Notes Payable - Summary of Detailed Information about Financial Covenants Ratios (Detail)	Dec. 31, 2019
Minimum [Member]
Notes Payable [Line Items]
Total leverage ratio	3.00
Maximum [Member]
Notes Payable [Line Items]
Interest coverage ratio	3.00

Debt to earnings before interest, tax, depreciation and amortization ratio.

No definition available.

Name:	crhm_DebtToEarningsBeforeInterestTaxDepreciationAndAmortizationRatio
Namespace Prefix:	crhm_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant