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Contract Assets and Contract Liabilities - Summary of Advanced Bllings (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Contract With Customer Asset And Liability [Line Items] |  |  |
Advanced billings | $ 126,387 |  | $ 73,756
Pre-funded study costs (includes $1.0 million with related parties at December 31, 2017) | 0 |  | $ 57,406
ASC 606 |  |  |
Contract With Customer Asset And Liability [Line Items] |  |  |
Advanced billings |  | $ 119,451 |
ASC 606 | Impact of Adoption of ASC 606 - Adjustments |  |  |
Contract With Customer Asset And Liability [Line Items] |  |  |
Advanced billings | (40,356) | 45,695 |
Pre-funded study costs (includes $1.0 million with related parties at December 31, 2017) | $ 57,487 | $ (57,406) |

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