Summary of Significant Accounting Policies (Details)	12 Months Ended
	Dec. 31, 2020 USD ($) segment	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Jun. 30, 2020 USD ($)	Dec. 31, 2014 USD ($)
Property, Plant and Equipment [Line Items]
Accounts receivable, net	$ 3,824,000	$ 0
Goodwill	6,234,000	6,234,000
Intangible asset, net	$ 0	102,500,000
Number of reporting units | segment	1
Number of operating segments | segment	1
Goodwill impairment	$ 0	0	$ 0
Finite-lived intangible asset	102,500,000	0
Impairment of long-lived assets	0	0	0
Advertising Expense	1,600,000
Shinyaku
Property, Plant and Equipment [Line Items]
Accounts receivable, net	$ 1,500,000
Accounts Receivable | Customer Concentration Risk
Property, Plant and Equipment [Line Items]
Concentration percentage (percent)	100.00%
Computer equipment and software
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	3 years
Furniture and fixtures | Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	3 years
Furniture and fixtures | Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	7 years
Fintepla rights
Property, Plant and Equipment [Line Items]
Finite-lived intangible asset				$ 102,500,000
IPR&D
Property, Plant and Equipment [Line Items]
Intangible asset, net					$ 102,500,000
Impairment of IPR&D	$ 0	$ 0	$ 0