Amount of additional borrowings under a long-term financing arrangements that is available to the entity.

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Represents the exit fee, as a percentage of the principal amount, for the final payment of the debt instrument.

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Amount of increased borrowing capacity under a long-term financing arrangement that is available to the entity.

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Represents the percentage of securities in foreign subsidiaries unconditionally guaranteed to secure the debt instrument.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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- Definition

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

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Amount of the fee that accompanies borrowing money under the debt instrument.

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

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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.

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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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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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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 of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the remainder of the fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Long-Term Debt (Details) - NY Green Bank - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Jul. 21, 2017	Dec. 23, 2016
Debt Instrument [Line Items]
Loan Amount				$ 45.0	$ 25.0
Long-term borrowings					25.0
Debt issuance costs					$ 1.2
Increase in term loan facility				$ 20.0
Prepayment fee (as a percent)	7.50%	7.50%
Percent of securities in foreign subsidiaries guaranteed to secure debt	65.00%
Maximum
Debt Instrument [Line Items]
End of term charge	$ 1.8
Secured term loan facility
Debt Instrument [Line Items]
Debt issuance costs		$ 0.5
Long-term Line of Credit	$ 21.2	32.8
Additional amount borrowed		$ 20.0
Effective interest rate (as a percent)	11.80%		10.80%
Term of loan agreement	3 years
2018 (Remainder of fiscal year)	$ 4.0
2019	$ 17.2
Secured term loan facility \| LIBOR
Debt Instrument [Line Items]
Interest rate spread (as a percent)	9.50%