Long-term Debt And Finance Leases - Summary of Long-term Debt and Finance Leases (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Finance leases	$ 806	$ 1,234
Total debt	102,146	91,042
Current portion of long-term debt and finance leases	(7,759)	(7,837)
Total long-term debt and finance leases	94,387	83,205
Credit Facility
Debt Instrument [Line Items]
Principal outstanding	22,000	12,334
Unamortized debt discount and debt issuance costs	(101)	(125)
Carrying amount	21,899	12,209
Senior Loan Facility
Debt Instrument [Line Items]
Principal outstanding	29,000	29,000
Unamortized debt discount and debt issuance costs	(1,845)	(2,448)
Carrying amount	27,155	26,552
6% Convertible Notes Due 2023
Debt Instrument [Line Items]
Principal outstanding	60,000	60,000
Unamortized debt discount and debt issuance costs	(14,667)	(15,906)
Carrying amount	45,333	44,094
10% senior notes due 2019
Debt Instrument [Line Items]
Principal outstanding	6,953	6,957
Unamortized debt discount and debt issuance costs		(4)
Carrying amount	$ 6,953	$ 6,953

Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

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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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Present value of lessee's discounted obligation for lease payments from finance lease.

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