v3.3.1.900

Income Taxes (Deferred Tax Assets) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Income Taxes |  |  |
Valuation allowance increase | $ 24,500 | $ 900 | $ 10,800
Deferred tax assets |  |  |
Net operating loss carryforwards | 41,451 | 21,587 |
Research and development tax credit carryforwards | 4,794 | 2,696 |
Reserves and accruals | 3,108 | 1,717 |
Stock based compensation | 2,206 | 1,505 |
Total deferred tax assets before valuation allowance | 51,559 | 27,505 |
Less: valuation allowance | (51,153) | (26,627) |
Deferred tax assets, net | 406 | 878 |
Deferred tax liabilities |  |  |
Property and equipment | $ (406) | $ (878) |

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