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Note 5 - Short-term Investments

3 Months Ended

Mar. 31, 2019

Notes to Financial Statements

Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block]

5.

Short-Term Investments

The following is a summary of our short-term investments (in thousands):

		March 31, 2019
						Gross				Gross
		Amortized				Unrealized				Unrealized				Estimated
		Cost				Gains				Losses				Fair Value
U.S. treasury bills and government agency obligations		$	89,255			$	28			$	—			$	89,283
U.S. corporate debt securities			51,311				—				(1	)			51,310
Foreign corporate debt securities			5,027				11				—				5,038
U.S. commercial paper			50,176				—				—				50,176
Foreign commercial paper			69,972				—				(2	)			69,970
Total		$	265,741			$	39			$	(3	)		$	265,777

		December 31, 2018
						Gross				Gross
		Amortized				Unrealized				Unrealized				Estimated
		Cost				Gains				Losses				Fair Value
U.S. treasury bills and government agency obligations		$	59,747			$	—			$	(6	)		$	59,741
U.S. corporate debt securities			59,164				—				(77	)			59,087
Foreign corporate debt securities			5,041				5				—				5,046
U.S. commercial paper			52,800				—				—				52,800
Foreign commercial paper			123,870				—				(9	)			123,861
Total		$	300,622			$	5			$	(92	)		$	300,535

The amortized cost of debt securities is adjusted for amortization of premiums and accretion of discounts to maturity. We regularly monitor and evaluate the realizable value of our marketable securities. We did

not

recognize any impairment losses during the

three

months ended

March 31, 2019

and

2018.

Realized gains and losses associated with our investments, if any, are reported in the statements of operations and comprehensive loss. We recognized

$8,000

in realized gains during the

three

months ended

March 31, 2019.

We did

not

recognize any realized gains or losses during the

three

months ended

March 31, 2018.

X

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No definition available.

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- Definition

The entire disclosure for investments in certain debt and equity securities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 320
-URI http://asc.fasb.org/subtopic&trid=2209399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-URI http://asc.fasb.org/subtopic&trid=2324412

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-URI http://asc.fasb.org/topic&trid=2196928

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 940
-SubTopic 320
-URI http://asc.fasb.org/subtopic&trid=2176304

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