Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements Rollforward (Details)

v3.20.1
Fair Value Measurements Rollforward (Details) - USD ($)
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Change in fair value $ (36,000) $ 289,000
Fair value, measurements, recurring    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at December 31, 2019 2,939,000  
Balance at March 31, 2020 2,903,000  
Fair value, measurements, recurring | Significant Unobservable Inputs (Level 3)    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at December 31, 2019 2,939,000  
Change in fair value (36,000)  
Balance at March 31, 2020 $ 2,903,000