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Commitments and Contingencies - Employee Contracts and Severance Costs (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2016
Employee Severance [Roll Forward]    
Beginning balance   $ 2,803,000
Severance Costs $ 0 1,783,000
Cash Payments   (3,727,000)
Ending balance $ 859,000 $ 859,000
Employment contracts    
Restructuring Cost and Reserve [Line Items]    
Maximum term of executive's annual base salary to determine severance obligations   12 months
Technology and development    
Employee Severance [Roll Forward]    
Severance Costs   $ 1,300,000
Sales and marketing    
Employee Severance [Roll Forward]    
Severance Costs   $ 500,000