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Marketable Securities (Tables)

3 Months Ended

Mar. 31, 2019

Investments, Debt and Equity Securities [Abstract]

Fair value of marketable securities, by type

The following table summarizes the fair value of our marketable securities, by level within the fair value hierarchy, as of each period end:

			March 31, 2019																														December 31, 2018
			Level 1						Level 2						Total						Level 1						Level 2						Total
U.S. Treasury notes and bonds			$	5,088,386					$	—					$	5,088,386					$	5,034,955					$	—					$	5,034,955
Corporate bonds			—						—						—						—						2,504,551						2,504,551
Commercial paper									2,256,191						2,256,191						—						—						—
Short-term cash investments			—						2,322,496						2,322,496						—						751,173						751,173
Total fair value of marketable securities			$	5,088,386					$	4,578,687					$	9,667,073					$	5,034,955					$	3,255,724					$	8,290,679

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- Definition

Tabular disclosure of assets measured at fair value measured on a recurring or nonrecurring basis. Includes, but is not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19190-110258

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X

- References

No definition available.

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