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Note 6 - Fair Value (Tables)
12 Months Ended
Dec. 31, 2021
Notes Tables  
Fair Value, Assets Measured on Recurring Basis [Table Text Block]
  

December 31, 2021

 
  

(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 (1)

 $18,129  $-  $-  $18,129 

Restricted cash

  1,154   -   -  $1,154 

Short-term investments

  -   80,262   -  $80,262 

Long-term investments

  -   37,435   -  $37,435 

Total assets measured at fair value

 $19,283  $117,697  $-  $136,980 

Liabilities measured at fair value

                

Contingent consideration

 $-  $-  $2,371  $2,371 

Total liabilities measured at fair value

 $-  $-  $2,371  $2,371 
  

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 
Fair Value Measurement Inputs and Valuation Techniques [Table Text Block]
     

December 31,

 
 

Valuation
Methodology

 

Significant
Unobservable
Input

 

2021

  

2020

 
            

Contingent consideration

Probability
weighted income
approach

 

Milestone dates

 

 

2031  

 

2025 
   

Discount rate

  9.5%   9.5% 
   

Revenue volatility

  39.0%   71.0% 
  

December 31,

  

December 31,

  

December 31,

 

Series B Warrants

 

2021

  

2020

  

2019

 
             

Valuation methodology

 

Black-Scholes-Merton

  

Black-Scholes-Merton

  

Monte Carlo

 

Term (years)

  1.22   1.32   2.32 

Risk free rate

  0.07%  0.10%  1.59%

Dividends

  -   -   - 

Volatility

  174.00%  150.97%  109.80%

Share price

 $4.21  $0.63  $1.47 
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
  

Fair Value Measurement at Reporting Date (Level 3)

 
  

(in thousands)

 
  

Series B 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 

Exercise of warrants

 $(2,236) $- 

Change in fair value

  1,981  $(1,565)

Balanceat December 31, 2021

 $-  $2,371 
         

Current portion

 $-  $- 

Long-term portion

  -   2,371 

Balance at December 31, 2021

 $-  $2,371