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Income Taxes (Details Textual) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2015 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Operating Loss Carryforwards [Line Items] |  |  |  |
Unrecognized tax benefits that would impact effective tax rate |  | $ 33,500 |  |
Valuation allowance, change in amount | $ 27,481 | 230,700 | $ 9,800 | $ 5,400
Liability for uncertain tax positions |  | 29 | 32 |
Realization Of Excess Tax Benefits From Share Based Compensation |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Deferred tax assets not recognized related to share-based compensation |  | 11,500 | 8,100 |
Valuation allowance, change in amount |  | (4,200) |  |
Other Comprehensive Income (Loss) [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Valuation allowance, change in amount |  | 0 | (700) | (1,000)
Allocated to Equity |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Valuation allowance, change in amount |  | 0 | $ (1,100) | $ 0
Research Tax Credit Carryforward |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Tax credit carryforward |  | 10,600 |  |
California and New Jersey Research Tax Credit Carryforward |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Tax credit carryforward |  | 14,100 |  |
Internal Revenue Service (IRS) |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Operating loss carryforward |  | 537,100 |  |
State and Local Jurisdiction |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Operating loss carryforward |  | $ 138,400 |  |

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