Quarterly report pursuant to Section 13 or 15(d)

Sponsored Research and Clinical Trial Agreements - Additional Information (Detail)

v3.10.0.1
Sponsored Research and Clinical Trial Agreements - Additional Information (Detail) - USD ($)
 3 Months Ended 6 Months Ended
Mar. 12, 2018
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Columbia University [Member]          
Research And Development Expense   $ 27,000   $ 38,000  
Research and Development Arrangement, Contract to Perform for Others, Costs Incurred, Gross $ 100,000        
University of Texas [Member]          
Research And Development Expense   100,000 $ 100,000 200,000 $ 200,000
University of North Carolina [Member]          
Research And Development Expense   200,000   400,000  
Checkpoint Therapeutics, Inc [Member]          
Research And Development Expense   0 $ 200,000 31,000 $ 400,000
Umass Sponsored Research Agreement [Member]          
Research And Development Expense   30,000   400,000  
Sponsor Research Agreement, Funding Commitment   800,000   800,000  
Payments For Research And Development Expenses       800,000  
UNC Sponsored Research Agreement [Member]          
Sponsor Research Agreement, Funding Commitment   $ 2,300,000   2,300,000  
UNC Sponsored Research Agreement [Member] | Tamid [Member]          
Payments For Research And Development Expenses       $ 800,000