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Commitments and Contingencies (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Loss Contingencies [Line Items]      
Purchase commitment, amount   $ 6,700,000  
Related party borrowings   (68,767,000) $ 0
Operating leases, rent expense   300,000 200,000
Loss contingency accrual $ 0 0 $ 0
2019   890,000  
2020   139,000  
2021   0  
Operating leases, future minimum payments due   1,029,000  
ALPHAEON      
Loss Contingencies [Line Items]      
Related party borrowings $ 2,500,000    
Daewoong      
Loss Contingencies [Line Items]      
Purchase commitment, amount   $ 3,500,000