Acquisitions - Component of Identifiable Intangible Assets (Details) - USD ($) $ in Thousands	Nov. 19, 2019	Oct. 26, 2018	Aug. 27, 2018	Jun. 01, 2018	Sep. 30, 2020
Acquired Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets					$ 28,688
Ubimo
Acquired Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets	$ 10,750
Elevaate
Acquired Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets		$ 3,781
SavingStar
Acquired Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets			$ 2,577
Ahalogy
Acquired Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets				$ 11,580
Developed technologies | Ubimo
Acquired Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets	$ 7,100
Estimated Useful Life (in Years)	4 years
Developed technologies | Elevaate
Acquired Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets		$ 3,307
Estimated Useful Life (in Years)		5 years
Developed technologies | SavingStar
Acquired Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets			$ 1,476
Estimated Useful Life (in Years)			3 years
Developed technologies | Ahalogy
Acquired Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets				$ 3,100
Estimated Useful Life (in Years)				4 years
Customer relationships | Ubimo
Acquired Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets	$ 3,400
Estimated Useful Life (in Years)	2 years
Customer relationships | Elevaate
Acquired Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets		$ 379
Estimated Useful Life (in Years)		5 years
Customer relationships | SavingStar
Acquired Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets			$ 1,040
Estimated Useful Life (in Years)			3 years
Customer relationships | Ahalogy
Acquired Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets				$ 6,210
Estimated Useful Life (in Years)				6 years
Trade names | Ubimo
Acquired Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets	$ 250
Estimated Useful Life (in Years)	4 years
Trade names | Elevaate
Acquired Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets		$ 95
Estimated Useful Life (in Years)		3 years
Trade names | SavingStar
Acquired Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets			$ 61
Estimated Useful Life (in Years)			1 year 6 months
Trade names | Ahalogy
Acquired Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets				$ 650
Estimated Useful Life (in Years)				4 years
Vendor relationships | Ahalogy
Acquired Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets				$ 1,620
Estimated Useful Life (in Years)				2 years