Discontinued Operations - Additional Information (Details)		1 Months Ended	12 Months Ended
	Sep. 01, 2016 USD ($) option	Nov. 30, 2016 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Repayments of lines of credit			$ 98,443,000	$ 134,792,000
Preliminary purchase price adjustments		$ 104,000
Revenues			101,739,000	120,248,000
Cost of revenues			39,406,000	44,114,000
Supply agreement [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Contracts revenue			14,400,000	2,600,000
Cost of sales on contract revenues			12,100,000	2,300,000
International
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenues			0	10,300,000
Cost of revenues			0	8,900,000
Deerfield facility agreement and amended credit facility | Line of credit
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Repayments of lines of credit	$ 66,000,000
Globus facility agreement
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Maximum borrowing capacity	$ 30,000,000		30,000,000	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
Discontinued operations, disposed of by sale | International operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Consideration received	$ 80,000,000
Supply commitment term	3 years
Supply agreement, number of annual options to extend | option	2
Supply obligation credit	$ 1,927,000
Supply obligation credit term	6 months
Discontinued operations, disposed of by sale | International operations | Maximum
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Supply obligation credit			$ 2,200,000
Discontinued operations, disposed of by sale | International operations | Deerfield facility agreement and amended credit facility
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Interest expense, debt excluding amortization				$ 7,000,000