Amount of base rent expense per square foot for leased assets.

No definition available.

Name:	chfs_AnnualBaseRentPerSquareFoot
Namespace Prefix:	chfs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Annual increase in the amount of rent expense per square foot for leased assets.

+ References

No definition available.

+ Details

Name:	chfs_AnnualIncreasePerSquareFoot
Namespace Prefix:	chfs_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Percentage contingent consideration payable in excess of sale or disposal of business assets.

+ References

No definition available.

+ Details

Name:	chfs_BusinessCombinationContingentConsiderationPayableInExcessOfSaleOrDisposalOfBusinessAssets
Namespace Prefix:	chfs_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The contingent consideration period, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	chfs_BusinessCombinationContingentConsiderationPeriod
Namespace Prefix:	chfs_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Sale or disposal of business assets threshold for contingent consideration calculation.

+ References

No definition available.

+ Details

Name:	chfs_BusinessCombinationSaleOrDisposalOfBusinessAssetsThresholdForContingentConsideration
Namespace Prefix:	chfs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- References

No definition available.

+ Details

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

- References

No definition available.

+ Details

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

- Details

Name:	us-gaap_BusinessAcquisitionAxis=chfs_AquadexProductLineMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Commitments and Contingencies (Q3) (Details) - USD ($)		9 Months Ended	12 Months Ended
Commitments and Contingencies (Q3) (Details) - USD ($)	Aug. 05, 2016	Sep. 30, 2018	Dec. 31, 2017
Leases [Abstract]
Annual base rent from April 1, 2019 per square foot		$ 9
Annual increase per square foot		0.25
Aquadex Product Line [Member]
Contingent Consideration [Abstract]
Sale or disposal of business assets threshold for contingent consideration	$ 4,000,000	$ 4,000,000
Percentage of additional payments on disposal of business assets	40.00%	40.00%
Aquadex Product Line [Member] \| Maximum [Member]
Contingent Consideration [Abstract]
Contingent consideration period		3 years	3 years