XML 19 R9.htm IDEA: XBRL DOCUMENT v3.10.0.1

Note 5 - Short-term Investments

9 Months Ended

Sep. 30, 2018

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):

		September 30, 2018
						Gross				Gross
		Amortized				Unrealized				Unrealized				Estimated
		Cost				Gains				Losses				Fair Value
U.S. treasury bills and government agency obligations		$	69,602			$	—			$	(4	)		$	69,598
U.S. corporate debt securities			67,084				—				(36	)			67,048
Foreign corporate debt securities			6,995				—				(2	)			6,993
U.S. commercial paper			55,261				—				—				55,261
Foreign commercial paper			111,966				—				—				111,966
Total		$	310,908			$	—			$	(42	)		$	310,866

		D ecember 31, 2017
						Gross				Gross
		Amortized				Unrealized				Unrealized				Estimated
		Cost				Gains				Losses				Fair Value
U.S. corporate debt securities		$	13,003			$	—			$	(10	)		$	12,993
U.S. commercial paper			4,929				—				—				4,929
Foreign commercial paper			9,874				—				—				9,874
Total		$	27,806			$	—			$	(10	)		$	27,796

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

and

nine

months ended

September 30, 2018

and

2017.

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

not

recognize any realized gains or losses during the

three

and

nine

months ended

September 30, 2018

and

2017.

X

- References

No definition available.

+ Details

Name:	us-gaap_DisclosureTextBlockAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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

+ Details

Name:	us-gaap_InvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration