Collaboration Revenue - Changes in Contract Asset Included in Prepaid Expenses and Other Current Assets, and Contract Liabilities (Detail) - ASU 2014-09 [Member] - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | ||
---|---|---|---|---|
Jun. 30, 2018 |
Jun. 30, 2017 |
Jun. 30, 2018 |
Jun. 30, 2017 |
|
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] | ||||
Contract assets, Balance at Beginning of Period | $ 510 | $ 306 | ||
Contract assets, Additions | 175 | |||
Contract assets, Deductions | (510) | (8) | ||
Contract assets, Balance at End of Period | $ 175 | $ 298 | 175 | 298 |
Contract liabilities: | ||||
Balance at Beginning of Period | 123,783 | 108,814 | ||
Additions | 175 | |||
Deductions | (4,271) | (3,014) | (8,037) | (6,029) |
Balance at End of Period | $ 115,921 | $ 102,785 | $ 115,921 | $ 102,785 |