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Summary of Significant Accounting Policies (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Summary Of Significant Accounting Policies [Line Items]      
Aggregate amount of transaction price allocated to remaining performance obligations $ 1,000,000    
Remaining performance obligations expected to be recognized, year 2028    
Deferred revenue recognized $ 17,700    
Restricted cash 2,600   $ 2,700
Proceeds from sale/maturity of short-term investments 18,670 $ 19,619  
Short-term investments 23,529   $ 26,109
Equity method investment, carrying value $ 6,600    
Payment Technology and Services Company      
Summary Of Significant Accounting Policies [Line Items]      
Equity method investment, noncontrolling interest 8.00%    
Minimum      
Summary Of Significant Accounting Policies [Line Items]      
Future revenue including variable consideration, contractual terms ending, year 2020    
Maximum      
Summary Of Significant Accounting Policies [Line Items]      
Future revenue including variable consideration, contractual terms ending, year 2028    
Short-term investment contractual maturities 2 years   2 years