Investments (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Cash and cash equivalents:
Amortized cost	$ 151,570	$ 143,940
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Fair value	151,570	143,940
Investments:
Amortized cost	88,846	165,342
Gross unrealized gains	8	0
Gross unrealized losses	(60)	(92)
Fair value	88,794	165,250
Total cash, cash equivalents and investments, amortized cost	240,416	309,282
Total cash, cash equivalents and investments, fair value	240,364	309,190
Cash and cash equivalents
Cash and cash equivalents:
Amortized cost	151,570	143,940
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Fair value	151,570	143,940
Commercial paper (due within 1 year)
Investments:
Amortized cost	44,122	64,629
Gross unrealized gains	5	0
Gross unrealized losses	(23)	(7)
Fair value	44,104	64,622
Corporate bonds (due within 1 year)
Investments:
Amortized cost	44,724	60,640
Gross unrealized gains	3	0
Gross unrealized losses	(37)	(76)
Fair value	$ 44,690	60,564
U.S. Government and government agencies (due within 1 year)
Investments:
Amortized cost		40,073
Gross unrealized gains		0
Gross unrealized losses		(9)
Fair value		$ 40,064

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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