| Segment Reporting Disclosure [Text Block] | 
    We report information about our operating segments using the “management approach” in accordance with current accounting standards. This information is based on the way management organizes and reports the segments within the enterprise for making operating decisions and assessing performance. Our reportable segments are identified based on differences in products, services and markets served. There were  no  inter-segment sales. We manage our business based on  two  primary types of drug products: (i) diagnostic substances, including  Tc99m  tilmanocept and other diagnostic applications of our Manocept platform, and  NAV4694  (sublicensed in   April 2018),  and (ii) therapeutic development programs, including therapeutic applications of our Manocept platform.      Certain prior period amounts also have been reclassified to conform to the current period presentation. An adjustment has been made to the Consolidated Statements of Operations for the  three -month period ended   March 31, 2019,  to classify sublease revenue of   as a reduction in Selling, General and Administrative Expense. This change in classification does  not  affect previously reported net loss on the Consolidated Statement of Operations.         The information in the following tables is derived directly from each reportable segment’s financial reporting.          
T 
hree Months Ended March 31, 2020 
   |    |     |    |    |     |    |    |     |    |    |     |    |     |   Royalty revenue   |    |  $ |  15,221  |    |    |  $ |  —  |    |    |  $ |  —  |    |    |  $ |  15,221  |    |     |   Grant and other revenue   |    |    |  58,916  |    |    |    |  82,135  |    |    |    |  —  |    |    |    |  141,051  |    |     |   Total revenue   |    |    |  74,137  |    |    |    |  82,135  |    |    |    |  —  |    |    |    |  156,272  |    |     |   Cost of revenue   |    |    |  609  |    |    |    |  —  |    |    |    |  —  |    |    |    |  609  |    |     |   Research and development expenses   |    |    |  957,626  |    |    |    |  41,643  |    |    |    |  —  |    |    |    |  999,269  |    |      Selling, general and administrative expenses, excluding depreciation and amortization  
   |    |    |  —  |    |    |    |  (1,522  |    )   |    |    |  1,812,433  |    |    |    |  1,810,911  |    |      Depreciation and amortization  
   |    |    |  —  |    |    |    |  —  |    |    |    |  16,843  |    |    |    |  16,843  |    |      (Loss) income from operations  
   |    |    |  (884,098  |    )   |    |    |  42,014  |    |    |    |  (1,829,276  |    )   |    |    |  (2,671,360  |    )   |     |    |    |    |  —  |    |    |    |  —  |    |    |    |  (2,248  |    )   |    |    |  (2,248  |    )   |     |   Net loss   |    |    |  (884,098  |    )   |    |    |  42,014  |    |    |    |  (1,831,524  |    )   |    |    |  (2,673,608  |    )   |     |   Total assets, net of depreciation and amortization:   |    |    |    |    |    |    |    |    |    |    |    |    |    |    |    |    |     |   United States   |    |  $ |  36,671  |    |    |  $ |  2,494  |    |    |  $ |  4,438,066  |    |    |  $ |  4,477,231  |    |     |   International   |    |    |  —  |    |    |    |  —  |    |    |    |  —  |    |    |    |  —  |    |     |   Capital expenditures   |    |    |  —  |    |    |    |  —  |    |    |    |  6,459  |    |    |    |  6,459  |    |                 
T 
hree Months Ended March 31, 2019 
   |    |     |    |    |     |    |    |     |    |    |     |    |     |   Royalty revenue   |    |  $ |  3,150  |    |    |  $ |  —  |    |    |  $ |  —  |    |    |  $ |  3,150  |    |     |   Grant and other revenue   |    |    |  35,991  |    |    |    |  2,483  |    |    |    |  —  |    |    |    |  38,474  |    |     |   Total revenue   |    |    |  39,141  |    |    |    |  2,483  |    |    |    |  —  |    |    |    |  41,624  |    |     |   Cost of revenue   |    |    |  6,126  |    |    |    |  —  |    |    |    |  —  |    |    |    |  6,126  |    |     |   Research and development expenses   |    |    |  740,583  |    |    |    |  —  |    |    |    |  —  |    |    |    |  740,583  |    |      Selling, general and administrative expenses, excluding depreciation and amortization  
   |    |    |  —  |    |    |    |  11,714  |    |    |    |  1,680,023  |    |    |    |  1,691,737  |    |      Depreciation and amortization  
   |    |    |  —  |    |    |    |  —  |    |    |    |  36,779  |    |    |    |  36,779  |    |     |    |    |    |  (707,568  |    )   |    |    |  (9,231  |    )   |    |    |  (1,716,802  |    )   |    |    |  (2,433,601  |    )   |     |    |    |    |  —  |    |    |    |  —  |    |    |    |  8,713  |    |    |    |  8,713  |    |     |   Provision for income taxes   |    |    |  (256  |    )   |    |    |  (3  |    )   |    |    |  (617  |    )   |    |    |  (876  |    )   |     |   Net loss from continuing operations   |    |    |  (707,824  |    )   |    |    |  (9,234  |    )   |    |    |  (1,708,706  |    )   |    |    |  (2,425,764  |    )   |     |   Loss from discontinued operations, net of tax   |    |    |  (3,297  |    )   |    |    |  —  |    |    |    |  —  |    |    |    |  (3,297  |    )   |     |   Net loss   |    |    |  (711,121  |    )   |    |    |  (9,234  |    )   |    |    |  (1,708,706  |    )   |    |    |  (2,429,061  |    )   |     |   Total assets, net of depreciation and amortization:   |    |    |    |    |    |    |    |    |    |    |    |    |    |    |    |    |     |   United States   |    |  $ |  55,213  |    |    |  $ |  2,411  |    |    |  $ |  4,891,112  |    |    |  $ |  4,948,736  |    |     |   International   |    |    |  10,422  |    |    |    |  —  |    |    |    |  602  |    |    |    |  11,024  |    |     |   Capital expenditures   |    |    |  —  |    |    |    |  —  |    |    |    |  —  |    |    |    |  —  |    |               |   |     |   General and administrative expenses, excluding depreciation and amortization, represent costs that relate to the general administration of the Company and as such are  not  currently allocated to our individual reportable segments.    |          |   |     |   Depreciation and amortization are reflected in selling, general and administrative expenses ( $16,843  and  $36,779  for the  three -month periods ended   March  
31,  2020  and  2019,  respectively).    |          |   |     |   Income (loss) from operations does  not  reflect the allocation of certain selling, general and administrative expenses, excluding depreciation and amortization, to our individual reportable segments.    |          |   |     |   Amounts consist primarily of interest income and interest expense, which are  not  currently allocated to our individual reportable segments.    |      
 
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