Investments (Tables)

9 Months Ended

Sep. 30, 2019

Investments Debt And Equity Securities [Abstract]

Schedule of Fair Value of Available-for-Sale Investments by Type of Security

As of September 30, 2019 the fair value of available-for-sale investments by type of security was as follows:

	September 30, 2019
	Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss		Fair Value
Investments:
Commercial paper	$	17,920	$	—	$	—	$	17,920
Corporate bonds		15,023		6		—		15,029
Government securities		545		—		—		545
Treasury bonds		997		1		—		998
	$	34,485	$	7	$	—	$	34,492