Discontinued Operations - Additional Information (Details)		3 Months Ended		6 Months Ended
	Sep. 01, 2016 USD ($) option	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenues		$ 22,042,000	$ 24,379,000	$ 43,349,000	$ 52,357,000
Cost of revenues		7,772,000	8,631,000	15,509,000	19,830,000
General and administrative expenses pertaining to discontinued operations		100,000	100,000	100,000	100,000
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			2,400,000		6,900,000
Cost of revenues			$ 2,100,000		$ 5,900,000
Contracts revenue		1,600,000		3,700,000
Cost of contract revenues		$ 1,500,000		$ 3,500,000
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