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Note 4 - Balance Sheet Details - Available-for-sale Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Available-for-sale securities, amortized cost	$ 300,622	$ 27,806
Available-for-sale securities, gross unrealized gains	5
Available-for-sale securities, gross unrealized losses	(92)	(10)
Available-for-sale securities, current	300,535	27,796
US Treasury Securities [Member]
Available-for-sale securities, amortized cost	59,747
Available-for-sale securities, gross unrealized gains
Available-for-sale securities, gross unrealized losses	(6)
Available-for-sale securities, current	59,741
Debt Security, Corporate, US [Member]
Available-for-sale securities, amortized cost	59,164	13,003
Available-for-sale securities, gross unrealized gains
Available-for-sale securities, gross unrealized losses	(77)	(10)
Available-for-sale securities, current	59,087	12,993
United States Commercial Paper [Member]
Available-for-sale securities, amortized cost	52,800	4,929
Available-for-sale securities, gross unrealized losses
Available-for-sale securities, current	52,800	4,929
Debt Security, Corporate, Non-US [Member]
Available-for-sale securities, amortized cost	5,041
Available-for-sale securities, gross unrealized gains	5
Available-for-sale securities, gross unrealized losses
Available-for-sale securities, current	5,046
Foreign Commercial Paper [Member]
Available-for-sale securities, amortized cost	123,870	9,874
Available-for-sale securities, gross unrealized losses	(9)
Available-for-sale securities, current	$ 123,861	$ 9,874

X

- Definition

Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563

+ Details

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X

- Definition

Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

No definition available.

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- Definition

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+ References

No definition available.

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- Definition

Amount of investment in debt and equity securities categorized neither as trading securities nor held-to-maturity securities and intended be sold or mature one year or operating cycle, if longer.

+ References

No definition available.

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