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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

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