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Note 5 - Short-term Investments - Summary of Short-term Investments (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Available-for-sale securities, amortized cost	$ 310,908	$ 27,806
Available-for-sale securities, gross unrealized gains
Available-for-sale securities, gross unrealized losses	(42)	(10)
Available-for-sale securities	310,866	27,796
US Treasury Securities [Member]
Available-for-sale securities, amortized cost	69,602
Available-for-sale securities, gross unrealized gains
Available-for-sale securities, gross unrealized losses	(4)
Available-for-sale securities	69,598
Debt Security, Corporate, US [Member]
Available-for-sale securities, amortized cost	67,084	13,003
Available-for-sale securities, gross unrealized gains
Available-for-sale securities, gross unrealized losses	(36)	(10)
Available-for-sale securities	67,048	12,993
United States Commercial Paper [Member]
Available-for-sale securities, amortized cost	55,261	4,929
Available-for-sale securities, gross unrealized gains
Available-for-sale securities, gross unrealized losses
Available-for-sale securities	55,261	4,929
Debt Security, Corporate, Non-US [Member]
Available-for-sale securities, amortized cost	6,995
Available-for-sale securities, gross unrealized gains
Available-for-sale securities, gross unrealized losses	(2)
Available-for-sale securities	6,993
Foreign Commercial Paper [Member]
Available-for-sale securities, amortized cost	111,966	9,874
Available-for-sale securities, gross unrealized gains
Available-for-sale securities, gross unrealized losses
Available-for-sale securities	$ 111,966	$ 9,874

X

- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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+ References

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