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Subsequent Events (Details)					3 Months Ended	12 Months Ended
	Mar. 23, 2020 $ / shares shares	Jan. 02, 2020 $ / shares shares	Jun. 25, 2019 $ / shares	Jan. 02, 2019 $ / shares shares	Mar. 31, 2020 EUR (€)	Dec. 31, 2019 $ / shares shares	Dec. 31, 2018 $ / shares shares
Subsequent Event [Line Items]
Options granted (in shares) | shares						1,089,000	1,120,500
Weighted average exercise price, granted (USD per share) | $ / shares						$ 2.26	$ 1.44
Subsequent Event
Subsequent Event [Line Items]
Research contract, expansion | €					€ 700,000
Research contract, expansion, term					19 months
Executives and Key Personnel
Subsequent Event [Line Items]
Weighted average exercise price, granted (USD per share) | $ / shares				$ 1.87
Executives and Key Personnel | Subsequent Event
Subsequent Event [Line Items]
Options granted (in shares) | shares		525,000
Weighted average exercise price, granted (USD per share) | $ / shares		$ 5.27
Executives and Key Personnel | Stock Option
Subsequent Event [Line Items]
Options granted (in shares) | shares				600,000
Board of Directors
Subsequent Event [Line Items]
Options granted (in shares) | shares				300,000
Weighted average exercise price, granted (USD per share) | $ / shares			$ 5.83	$ 1.87
Board of Directors | Subsequent Event
Subsequent Event [Line Items]
Options granted (in shares) | shares		325,000
Weighted average exercise price, granted (USD per share) | $ / shares		$ 5.27
Board of Directors | Stock Option | Subsequent Event
Subsequent Event [Line Items]
Award vesting period		1 year
Non-executive Employees | Subsequent Event
Subsequent Event [Line Items]
Options granted (in shares) | shares		23,000
Weighted average exercise price, granted (USD per share) | $ / shares		$ 5.27
Non-executive Employees | Stock Option | Subsequent Event
Subsequent Event [Line Items]
Award vesting period		4 years
Consultant | Subsequent Event
Subsequent Event [Line Items]
Options granted (in shares) | shares	25,000	15,000
Weighted average exercise price, granted (USD per share) | $ / shares	$ 3.99	$ 5.27
Consultant | Stock Option | Subsequent Event
Subsequent Event [Line Items]
Award vesting period	6 months	1 year
Minimum | Executives and Key Personnel | Stock Option | Subsequent Event
Subsequent Event [Line Items]
Award vesting period		1 year
Maximum | Executives and Key Personnel | Stock Option | Subsequent Event
Subsequent Event [Line Items]
Award vesting period		4 years

X

- Definition

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+ References

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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- Definition

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- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

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