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Nature of Business (Details) - USD ($) $ in Thousands	1 Months Ended			12 Months Ended
	Feb. 28, 2021	Jan. 31, 2021	Jun. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	May 31, 2020
Liquidity
Number of common stock issued			6,900,000
Proceeds from offering of common stock, net of issuance costs			$ 203,700	$ 203,726	$ 116,341	$ 76,789
Accumulated deficit				665,197	$ 549,221
At Market Offering | Cowen and Company LLC ("Cowen")
Liquidity
Sales agreement amount of aggregate sale proceeds of common stock agreed to be issued							$ 150,000
Overallotment Option
Liquidity
Number of common stock issued			900,000
Overallotment Option | Subsequent Event
Liquidity
Proceeds from offering of common stock, net of issuance costs	$ 32,600
Public and Market Offering
Liquidity
Aggregate net proceeds				$ 648,700
Public Offering | Subsequent Event
Liquidity
Number of common stock issued		3,500,000
Proceeds from offering of common stock, net of issuance costs		$ 216,900

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