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Revenue Recognition (Tables)
 12 Months Ended
Dec. 31, 2020
Revenue Recognition [Abstract]  
Schedule of estimated revenue expected to be recognized in future periods related to performance obligations
   2021   2022   2023
and
thereafter		 
Software license and related revenues and consulting services  $7,459   $2,189   $3,045 

 
Schedule of trade receivables, contract assets (unbilled receivables) and contract liabilities (deferred revenues) from contracts with customers
   December 31, 
   2020   2019 
         
Trade receivables (net of allowance)  $111,059   $96,694 
Deferred revenues  $8,793   $8,724