CASH EQUIVALENTS AND INVESTMENTS (Tables)

9 Months Ended

12 Months Ended

Sep. 30, 2021

Dec. 31, 2020

Investments, Debt and Equity Securities [Abstract]

The following tables show the Company’s cash equivalents and available-for-sale securities’ amortized cost, gross unrealized gains, gross unrealized losses and fair value by significant investment category

The following tables show the Company’s cash equivalents and available-for-sale securities’ amortized cost, gross unrealized gains, gross unrealized losses and fair value by significant investment category recorded as cash and cash equivalents or short- and long-term investments as of September 30, 2021 and December 31, 2020:

September 30, 2021
	Amortized Cost		Gross Unrealized ‎Gains		Gross Unrealized ‎Losses		Fair Value		Cash Equivalents		Short-Term ‎Investments		Long-Term ‎Investments
Cash equivalents:
Money Market funds	$	33,138,000	$	—	$	—	$	33,138,000	$	33,138,000	$	—	$	—
Subtotal		33,138,000		—		—		33,138,000		33,138,000		—		—
Investments:
Corporate Notes/Bonds		5,653,000		3,000		(1,000)		5,655,000		—		2,861,000		2,794,000
Convertible Debt		250,000		—		—		250,000		—		—		250,000
Subtotal		5,903,000		3,000		(1,000)		5,905,000		—		2,861,000		3,044,000
Total	$	39,041,000	$	3,000	$	(1,000)	$	39,043,000	$	33,138,000	$	2,861,000	$	3,044,000

December 31, 2020
	Amortized Cost		Gross Unrealized ‎Gains		Gross Unrealized ‎Losses		Fair Value		Cash Equivalents		Short-Term ‎Investments		Long-Term ‎Investments
Cash equivalents:
Money Market funds	$	9,424,000	$	—	$	—	$	9,424,000	$	9,424,000	$	—	$	—
Subtotal		9,424,000		—		—		9,424,000		9,424,000		—		—
Investments:
Commercial Paper		700,000		—		—		700,000		—		700,000		—
Corporate Notes/Bonds		7,658,000		7,000		(1,000)		7,664,000		—		2,059,000		5,605,000
Convertible Debt		605,000		—		—		605,000		—		—		605,000
Subtotal		8,963,000		7,000		(1,000)		8,969,000		—		2,759,000		6,210,000
Total	$	18,387,000	$	7,000	$	(1,000)	$	18,393,000	$	9,424,000	$	2,759,000	$	6,210,000

The following tables show the Company’s cash equivalents and available-for-sale securities’ amortized cost, gross unrealized gains, gross unrealized losses and fair value by significant investment category recorded as cash equivalents or short and long-term investments as of December 31, 2020 and December 31, 2019:

December 31, 2020

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value		Cash Equivalents		Short-Term Investments		Long-Term Investments
Cash equivalents:
Money Market funds	$	9,424,000	$	—	$	—		$	9,424,000	$	9,424,000	$	—	$	—
Subtotal		9,424,000		—		—			9,424,000		9,424,000		—		—
Investments:
Commercial Paper		700,000		—		—			700,000		—		700,000		—
Corporate Notes/Bonds		7,658,000		7,000		(1,000	)		7,664,000		—		2,059,000		5,605,000
Convertible Debt		605,000		—		—			605,000		—		—		605,000
Subtotal		8,963,000		7,000		(1,000	)		8,969,000		—		2,759,000		6,210,000
Total	$	18,387,000	$	7,000	$	(1,000	)	$	18,393,000	$	9,424,000	$	2,759,000	$	6,210,000

December 31, 2019
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value		Cash Equivalents		Short-Term Investments		Long-Term Investments
Cash equivalents:
Money Market funds	$	8,761,000	$	—	$	—		$	8,761,000	$	8,761,000	$	—	$	—
Subtotal		8,761,000		—		—			8,761,000		8,761,000		—		—
Investments:
Commercial Paper		8,695,000		—		(1,000	)		8,694,000		—		8,694,000		—
Corporate Notes/Bonds		756,000		—		—			756,000		—		756,000		—
Convertible Debt		250,000		—		—			250,000		—		—		250,000
Subtotal		9,701,000		—		(1,000	)		9,700,000		—		9,450,000		250,000
Total	$	18,462,000	$	—	$	(1,000	)	$	18,461,000	$	8,761,000	$	9,450,000	$	250,000

The following table summarizes the estimated fair value of our investments, designated as available-for-sale and classified by the contractual maturity date

The following table summarizes the estimated fair value of our investments, designated as available-for-sale and classified by the contractual maturity date of the securities as of September 30, 2021:
‎

	Amortized Cost		Estimated Market ‎Value
Due within one year	$	2,860,000	$	2,861,000
Due after one year through five years		3,043,000		3,044,000
	$	5,903,000	$	5,905,000

The following table summarizes the estimated fair value of our investments, designated as available-for-sale and classified by the contractual maturity date of the securities as of December 31, 2020:

	Amortized Cost		Estimated Market Value
Due within one year	$	2,759,000	$	2,759,000
Due after one year through five years		6,204,000		6,210,000
	$	8,963,000	$	8,969,000