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Note 5 - Short-term Investments - Summary of Short-term Investments (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Available-for-sale securities, amortized cost	$ 164,055	$ 27,806
Available-for-sale securities, gross unrealized gains	3
Available-for-sale securities, gross unrealized losses	(28)	(10)
Available-for-sale securities	164,030	27,796
US Treasury Securities [Member]
Available-for-sale securities, amortized cost	39,768
Available-for-sale securities, gross unrealized gains	3
Available-for-sale securities, gross unrealized losses
Available-for-sale securities	39,771
Debt Security, Corporate, US [Member]
Available-for-sale securities, amortized cost	19,176	13,003
Available-for-sale securities, gross unrealized gains
Available-for-sale securities, gross unrealized losses	(23)	(10)
Available-for-sale securities	19,153	12,993
United States Commercial Paper [Member]
Available-for-sale securities, amortized cost	52,794	4,929
Available-for-sale securities, gross unrealized gains
Available-for-sale securities, gross unrealized losses
Available-for-sale securities	52,794	4,929
Foreign Commercial Paper [Member]
Available-for-sale securities, amortized cost	52,317	9,874
Available-for-sale securities, gross unrealized gains
Available-for-sale securities, gross unrealized losses	(5)
Available-for-sale securities	$ 52,312	$ 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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