Discontinued Operations - Additional Information (Details)		3 Months Ended		9 Months Ended
	Sep. 01, 2016 USD ($) option	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenues		$ 23,002,000	$ 23,099,000	$ 66,351,000	$ 75,456,000
Cost of revenues		8,088,000	8,587,000	23,597,000	28,417,000
Globus facility agreement
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Maximum borrowing capacity	$ 30,000,000
Globus facility agreement | Line of credit
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Line of credit, expiration period	5 years
Supply agreement [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenues			2,300,000		9,200,000
Cost of revenues			$ 2,000,000		$ 7,900,000
Contracts revenue		2,000,000		5,700,000
Cost of contract revenues		$ 1,800,000		$ 5,300,000
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