Discontinued Operations - Additional Information (Details) $ in Thousands		3 Months Ended			9 Months Ended
	Sep. 01, 2016 option	Sep. 30, 2020 USD ($)	Jun. 30, 2020	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Contracts revenue		$ 41,163		$ 29,201	$ 100,907	$ 81,075
Cost of revenues		11,926		9,268	29,797	25,688
Supply agreement
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Contracts revenue		1,100		1,200	3,000	4,000
Cost of revenues		$ 1,100		$ 1,100	$ 2,800	$ 3,700
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