Investments (Details 3) - Short Term Investment (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Debt Securities, Available-for-Sale [Line Items]
Estimated Fair Value, Total	$ 405,001	$ 414,126
Unrealized Losses, Total	3,417	763
U.S. Treasury debt securities
Debt Securities, Available-for-Sale [Line Items]
Estimated Fair Value, Total	119,232	80,444
Unrealized Losses, Total	965	198
Municipal securities
Debt Securities, Available-for-Sale [Line Items]
Estimated Fair Value, Total	19,661	23,352
Unrealized Losses, Total	278	48
Corporate debt securities
Debt Securities, Available-for-Sale [Line Items]
Estimated Fair Value, Total	181,643	250,467
Unrealized Losses, Total	1,767	458
Commercial Paper
Debt Securities, Available-for-Sale [Line Items]
Estimated Fair Value, Total	84,465	59,863
Unrealized Losses, Total	407	59
Short-term Investments [Member]
Debt Securities, Available-for-Sale [Line Items]
Estimated Fair Value, Less Than 12 Months	373,847	414,126
Unrealized Losses, Less Than 12 Months	3,384	763
Short-term Investments [Member] | U.S. Treasury debt securities
Debt Securities, Available-for-Sale [Line Items]
Estimated Fair Value, Less Than 12 Months	119,232	80,444
Unrealized Losses, Less Than 12 Months	965	198
Estimated Fair Value, 12 Months or Greater
Unrealized Losses, 12 Months or Greater
Short-term Investments [Member] | Municipal securities
Debt Securities, Available-for-Sale [Line Items]
Estimated Fair Value, Less Than 12 Months	19,661	23,352
Unrealized Losses, Less Than 12 Months	278	48
Estimated Fair Value, 12 Months or Greater
Unrealized Losses, 12 Months or Greater
Short-term Investments [Member] | Corporate debt securities
Debt Securities, Available-for-Sale [Line Items]
Estimated Fair Value, Less Than 12 Months	150,489	250,467
Unrealized Losses, Less Than 12 Months	1,734	458
Estimated Fair Value, 12 Months or Greater	31,154
Unrealized Losses, 12 Months or Greater	33
Short-term Investments [Member] | Commercial Paper
Debt Securities, Available-for-Sale [Line Items]
Estimated Fair Value, Less Than 12 Months	84,465	59,863
Unrealized Losses, Less Than 12 Months	407	59
Estimated Fair Value, 12 Months or Greater
Unrealized Losses, 12 Months or Greater
Long-term Investments [Member]
Debt Securities, Available-for-Sale [Line Items]
Estimated Fair Value, 12 Months or Greater	31,154	0
Unrealized Losses, 12 Months or Greater	$ 33
Long-term Investments [Member] | U.S. Treasury debt securities
Debt Securities, Available-for-Sale [Line Items]
Estimated Fair Value, 12 Months or Greater
Unrealized Losses, 12 Months or Greater
Long-term Investments [Member] | Municipal securities
Debt Securities, Available-for-Sale [Line Items]
Estimated Fair Value, 12 Months or Greater
Unrealized Losses, 12 Months or Greater
Long-term Investments [Member] | Corporate debt securities
Debt Securities, Available-for-Sale [Line Items]
Estimated Fair Value, 12 Months or Greater
Unrealized Losses, 12 Months or Greater
Long-term Investments [Member] | Commercial Paper
Debt Securities, Available-for-Sale [Line Items]
Estimated Fair Value, 12 Months or Greater
Unrealized Losses, 12 Months or Greater