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Fair Value Measurements (Contingent Purchase Price Consideration, Measured at Estimated Fair Value on Recurring Basis) (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Liabilities:    
Warrants potentially settleable in cash $ 8,510 $ 1,860
Unobservable Inputs (Level 3)    
Liabilities:    
Contingent purchase price consideration 1,227 1,095
Fair Value, Measurements, Recurring    
Assets:    
Cash equivalents 17,131 16,192
Restricted cash equivalents 13,212 17,622
Total assets 30,343 33,814
Liabilities:    
Warrants potentially settleable in cash 8,510 1,860
Contingent purchase price consideration 1,227 1,095
Total liabilities 9,737 2,955
Fair Value, Measurements, Recurring | Quoted Prices In Active Markets (Level 1)    
Assets:    
Cash equivalents 17,131 16,192
Restricted cash equivalents 13,212 17,622
Total assets 30,343 33,814
Liabilities:    
Warrants potentially settleable in cash 0 0
Contingent purchase price consideration 0 0
Total liabilities 0 0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)    
Assets:    
Cash equivalents 0 0
Restricted cash equivalents 0 0
Total assets 0 0
Liabilities:    
Warrants potentially settleable in cash 8,510 1,860
Contingent purchase price consideration 0 0
Total liabilities 8,510 1,860
Fair Value, Measurements, Recurring | Unobservable Inputs (Level 3)    
Assets:    
Cash equivalents 0 0
Restricted cash equivalents 0 0
Total assets 0 0
Liabilities:    
Warrants potentially settleable in cash 0 0
Contingent purchase price consideration 1,227 1,095
Total liabilities $ 1,227 $ 1,095