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Credit Facility - Additional Information (Detail) - USD ($)	Dec. 08, 2016	Jul. 13, 2018	Jun. 30, 2018	Apr. 08, 2018	Dec. 31, 2017
Line of Credit Facility [Line Items]
Debt fee			$ 698,000		$ 1,372,000
Senior Secured Revolving Credit Facility
Line of Credit Facility [Line Items]
Revolving credit facility			45,000,000		$ 0
Undrawn availability			15,000,000
Senior Secured Revolving Credit Facility | Jeffries Finance LLC
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	$ 45,000,000			$ 60,000,000
Limit on ability to sell, transfer or dispose of assets, aggregate amount			25,000,000
Limit on capital lease obligations, aggregate principal amount			$ 15,000,000
Credit facility agreement, term	3 years
Subsequent event | Senior Secured Revolving Credit Facility | Jeffries Finance LLC
Line of Credit Facility [Line Items]
Limit on ability to sell, transfer or dispose of assets, aggregate amount		$ 55,000,000
Limit on capital lease obligations, aggregate principal amount		$ 30,000,000

X

- Definition

Debt Instrument, Covenant Terms, Limit On Ability To Sell, Transfer Or Dispose Of Assets, Aggregate Amount

+ References

No definition available.

+ Details

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- Definition

Debt Instrument, Covenant Terms, Limit On Capital Lease Obligations, Aggregate Principal Amount

+ References

No definition available.

+ Details

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X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

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- Definition

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

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

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X

- Definition

Period remaining on line of credit facility before it terminates, 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

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://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

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- 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

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