Discontinued Operations - Additional Information (Details) $ in Thousands		3 Months Ended		6 Months Ended
	Sep. 01, 2016 option	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Contracts revenue		$ 29,629	$ 27,319	$ 59,744	$ 51,874
Cost of revenues		8,787	8,433	17,871	16,420
Supply agreement
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Contracts revenue		800	1,200	1,800	2,800
Cost of revenues		$ 800	$ 1,200	$ 1,800	$ 2,600
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