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)

v3.20.2
Fair Value Measurements Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Marketable security gains (losses), net $ (1,400) $ 400 $ (1,500) $ 400
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 129,508   129,508  
Marketable securities 6,418   6,418  
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   0  
Marketable securities 0   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   0  
Marketable securities $ 0   $ 0