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.

No definition available.

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of shares authorized for issuance under share-based payment arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of shares issued under share-based payment arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_AwardTypeAxis=imxi_EmployeeStockOptionClassBMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=imxi_EmployeeStockOptionClassCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=imxi_EmployeeStockOptionClassDMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

STOCKHOLDER'S EQUITY AND SHARE-BASED COMPENSATION, Incentive Units Authorized and Issued (Details) - shares	1 Months Ended
	Sep. 30, 2017	Feb. 28, 2017	Dec. 31, 2017
Class B
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized (in shares)			10,000,000
Units Issued (in shares)	665,000	9,055,000
Class C
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized (in shares)			5,000,000
Units Issued (in shares)	332,500	4,527,500
Class D
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized (in shares)			5,000,000
Units Issued (in shares)	332,500	4,527,500