Quarterly report pursuant to Section 13 or 15(d)

Investments (Details)

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Investments (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2021
Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]      
Debt Securities, Held-to-maturity $ 21,500 $ 21,500 $ 150,400
Debt Securities, Available-for-sale 207,300 207,300 0
Marketable Securities [Line Items]      
Short-term investments 228,813 228,813 125,979
Long-term investments 0 0 24,380
Total investments 228,813 228,813 150,359
Interest Receivable 100 100 500
Unrealized gains on available-for-sale securities (2) 11  
Cashable Guaranteed Investment Certificate      
Marketable Securities [Line Items]      
Short-term investments 5,644 5,644 2,000
Corporate Bond      
Marketable Securities [Line Items]      
Short-term investments 25,435 25,435 40,372
Commercial Paper      
Marketable Securities [Line Items]      
Short-term investments 197,734 197,734 67,747
Treasury Bill      
Marketable Securities [Line Items]      
Short-term investments 0 0 7,999
Treasury Bond      
Marketable Securities [Line Items]      
Short-term investments 0 0 5,045
Yankee Bond      
Marketable Securities [Line Items]      
Short-term investments 0 0 2,816
Corporate Bonds      
Marketable Securities [Line Items]      
Long-term investments $ 0 $ 0 $ 24,380