Annual report pursuant to Section 13 and 15(d)

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

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Collaborative, Licensing and Other Arrangements - Rezolute - Additional Information (Details) - Rezolute [Member] - Collaborative Arrangement [Member] - USD ($)
 12 Months Ended 18 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 06, 2017
Dec. 31, 2017
Jun. 01, 2019
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    
Milestone received under license agreement       $ 0  
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