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Note 4 - Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2019

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
		March 31,				Assets				Inputs				Inputs
		201 9				(Level 1)				(Level 2)				(Level 3)
Cash and money market funds		$	23,461			$	23,461			$	—			$	—
U.S. treasury bills and government agency obligations			89,283				89,283				—				—
U.S. corporate debt securities			51,310				—				51,310				—
Foreign corporate debt securities			5,038				—				5,038				—
U.S. commercial paper			50,176				—				50,176				—
Foreign commercial paper			69,970				—				69,970				—
Total		$	289,238			$	112,744			$	176,494			$	—

						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 8				(Level 1)				(Level 2)				(Level 3)
Cash and money market funds		$	22,751			$	22,751			$	—			$	—
U.S. treasury bills and government agency obligations			59,741				59,741				—				—
U.S. corporate debt securities			59,087				—				59,087				—
Foreign corporate debt securities			5,046				—				5,046				—
U.S. commercial paper			61,885				—				61,885				—
Foreign commercial paper			123,861				—				123,861				—
Total		$	332,371			$	82,492			$	249,879			$	—

X

- 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://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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X

- References

No definition available.

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