Short-Term Investments

12 Months Ended

Dec. 31, 2020

Investments, Debt and Equity Securities [Abstract]

Short-Term Investments

Short-Term Investments

The following table represents the Company’s available for sale short-term investments by major security type (amounts in thousands):

	December 31, 2020
	Amortized Cost		Gross Unrealized Loss		Total Fair Value
Short-term investments:
U.S. government securities	$	177,614	$	(63)	$	177,551
Total short-term investments	$	177,614	$	(63)	$	177,551

	December 31, 2019
	Amortized Cost		Gross Unrealized Gain/(Loss)		Total Fair Value
Short-term investments:
Corporate securities	$	5,375	$	(17)	$	5,358
U.S. government securities	26,645		71		26,716
Total short-term investments	$	32,020	$	54	$	32,074

The Company’s short-term investment instruments and cash and cash equivalents are classified using Level 1 inputs in within the fair value hierarchy and are valued using quoted market prices, broker or dealer quotations, or alternative pricing

sources with reasonable levels of price transparency. Debt securities as of December 31, 2020 have an average maturity of 0.6 years.