Annual report pursuant to Section 13 and 15(d)

Income Taxes - Additional Information (Details)

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Income Taxes - Additional Information (Details) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Tax Contingency [Line Items]      
Valuation allowance $ 8,583,000 $ 7,931,000  
Interest rate swaps 122,000 184,000  
Net operating losses 14,355,000 10,010,000  
Tax benefit from Section 179D credits and deductions 29,700,000    
Unrecognized tax benefits 400,000 1,600,000 $ 600,000
Unrecognized tax benefits that would impact effective tax rate 80,000 705,000  
Interest deduction carryforward 19,659,000    
Operating loss carryforward 35,939,000 28,911,000  
Earnings with no repatriation tax 0    
Amount of (decrease) increase included in tax expense for interest and penalties related to uncertain tax positions 19,000 (50,000) $ 60,000
Foreign Tax Authority      
Income Tax Contingency [Line Items]      
Deferred tax assets, foreign 8,169,000 7,500,000  
Operating loss carryforward 25,939,000    
State      
Income Tax Contingency [Line Items]      
Net operating losses 45,260,000    
Federal      
Income Tax Contingency [Line Items]      
Net operating losses 34,090,000    
Operating loss carryforward 35,024,000    
Subsidiaries | State      
Income Tax Contingency [Line Items]      
Net operating losses $ 292,000 $ 247,000