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Debt - Convertible Notes (Details)
$ / shares in Units, $ in Thousands
May 19, 2020
USD ($)
item
Jun. 30, 2020
USD ($)
$ / shares
Dec. 31, 2019
$ / shares
Jul. 31, 2017
Debt Instrument [Line Items]        
Aggregate principal amount $ 143,800      
Interest rate       4.35%
Fair value of our convertible notes $ 194,400      
Convertible Notes        
Debt Instrument [Line Items]        
Aggregate principal amount   $ 143,750    
Amount issued   87,540    
Interest rate 4.00%      
Carrying amount of the equity component representing the conversion option   $ 43,116    
Class A common stock        
Debt Instrument [Line Items]        
Common stock par value (in dollars per share) | $ / shares   $ 0.001 $ 0.001  
Class A common stock | Convertible Notes | Maximum        
Debt Instrument [Line Items]        
Aggregate principal amount $ 143,800      
Net proceeds from the debt $ 137,900      
Interest rate 4.00%      
Conversion ratio 33.7268      
Denomination for conversion of debt $ 1      
Premium percentage on conversion price 130.00%      
Threshold trading days | item 20      
Threshold consecutive trading days | item 30      
Discount rate (as a percent) 13.00%      
Carrying amount of the equity component representing the conversion option $ 53,300      
Fair value of our convertible notes   $ 194,400