Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Narrative (Details)

v3.3.0.814
Summary of Significant Accounting Policies - Narrative (Details)
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2015
performance_period
Sep. 30, 2015
USD ($)
customer
Sep. 30, 2014
USD ($)
customer
Sep. 30, 2015
USD ($)
customer
Sep. 30, 2014
USD ($)
customer
Dec. 31, 2014
customer
Concentration Risk [Line Items]            
Goodwill impairment | $       $ 0    
Advertising expense | $   $ 15,900,000 $ 3,900,000 $ 22,200,000 $ 6,200,000  
Revenue | Customer concentration risk            
Concentration Risk [Line Items]            
Number of major customers representing 10% or more of total revenue/total accounts receivable   0 0 0 0  
Accounts receivable | Customer concentration risk            
Concentration Risk [Line Items]            
Number of major customers representing 10% or more of total revenue/total accounts receivable       0   0
Market stock units            
Concentration Risk [Line Items]            
Number of performance periods | performance_period 3          
Minimum            
Concentration Risk [Line Items]            
Estimated useful lives of finite-lived intangible assets       2 years    
Maximum            
Concentration Risk [Line Items]            
Estimated useful lives of finite-lived intangible assets       4 years