Organization and Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Amortized cost	$ 29,964	$ 26,405
Gross unrealized gains	4	15
Gross unrealized losses	(1)	(6)
Fair value	29,967	26,414
Commercial Paper
Amortized cost	3,274	6,912
Gross unrealized gains	0	0
Gross unrealized losses	(1)	(1)
Fair value	3,273	6,911
Corporate Notes and Bonds
Amortized cost	9,423	7,922
Gross unrealized gains	4	15
Gross unrealized losses	0	(4)
Fair value	9,427	7,933
U.S. Government Treasury
Amortized cost	4,599
Gross unrealized gains	0
Gross unrealized losses	0
Fair value	4,599
U.S. Government Agency Securities
Amortized cost		2,145
Gross unrealized gains		0
Gross unrealized losses		(1)
Fair value		2,144
Short-term Investments
Amortized cost	16,438	16,318
Gross unrealized gains	4	15
Gross unrealized losses	(1)	(6)
Fair value	16,441	16,327
Cash
Amortized cost	10,918	7,814
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Fair value	10,918	7,814
Money Market Funds
Amortized cost	1,258	1,137
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Fair value	1,258	1,137
Certificates of Deposit
Amortized cost	492	475
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Fair value	492	475
Cash and Cash Equivalents
Amortized cost	13,526	10,087
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Fair value	$ 13,526	$ 10,087

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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- Definition

Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563

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+ References

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