Investments (Tables)

9 Months Ended

Sep. 30, 2020

Investments, Debt and Equity Securities [Abstract]

Short-term investments available-for-sale

Our investments are classified as available-for-sale and consist of the following:

	September 30, 2020
			Unrealized
	Cost		Gains		Losses		Fair Value
Short-Term:
Commercial paper	$	13,264	$	—	$	—	$	13,264
Corporate bonds	6,580		—		(1)		6,579
U.S. government securities	36,015		74		—		36,089
Short-term investments	$	55,859	$	74	$	(1)	$	55,932

	December 31, 2019
			Unrealized
	Cost		Gains		Losses		Fair Value
Short-Term:
Commercial paper	$	14,214	$	—	$	—	$	14,214
Corporate bonds	26,194		16		(2)		26,208
Asset-backed securities	8,097		5		(1)		8,101
U.S. government securities	78,017		65		—		78,082
Short-term investments	$	126,522	$	86	$	(3)	$	126,605
Long-Term:
Corporate bonds	$	6,258	$	18	$	—	$	6,276
Long-term investments	$	6,258	$	18	$	—	$	6,276