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Note 6 - Commitments and Contingencies (Details Textual) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($) ft²	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	May 31, 2018 ft²
Operating Leases, Rent Expense, Total | $	$ 3.2	$ 3.1	$ 2.1
San Diego [Member]
Area of Real Estate Property	28,275			23,873
Lessee, Operating Lease, Renewal Term	5 years
Redwood City [Member]
Area of Real Estate Property	26,067
Jersey City [Member]
Area of Real Estate Property	1,898

X

- Definition

Area of a real estate property.

+ References

No definition available.

+ Details

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X

- Definition

Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

+ References

No definition available.

+ Details

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X

- Definition

Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980

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- Details

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