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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
Preferred stock at December 31, 2017 consisted of the following:
 
Shares
 
 
 
 
Series
Authorized
 
Issued and
Outstanding
 
Carrying Value
 
Liquidation Value
 
 
 
 
 
(in thousands)
Series 1
245,096

 
245,096

 
$
154

 
$
154

Series 2
709,617

 
709,608

 
1,489

 
1,520

Series 3
498,958

 
498,938

 
2,862

 
2,874

Series 4
2,509,047

 
2,509,032

 
15,656

 
15,807

Series 5
2,086,138

 
2,009,226

 
18,127

 
18,275

Series 6
3,389,227

 
3,319,274

 
54,508

 
54,674

Series 7
2,666,666

 
2,580,404

 
25,752

 
25,890

Total
12,104,749

 
11,871,578

 
$
118,548

 
$
119,194