Stockholders' Equity - At-the-market equity and follow on offering programs (Details) - USD ($)	1 Months Ended	3 Months Ended
	May 06, 2022	Mar. 31, 2022	May 05, 2022	Feb. 28, 2022	May 31, 2020
2020 ATM
Offering program
Amount of shares authorized to be offered and sold					$ 100,000,000
2020 ATM | Common Stock
Offering program
Number of shares sold (in shares)		11,740,210
Net proceeds from the at-the-market facility		$ 54,800,000
2022 ATM
Offering program
Amount of shares authorized to be offered and sold				$ 100,000,000
2022 ATM | Common Stock
Offering program
Number of shares sold (in shares)		1,429,693
Net proceeds from the at-the-market facility		$ 5,800,000
2022 ATM | Common Stock | Subsequent Event
Offering program
Number of shares sold (in shares)	9,904,964
Net proceeds from the at-the-market facility	$ 40,000,000
Remaining unsold and available amount			$ 53,300,000
At Market Equity Offering Programs | Common Stock
Offering program
Number of shares sold (in shares)		13,169,903