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Summary of Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2018

Summary of Significant Accounting Policies [Abstract]

Cash and Available-for-Sale Securities Adjusted Cost, Gross Unrealized Gains, Gross Unrealized Losses and Fair Value by Significant Investment Category

The following tables show the adjusted cost, gross unrealized gains, gross unrealized losses and fair value of our securities by significant investment category as of March 31, 2018 and December 31, 2017.

		March 31, 2018
		Adjusted Cost				Unrealized Gains				Unrealized Losses				Fair Value				Cash and Cash Equivalents				Investments Available for Sale
Cash		$	3,501			$	—			$	—			$	3,501			$	3,501			$	—
Level 1:
Mutual funds			1,177				—				—				1,177				1,177				—
U.S. government securities			80				—				—				80				—				80
U.S. agency securities			1,369				—				—				1,369				866				503
			2,626				—				—				2,626				2,043				583
Total		$	6,127			$	—			$	—			$	6,127			$	5,544			$	583

		December 31, 2017
		Adjusted Cost				Unrealized Gains				Unrealized Losses				Fair Value				Cash and Cash Equivalents				Investments Available for Sale
Cash		$	1,972			$	—			$	—			$	1,972			$	1,972			$	—
Level 1:
Mutual funds			616				—				—				616				616
U.S. agency securities			2,001				—				(1	)			2,000				547				1,453
			2,617				—				(1	)			2,616				1,163				1,453
Total		$	4,589			$	—			$	(1	)		$	4,588			$	3,135			$	1,453

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- References

No definition available.

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- Definition

Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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