Quarterly report pursuant to Section 13 or 15(d)

Investments (Details)

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Investments (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]      
Debt Securities, Held-to-maturity $ 48,500 $ 48,500 $ 150,400
Debt Securities, Available-for-sale 153,600 153,600 0
Marketable Securities [Line Items]      
Short-term investments 197,176 197,176 125,979
Long-term investments 5,004 5,004 24,380
Total investments 202,180 202,180 150,359
Interest Receivable 300 300 500
Unrealized gains on available-for-sale securities 7 13  
Cashable Guaranteed Investment Certificate      
Marketable Securities [Line Items]      
Short-term investments 2,502 2,502 2,000
Corporate Bond      
Marketable Securities [Line Items]      
Short-term investments 35,048 35,048 40,372
Commercial Paper      
Marketable Securities [Line Items]      
Short-term investments 152,923 152,923 67,747
Treasury Bill      
Marketable Securities [Line Items]      
Short-term investments 3,910 3,910 7,999
Treasury Bond      
Marketable Securities [Line Items]      
Short-term investments 0 0 5,045
Yankee Bond      
Marketable Securities [Line Items]      
Short-term investments 2,793 2,793 2,816
Corporate Bonds      
Marketable Securities [Line Items]      
Long-term investments $ 5,004 $ 5,004 $ 24,380