Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Summary Of Significant Accounting Policies [Line Items]
Aggregate amount of transaction price allocated to remaining performance obligations	$ 900,000		$ 900,000
Remaining performance obligations expected to be recognized, year	2028		2028
Deferred revenue recognized	$ 9,900	$ 6,100	$ 41,900	$ 33,400
Restricted cash	1,400		1,400		$ 1,700
Proceeds from sale/maturity of short-term investments			80,092	37,743
Short-term investments	$ 29,175		29,175		$ 51,598
Purchases of short-term investments			$ 57,734	$ 49,100
Minimum
Summary Of Significant Accounting Policies [Line Items]
Future revenue including variable consideration, contractual terms ending, year			2021
Holding period of settlement and merchant reserve assets and liabilities			1 day
Maximum
Summary Of Significant Accounting Policies [Line Items]
Future revenue including variable consideration, contractual terms ending, year			2028
Holding period of settlement and merchant reserve assets and liabilities			4 days
Short-term investment contractual maturities			2 years		2 years