v3.6.0.2

Income Taxes - Effective Tax Rates (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Dec. 31, 2016 | Dec. 31, 2015
Effective tax rates differing from U.S. federal statutory rate |  |  |  |
U.S. Federal taxes (Benefit) at statutory rate |  |  | $ (32,277,000) | $ (24,375,000)
State tax expense |  |  | (2,842,000) | (2,428,000)
Research and development credits |  |  | (1,449,000) | (751,000)
Stock-based compensation |  |  | 1,275,000 | 1,683,000
Mark to market fair value adjustments |  |  | 49,000 | 504,000
Other nondeductible items |  |  | 933,000 | 841,000
Change in valuation allowance |  |  | 34,453,000 | $ 24,526,000
Provision for income taxes | $ 39,000 | $ 103,000 | $ 142,000 |
U.S. Federal taxes (Benefit) at statutory rate (as a percent) |  |  | (34.00%) | (34.00%)
State tax expense (as a percent) |  |  | (2.99%) | (3.39%)
Research and development credits (as a percent) |  |  | (1.53%) | (1.05%)
Stock-based compensation (as a percent) |  |  | 1.34% | 2.35%
Mark to market fair value adjustments (as a percent) |  |  | 0.05% | 0.70%
Other nondeductible items (as a percent) |  |  | 0.99% | 1.17%
Change in valuation allowance (as a percent) |  |  | 36.29% | 34.21%
Provision for income taxes (as a percent) |  |  | 0.15% |
Foreign withholding tax |  |  | $ 142,000 |

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