Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies (Restricted Cash) (Details)

v3.19.3.a.u2
Summary of Significant Accounting Policies (Restricted Cash) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Restricted Cash and Cash Equivalents Items [Line Items]        
Cash and cash equivalents $ 82,505 $ 289,345 $ 60,115  
Prepaid outside information services 2,209 1,515    
Total cash, cash equivalents and restricted cash 82,755 289,671 62,263 $ 54,740
Prepaid expense and other current assets        
Restricted Cash and Cash Equivalents Items [Line Items]        
Prepaid outside information services 82 158 2,000  
Other non-current assets        
Restricted Cash and Cash Equivalents Items [Line Items]        
Prepaid outside information services $ 168 $ 168 $ 148