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Asset Purchase Agreement with Azaya Therapeutics - Additional Information (Details) - Azaya Therapeutics, Inc. [Member]
Feb. 15, 2017
USD ($)
Candidate
Employee
shares
Dec. 31, 2017
USD ($)
Business Acquisition [Line Items]    
Obligation to pay on existing payables assumed $ 1,796,000  
Total consideration 4,272,000  
Fair value of the common stock issued 2,311,000  
Assumed liabilities 1,800,000  
Acquisition costs 200,000  
Asset Purchase Agreement    
Business Acquisition [Line Items]    
Book value of tangible assets acquired $ 3,000,000  
Common stock, shares issued | shares 1,173,241  
Common stock, shares issued after closing date | shares 879,931  
Common stock deposited in escrow | shares 293,310  
Obligation to pay on existing payables assumed $ 1,800,000  
Existing payables, paid during the period   $ 1,800,000
Number of employees | Employee 0  
Maximum earn-out payment obligations $ 100,000,000  
Aggregate payment obligation threshold limit $ 50,000,000  
Percentage of net sales deemed for purposes of calculating payments 50.00%  
Asset Purchase Agreement | IPR&D [Member]    
Business Acquisition [Line Items]    
Number of drug candidates acquired | Candidate 2