v3.3.1.900

Income Taxes (Effective Tax Rates) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014
Effective tax rates differing from U.S. federal statutory rate |  |
U.S. Federal taxes (Benefit) at statutory rate | $ (24,375) | $ (1,747)
State tax expense | (2,428) | (294)
Research and development credits | (751) | (530)
Stock-based compensation | 1,683 | 755
Mark to market fair value adjustments | 504 | 566
Other nondeductible items | 841 | 414
Change in valuation allowance | $ 24,526 | 851
Provision for income taxes |  | $ 15
U.S. Federal taxes (Benefit) at statutory rate (as a percent) | (34.00%) | (34.00%)
State tax expense (as a percent) | (3.39%) | (5.72%)
Research and development credits (as a percent) | (1.05%) | (10.32%)
Stock-based compensation (as a percent) | 2.35% | 14.70%
Mark to market fair value adjustments (as a percent) | 0.70% | 11.01%
Other nondeductible items (as a percent) | 1.17% | 8.05%
Change in valuation allowance (as a percent) | 34.21% | 16.57%
Provision for income taxes (as a percent) |  | 0.29%
State income tax expense |  | $ 15

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