v3.20.2
Note 4 - Revenue from Contracts with Customers (Details Textual) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended
May 31, 2020
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
 [1]
Jul. 17, 2015
Contract with Customer, Liability, Current   $ 196   $ 196   $ 411  
Amended License Agreement [Member]              
Revenue Recognition Milestone Method Agreed, Additional Amount, Based On Efforts And Targets             $ 194,500
Contract with Customer, Liability, Liability Eliminated   $ 0 $ 0 $ 2,572 $ 0    
Amended License Agreement [Member] | Based upon Successful Regulatory and Product Development Efforts [Member]              
Revenue Recognition Milestone Method Agreed, Additional Amount, Based On Efforts And Targets             28,500
Amended License Agreement [Member] | Based upon Net Sales Target Achievements [Member]              
Revenue Recognition Milestone Method Agreed, Additional Amount, Based On Efforts And Targets             $ 166,000
ZALVISO [Member]              
Contract with Customer, Liability, Liability Eliminated $ 2,600            
[1] The condensed consolidated balance sheet as of December 31, 2019 has been derived from the audited financial statements as of that date included in the Company's Annual Report on Form 10-K for the year ended December 31, 2019.