Quarterly report pursuant to Section 13 or 15(d)

Licensing and Other Arrangements - Rezolute - Additional Information (Details)

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Licensing and Other Arrangements - Rezolute - Additional Information (Details) - USD ($)
 3 Months Ended 18 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 30, 2018
Dec. 06, 2017
Mar. 31, 2018
Mar. 31, 2017
Jun. 01, 2019
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]              
Proceeds from issuance of common stock         $ 2,309,000 $ 5,380,000  
Contract revenue         $ 401,000 $ 150,000  
Rezolute [Member] | Initial Closing [Member]              
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]              
Common stock value receivable     $ 5,000,000        
Rezolute [Member] | Qualified Financing [Member]              
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]              
Common stock value receivable     7,000,000        
Rezolute [Member] | 2019 Closing [Member]              
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]              
Common stock value receivable     $ 7,000,000        
Rezolute [Member] | License Agreement [Member]              
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]              
Future milestone payments, maximum       $ 232,000,000      
Eligible to receive in cash       6,000,000      
Eligible to receive common stock, financing activities       $ 12,000,000      
Number of shares of common stock held for future issuance       5,000,000      
Common stock purchase agreement description         Under the common stock purchase agreement, Rezolute granted the Company the right and option to sell the greater of (i) 5,000,000 shares of common stock or (ii) one third of the aggregate shares held by the Company upon failure by Rezolute to list its shares of its common stock on the Nasdaq Stock Market or a similar national exchange on or prior to December 31, 2018.    
Percentage of aggregate shares held for future issuance       33.33%      
Agreement termination notice period       90 days      
Rezolute [Member] | License Agreement [Member] | Forecast [Member]              
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]              
Future milestone payments, maximum             $ 237,000,000
Upfront option fee             $ 1,000,000
Gross proceeds from qualified financing   $ 20,000,000          
Additional common stock receive for qualified financing   $ 7,000,000          
Common stock, trading period   10 days          
Eligible to receive, in order to maintain license agreement $ 15,000,000            
Rezolute [Member] | Amended Common Stock Purchase Agreement [Member] | Initial Closing [Member]              
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]              
Common stock shares receivable     7,000,000        
Rezolute [Member] | Amended Common Stock Purchase Agreement [Member] | Qualified Financing [Member]              
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]              
Common stock value receivable     $ 8,500,000        
Rezolute [Member] | Amended Common Stock Purchase Agreement [Member] | 2019 Closing [Member]              
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]              
Common stock value receivable     $ 8,500,000        
Rezolute [Member] | Common Stock Purchase Agreement [Member] | Interim Financing Closing              
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]              
Issuance of common stock, shares         69,252    
Proceeds from issuance of common stock         $ 50,000    
Contract revenue         $ 0