Cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the customer may deposit additional funds at any time and effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid Investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Short-term investments, exclusive of cash equivalents, generally consist of marketable securities intended to be sold within one year (or the normal operating cycle if longer) and may include trading securities, available-for-sale securities, or held-to-maturity securities (if maturing within one year), as applicable.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.1)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Name:	us-gaap_CashCashEquivalentsAndShortTermInvestments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Organization (Details) $ in Thousands	2 Months Ended	12 Months Ended
Organization (Details) $ in Thousands	Mar. 03, 2021 USD ($)	Dec. 31, 2020 USD ($) product	Dec. 31, 2019 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of lead products \| product		2
Cash, cash equivalents and short-term investments		$ 123,300
Class of Stock [Line Items]
Issuance of common shares pursuant to the Open Market Sales Agreement		86,297	$ 18,601
Jefferies LLC \| Common Shares \| Sale Agreement
Class of Stock [Line Items]
Issuance of common shares pursuant to the Open Market Sales Agreement		$ 86,300	$ 19,500
Jefferies LLC \| Common Shares \| Sale Agreement \| Subsequent event
Class of Stock [Line Items]
Issuance of common shares pursuant to the Open Market Sales Agreement	$ 24,300