Debt Instrument Additional Basis Spread

No definition available.

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- Definition

Fixed Charge Coverage Ratio

+ References

No definition available.

+ Details

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(2))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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- Definition

Description of the maturity date of the debt instrument including whether the debt matures serially and, if so, a brief description of the serial maturities.

+ References

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- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

The effective interest rate during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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- Definition

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.

+ References

No definition available.

+ Details

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Period Type:	instant

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

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- Definition

The carrying value as of the balance sheet date of the current portion 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(13))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(19))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Details

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Credit Facility - Additional Information (Detail) - USD ($)	1 Months Ended		3 Months Ended	12 Months Ended
	Mar. 31, 2014	Jul. 31, 2013	Mar. 31, 2018	Dec. 31, 2017
GECC
Line of Credit Facility [Line Items]
Line of credit facility maximum borrowing capacity	$ 75,000,000
Line of credit facility, maturity date			Jun. 15, 2018	Mar. 27, 2019
Amount of credit facility outstanding				$ 5,000,000
Stand by letters of credit outstanding amount			$ 13,700,000	$ 20,000,000
Line of credit facility, maturity date description			The amounts outstanding under the credit facility, as amended, are payable in full upon maturity of the facility on March 27, 2019, except that the credit facility will mature on June 15, 2018 if we do not refinance or extend the maturity of the Convertible Senior Notes that mature in 2018, provided that any such refinancing or extension shall have a maturity date that is no sooner than six months after the stated maturity of the facility (i.e., on or about September 27, 2019).
Rate of credit facility			3.79%	3.79%
GECC \| London Interbank Offered Rate (LIBOR)
Line of Credit Facility [Line Items]
Applicable margin spread over base rate	2.25%
Additional basis spread			1.00%
GECC \| Base Rate
Line of Credit Facility [Line Items]
Applicable margin spread over base rate	1.25%
GECC \| Federal Funds Rate
Line of Credit Facility [Line Items]
Applicable margin spread over base rate			0.50%
GECC \| Minimum
Line of Credit Facility [Line Items]
Percentage of unused credit line fee			0.25%
GECC \| Maximum
Line of Credit Facility [Line Items]
Percentage of unused credit line fee			0.50%
WF Loan Agreement \| Minimum
Line of Credit Facility [Line Items]
Line of credit facility, total excess availability			$ 10,000,000
Fixed charge coverage ratio			125.00%
4.25% Convertible Senior Notes (due 2018)
Line of Credit Facility [Line Items]
Line of credit facility, maturity date		Aug. 01, 2018	Jun. 15, 2018
4.25% Convertible Senior Notes (due 2018) \| GECC
Line of Credit Facility [Line Items]
Line of credit facility, maturity date			Aug. 01, 2018
Line of credit facility, total excess availability			$ 10,000,000	$ 14,100,000