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Fair Value Measurements - Contingent Purchase Price Consideration, Measured at Estimated Fair Value on Recurring Basis (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Liabilities:    
Warrants potentially settleable in cash $ 40 $ 55
Fair Value, Measurements, Recurring    
Assets:    
Cash equivalents 21,000 34,959
Restricted cash equivalents 100 100
Total assets measured and recorded at fair value 21,100 35,059
Liabilities:    
Warrants potentially settleable in cash 40 55
Contingent consideration 296 4,633
Total liabilities measured and recorded at fair value 336 4,688
Fair Value, Measurements, Recurring | Quoted Prices In  Active Markets (Level 1)    
Assets:    
Cash equivalents 21,000 34,959
Restricted cash equivalents 100 100
Total assets measured and recorded at fair value 21,100 35,059
Liabilities:    
Warrants potentially settleable in cash 0 0
Contingent consideration 0 0
Total liabilities measured and recorded at fair value 0 0
Fair Value, Measurements, Recurring | Significant Other Observable  Inputs (Level 2)    
Assets:    
Cash equivalents 0 0
Restricted cash equivalents 0
Total assets measured and recorded at fair value 0 0
Liabilities:    
Warrants potentially settleable in cash 0 0
Contingent consideration 0 0
Total liabilities measured and recorded at fair value 0 0
Fair Value, Measurements, Recurring | Unobservable  Inputs (Level 3)    
Assets:    
Cash equivalents 0 0
Restricted cash equivalents 0
Total assets measured and recorded at fair value 0 0
Liabilities:    
Warrants potentially settleable in cash 40 55
Contingent consideration 296 4,633
Total liabilities measured and recorded at fair value $ 336 $ 4,688