Long-term Debt - Summary of Long-term Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Total debt	$ 94,303	$ 121,293
Current portion of long-term debt	(6,954)	(995)
Long-term debt	87,349	120,298
Credit Facility
Debt Instrument [Line Items]
Principal outstanding	15,000	5,000
Unamortized debt issuance costs	(157)	(599)
Carrying amount	14,843	4,401
Senior Loan Facility
Debt Instrument [Line Items]
Principal outstanding	29,000	29,995
Current portion of long-term debt	(6,954)	(995)
6% Convertible Notes Due 2023
Debt Instrument [Line Items]
Principal outstanding	60,000
Unamortized debt issuance costs	(300)
Unamortized debt discount and debt issuance costs	(16,494)
Carrying amount	43,506
10% senior secured notes due 2019
Debt Instrument [Line Items]
Principal outstanding		1,872
Unamortized debt issuance costs		(25)
Carrying amount		1,847
10% second lien notes due 2019
Debt Instrument [Line Items]
Principal outstanding	6,961	85,239
Unamortized debt issuance costs	(7)	(189)
Carrying amount	$ 6,954	$ 85,050

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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