Common Stock - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions			1 Months Ended
	Dec. 06, 2019	Jul. 22, 2019	Jul. 31, 2019
Class of Stock [Line Items]
Payments of stock issuance costs	$ 3.0
Payment of other stock issuance costs	0.4
Sale of stock, consideration received on transaction	$ 42.6
Public Stock Offering
Class of Stock [Line Items]
Sale of stock, number of shares issued in transaction (in shares)	6,250,000
Sale of stock, price per share (in dollars per share)	$ 4.00
Number of warrants issued (in shares)	3,750,000
Warrant price (USD per share)	$ 3.999
Over-Allotment Option
Class of Stock [Line Items]
Sale of stock, number of shares issued in transaction (in shares)	1,500,000
Sale of stock, price per share (in dollars per share)	$ 3.736
Warrant price (USD per share)	$ 3.735
License Agreements | University Of Massachusetts (UMass) | miniCEP290
Class of Stock [Line Items]
Shares issued for license fees (in shares)		75,000	75,000
Shares issued for license agreement (in shares)		100,000