Investments by security type consisted of the following at March 31, 2020 and December 31, 2019:

	March 31, 2020
	Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss			Fair Value
Investments:
Commercial paper	$	11,466	$	—	$	—		$	11,466
Corporate bonds		8,781		—		(10	)		8,771
	$	20,247	$	—	$	(10	)	$	20,237

	December 31, 2019
	Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss			Fair Value
Investments:
Commercial Paper	$	11,957	$	—	$	—		$	11,957
Corporate Bonds		17,732		3		(2	)		17,733
	$	29,689	$	3	$	(2	)	$	29,690

Investments with original maturities of less than 90 days are included in cash and cash equivalents on the condensed consolidated balance sheets and are not included in the table above. Investments with maturities of less than 12 months are considered current and those investments with maturities greater than 12 months are considered non-current assets.

Excluded from the table above in a restricted investment of $1,400 as the cost approximates current fair value.