XML 85 R51.htm IDEA: XBRL DOCUMENT
v3.22.1

Income Taxes (Schedule of Roll Forward of Valuation Allowance) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Income Tax Disclosure [Abstract] |  |
Balance at January 1 | $ 6,200 | $ 4,248
Currency transaction loss | 2,425 | 583
Tax assets acquired through merger | 24,535 |
Income tax expense | 2,870 | 1,369
Balance at December 31 | $ 36,030 | $ 6,200

X
- Definition Amount of increase (decrease) in the valuation allowance due to currency transaction loss. + References No definition available. + Details
Name: | cmmb_CurrencyTransactionLossValuationAllowance
Namespace Prefix: | cmmb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of increase (decrease) in the valuation allowance due to income tax expense. + References No definition available. + Details
Name: | cmmb_IncomeTaxExpenseValuationAllowance
Namespace Prefix: | cmmb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of increase (decrease) in the valuation allowance due to tax assets acquired through merger. + References No definition available. + Details
Name: | cmmb_TaxAssetsAcquiredThroughMergerValuationAllowance
Namespace Prefix: | cmmb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32537-109319 + Details
Name: | us-gaap_DeferredTaxAssetsValuationAllowance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_IncomeTaxDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration