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Restructuring Charges - Additional Information (Details) $ in Thousands |  |  |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Oct. 20, 2015 Employee | Sep. 29, 2015 Employee | Aug. 21, 2015 Employee | Jan. 05, 2012 Position | Dec. 31, 2015 USD ($) | Sep. 30, 2015 USD ($) | Mar. 31, 2014 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  | $ 1,138 | $ 2,561 | $ 84 | $ 3,699 | $ 84 | $ 328
Total expenses on restructuring activities |  |  |  |  |  |  |  |  | 3,700 |  |
Payments for restructuring expenses |  |  |  |  |  |  |  |  | 3,200 |  |
Expected future payments for restructuring |  |  |  |  |  | $ 500 |  |  | 500 |  |
Contract Termination Costs [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  |  |  | 766 |  |
Facility Costs [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring charges | [1] |  |  |  |  |  |  |  |  | 84 |
2015 Restructuring [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of employees terminated | Employee |  | 9 | 5 | 38 |  |  |  |  |  |  |
2015 Restructuring [Member] | Severance, Other Termination Benefits and Outplacement Services [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  |  |  | 2,900 |  |
2015 Restructuring [Member] | Contract Termination Costs [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  |  |  | 800 |  |
2012 Restructuring [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of positions eliminated | Position |  |  |  |  | 84 |  |  |  |  |  |
Number of positions eliminated (in hundredths) |  |  |  |  | 34.00% |  |  |  |  |  |
2012 Restructuring [Member] | Facility Costs [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  |  |  | $ 0 | $ 100 | $ 300
[1] | Includes moving and relocation costs, and lease payments, net of sublease payments.

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