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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 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Error Corrections and Prior Period Adjustments Restatement [Line Items]                
Revenue $ 6,464 $ 5,337 $ 13,430 $ 10,219        
Interest (expense) (93) (116) (257) (134)        
Other income, net 28 27 37 84        
Net income (loss) 1,180 (237) 1,168 (152)        
Additional paid-in capital 199,767 198,358 199,767 198,358   $ 199,372    
Accumulated deficit (194,030) (196,243) (194,030) (196,243)   (195,198)    
Total equity 9,921 6,298 9,921 $ 6,298 $ 8,547 $ 8,357 $ 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)   (132)   $ (166)        
Other income, net   16   16        
Net income (loss)   (253)   (184)        
Additional paid-in capital   197,333   197,333        
Accumulated deficit   (194,503)   (194,503)        
Total equity   7,013   7,013        
Adjustment                
Error Corrections and Prior Period Adjustments Restatement [Line Items]                
Interest (expense)   16   32        
Other income, net   11   68        
Net income (loss)   16   32        
Additional paid-in capital   1,025   1,025        
Accumulated deficit   (1,740)   (1,740)        
Total equity   (715)   (715)        
Asset Management                
Error Corrections and Prior Period Adjustments Restatement [Line Items]                
Revenue 4,140 4,439 9,575 8,593        
Direct costs $ 3,217 3,940 $ 7,849 7,607        
Asset Management | As previously reported                
Error Corrections and Prior Period Adjustments Restatement [Line Items]                
Revenue   4,024   7,885        
Direct costs   3,514   6,831        
Asset Management | Adjustment                
Error Corrections and Prior Period Adjustments Restatement [Line Items]                
Revenue   415   708        
Direct costs   $ 426   $ 776