Condensed Consolidated Statements of Cash Flows Supplemental Information - Significant Non-cash Investing Activities - (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Net increase (decrease) in accruals related to:
Investment in equipment supporting joint revenue sharing arrangements	$ 409	$ 117
Acquisition of other intangible assets	43	(848)
Net accruals	$ 452	$ (731)