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Restructuring - Additional Information (Detail) $ / qtr in Millions, $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
May 06, 2014 $ / qtr | Mar. 31, 2017 USD ($) $ / qtr | Dec. 31, 2016 USD ($) $ / qtr | Jun. 30, 2014 USD ($) | Sep. 30, 2013 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
2016 Restructuring [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Reductions in company's worldwide workforce |  |  | 30.00% |  |  |  |
Reduction of overall cost structure | $ / qtr |  |  | 2.5 |  |  |  |
Special charges for restructuring plan |  |  | $ 0.3 |  |  |  |
2016 Restructuring [Member] | Scenario Forecast [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Reductions in company's worldwide workforce |  | 16.00% |  |  |  |  |
Special charges for restructuring plan |  | $ 0.3 |  |  |  |  |
Non-cash stock based compensation expense |  | $ 0.1 |  |  |  |  |
2016 Restructuring [Member] | Minimum [Member] | Scenario Forecast [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Reduction of overall cost structure | $ / qtr |  | 0.9 |  |  |  |  |
2016 Restructuring [Member] | Maximum [Member] | Scenario Forecast [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Reduction of overall cost structure | $ / qtr |  | 1.0 |  |  |  |  |
2014 Restructuring [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Reductions in company's worldwide workforce | 20.00% |  |  |  |  |  |
Reduction of overall cost structure | $ / qtr | 2.0 |  |  |  |  |  |
Special charges for restructuring plan |  |  |  | $ 1.8 |  |  |
Non-cash stock based compensation expense |  |  |  | 1.3 |  |  |
Severance costs for affected employees |  |  |  | 0.4 |  |  |
Other restructuring related costs |  |  |  | $ 0.1 |  |  |
2013 Restructuring [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Reductions in company's worldwide workforce |  |  |  |  | 26.00% |  |
Special charges for restructuring plan |  |  |  |  |  |  | $ 5.6
Severance costs for affected employees |  |  |  |  |  |  | 1.1
Other restructuring related costs |  |  |  |  |  |  | 0.2
Annualized savings |  |  |  |  | $ 16.0 |  |
Lease/rental termination charges for restructuring |  |  |  |  |  | $ 0.8 | 3.3
Equipment and improvements write-offs due to lease/rental terminations |  |  |  |  |  | $ 0.6 | $ 1.0

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