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Investments and Fair Value Measurements - Components of Investments (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Cost Basis	$ 105,309	$ 105,546
Unrealized Gains (Losses)	(132)	(22)
Market Value	105,177	105,524
Cash and Cash Equivalents
Debt Securities, Available-for-sale [Line Items]
Market Value	43,555	38,301
Short-term Investments and Marketable Securities
Debt Securities, Available-for-sale [Line Items]
Market Value	53,438	55,179
Long-term Investments
Debt Securities, Available-for-sale [Line Items]
Market Value	8,184	12,044
Level 1 | Money market fund
Debt Securities, Available-for-sale [Line Items]
Cost Basis	43,555	38,301
Unrealized Gains (Losses)	0	0
Market Value	43,555	38,301
Level 1 | Money market fund | Cash and Cash Equivalents
Debt Securities, Available-for-sale [Line Items]
Market Value	43,555	38,301
Level 1 | Money market fund | Short-term Investments and Marketable Securities
Debt Securities, Available-for-sale [Line Items]
Market Value	0	0
Level 1 | Money market fund | Long-term Investments
Debt Securities, Available-for-sale [Line Items]
Market Value	0	0
Level 1 | U.S. Treasuries
Debt Securities, Available-for-sale [Line Items]
Cost Basis	7,003
Unrealized Gains (Losses)	(3)
Market Value	7,000
Level 1 | U.S. Treasuries | Cash and Cash Equivalents
Debt Securities, Available-for-sale [Line Items]
Market Value	0
Level 1 | U.S. Treasuries | Short-term Investments and Marketable Securities
Debt Securities, Available-for-sale [Line Items]
Market Value	7,000
Level 1 | U.S. Treasuries | Long-term Investments
Debt Securities, Available-for-sale [Line Items]
Market Value	0
Level 1 | U.S. Treasury bonds
Debt Securities, Available-for-sale [Line Items]
Cost Basis		8,171
Unrealized Gains (Losses)		0
Market Value		8,171
Level 1 | U.S. Treasury bonds | Cash and Cash Equivalents
Debt Securities, Available-for-sale [Line Items]
Market Value		0
Level 1 | U.S. Treasury bonds | Short-term Investments and Marketable Securities
Debt Securities, Available-for-sale [Line Items]
Market Value		8,171
Level 1 | U.S. Treasury bonds | Long-term Investments
Debt Securities, Available-for-sale [Line Items]
Market Value		0
Level 2 | Commercial paper
Debt Securities, Available-for-sale [Line Items]
Cost Basis	23,110	23,312
Unrealized Gains (Losses)	0	0
Market Value	23,110	23,312
Level 2 | Commercial paper | Cash and Cash Equivalents
Debt Securities, Available-for-sale [Line Items]
Market Value	0	0
Level 2 | Commercial paper | Short-term Investments and Marketable Securities
Debt Securities, Available-for-sale [Line Items]
Market Value	23,110	23,312
Level 2 | Commercial paper | Long-term Investments
Debt Securities, Available-for-sale [Line Items]
Market Value	0	0
Level 2 | Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Cost Basis	26,148	20,107
Unrealized Gains (Losses)	(114)	(14)
Market Value	26,034	20,093
Level 2 | Corporate bonds | Cash and Cash Equivalents
Debt Securities, Available-for-sale [Line Items]
Market Value	0	0
Level 2 | Corporate bonds | Short-term Investments and Marketable Securities
Debt Securities, Available-for-sale [Line Items]
Market Value	17,850	8,049
Level 2 | Corporate bonds | Long-term Investments
Debt Securities, Available-for-sale [Line Items]
Market Value	8,184	12,044
Level 2 | Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Cost Basis	5,493	15,655
Unrealized Gains (Losses)	(15)	(8)
Market Value	5,478	15,647
Level 2 | Asset-backed securities | Cash and Cash Equivalents
Debt Securities, Available-for-sale [Line Items]
Market Value	0	0
Level 2 | Asset-backed securities | Short-term Investments and Marketable Securities
Debt Securities, Available-for-sale [Line Items]
Market Value	5,478	15,647
Level 2 | Asset-backed securities | Long-term Investments
Debt Securities, Available-for-sale [Line Items]
Market Value	$ 0	$ 0

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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-Publisher FASB
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