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Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2022
Fair Value Disclosures [Abstract]  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

The following tables summarize the Company's financial liabilities measured at fair value on a recurring basis as of March 31, 2022 and December 31, 2021 (in thousands):

 

           

Fair Value Measurements

 
           

as of March 31, 2022

 
   

Carrying Amount as of

   

 

   

 

   

 

 
   

March 31, 2022

    Level 1     Level 2     Level 3  

Preferred stock derivative liability

  $ 21,927     $     $     $ 21,927  

 

           

Fair Value Measurements

 
           

as of December 31, 2021

 
   

Carrying Amount as of

   

 

   

 

   

 

 
   

December 31, 2021

    Level 1     Level 2     Level 3  

Preferred stock derivative liability

  $ 21,282     $     $     $ 21,282  

 

Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]

The following tables provide a reconciliation of the beginning and ending balances of liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) (in thousands):

 

3.25% convertible senior notes due in 2023

 

2022

   

2021

 

Balance, January 1,

  $     $ 34,134  

Conversion of convertible senior notes

          (5,631 )

Change in fair value

          9,047  

PIK interest

          158  

Balance, March 31,

  $     $ 37,708  

 

Preferred stock derivative liability

 

2022

   

2021

 

Balance, January 1,

  $ 21,282     $ 8,063  

Change in fair value

    645       7,375  

Balance, March 31,

  $ 21,927     $ 15,438