Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details)

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Fair Value Measurements Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2020
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Marketable security gains (losses), net $ (100)
Fair Value, Measurements, Recurring | Level 1  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Cash, cash equivalents, restricted cash and restricted cash equivalents 77,330
Marketable securities 7,832
Fair Value, Measurements, Recurring | Level 2  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Cash, cash equivalents, restricted cash and restricted cash equivalents 0
Marketable securities 0
Fair Value, Measurements, Recurring | Level 3  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Cash, cash equivalents, restricted cash and restricted cash equivalents 0
Marketable securities $ 0