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Income Taxes (Provision for income taxes) (Detail)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Tax at statutory rate (34.00%) (34.00%)
State taxes, net of federal benefit 0.00% 0.00%
Research and development credit (1.30%) (1.40%)
Share based payment expense 1.60% 1.80%
Other 0.70% 1.50%
Removal of deferred tax asset on federal net operating losses 0.00% 0.00%
Establishment of deferred tax asset on state net operating losses and state deferred taxes, net of federal income tax benefits (4.90%) (3.80%)
Change in valuation allowance 37.90% 36.00%
Effective tax rate 0.00% 0.00%