Other Balance Sheet Items - Severance Costs (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Restructuring Cost and Reserve [Line Items]
Severance costs		$ 2,200
Scenario, Forecast
Restructuring Cost and Reserve [Line Items]
Severance costs	$ 200
Product Development
Restructuring Cost and Reserve [Line Items]
Severance costs		1,100
Service Costs
Restructuring Cost and Reserve [Line Items]
Severance costs		600
General and Administrative
Restructuring Cost and Reserve [Line Items]
Severance costs		400
Sales and Marketing
Restructuring Cost and Reserve [Line Items]
Severance costs		100
Severance
Restructuring Cost and Reserve [Line Items]
Accrued expense		485
Severance | Accrued expenses and other current liabilities
Restructuring Cost and Reserve [Line Items]
Accrued expense		$ 500