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Related Party Transactions (Details) - USD ($)
$ in Thousands
1 Months Ended 9 Months Ended 12 Months Ended
Nov. 30, 2017
Sep. 30, 2019
Dec. 31, 2018
Aspect Pharmaceuticals, LLC and Vicept Therapeutics, Inc [Member]      
Related Party Transactions      
Royalty expense   $ 576  
Milestone payments   0  
Board of Directors Chairman [Member] | Direct sublease agreement      
Related Party Transactions      
Lease termination charge $ (590)    
Expenses incurred under related party transactions   0 $ 570
Board of Directors Chairman [Member] | Services agreement      
Related Party Transactions      
Amount due to related party   $ 0 $ 0