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Revision of Prior Period Financial Statements - Schedule of Financial Statement Line Item Correction of the Amounts Previously Reported to the Revised Amounts (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Error Corrections and Prior Period Adjustments Restatement [Line Items]                    
Revenue $ 7,330 $ 5,680 $ 20,760 $ 15,899            
Interest (expense) (63) (170) (320) (304)            
Other income, net 55 47 92 131            
Net income (loss) 423 (627) 1,591 (779)            
Additional paid-in capital 199,953 199,209 199,953 199,209     $ 199,372      
Accumulated deficit (193,607) (196,870) (193,607) (196,870)     (195,198)      
Total equity 10,530 6,522 10,530 $ 6,522 $ 9,921 $ 8,547 $ 8,357 $ 6,298 $ 6,298 $ 5,817
Error correction, type [Extensible List]       chci:IncorrectAccountingForDebtDiscountsAndReimbursementsOfSalaryRelatedCostsMember            
As previously reported                    
Error Corrections and Prior Period Adjustments Restatement [Line Items]                    
Interest (expense)   (186)   $ (352)            
Other income, net   0   16            
Net income (loss)   (643)   (827)            
Additional paid-in capital   198,184   198,184            
Accumulated deficit   (195,146)   (195,146)            
Total equity   7,221   7,221            
Adjustment                    
Error Corrections and Prior Period Adjustments Restatement [Line Items]                    
Interest (expense)   16   48            
Other income, net   47   115            
Net income (loss)   16   48            
Additional paid-in capital   1,025   1,025            
Accumulated deficit   (1,724)   (1,724)            
Total equity   (699)   (699)            
Asset Management                    
Error Corrections and Prior Period Adjustments Restatement [Line Items]                    
Revenue 5,891 4,733 15,466 13,326            
Direct costs $ 5,066 4,197 $ 12,915 11,804            
Asset Management | As previously reported                    
Error Corrections and Prior Period Adjustments Restatement [Line Items]                    
Revenue   4,293   12,178            
Direct costs   3,710   10,541            
Asset Management | Adjustment                    
Error Corrections and Prior Period Adjustments Restatement [Line Items]                    
Revenue   440   1,148            
Direct costs   $ 487   $ 1,263