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Asset Purchase Agreement with Azaya Therapeutics - Additional Information (Details) - Azaya Therapeutics, Inc. [Member]
$ in Thousands
6 Months Ended
Feb. 15, 2017
USD ($)
Candidate
shares
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Business Acquisition [Line Items]        
Total consideration $ 4,300      
Fair value of the common stock issued 2,300      
Assumed liabilities 1,800      
Acquisition costs 200      
In process research and development expense 1,700 $ 0 $ 1,686  
Asset Purchase Agreement        
Business Acquisition [Line Items]        
Book value of tangible assets acquired $ 3,000      
Common stock, shares issued | shares 117,325      
Common stock, shares issued after closing date | shares 87,994      
Common stock deposited in escrow | shares 29,331      
Obligation to pay on existing payables assumed $ 1,800      
Existing payables, paid during the period       $ 1,800
Asset Purchase Agreement | IPR&D [Member]        
Business Acquisition [Line Items]        
Number of drug candidates acquired | Candidate 2