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No definition available.

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Exercise price per share or per unit of warrants or rights outstanding.

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- Definition

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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The price per share of the conversion feature embedded in the debt instrument.

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Face (par) amount of debt instrument at time of issuance.

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- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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- Definition

Amount, after accumulated amortization, of debt discount.

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

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

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Carrying value as of the balance sheet date of [accrued] interest payable on all forms of debt, including trade payables, that has been incurred and is unpaid. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.

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INDEBTEDNESS (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Sep. 30, 2018	Dec. 31, 2014
Long-term Debt, Gross	$ 143,750	$ 143,750
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate	3.00%
Debt Instrument, Unamortized Discount	$ 13,924	$ 8,643
Long-term Debt [Member]
Debt Instrument, Interest Rate, Effective Percentage		6.80%
Senior Secured Credit Facility [Member] \| Citizens Bank, N.A. [Member]
Debt Instrument, Term	5 years
Debt Issuance Costs, Gross		$ 2,900
Prepaid Expenses and Other Current Assets [Member] \| Revolving Credit Facility [Member]
Debt Issuance Costs, Current, Net		200
Other Long Term Assets [Member] \| Revolving Credit Facility [Member]
Debt Issuance Costs, Gross		1,100
Other Noncurrent Assets [Member] \| Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity	$ 50,000
Debt Issuance Costs, Noncurrent, Net		700
Convertible Senior Notes [Member]
Long-term Debt, Gross			$ 143,800
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate			3.00%
Debt Instrument, Unamortized Discount			$ 33,600
Class of Warrant or Right, Exercise Price of Warrants or Rights			$ 96.21
Debt Instrument, Convertible, Conversion Price			$ 69.48
Convertible Senior Notes [Member] \| Accrued Liabilities [Member]
Interest Payable, Current	400	1,400
Term Loan [Member] \| Citizens Bank, N.A. [Member]
Debt Instrument Periodic Payment To Be Paid In Installments		6,100
Debt Instrument, Face Amount	$ 75,000	73,100
Debt Issuance Costs, Gross		1,800
Current Term Loan [Member] \| Citizens Bank, N.A. [Member]
Debt Instrument, Face Amount		$ 6,100