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Note 5 - Commitments and Contingencies (Details Textual) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) ft² | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Operating Leases, Rent Expense | $ | $ 3.1 | $ 2.1 | $ 1.5
Purchase Obligation | $ | 39.7 |  |
Unrecorded Unconditional Purchase Obligation | $ | $ 35.9 |  |
San Diego [Member] |  |  |
Area of Real Estate Property | ft² | 28,275 |  |
Lessee, Operating Lease, Renewal Term | 5 years |  |
Redwood City [Member] |  |  |
Area of Real Estate Property | ft² | 26,067 |  |
Jersey City [Member] |  |  |
Area of Real Estate Property | ft² | 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/2003/role/presentationRef -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 + Details
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- Definition Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier. + References No definition available. + Details
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- Definition Amount of the unrecorded obligation to transfer funds in the future for fixed or minimum amounts or quantities of goods or services at fixed or minimum prices (for example, as in take-or-pay contracts or throughput contracts). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77896938&loc=d3e25336-109308 + Details
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- Details
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- Details
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- Details
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