Other Assets - Schedule of Notes Receivable Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Financing Receivable, Allowance for Credit Loss [Roll Forward]
(Provision for) / recovery of expected credit losses			$ 11	$ 382
Loan Receivables
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning of period balance	$ (73)	$ (87)	(73)	0
(Provision for) / recovery of expected credit losses	(1)	41	(1)	388
Write-offs	0	0	0	0
End of period balance	(74)	(46)	(74)	(46)
Loan Receivables | Impact of adopting Topic 326
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning of period balance				(434)
Hardware Financing Receivables
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning of period balance	(5)	(29)	(16)	(16)
(Provision for) / recovery of expected credit losses	1	(8)	12	(6)
Write-offs	0	0	0	0
End of period balance	$ (4)	$ (37)	$ (4)	(37)
Hardware Financing Receivables | Impact of adopting Topic 326
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning of period balance				$ (15)