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Fair Value Measurements (Contingent Purchase Price Consideration, Measured at Estimated Fair Value on Recurring Basis) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Liabilities:    
Warrants potentially settleable in cash $ 975 $ 1,309
Unobservable Inputs (Level 3)    
Liabilities:    
Contingent consideration 5,319 1,294
Fair Value, Measurements, Recurring    
Assets:    
Cash equivalents 6,774 1,662
Restricted cash equivalents   10,245
Total assets measured and recorded at fair value 6,774 11,907
Liabilities:    
Warrants potentially settleable in cash 975 1,309
Contingent consideration 5,319 1,294
Total liabilities measured and recorded at fair value 6,294 2,603
Fair Value, Measurements, Recurring | Quoted Prices In Active Markets (Level 1)    
Assets:    
Cash equivalents 6,774 1,662
Restricted cash equivalents   10,245
Total assets measured and recorded at fair value 6,774 11,907
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 975 1,309
Contingent consideration 5,319 1,294
Total liabilities measured and recorded at fair value $ 6,294 $ 2,603