Investments (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Cash and cash equivalents:
Amortized cost	$ 143,940	$ 202,818
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Fair value	143,940	202,818
Investments:
Amortized cost	165,342
Gross unrealized gains	0
Gross unrealized losses	(92)
Fair value	165,250
Total cash, cash equivalents and investments, amortized cost	309,282
Total cash, cash equivalents and investments, fair value	309,190
Cash and cash equivalents
Cash and cash equivalents:
Amortized cost	143,940	202,818
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Fair value	143,940	$ 202,818
Commercial paper (due within 1 year)
Investments:
Amortized cost	64,629
Gross unrealized gains	0
Gross unrealized losses	(7)
Fair value	64,622
Corporate bonds (due within 1 year)
Investments:
Amortized cost	60,640
Gross unrealized gains	0
Gross unrealized losses	(76)
Fair value	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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