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Investments Available-for-sale Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Amortized costs	$ 68,241	$ 64,851
Gross unrealized holding gains	342	2
Gross unrealized holding losses	(4)	(29)
Fair value	68,579	64,824
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized costs	15,166	13,932
Gross unrealized holding gains	22	1
Gross unrealized holding losses	0	(2)
Fair value	15,188	13,931
Corporate notes/bonds
Debt Securities, Available-for-sale [Line Items]
Amortized costs	44,798	36,620
Gross unrealized holding gains	271	1
Gross unrealized holding losses	(4)	(24)
Fair value	45,065	36,597
U.S. Treasuries
Debt Securities, Available-for-sale [Line Items]
Amortized costs	2,257	4,513
Gross unrealized holding gains	18	0
Gross unrealized holding losses	0	(1)
Fair value	2,275	4,512
U.S. Government agency securities
Debt Securities, Available-for-sale [Line Items]
Amortized costs	6,020	9,786
Gross unrealized holding gains	31	0
Gross unrealized holding losses	0	(2)
Fair value	$ 6,051	$ 9,784

X

- Definition

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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