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Note 5 - Fair Value (Tables)
12 Months Ended
Dec. 31, 2020
Notes Tables  
Fair Value, Assets Measured on Recurring Basis [Table Text Block]
  

December 31, 2020

 
  

(In thousands)

 

Description

 

Quoted Prices in Active Markets for Identical Assets
(Level 1)

  

Significant Other
Observable Inputs
(Level 2)

  

Significant
Unobservable Inputs
(Level 3)

  

Total

 

Assets measured at fair value

                

Cash and cash equivalents

 $16,363  $  $  $16,363 

Restricted cash

  1,166         1,166 

Total Assets measured at fair value

 $17,529  $  $  $17,529 

Liabilities measured at fair value

                

Contingent consideration

 $  $  $3,936  $3,936 

Warrant liabilities

        255   255 

Total liabilities measured at fair value

 $  $  $4,191  $4,191 
  

December 31, 2019

 
  

(In thousands)

 

Description

 

Quoted Prices in Active Markets for Identical Assets
(Level 1)

  

Significant Other Observable Inputs
(Level 2)

  

Significant Unobservable Inputs
(Level 3)

  

Total

 

Assets measured at fair value

                

Cash and cash equivalents

 $9,598  $  $  $9,598 

Restricted cash

  969         969 

Total Assets measured at fair value

 $10,567  $  $  $10,567 

Liabilities measured at fair value

                

Contingent consideration

 $  $  $1,084  $1,084 

Warrant liabilities

        2,388   2,388 

Total liabilities measured at fair value

 $  $  $3,472  $3,472 
Fair Value Measurement Inputs and Valuation Techniques [Table Text Block]

Series B

 

December 31, 2020

  

December 31, 2019

 

Fair value (million)

 $0.3  $2.4 

Valuation methodology

 

Black-Scholes-Merton

  

Monte Carlo

 

Term (years)

  1.32   2.32 

Risk free rate

  0.10%  1.59%

Dividends

      

Volatility

  150.97%  109.80%

Share price

 $0.63  $1.47 

Probability of additional financing

  N/A  

100% in 2020

 
  

Valuation
Methodology

 

Significant
Unobservable Input

 

Weighted Average
(range, if
applicable)

      

December 31, 2020

 

December 31, 2019

Contingent consideration

 

Probability weighted
income approach

 

Milestone dates

  2024to2029  2020to2024
    

Discount rate

  9.5%to15.75%  10%to11%
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
  

Fair Value
Measurement at
Reporting Date
(Level 3)

 
  

(In thousands)

 
  

Common stock
warrants

  

Contingent
consideration

 

Balance at December 31, 2018

 $4,636  $10,637 

Change in fair value

  (2,248

)

  (9,553

)

Balance at December 31, 2019

  2,388   1,084 

Exchange of warrants for common stock

  (2,469

)

   

Payment for contingent consideration

     (74

)

Change in fair value

  336   2,924 

Balance at December 31, 2020

  255   3,936 

Current portion

      

Long-term portion

  255   3,936 

Balance at December 31, 2020

 $255  $3,936