Discontinued Operations - Additional Information (Details) $ in Thousands		3 Months Ended	12 Months Ended
	Sep. 01, 2016 option	Mar. 31, 2019	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Contracts revenue			$ 113,427	$ 91,694
Cost of revenues			35,833	28,457
Supply agreement
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Contracts revenue			5,200	8,000
Cost of revenues			$ 4,800	$ 7,500
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		2020-08