XML 82 R67.htm IDEA: XBRL DOCUMENT v3.20.4
Fair Value Measurements - Summary of Company's Fair Value Hierarchy for its Financial Assets and Liabilities (Detail) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Liabilities:      
Fair value of liabilities     $ 0
Fair Value, Measurements, Recurring [Member]      
Assets:      
Fair value of investments $ 503,000 $ 2,354,000  
Liabilities:      
Fair value of liabilities (1,144,000) (2,655,000)  
Fair Value, Measurements, Recurring [Member] | Interest Rate Swap [Member]      
Liabilities:      
Fair value of liabilities (1,144,000) (144,000)  
Fair Value, Measurements, Recurring [Member] | Contingent Purchase Price [Member]      
Liabilities:      
Fair value of liabilities   (2,511,000)  
Fair Value, Measurements, Recurring [Member] | Money Market Funds [Member]      
Assets:      
Fair value of cash equivalents 503,000 2,354,000  
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]      
Assets:      
Fair value of investments 503,000 2,354,000  
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Money Market Funds [Member]      
Assets:      
Fair value of cash equivalents 503,000 2,354,000  
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2      
Liabilities:      
Fair value of liabilities (1,144,000) (144,000)  
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 | Interest Rate Swap [Member]      
Liabilities:      
Fair value of liabilities $ (1,144,000) (144,000)  
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]      
Liabilities:      
Fair value of liabilities   (2,511,000)  
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Contingent Purchase Price [Member]      
Liabilities:      
Fair value of liabilities   $ (2,511,000)