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License Agreements, Clinical Research Support Agreements and Sponsored Research Agreements (Details Textual) - USD ($) |  | 1 Months Ended | 10 Months Ended | 12 Months Ended |  |
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Jul. 03, 2017 | Nov. 20, 2017 | May 31, 2017 | Mar. 31, 2017 | Mar. 17, 2017 | Feb. 28, 2017 | Oct. 31, 2016 | Apr. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Nov. 28, 2017 | Jul. 31, 2016
Research And Development Expense, Sponsored Research Payment |  |  |  |  |  |  |  |  |  |  |  |  | $ 800,000 |
Research and Development Expense |  |  |  |  |  |  |  |  |  |  | $ 100,000 |  |  |
Common Stock, Shares, Outstanding |  |  |  |  |  |  |  |  |  |  | 25,236,255 | 15,165,244 |  |
Professional Fees |  |  |  |  |  |  |  |  |  |  | $ 120,000 | $ 120,000 |  |
Stock Issued During Period, Value, Purchase of Assets |  |  |  |  |  |  |  |  |  | $ 147,000 | $ 1,682,000 |  |  |
Proceeds from Issuance of Private Placement |  |  |  |  |  |  | $ 10,000,000 |  |  |  |  |  |  |
Common Stock, Shares Authorized |  |  |  |  |  |  |  |  |  |  | 50,000,000 | 50,000,000 |  |
Psca Technology License [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment Of Upfront Fees |  |  | $ 300,000 |  |  |  |  |  |  |  |  |  |  |
Revenue Recognition Milestone Method Payments Due |  |  | 14,900,000 |  |  |  |  |  |  |  |  |  |  |
Maintenance Costs |  |  | 50,000 |  |  |  |  |  |  |  |  |  |  |
Cs Technology License [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment Of Upfront Fees |  |  | 600,000 |  |  |  |  |  |  |  |  |  |  |
Revenue Recognition Milestone Method Payments Due |  |  | 14,900,000 |  |  |  |  |  |  |  |  |  |  |
Maintenance Costs |  |  | 50,000 |  |  |  |  |  |  |  |  |  |  |
IL13Ra2 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Research and Development Expense |  |  |  |  |  |  |  |  |  |  | $ 1,400,000 |  |  |
Harvard College License [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment Of Upfront Fees |  | $ 300,000 |  |  |  |  |  |  |  |  |  |  |  |
Other Commitment, Due in Next Twelve Months |  | 25,000 |  |  |  |  |  |  |  |  |  |  |  |
Other Commitment, Due in Third Year |  | 100,000 |  |  |  |  |  |  |  |  |  |  |  |
Other Commitment, Due in Second Year |  | 50,000 |  |  |  |  |  |  |  |  |  |  |  |
Development Milestones Method Additional Payments Due |  | $ 16,700,000 |  |  |  |  |  |  |  |  |  |  |  |
CD123 CRA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Research and Development Expense |  |  |  |  |  |  |  |  |  |  | $ 1,400,000 |  |  |
Stephen Forman [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual Consulting Fees |  |  |  |  |  |  |  |  |  |  |  | $ 60,000 |  |
Christine Brown [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual Consulting Fees |  |  |  |  |  |  |  |  |  |  |  | 60,000 |  |
University of California [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Development Milestones Method Additional Payments Due |  |  |  |  | $ 14,300,000 |  |  |  |  |  |  |  |  |
University of California [Member] | UCLA License [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment Of Upfront Fees |  |  |  |  | 200,000 |  |  |  |  |  |  |  |  |
Other Commitment, Due in Next Twelve Months |  |  |  |  | 15,000 |  |  |  |  |  |  |  |  |
Other Commitment, Due in Fifth Year |  |  |  |  | 50,000 |  |  |  |  |  |  |  |  |
Other Commitment, Due in Fourth Year |  |  |  |  | $ 25,000 |  |  |  |  |  |  |  |  |
City Of Hope [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue Recognition Milestone Method Payments Due |  |  |  |  |  | $ 100,000 |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Purchase of Assets |  |  |  |  |  |  |  |  |  |  | 293,588 |  |  |
Payments for Other Fees |  |  |  | $ 100,000 |  |  |  |  |  |  |  |  |  |
City Of Hope [Member] | Intellectual Property [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment Of Upfront Fees |  |  |  |  |  |  |  | $ 2,000,000 |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  |  |  |  |  |  |  |  | 10.00% |  |  |  |  |
Stock Issued During Period, Shares, Purchase of Assets |  |  |  |  |  |  |  |  | 1,000,000 |  |  |  |  |
City Of Hope [Member] | Intellectual Property [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Royalty Expense |  |  |  |  |  |  |  |  | $ 1,000,000 |  |  |  |  |
City Of Hope [Member] | Commitment One [Member] | Intellectual Property [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Development Milestones Method Additional Payments Due |  |  |  |  |  |  |  |  | 2,000,000 |  |  |  |  |
City Of Hope [Member] | Commitment Two [Member] | Intellectual Property [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Development Milestones Method Additional Payments Due |  |  |  |  |  |  |  |  | 14,500,000 |  |  |  |  |
City Of Hope [Member] | AR CD123 License [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment Of Upfront Fees |  |  |  |  |  | 19,450 |  |  |  |  |  |  |  |
Revenue Recognition Milestone Method Payments Due |  |  |  |  |  | 14,500,000 |  |  |  |  |  |  |  |
Research And Development Expense, Sponsored Research Payment |  |  |  |  |  | 200,000 |  |  |  |  |  |  |  |
Research and Development Expense |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |
Licensing Arrangements Additional Costs Incurred |  |  |  |  |  | 97,490 |  |  |  |  |  |  |  |
Maintenance Costs |  |  |  |  |  | 25,000 |  |  |  |  |  |  |  |
City Of Hope [Member] | IL License [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue Recognition Milestone Method Payments Due |  |  |  |  |  | 14,500,000 |  |  |  |  |  |  |  |
Maintenance Costs |  |  |  |  |  | 25,000 |  |  |  |  |  |  |  |
City Of Hope [Member] | Her2 Technology License [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment Of Upfront Fees |  |  | 600,000 |  |  |  |  |  |  |  |  |  |  |
Revenue Recognition Milestone Method Payments Due |  |  | 14,900,000 |  |  |  |  |  |  |  |  |  |  |
Maintenance Costs |  |  | $ 50,000 |  |  |  |  |  |  |  |  |  |  |
City Of Hope [Member] | Spacer License [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maintenance Costs |  |  |  |  |  | 10,000 |  |  |  |  |  |  |  |
City Of Hope [Member] | IL13Ra2 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment Of Upfront Fees |  |  |  |  |  | 9,300 |  |  |  |  |  |  |  |
Research And Development Expense, Sponsored Research Payment |  |  |  |  |  | 200,000 |  |  |  |  |  |  |  |
Research and Development Expense |  |  |  |  |  |  |  |  |  |  | 0 |  |  |
Licensing Arrangements Additional Costs Incurred |  |  |  |  |  | $ 100,000 |  |  |  |  |  |  |  |
City Of Hope [Member] | Sponsored Research Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Research and Development Expense |  |  |  |  |  |  |  |  | $ 2,000,000 | $ 1,500,000 | 2,000,000 | $ 2,000,000 |  |
Fred Hutchinson Cancer Research Center [Member] | CD20 Technology License [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment Of Upfront Fees | $ 300,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Maintenance Costs | 50,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Development Milestones Method Additional Payments Due | 39,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Fred Hutchinson Cancer Research Center [Member] | CD20 Clinical Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Research And Development Expense, Sponsored Research Payment | $ 5,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Research and Development Expense |  |  |  |  |  |  |  |  |  |  | $ 600,000 |  |  |
Common Class A [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Purchase of Assets |  |  |  |  |  |  |  |  |  | 1,000,000 | 0 |  |  |
Common Stock, Shares, Outstanding |  |  |  |  |  |  |  |  |  |  | 1,000,000 | 1,000,000 |  |
Noncontrolling Interest, Ownership Percentage by Parent |  |  |  |  |  |  |  |  |  |  | 5.00% |  |  |
Stock Issued During Period, Value, Purchase of Assets |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 |  |  |
Common Stock, Shares Authorized |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 |  | 1,000,000
Common Class A [Member] | City Of Hope [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Purchase of Assets |  |  |  |  |  |  | 293,588 |  |  |  |  |  |  |
Common Class A [Member] | City Of Hope [Member] | Market Approach Valuation Technique [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Granted During Period, Value Per Share Determined |  |  |  |  |  |  | $ 5.73 |  |  |  |  |  |  |
Stock Issued During Period, Value, Purchase of Assets |  |  |  |  |  |  | $ 1,700,000 |  |  |  |  |  |  |
Common Class A [Member] | City Of Hope [Member] | Intellectual Property [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Research and Development Expense |  |  |  |  |  |  |  |  |  | $ 100,000 |  |  |  |
Stock Granted During Period, Valuation Inputs, Weighted Marketability Rate |  |  |  |  |  |  |  |  | 44.80% |  |  |  |  |
Stock Granted During Period, Valuation Inputs, Weighted Average Cost of Capital |  |  |  |  |  |  |  |  | 30.00% |  |  |  |  |
Common Class A [Member] | City Of Hope [Member] | Intellectual Property [Member] | Discounted Cash Flow Model [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Granted During Period, Value Per Share Determined |  |  |  |  |  |  |  |  | $ 0.147 |  |  |  |  |
Stock Issued During Period, Value, Purchase of Assets |  |  |  |  |  |  |  |  | $ 100,000 |  |  |  |  |

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