Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Acquired and in-licensed rights	$ 8,712	$ 8,712
Less: accumulated amortization	(2,129)	(1,330)
Total intangible asset, net	$ 6,583	$ 7,382
Estimated useful life	11 years