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Asset Purchase Agreement with Azaya Therapeutics - Additional Information (Details) - Azaya Therapeutics, Inc. [Member] | Feb. 15, 2017 USD ($) Candidate Employee shares | Dec. 31, 2017 USD ($)
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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 |

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