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Investments - Available-for-sale Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Amortized Costs	$ 13,467	$ 48,735
Gross Unrealized Holding Gains	5	89
Gross Unrealized Holding Losses	0	(6)
Fair Value	13,472	48,818
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Costs	5,999	15,992
Gross Unrealized Holding Gains	0	2
Gross Unrealized Holding Losses	0	(3)
Fair Value	5,999	15,991
Corporate notes/bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Costs	6,212	29,227
Gross Unrealized Holding Gains	1	72
Gross Unrealized Holding Losses	0	(3)
Fair Value	6,213	29,296
U.S. Treasuries
Debt Securities, Available-for-sale [Line Items]
Amortized Costs		2,251
Gross Unrealized Holding Gains		2
Gross Unrealized Holding Losses		0
Fair Value		2,253
U.S. Government agency securities
Debt Securities, Available-for-sale [Line Items]
Amortized Costs	1,256	1,265
Gross Unrealized Holding Gains	4	13
Gross Unrealized Holding Losses	0	0
Fair Value	$ 1,260	$ 1,278

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- 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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