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Contractual Revenue (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]                      
Revenue $ 19,526,000 $ 18,160,000 $ 21,578,000 $ 19,362,000 $ 24,935,000 $ 23,545,000 $ 20,073,000 $ 24,915,000 $ 78,626,000 $ 93,468,000 $ 90,714,000
Contractual [Member]                      
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]                      
Revenue                     $ 12,134,000
Remaining potential for additional payments to be recognized upon the achievement of certain development milestones $ 0               $ 0