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Contractual Revenue (Details) - Roche Agreement [Member] - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2013
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2017
Dec. 31, 2014
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]                                
Non-refundable upfront payment $ 35,000,000                              
Amortization     $ 3,600,000 $ 3,600,000 $ 3,600,000 $ 3,600,000 $ 3,600,000 $ 3,600,000 $ 3,600,000 $ 1,700,000 $ 1,700,000 $ 1,700,000 $ 1,700,000 $ 1,700,000    
Deferred revenue     $ 1,300,000                       $ 0  
Collaborative arrangement expiration                             Feb. 01, 2017  
Deferred revenue, revenue recognized   $ 1,300,000                            
Maximum potential for additional payments to be recognized upon the achievement of certain development milestones $ 40,000,000                              
First Milestone [Member]                                
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]                                
Deferred revenue, revenue recognized                               $ 10,000,000
Second Milestone [Member]                                
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]                                
Deferred revenue, revenue recognized               $ 10,000,000                
Third (Final) Milestone [Member]                                
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]                                
Deferred revenue, revenue recognized           $ 20,000,000