Annual report pursuant to Section 13 and 15(d)

Cash Equivalents and Equity Securities - Narrative (Details)

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Cash Equivalents and Equity Securities - Narrative (Details) - USD ($)
$ in Thousands, shares in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2009
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Equity Securities, Available-for-sale [Line Items]          
Cash and cash equivalents     $ 90,498 $ 53,039 $ 31,219
Initial ownership percentage at the time of investment 16.60%        
Statutory resale restriction expiry period 4 months        
Equity securities, estimated fair value       588  
Loss on investment in equity securities     525 83 $ 0
Equity Securities          
Equity Securities, Available-for-sale [Line Items]          
Number of common shares sold (in shares)   1.3      
Proceeds from sales of equity securities   $ 100      
Equity securities, estimated fair value   $ 0      
Equity Securities | Other Expense          
Equity Securities, Available-for-sale [Line Items]          
Loss on investment in equity securities     500 84  
Demand Deposits          
Equity Securities, Available-for-sale [Line Items]          
Cash and cash equivalents     $ 19,300 $ 21,800