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Convertible Preferred Stock (Tables)
 12 Months Ended
Dec. 31, 2021
Temporary Equity Disclosure [Abstract]  
Schedule of Convertible Preferred Stock Authorized and Issued and its Principal Terms Convertible preferred stock authorized and issued and its principal terms as of December 31, 2019, consisted of the following (in thousands, except share and per share amounts):

 

 

 

As of December 31, 2019

 

 

 

Shares
Authorized

 

 

Shares
Issued and
Outstanding

 

 

Issue Period

 

Issue
Price per
Share

 

 

Dividend
Annual Rate
per Share

 

 

Aggregate
Liquidation
Preference

 

Series A

 

 

3,862,500

 

 

 

3,862,500

 

 

2014 - 2015

 

$

4.00

 

 

$

0.32

 

 

$

15,450

 

Series B

 

 

6,750,000

 

 

 

6,749,999

 

 

2015 - 2016

 

$

8.00

 

 

$

0.64

 

 

$

54,000

 

Series C

 

 

4,448,788

 

 

 

4,448,780

 

 

2018 - 2019

 

$

12.00

 

 

$

0.96

 

 

$

53,385

 

Series D

 

 

5,287,500

 

 

 

4,217,327

 

 

2019

 

$

13.20

 

 

$

1.056

 

 

$

55,669

 

Total

 

 

20,348,788

 

 

 

19,278,606