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Dispositions - Additional Information (Details) - USD ($) |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Nov. 04, 2015 | Feb. 28, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2017
Asset Purchase Agreement and Ology Bioservices License Agreement [Member] |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |
Cash payments from Ology Bioservices |  | $ 4,500,000 |  |  |
Number of shares removed from obligation to issue of common stock |  | 23,008 |  |  |
Contingent upon achieving certain specified future operating objectives |  | $ 3,000,000 |  |  |
Amount entitled to receive |  |  | $ 4,600,000 |  | $ 1,600,000
Milestone payment earned |  | $ 3,000,000 |  |  |
Amount received from sale of discontinued operation |  |  | $ 2,400,000 | $ 2,200,000 |
Biodefense Business [Member] |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |
Sales of business, number of common stock shares eligible to receive | 23,008 |  |  |  |
Royalties receivable percentage on net sales | 15.00% |  |  |  |
Biodefense Business [Member] | Maximum [Member] |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |
Cash payments from Ology Bioservices | $ 4,500,000 |  |  |  |

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