Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements - Estimated Fair Value of Equity Securities Assumptions (Details)

v3.10.0.1
Fair Value Measurements - Estimated Fair Value of Equity Securities Assumptions (Details)
12 Months Ended
Apr. 03, 2018
Dec. 31, 2018
Discount for Lack of Marketability [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Valuation assumptions, measurement input 30 35
Liquidity of Shares [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Valuation assumptions, measurement input term 1 year 5 months 12 days 1 year 5 months 12 days
Liquidation [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Valuation assumptions, measurement input 65 20
Near-term Sale [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Valuation assumptions, measurement input 5 5
Near-term Financing [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Valuation assumptions, measurement input 30 75