v3.10.0.1
Stockholders' Equity - Summary of RSU and RSA Award Activity (Details) - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Restricted Stock Units    
Outstanding Restricted Stock    
Outstanding Restricted Stock, Vested (22,400) (34,400)
Weighted-Average Grant Date Fair Value per Restricted Stock    
Weighted-Average Grant Date Fair Value per Restricted Stock, Unvested Beginning Balance $ 15.90  
Weighted-Average Grant Date Fair Value per Restricted Stock, Granted 11.30  
Weighted-Average Grant Date Fair Value per Restricted Stock, Vested 15.50  
Weighted-Average Grant Date Fair Value per Restricted Stock, Forfeited $ 15.92  
Weighted-Average Grant Date Fair Value per Restricted Stock, Unvested Ending Balance   $ 15.90
Restricted Stock Units | Class A Common Stock    
Outstanding Restricted Stock    
Outstanding Restricted Stock, Unvested Beginning Balance 154,728  
Outstanding Restricted Stock, Granted 88,174  
Outstanding Restricted Stock, Vested (50,701)  
Outstanding Restricted Stock, Forfeited (42,563)  
Outstanding Restricted Stock, Unvested Ending Balance 149,638 154,728
Restricted Stock Units | Class B Common Stock    
Outstanding Restricted Stock    
Outstanding Restricted Stock, Unvested Beginning Balance 7,791  
Outstanding Restricted Stock, Vested (6,331)  
Outstanding Restricted Stock, Forfeited (968)  
Outstanding Restricted Stock, Unvested Ending Balance 492 7,791
Restricted Stock Awards    
Weighted-Average Grant Date Fair Value per Restricted Stock    
Weighted-Average Grant Date Fair Value per Restricted Stock, Unvested Beginning Balance $ 14.89  
Weighted-Average Grant Date Fair Value per Restricted Stock, Granted 6.69  
Weighted-Average Grant Date Fair Value per Restricted Stock, Vested 14.89  
Weighted-Average Grant Date Fair Value per Restricted Stock, Forfeited $ 14.94  
Weighted-Average Grant Date Fair Value per Restricted Stock, Unvested Ending Balance   $ 14.89
Restricted Stock Awards | Class A Common Stock    
Outstanding Restricted Stock    
Outstanding Restricted Stock, Unvested Beginning Balance 1,277  
Outstanding Restricted Stock, Granted 7,317  
Outstanding Restricted Stock, Vested (421)  
Outstanding Restricted Stock, Forfeited (39)  
Outstanding Restricted Stock, Unvested Ending Balance 8,134 1,277