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Note 12 - Income Taxes (Details) - Components of Defered Tax Assets (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Components of Defered Tax Assets [Abstract]      
Net operating loss carryforwards $ 31,834 $ 13,900 $ 6,700
Research credits 4,792 2,300 2,100
Stock compensation expense 4,124 2,600 600
Other 487 400 900
Total deferred tax assets 41,237 19,200 10,300
Valuation allowance (41,237) (19,200) (10,300)
Net deferred tax assets $ 0 $ 0 $ 0