Fair Value of Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2020

Fair Value of Financial Instruments [Abstract]

Fair Value of Financial Instruments Measured on Recurring Basis

Items measured at fair value on a recurring basis are the Company’s investments. The following table sets forth the Company’s financial instruments that were measured at fair value on a recurring basis by level within the fair value hierarchy:

	Fair Value Measurements as of December 31, 2020 Using:
	Level 1		Level 2		Level 3		Total
Assets:
Cash and cash equivalents:
Money market mutual funds	$	193,312	$	-	$	-	$	193,312
United States Treasury securities		62,497		-		-		62,497
Corporate Bonds		-		501		-		501
Agency Bonds		-		8,015		-		8,015
		255,809		8,516		-		264,325
Investments:
United States Treasury securities		112,328		-		-		112,328
Corporate Bonds		-		63,710		-		63,710
Municipal Bonds		-		6,000		-		6,000
Agency Bonds		-		3,583		-		3,583
		112,328		73,293		-		185,621
	$	368,137	$	81,809	$	-	$	449,946

	Fair Value Measurements as of December 31, 2019 Using:
	Level 1		Level 2		Level 3		Total
Assets:
Cash and cash equivalents:
Money market mutual funds	$	72,114	$	-	$	-	$	72,114
Cash		7,542		-		-		7,542
		79,656		-		-		79,656
Investments:
United States Treasury securities		75,464		-		-		75,464
Government Bonds		-		8,000		-		8,000
Corporate Bonds		-		29,268		-		29,268
Municipal Bonds		-		6,000		-		6,000
		75,464		43,268		-		118,732
	$	155,120	$	43,268	$	-	$	198,388