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Long-Term Debt Obligations - Solar Revolving Credit Facility - Additional Information (Detail) - Solar Revolving Credit Facility [Member]	1 Months Ended	6 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)
Debt Instrument [Line Items]
Senior asset-based revolving credit agreement, total lender commitments	$ 50,000,000.0	$ 50,000,000.0
Revolving credit facility, interest rate	2.50%	2.50%
LIBOR Loans [Member]
Debt Instrument [Line Items]
Debt instrument interest rate description		(i) for LIBOR loans, at our option, three-month LIBOR or daily LIBOR
Base Rate Loans [Member]
Debt Instrument [Line Items]
Debt instrument interest rate description		(ii) for Base Rate loans, the highest of (a) the Federal Funds Rate plus 0.50%, (b) the Prime Rate, and (c) the three-month LIBOR plus 1.00%.
Base Rate Loans [Member] | Federal Funds Rate [Member]
Debt Instrument [Line Items]
Debt instrument basis spread on variable rate	0.50%
Base Rate Loans [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Debt instrument basis spread on variable rate	1.00%

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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

The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

+ References

No definition available.

+ Details

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- Definition

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

+ References

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

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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.

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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://fasb.org/us-gaap/role/ref/legacyRef
-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

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