Asset acquisitions - Summary of Fair Value of Consideration Transferred and Allocated Costs of Assets and Liabilities Acquired at Acquisition Date (Detail) - USD ($)	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Assets and liabilities acquired:
CRH ownership interest	100.00%
Anesthesia Services [Member]
Business Acquisition [Line Items]
Cash	$ 15,032,311	$ 27,193,148
Acquisition costs	251,469	316,663
Deferred consideration	627,645
Pre-transaction equity interest	1,595,275
Purchase consideration	17,506,700	27,509,811
Non-controlling interest	11,419,673	13,241,061
Fair value of net identifiable assets and liabilities acquired	28,926,373	40,750,872
Assets and liabilities acquired:
Exclusive professional services agreements	27,182,915	40,646,723
Cash	115,397
Accounts receivable	1,950,219
Prepaid expenses and deposits	1,518	104,149
Trade payables and other accruals	(323,676)
Pre-close accounts receivable	50,000	652,506
Pre-close accounts payable	(50,000)	(652,506)
Fair value of net identifiable assets and liabilities acquired	28,926,373	40,750,872
Anesthesia Services [Member] \| ACA [Member]
Business Acquisition [Line Items]
Cash	5,239,003
Acquisition costs	116,025
Purchase consideration	5,355,028
Fair value of net identifiable assets and liabilities acquired	5,355,028
Assets and liabilities acquired:
Exclusive professional services agreements	5,355,028
Pre-close accounts receivable	50,000
Pre-close accounts payable	(50,000)
Fair value of net identifiable assets and liabilities acquired	$ 5,355,028
Exclusive professional services agreements – amortization term	6 years
CRH ownership interest	100.00%
Anesthesia Services [Member] \| SMAA [Member]
Business Acquisition [Line Items]
Cash	$ 1,752,465
Acquisition costs	38,966
Purchase consideration	1,791,431
Non-controlling interest	1,465,716
Fair value of net identifiable assets and liabilities acquired	3,257,147
Assets and liabilities acquired:
Exclusive professional services agreements	3,257,147
Fair value of net identifiable assets and liabilities acquired	$ 3,257,147
Exclusive professional services agreements – amortization term	5 years
CRH ownership interest	55.00%
Anesthesia Services [Member] \| CRAA [Member]
Business Acquisition [Line Items]
Cash	$ 2,130,000
Acquisition costs	44,003
Purchase consideration	2,174,003
Non-controlling interest	2,088,748
Fair value of net identifiable assets and liabilities acquired	4,262,751
Assets and liabilities acquired:
Exclusive professional services agreements	4,262,751
Fair value of net identifiable assets and liabilities acquired	$ 4,262,751
Exclusive professional services agreements – amortization term	5 years
CRH ownership interest	51.00%
Anesthesia Services [Member] \| TSA [Member]
Business Acquisition [Line Items]
Cash	$ 3,185,843
Acquisition costs	15,173
Deferred consideration	627,645
Pre-transaction equity interest	1,595,275
Purchase consideration	5,423,936
Non-controlling interest	5,211,233
Fair value of net identifiable assets and liabilities acquired	10,635,169
Assets and liabilities acquired:
Exclusive professional services agreements	8,891,711
Cash	115,397
Accounts receivable	1,950,219
Prepaid expenses and deposits	1,518
Trade payables and other accruals	(323,676)
Fair value of net identifiable assets and liabilities acquired	$ 10,635,169
Exclusive professional services agreements – amortization term	5 years
CRH ownership interest	51.00%
Anesthesia Services [Member] \| FPAA [Member]
Business Acquisition [Line Items]
Cash	$ 2,725,000
Acquisition costs	37,302
Purchase consideration	2,762,302
Non-controlling interest	2,653,976
Fair value of net identifiable assets and liabilities acquired	5,416,278
Assets and liabilities acquired:
Exclusive professional services agreements	5,416,278
Fair value of net identifiable assets and liabilities acquired	$ 5,416,278
Exclusive professional services agreements – amortization term	5 years
CRH ownership interest	51.00%
Anesthesia Services [Member] \| Shreveport Sedation Associates LLC [Member]
Business Acquisition [Line Items]
Cash		9,404,148
Acquisition costs		91,036
Purchase consideration		9,495,184
Non-controlling interest		0
Fair value of net identifiable assets and liabilities acquired		9,495,184
Assets and liabilities acquired:
Exclusive professional services agreements		9,391,036
Prepaid expenses and deposits		104,149
Pre-close accounts receivable		0
Pre-close accounts payable		0
Fair value of net identifiable assets and liabilities acquired		$ 9,495,185
Exclusive professional services agreements – amortization term		7 years
CRH ownership interest		100.00%
Anesthesia Services [Member] \| Western Ohio Sedation Associates LLC [Member]
Business Acquisition [Line Items]
Cash		$ 6,409,000
Acquisition costs		74,698
Purchase consideration		6,483,698
Non-controlling interest		6,229,435
Fair value of net identifiable assets and liabilities acquired		12,713,133
Assets and liabilities acquired:
Exclusive professional services agreements		12,713,133
Prepaid expenses and deposits		0
Pre-close accounts receivable		0
Pre-close accounts payable		0
Fair value of net identifiable assets and liabilities acquired		$ 12,713,133
Exclusive professional services agreements – amortization term		10 years
CRH ownership interest		51.00%
Anesthesia Services [Member] \| Lake Washington Anesthesia LLC [Member]
Business Acquisition [Line Items]
Cash		$ 5,000,000
Acquisition costs		41,939
Purchase consideration		5,041,939
Non-controlling interest		4,844,217
Fair value of net identifiable assets and liabilities acquired		9,886,156
Assets and liabilities acquired:
Exclusive professional services agreements		9,886,155
Prepaid expenses and deposits		0
Pre-close accounts receivable		652,506
Pre-close accounts payable		(652,506)
Fair value of net identifiable assets and liabilities acquired		$ 9,886,155
Exclusive professional services agreements – amortization term		7 years
CRH ownership interest		51.00%
Anesthesia Services [Member] \| Lake Erie Sedation Associates LLC [Member]
Business Acquisition [Line Items]
Cash		$ 4,180,000
Acquisition costs		53,115
Purchase consideration		4,233,115
Non-controlling interest		0
Fair value of net identifiable assets and liabilities acquired		4,233,115
Assets and liabilities acquired:
Exclusive professional services agreements		4,233,115
Prepaid expenses and deposits		0
Pre-close accounts receivable		0
Pre-close accounts payable		0
Fair value of net identifiable assets and liabilities acquired		$ 4,233,115
Exclusive professional services agreements – amortization term		10 years
CRH ownership interest		100.00%
Anesthesia Services [Member] \| Tennessee Valley Anesthesia LLC [Member]
Business Acquisition [Line Items]
Cash		$ 2,200,000
Acquisition costs		55,875
Purchase consideration		2,255,875
Non-controlling interest		2,167,409
Fair value of net identifiable assets and liabilities acquired		4,423,284
Assets and liabilities acquired:
Exclusive professional services agreements		4,423,284
Fair value of net identifiable assets and liabilities acquired		$ 4,423,284
Exclusive professional services agreements – amortization term		7 years
CRH ownership interest		51.00%

Business combination consideration transferred deferred consideration.

No definition available.

Name:	crhm_BusinessCombinationConsiderationTransferredDeferredConsideration
Namespace Prefix:	crhm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Business combination recognized identifiable assets acquired and liabilities assumed accounts receivable.

+ References

No definition available.

+ Details

Name:	crhm_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccountsReceivable
Namespace Prefix:	crhm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Business combination recognized identifiable assets acquired and liabilities assumed trade payables and other accruals.

+ References

No definition available.

+ Details

Name:	crhm_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedTradePayablesAndOtherAccruals
Namespace Prefix:	crhm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275

+ Details

Name:	us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of direct costs of the business combination including legal, accounting, and other costs incurred to consummate the business acquisition.

+ References

No definition available.

+ Details

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

- Definition

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.

+ References

No definition available.

+ Details

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

- Definition

Percentage of voting equity interests acquired at the acquisition date in the business combination.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

+ Details

Name:	us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

This element represents the fair value of the noncontrolling interest in the acquiree at the acquisition date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (e)(1)
-URI http://asc.fasb.org/extlink&oid=116869197&loc=d3e4845-128472

+ Details

Name:	us-gaap_BusinessCombinationAcquisitionOfLessThan100PercentNoncontrollingInterestFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=116859721&loc=d3e6613-128477

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=116859721&loc=d3e6578-128477

+ Details

Name:	us-gaap_BusinessCombinationConsiderationTransferred1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination.

+ References

+ Details

Name:	us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of assets acquired at the acquisition date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=116869197&loc=d3e4845-128472

+ Details

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

- Definition

Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. 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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=116869197&loc=d3e4845-128472

+ Details

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

- Definition

Amount of asset related to consideration paid in advance for costs that provide economic benefits in future periods, and amount of other assets that are expected to be realized or consumed within one year or the normal operating cycle, if longer, acquired at the acquisition date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=116869197&loc=d3e4845-128472

+ Details

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

- Definition

Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=116869197&loc=d3e4845-128472

+ Details

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

- Definition

Amount of liabilities assumed at the acquisition date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=116869197&loc=d3e4845-128472

+ Details

Name:	us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- References

No definition available.

+ Details

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

- Definition

Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 55
-Paragraph 37
-URI http://asc.fasb.org/extlink&oid=116868840&loc=d3e2207-128464

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=116869197&loc=d3e4845-128472

+ Details

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

- Definition

Amount recognized as of the acquisition date for the assets, including goodwill, in excess of (less than) the aggregate liabilities assumed, less the noncontrolling interest in the acquiree.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=116869197&loc=d3e4845-128472

+ Details

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

- Definition

The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585

+ Details

Name:	us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=crhm_AnesthesiaServicesSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

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

- Details

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

- Details

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

- Details

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

- Details

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

- Details

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

- Details

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

- Details

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

- Details

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