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Intangible Assets - Summary of Estimated Fair Values of Assets Acquired and Liabilities Assumed (Details) - USD ($) | Dec. 31, 2017 | Jul. 31, 2016 | May 02, 2016
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Business Combination Segment Allocation [Line Items] |  |  |
Liability assumed (HPI) |  |  | $ (1,000,000)
Houston Pharmaceuticals, Inc |  |  |
Business Combination Segment Allocation [Line Items] |  |  |
Liability assumed (HPI) | $ (3,874,000) | $ (3,874,000) |
Moleculin LLC |  |  |
Business Combination Segment Allocation [Line Items] |  |  |
Cash | 0 |  |
Property and equipment | 8,000 |  |
Intangibles | 11,148,000 |  |
Total assets acquired | 11,156,000 |  |
Other liabilities assumed, including $470 of notes payable | (1,224,000) |  |
Net assets acquired/total consideration transferred | 6,057,000 |  |
Other liabilities assumed, notes payable | $ 470,000 |  |

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- Definition Amount of assets acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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- Definition Amount of other liabilities due within one year or within the normal operating cycle, if longer, assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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- Definition Amount of intangible assets, excluding goodwill, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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