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Restructuring (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Net (loss) income |  | $ (7,805) | $ (3,177) | $ (3,916) | $ (1,989) | $ 1,284 | $ 4,256 | $ 2,111 | $ 1,129 | $ (16,887) | $ 8,780 | $ (5,845) |
Net (decrease) increase in cash and cash equivalents |  |  |  |  |  |  |  |  |  | (18,011) | 27,205 | 5,545 |
Cash and cash equivalents |  | $ 16,629 |  |  |  | $ 34,640 |  |  |  | $ 16,629 | $ 34,640 | $ 7,435 | $ 1,890
Scenario, forecast | Subsequent event |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring charges | $ 1,100 |  |  |  |  |  |  |  |  |  |  |  |

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