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Note 11 - Stock-based Compensation (Tables)
9 Months Ended
Sep. 30, 2022
Notes Tables  
Share-Based Payment Arrangement, Option, Activity [Table Text Block]
  

Number of

Shares

  

Weighted-

Average Exercise

Price

  

Weighted-Average

Remaining

Contractual Term

(Years)

 

Balance at December 31, 2021

  4,640,660  $6.64   5.66 

Granted

  2,972,722   0.72     

Forfeited

  (128,089)  1.55     

Cancelled

  (36,982)  21.11     

Exercised

  (43,453)  0.41     

Balance at September 30, 2022

  7,404,858  $4.31   5.53 
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Exercisable [Table Text Block]
  

Number of

Shares

  

Weighted-

Average Exercise

Price

  

Weighted-Average

Remaining

Contractual Term

(Years)

  

Aggregate

Intrinsic Value

(Millions)

 

Exercisable at September 30, 2022

  3,406,210  $7.51   4.97  $0.1 

Vested or expected to vest at September 30, 2022

  7,130,536  $4.43   5.51  $0.1 
Share-Based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block]
  

Number of

Restricted Stock

Units

Outstanding

  

Weighted-

Average Grant

Date Fair Value

 

Unvested December 31, 2021

  3,839,030  $2.36 

Granted

  6,430,606   0.74 

Vested

  (1,973,238)  2.40 

Forfeited

  (257,823)  1.23 

Unvested September 30, 2022

  8,038,575  $1.08 
Share-Based Payment Arrangement, Cost by Plan [Table Text Block]
  

Three Months Ended September 30,

  

Nine Months Ended September 30,

 
  

2022

  

2021

  

2022

  

2021

 
  

(in thousands)

  

(in thousands)

 

Stock options

 $913  $1,346  $2,812  $3,552 

Restricted stock units

  772   1,581   2,480   2,933 

Performance restricted stock units

  348   34   1,069   104 
  $2,033  $2,961  $6,361  $6,589 
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
  

Nine Months Ended September 30,

 
  

2022

  

2021

 

Expected dividend yield

  0%    0%  

Expected volatility

 128%-133%  118%-139% 

Risk-free interest rate

 1.25%-2.98%  0.33%-0.73% 

Expected life (in years)

 3.8-4.5  3.8-4.5