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Schedule of Outstanding Debt (Parenthetical) (Detail) (USD $)	9 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Secured Equipment Notes due in September 2019 with Monthly Payments of $329,718 [Member]
Debt Instrument [Line Items]
Monthly principal and interest payments	$ 329,718
Interest is paid monthly at a fixed rate	2.15%
Payment Frequency	Monthly
Secured Equipment Notes due in September 2019 with Monthly Payments of $90,939 [Member]
Debt Instrument [Line Items]
Monthly principal and interest payments	90,939
Interest is paid monthly at a fixed rate	2.15%
Payment Frequency	Monthly
Secured Equipment Notes due in February 2019 [Member]
Debt Instrument [Line Items]
Monthly principal and interest payments	444,000
Lower interest rate paid at a fixed rate	1.87%
Upper interest rate paid at a fixed rate	1.93%
Payment Frequency	Monthly
Secured Equipment Notes due in June 2018 [Member]
Debt Instrument [Line Items]
Monthly principal and interest payments	$ 480,000	$ 480,000
Lower interest rate paid at a fixed rate	1.90%	1.90%
Upper interest rate paid at a fixed rate	2.00%	2.00%
Payment Frequency	Quarterly	Quarterly

X

- Definition

Description of the frequency of periodic payments (monthly, quarterly, annual).

+ 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)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



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-Publisher SEC

-Name Regulation S-X (SX)

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-Article 5



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 470

-Section 50

-Paragraph 3

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Contractual interest rate for funds borrowed, under the debt agreement.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

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- Definition

Maximum contractual interest rate for funds borrowed, under the debt agreement.

+ References

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

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Minimum contractual interest rate for funds borrowed, under the debt agreement.

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



Reference 2: http://www.xbrl.org/2003/role/presentationRef

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Amount of the required periodic payments including both interest and principal payments.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

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-Subparagraph (SX 210.5-02.22)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



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-Number 210

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-Name Accounting Standards Codification

-Topic 942

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