to extend certain agreements for additional periods, the earliest of which is until the end of June 2021 and the latest is until the end of October 2028. During the extended lease period, the aggregate annually rental payments will increase by 2%-4% each year.    
Minimum [Member]      
Nature of Operations and Summary of Significant Accounting Policies (Details) [Line Items]      
Annually rental payments 2.00%    
Maximum [Member]      
Nature of Operations and Summary of Significant Accounting Policies (Details) [Line Items]      
Annually rental payments 4.00%