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Business Combinations - Narrative (Details)
4 Months Ended 12 Months Ended
Sep. 05, 2019
USD ($)
subsidiary
shares
Dec. 31, 2019
USD ($)
Dec. 31, 2020
business
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
business
Sep. 05, 2019
$ / shares
Business Acquisition [Line Items]            
Number of operating subsidiaries acquired | business     0   0  
Redwood            
Business Acquisition [Line Items]            
Number of operating subsidiaries acquired | subsidiary 4          
Consideration transferred $ 283,300,000          
Payments to acquire businesses $ 227,191,000          
Consideration transferred, common shares (in shares) | shares 5,086,586          
Consideration transferred, common shares, amount $ 56,109,000          
Consideration transferred, common shares, volume weighted average trading price (in dollars per share) | $ / shares           $ 14.74
Acquisition-related costs       $ 8,531,000    
Business acquisition, goodwill, expected tax deductible amount $ 0          
Revenue of acquiree since acquisition date   $ 3,364,000        
Loss of acquiree since acquisition date   $ 2,613,000        
Pro forma revenue       12,266,000 $ 7,630,000  
Pro forma net income (loss)       $ 1,112,000 $ 1,533,000