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Mergers and Acquisitions - GenVec - Additional Information (Details) - GenVec, Inc. $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jun. 30, 2017 shares | Jun. 30, 2017 USD ($) | Jun. 30, 2017 USD ($)
Business Acquisition [Line Items] |  |  |
Percentage of outstanding common stock acquired | 100.00% | 100.00% | 100.00%
Business combination, consideration paid, shares issued | shares | 684,240 |  |
Percent of collaboration payments | 50.00% |  |
Expected useful life of intangible asset | 11 years |  |
Period subsequent to acquisition during which a portion of collaboration payments received will be paid to former stockholders of acquired entity | 3 years |  |
Business combination, acquisition related costs |  |  | $ 510
Selling, general and administrative |  |  |
Business Acquisition [Line Items] |  |  |
Business combination, acquisition related costs |  | $ 260 | $ 498

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