Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements - Assets Measured at Fair Value on a Non-recurring Basis (Details)

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Fair Value Measurements - Assets Measured at Fair Value on a Non-recurring Basis (Details) - USD ($)
$ in Thousands
 12 Months Ended
Oct. 01, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis        
Intangible asset impairment charge   $ 1,600 $ 0 $ 0
Nonrecurring        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis        
In-process research and development intangible assets, gross $ 6,800      
In-process research and development intangible assets 5,200      
Intangible asset impairment charge $ 1,600      
Estimate of Fair Value Measurement | Nonrecurring        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis        
In-process research and development intangible assets   5,200    
Estimate of Fair Value Measurement | Nonrecurring | Quoted Prices in Active Markets (Level 1)        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis        
In-process research and development intangible assets   0    
Estimate of Fair Value Measurement | Nonrecurring | Significant Other Observable Inputs (Level 2)        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis        
In-process research and development intangible assets   0    
Estimate of Fair Value Measurement | Nonrecurring | Significant Unobservable Inputs (Level 3)        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis        
In-process research and development intangible assets   5,200    
Change Measurement During Period | Nonrecurring        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis        
In-process research and development intangible assets   $ (1,600)