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Income Taxes - Additional Information (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Operating Loss Carryforwards [Line Items] |  |  |
Income tax provision | $ 0 | $ 0 | $ 0
Percentage of valuation allowance against deferred tax assets | 100.00% |  |
Valuation allowance | $ 2,649,000 | 886,000 | $ 7,683,000
Tax benefit related to the exercise of non qualified stock options | 1,000,000 |  |
Federal [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating loss carryforwards | 184,500,000 | 171,600,000 |
Operating loss carryforwards, amount subject to limitations | 8,600,000 |  |
Operating loss carryforwards, annual limitation | 123,000 |  |
Operating loss carryforwards, net of limitations | $ 175,900,000 |  |
State and City [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating loss carryforwards, expiration dates | 2035 |  |
Foreign [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating loss carryforwards | $ 22,100,000 | 21,800,000 |
Federal Research and Development Tax Credit Carryforwards [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Tax credit carryforwards | $ 3,800,000 | 3,600,000 |
Tax credit carryforwards, expiration dates | 2035 |  |
Minimum [Member] | State and City [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating loss carryforwards | $ 27,300,000 | 110,500,000 |
Maximum [Member] | State and City [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating loss carryforwards | $ 109,700,000 | $ 276,300,000 |

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