Summary of Significant Accounting Policies (Revenue Recognition) (Details) $ in Millions	6 Months Ended
	Jun. 30, 2021 USD ($) revenueSource	Dec. 31, 2020 USD ($)
Disaggregation of Revenue [Line Items]
Revenue sources	2
Percentage of median observable prices	15.00%
Contract asset | $	$ 3.8	$ 2.7
Product
Disaggregation of Revenue [Line Items]
Revenue streams	2
Payment terms	Payment terms are generally thirty to ninety days from the date of invoicing.
Service
Disaggregation of Revenue [Line Items]
Payment terms	Payment terms are generally thirty to ninety days from the date of invoicing.
Joint Development Agreements
Disaggregation of Revenue [Line Items]
Payment terms	Payment terms are generally thirty to ninety days from the achievement of each milestone.