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Fair Value Measurements - Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning balance $ 1,153,000 $ 2,554,000  
Payment of Chiaro contingent consideration (1,039,000) 0 $ (1,000,000)
Ending balance 0 1,153,000 $ 2,554,000
GVi Ventures, Inc.      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning balance 0    
Fair value adjustment   (1,646,000)  
Ending balance 0 0  
Chiaro Technologies LLC      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair value adjustment (114,000) $ 245,000  
Payment of Chiaro contingent consideration $ (1,039,000)