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Redeemable Convertible Preferred Stock (Tables)
12 Months Ended
Dec. 31, 2018
Temporary Equity Disclosure [Abstract]  
Schedule of Redeemable Convertible Preferred Stock
Redeemable convertible preferred stock as of December 31, 2017 consisted of the following (in thousands, except share data):
 
Shares
Authorized
 
Shares
Issued and
Outstanding
 
Net
Carrying Value
 
Aggregate
Liquidation
Preference
Series A-1
10,141,345

 
9,142,770

 
$
72,181

 
$
91,427

Series A-2
60,000,000

 
47,124,931

 
65,853

 
5

Series B-1
5,854,982

 
4,866,360

 
27,628

 
27,787

Series B-2
145,018

 
145,018

 
824

 
828

Total redeemable convertible preferred stock
76,141,345

 
61,279,079

 
$
166,486

 
$
120,047