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Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Aggregate amount of transaction price allocated to remaining performance obligations | $ 1,000,000 | $ 1,000,000 |  |
Remaining performance obligations expected to be recognized, year | 2028 | 2028 |  |
Deferred revenue recognized | $ 9,700 | $ 27,400 |  |
Restricted cash | 2,100 | 2,100 |  | $ 2,700
Proceeds from sale/maturity of short-term investments |  | 34,185 | $ 28,753 |
Short-term investments | 27,183 | 27,183 |  | $ 26,109
Equity method investment, carrying value | $ 6,500 | $ 6,500 |  |
Payment Technology and Services Company |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Equity method investment, noncontrolling interest | 8.00% | 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] |  |  |  |
Short-term investment contractual maturities |  | 2 years |  | 2 years

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