v3.22.2.2
Note 4 - Asset Acquisition (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Jan. 07, 2022
Sep. 30, 2022
Sep. 30, 2022
In Process Research and Development [Member]      
Impairment of Intangible Assets, Indefinite-Lived (Excluding Goodwill)   $ 0 $ 0
Lowell Therapeutics [Member]      
Business Combination, Consideration Transferred, Net of Cash Acquired $ 32,500    
Cash Acquired from Acquisition 3,549    
Business Combination, Options To Purchase Capital Stock Issued and Outstanding Cancelled, Exchange for Cash $ 3,500    
Business Combination, Acquiree Common Stock to Be Held Back to Satisfy Some Obligations (in shares) 69,808    
Business Combination, Acquiree Common Stock to Be Held Back to Satisfy Some Obligations, Value [1] $ 800    
Business Combination, Cash and Stock Paid for Transaction Costs 500    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets, Total [2] 8,819    
Business Combination, Consideration Transferred, Total 12,368    
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable 6,000    
Business Combination, Acquisition Related Costs 500    
Payments to Acquire Businesses, Gross 3,536    
Business Acquisition, Transaction Costs 2,521    
Lowell Therapeutics [Member] | Contingent Consideration Payable Upon Achievement of Milestones [Member]      
Business Combination, Contingent Consideration, Liability, Total $ 26,000    
Lowell Therapeutics [Member] | AcelRx Common Stock [Member]      
Business Combination, Options To Purchase Capital Stock Issued and Outstanding Cancelled, Exchange for Common Stock, Number (in shares) 450,477    
Business Combination, Acquiree Common Stock to Be Held Back to Satisfy Some Obligations, Fixed Value per Share (in dollars per share) $ 11.46    
Business Combination, Options To Purchase Capital Stock Issued and Outstanding Cancelled, Exchange for Common Stock, Value $ 5,200    
Business Combination, Acquiree Common Stock to Be Held Back to Satisfy Some Obligations (in shares) 69,808    
Business Combination, Acquiree Common Stock to Be Held Back to Satisfy Some Obligations, Value $ 800    
[1] Recorded as Other long-term liabilities in the Condensed Consolidated Balance Sheets.
[2] Recorded as In-process research and development asset in the Condensed Consolidated Balance Sheets.