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Note 4 - Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2018

Notes Tables

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

					Fair Value Measurements at Reporting Date Using
						Quoted Prices in				Significant
						Active Markets				Other				Significant
		Balance at				for Identical				Observable				Unobservable
		June 30 ,				Assets				Inputs				Inputs
		201 8				(Level 1)				(Level 2)				(Level 3)
Money market funds		$	237,705			$	237,705			$	—			$	—
U.S. treasury bills			39,771				39,771				—				—
U.S. corporate debt securities			19,153				—				19,153				—
U.S. commercial paper			59,788				—				59,788				—
Foreign commercial paper			63,304				—				63,304				—
Total		$	419,721			$	277,476			$	142,245			$	—

					Fair Value Measurements at Reporting Date Using
						Quoted Prices in				Significant
						Active Markets				Other				Significant
		Balance at				for Identical				Observable				Unobservable
		December 31,				Assets				Inputs				Inputs
		201 7				(Level 1)				(Level 2)				(Level 3)
Money market funds		$	91,386			$	91,386			$	—			$	—
U.S. corporate debt securities			17,520				—				17,520				—
U.S. commercial paper			39,863				—				39,863				—
Foreign commercial paper			19,854				—				19,854				—
Total		$	168,623			$	91,386			$	77,237			$	—

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- Definition

Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, 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://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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- References

No definition available.

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