Stockholders' Equity (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Preferred stock, shares authorized		3,000,000	3,000,000
Preferred stock, shares outstanding		0	0
Net proceeds from sale of common stock		$ 170,792	$ 16,248	$ 29,022
Series C-1 Preferred Stock
Preferred stock, shares authorized		350,000
Preferred stock, shares outstanding		0	0
Common Stock
Shares issued in connection with at the market agreement (in shares)		7,125,004	5,011,157	2,702,660
Common stock issued (in shares)		15,384,614
Aggregate gross offering price available		$ 50,000
Underwritten Public Offering
Net proceeds from sale of common stock	$ 141,400
Common stock issued (in shares)	15,384,614