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Short-Term Investments (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) instrument	Dec. 31, 2019 USD ($) instrument
Short-Term Investments
Amortized Cost	$ 20,000	$ 26,345
Fair Value	$ 20,000	$ 26,345
Number of short term investments in unrealized loss position | instrument	0	4
Number of short term investments in an unrealized loss position more than 12 months | instrument		0
Aggregate fair value of the investments in an unrealized loss position		$ 3,400
Commercial paper
Short-Term Investments
Amortized Cost		1,993
Fair Value		1,993
Corporate debt securities
Short-Term Investments
Amortized Cost		3,352
Fair Value		3,352
Reverse repurchase agreements
Short-Term Investments
Amortized Cost	$ 20,000	21,000
Fair Value	$ 20,000	$ 21,000

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- Definition

The amount of short-term investments at amortized cost.

+ References

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This item represents the aggregate fair value of short term investments, that have been in a continuous unrealized loss position for less than twelve months.

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- Definition

Number of short term investment positions that have been in a continuous unrealized loss position for greater than or equal to a year for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement.

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Number of Short term investment positions in a continuous unrealized loss position for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement.

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Amount of investments including trading securities, available-for-sale securities, held-to-maturity securities, and short-term investments classified as other and current.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(4))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
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-Subparagraph (SX 210.7-03(a)(1)(g))
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-Subparagraph (SX 210.5-02(2))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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