Subsequent Events (Narrative) (Details)	1 Months Ended
	Feb. 28, 2021	Jan. 31, 2021
Subsequent Event Narrative Details Abstract
Subsequent Event, Date	Feb. 15, 2021	Jan. 28, 2021
Subsequent Event, Description	On February 15, 2021 the Company entered into an amendment to the asset purchase agreement with Vyera. Pursuant to the amendment, the Company agreed to make cash payments to Vyera in the amount of $3.0 million in each of February 2021, June 2021 and September 2021 in exchange for a lower royalty percentage on potential net sales of SLS-002.	On January 28, 2021, the Company completed an underwritten public offering, pursuant to which the Company sold 17,530,488 shares of its common stock, at a price to the public of $2.05 per share, which included the exercise in full by the underwriter of its option to purchase up to 2,286,585 additional shares of common stock. The net proceeds to the Company from the offering were approximately $33.5 million, after deducting underwriting discounts and commissions and other estimated offering expenses payable by the Company. The Company used $3.8 million of the net proceeds from the offering for the partial repayment of certain outstanding convertible promissory notes.