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Goodwill and Acquired Intangible Assets - Acquired Intangible Assets Subject to Amortization (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Finite Lived Intangible Assets [Line Items]    
Cost $ 15,800 $ 15,800
Accumulated Amortization (8,584) (7,628)
Foreign Currency Translation Adjustments (161) (222)
Net 7,055 7,950
Developed technology    
Finite Lived Intangible Assets [Line Items]    
Cost 14,000 14,000
Accumulated Amortization (7,433) (6,584)
Foreign Currency Translation Adjustments (122) (169)
Net $ 6,445 $ 7,247
Remaining Useful Life 2 years 9 months 18 days 2 years 10 months 24 days
Customer relationships    
Finite Lived Intangible Assets [Line Items]    
Cost $ 1,800 $ 1,800
Accumulated Amortization (1,151) (1,044)
Foreign Currency Translation Adjustments (39) (53)
Net $ 610 $ 703
Remaining Useful Life 2 years 1 month 6 days 2 years 3 months 2 days