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Licensing and Other Arrangements - NIAID - Additional Information (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2008 | Dec. 31, 2017 | Jun. 30, 2018 | Dec. 31, 2014
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |
Unearned revenue recognized under units-of-revenue method – non-current |  | $ 17,123 | [1] | $ 17,592 |
National Institute of Allergy and Infectious Diseases "NIAID" [Member] |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |
Contract liabilities |  | 800 |  | $ 800 |
National Institute of Allergy and Infectious Diseases "NIAID" [Member] | Arrangement with Governmental Agency 2 [Member] |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |
Total contract amount awarded | $ 64,800 |  |  |  |
Contracts revenue wrote off |  | $ 400 |  |  |
National Institute of Allergy and Infectious Diseases "NIAID" [Member] | Arrangement with Governmental Agency 3 [Member] |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |
Contractual term | 3 years |  |  |  |
Accounts receivable |  |  |  |  | $ 400
Unearned revenue recognized under units-of-revenue method – non-current |  |  |  |  | $ 800
[1] | The condensed consolidated balance sheet as of December 31, 2017 has been derived from the audited consolidated financial statements as of that date included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2017.

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