It represents as a additional proceeds from issuance initial public offering.

No definition available.

Name:	CMSS_AdditionalProceedsFromIssuanceInitialPublicOffering
Namespace Prefix:	CMSS_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Represents the assets held in trust noncurrent fair value.

+ References

No definition available.

+ Details

Name:	CMSS_AssetsHeldInTrustNoncurrentFairValue
Namespace Prefix:	CMSS_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

It represents as a costs of liquidating.

+ References

No definition available.

+ Details

Name:	CMSS_CostsOfLiquidating
Namespace Prefix:	CMSS_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Limit amount of net tangible assets.

+ References

No definition available.

+ Details

Name:	CMSS_LimitOfNetTangibleAssets
Namespace Prefix:	CMSS_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Represents the proceeds from repayments of sponsor loan.

+ References

No definition available.

+ Details

Name:	CMSS_ProceedsFromRepaymentsOfSponsorLoan
Namespace Prefix:	CMSS_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3044-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.1)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The cash inflow associated with the amount received from entity's first offering of stock to the public.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585

+ Details

Name:	us-gaap_ProceedsFromIssuanceInitialPublicOffering
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow from the additional capital contribution to the entity.

+ References

+ Details

Name:	us-gaap_ProceedsFromIssuanceOfCommonStock
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow associated with the amount received from entity's raising of capital via private rather than public placement.

+ References

+ Details

Name:	us-gaap_ProceedsFromIssuanceOfPrivatePlacement
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.

+ References

No definition available.

+ Details

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

- Definition

Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

+ References

No definition available.

+ Details

Name:	us-gaap_SaleOfStockPricePerShare
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Describe the nature and terms of the financial instrument, and the rights and obligations embodied in the instrument. Include settlement alternatives, if any, in the contract and identify the entity that controls the settlement alternatives.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 480
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=109262807&loc=d3e22026-110879

+ Details

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

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=us-gaap_IPOMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=CMSS_UnderwriterMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=CMSS_TrustAccountMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=us-gaap_PrivatePlacementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=CMSS_SponsorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_TypeOfArrangementAxis=CMSS_UnderwritingAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=us-gaap_OverAllotmentOptionMember
Namespace Prefix:
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Organization and Business Operations (Details Narrative) - USD ($)			3 Months Ended	12 Months Ended
	Nov. 03, 2017	Oct. 30, 2017	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Limit of net tangible assets			$ 5,000,001
Cash			83,648	$ 165,405
Proceeds from sale of ordinary shares to initial shareholders			31,038
Proceeds and repayments of sponsor loan			663,009
Investment held in trust account, fair value			$ 207,384,748	$ 206,715,209
Initial Public Offering [Member]
Number of shares issued in transaction		18,000,000
Proceeds from issuance initial public offering		$ 180,000,000
Units (in dollars per share)		$ 10.00	$ 0.10
Investment held in trust account, fair value			$ 2,063,629
Initial Public Offering [Member] \| Underwriter [Member]
Number of shares issued in transaction		900,000
Proceeds from issuance initial public offering		$ 9,000,000
Units (in dollars per share)		$ 10.00
Initial Public Offering [Member] \| Trust Account [Member]
Description of redemption settlement terms			The Company will provide its shareholders with the opportunity to redeem all or a portion of their shares included in the Public Units sold in the Initial Public Offering (the “Public Shares”) upon the completion of a Business Combination either (i) in connection with a shareholder meeting called to approve the Business Combination or (ii) by means of a tender offer. The decision as to whether the Company will seek shareholder approval of a Business Combination or conduct a tender offer will be made by the Company, solely in its discretion. The shareholders will be entitled to redeem their shares for a pro rata portion of the amount then on deposit in the Trust Account (initially approximately $10.00 per share, plus any pro rata interest earned on the funds held in the Trust Account and not previously released to the Company to pay its tax obligations).
Costs of liquidating			$ 18,500
Private Placement Warrants [Member]
Number of shares issued in transaction	52,726
Units (in dollars per share)	$ 10.00
Proceeds from issuance of private placement	$ 527,260
Private Placement Warrants [Member] \| Sponsor [Member]
Number of shares issued in transaction		475,000
Units (in dollars per share)		$ 10.00
Proceeds from issuance of private placement		$ 4,750,000
Private Placement Warrants [Member] \| Sponsor [Member] \| Underwriting Agreement [Member]
Units (in dollars per share)			$ 10.00
Private Placement Warrants [Member] \| Underwriter [Member] \| Underwriting Agreement [Member]
Number of shares issued in transaction			54,000
Units (in dollars per share)			$ 10.00
Over-Allotment Option [Member] \| Underwriter [Member]
Number of shares issued in transaction	2,636,293
Proceeds from issuance initial public offering	$ 26,362,930
Units (in dollars per share)	$ 10.00
Additional proceeds from offering	$ 26,362,930
Over-Allotment Option [Member] \| Underwriter [Member] \| Underwriting Agreement [Member]
Number of shares issued in transaction			2,700,000	2,700,000