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Provision for income taxes (Detail)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Tax at statutory rate (34.00%) (34.00%)
State taxes, net of federal benefit 0.00% 0.00%
Research and development credit 0.10% (2.60%)
Share based payment expense 0.90% 0.80%
Other 1.40% (1.80%)
Change in valuation allowance 14.30% 34.00%
Removal of deferred tax asset on federal net operating losses 26.90% 0.00%
Establishment of deferred tax asset on state net operating losses and state deferred taxes, net of federal income tax benefit (9.60%) 0.00%
Effective tax rate 0.00% 0.00%