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Fair Value Measurements (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Carrying Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets measured and recorded at fair value $ 323 $ 35,195
Total liabilities measured and recorded at fair value 40,000 0
Fair Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets measured and recorded at fair value 323 35,195
Total liabilities measured and recorded at fair value 40,000 0
Fair Value | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets measured and recorded at fair value 323 35,195
Total liabilities measured and recorded at fair value 0 0
Fair Value | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets measured and recorded at fair value 0  
Total liabilities measured and recorded at fair value 40,000  
Money market funds | Carrying Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets measured and recorded at fair value 323 35,195
Money market funds | Fair Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets measured and recorded at fair value 323 35,195
Money market funds | Fair Value | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets measured and recorded at fair value 323 35,195
Money market funds | Fair Value | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets measured and recorded at fair value 0  
Earnout liability - current | Carrying Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total liabilities measured and recorded at fair value 20,730 0
Earnout liability - current | Fair Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total liabilities measured and recorded at fair value 20,730 0
Earnout liability - current | Fair Value | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total liabilities measured and recorded at fair value 0 0
Earnout liability - current | Fair Value | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total liabilities measured and recorded at fair value 20,730  
Earnout liability - non-current | Carrying Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total liabilities measured and recorded at fair value 19,270 0
Earnout liability - non-current | Fair Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total liabilities measured and recorded at fair value 19,270 0
Earnout liability - non-current | Fair Value | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total liabilities measured and recorded at fair value 0 $ 0
Earnout liability - non-current | Fair Value | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total liabilities measured and recorded at fair value $ 19,270