Commitments and Contingencies - License Agreement (Details) £ in Thousands			12 Months Ended
	Jul. 11, 2019 GBP (£)	Jun. 22, 2017 USD ($) trading_days payment	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Other Commitments [Line Items]
License Agreement Cost		$ 250,000
Rent expense | £	£ 20
License Agreement
Other Commitments [Line Items]
Upfront payments | payment		2
Percent of upfront payments which may be paid by issuing common stock		50.00%
Percent of average share price		75.00%
Threshold trading days | trading_days		20
Maximum additional product milestone payments		$ 1,800,000
Maximum additional commercialization milestone payments		$ 5,000,000
Termination advance notice period		30 days
Rent expense			$ 0	$ 350,000
Supply Agreement
Other Commitments [Line Items]
Other commitment, period		20 years
Material cure period		60 days