Revenues - Changes in Balances of Deferred Costs to Obtain and Fulfill Contracts (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($)
Deferred Costs to Obtain Contracts [Member]
Capitalized Contract Cost [Line Items]
Balance at beginning of period	$ 283
Costs deferred	198
Amortization	(274)
Balance at end of period	207
Deferred Costs to Fulfill Contracts [Member]
Capitalized Contract Cost [Line Items]
Balance at beginning of period	197
Costs deferred	115
Amortization	(158)
Balance at end of period	$ 154