Discontinued Operations - Additional Information (Details) $ in Thousands		3 Months Ended		6 Months Ended
	Sep. 01, 2016 option	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Contracts revenue		$ 62,249	$ 29,629	$ 106,370	$ 59,744
Cost of revenues		21,184	8,787	33,447	17,871
Supply agreement
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Contracts revenue		400	800	800	1,800
Cost of revenues		$ 400	$ 800	$ 900	$ 1,800
Discontinued operations, disposed of by sale | International Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Supply commitment term	3 years
Supply agreement, number of annual options to extend | option	2
Supply agreement, extended term			12 months
Supply agreement, extended period			2021-08