Debt, Warrants (Details)	Dec. 31, 2018 $ / shares shares
Affiliates [Member]
Warrants and Rights Note Disclosure [Abstract]
Warrants issued (in shares) \| shares	4
Exercise price of warrants (in dollars per share)	$ 30,912
Value of warrants (in dollars per share)	$ 22,764
Affiliates [Member] \| Expected Dividend Yield [Member]
Warrants and Rights Note Disclosure [Abstract]
Warrants measurement input	0
Affiliates [Member] \| Expected Stock Price Volatility [Member]
Warrants and Rights Note Disclosure [Abstract]
Warrants measurement input	0.8704
Affiliates [Member] \| Risk-Free Interest Rate [Member]
Warrants and Rights Note Disclosure [Abstract]
Warrants measurement input	0.0220
Affiliates [Member] \| Expected Warrant Option Life [Member]
Warrants and Rights Note Disclosure [Abstract]
Expected warrant option life	6 years 3 months
Silicon Valley Bank [Member]
Warrants and Rights Note Disclosure [Abstract]
Warrants issued (in shares) \| shares	9
Exercise price of warrants (in dollars per share)	$ 43,848
Value of warrants (in dollars per share)	$ 32,424
Silicon Valley Bank [Member] \| Expected Dividend Yield [Member]
Warrants and Rights Note Disclosure [Abstract]
Warrants measurement input	0
Silicon Valley Bank [Member] \| Expected Stock Price Volatility [Member]
Warrants and Rights Note Disclosure [Abstract]
Warrants measurement input	0.8807
Silicon Valley Bank [Member] \| Risk-Free Interest Rate [Member]
Warrants and Rights Note Disclosure [Abstract]
Warrants measurement input	0.0186
Silicon Valley Bank [Member] \| Expected Warrant Option Life [Member]
Warrants and Rights Note Disclosure [Abstract]
Expected warrant option life	6 years 3 months

Exercise price per share or per unit of warrants or rights outstanding.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(i)(4))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

Name:	us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(i)(2))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

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

- Definition

Price of a single share of a number of saleable stocks of a company.

+ References

No definition available.

+ Details

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

- References

No definition available.

+ Details

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

- Definition

Value of input used to measure outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

+ Details

Name:	us-gaap_WarrantsAndRightsOutstandingMeasurementInput
Namespace Prefix:	us-gaap_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

- Definition

Period between issuance and expiration of outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

+ Details

Name:	us-gaap_WarrantsAndRightsOutstandingTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationAxis=chfs_AffiliatesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputExpectedDividendRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputSharePriceMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputRiskFreeInterestRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputExpectedTermMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=chfs_SiliconValleyBankMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: