Equity - Issuance of stock and warrants (Details) $ / shares in Units, $ in Thousands						3 Months Ended		6 Months Ended
	Jun. 16, 2022 USD ($) $ / shares shares	Aug. 11, 2021 shares	Jun. 28, 2021 USD ($) $ / shares shares	Jun. 21, 2021 USD ($) individual shares	Jun. 18, 2021 individual shares	Jun. 30, 2022 shares	Jun. 30, 2021 shares	Jun. 30, 2022 USD ($) shares	Jun. 30, 2021 USD ($) shares	Jun. 15, 2022 $ / shares	Jul. 16, 2021 $ / shares shares	Jun. 27, 2021 $ / shares
Equity
Issuance of stock from RSUs (shares)						143,544	0	143,544	909,191
Issuance of common stock upon exercise of warrants, net of transaction costs (in shares)	3,738,642				200,000
Proceeds from warrants exercised | $								$ 2,489	$ 45,616
Warrant exercise price (in dollars per share) | $ / shares	$ 0.6665									$ 6.00
Warrants exercise price expressed											95.00%
Payment of credit agreement | $									$ 10,500
Stock issued (in shares)					100,000
Number of healthcare focused institutional investors | individual				2	2
Credit agreement
Equity
Payment of credit agreement | $			$ 10,500
2019 private placement
Equity
Issuance of common stock upon exercise of warrants, net of transaction costs (in shares)				187,674
Proceeds from warrants exercised | $				$ 100
Stock issued (in shares)				130,445
Restricted Shares
Equity
Common stock issued for professional services (in shares)		37,500
Contract expiration term		6 months
Class Of Warrant Investors Issued June 2022
Equity
Issuance of common stock upon exercise of warrants, net of transaction costs (in shares)	3,700,000
Proceeds from warrants exercised | $	$ 2,500
June 2021 warrants
Equity
Issuance of common stock upon exercise of warrants, net of transaction costs (in shares)			7,929,384
Proceeds from warrants exercised | $			$ 45,500
June 2021 warrants | Credit agreement
Equity
Proceeds to repay | $			10,800
Payment of credit agreement | $			10,500
Accrued interest | $			$ 300
Series E warrants
Equity
Warrant exercise price (in dollars per share) | $ / shares			$ 6.00									$ 10.64
New Unregistered Warrants
Equity
Issuance of common stock upon exercise of warrants, net of transaction costs (in shares)	900,000		7,100,000
Number of shares in exchange of warrant exercise	3,700,000		5,947,039
Percentage of common stock issued	100.00%		75.00%
Cash purchase price per share | $ / shares	$ 0.6665		$ 0.09375							$ 6.00
Warrant exercise price (in dollars per share) | $ / shares			$ 6.00
Exchange Warrants
Equity
Number of shares in exchange of warrant exercise											504,861
Warrant exercise price (in dollars per share) | $ / shares											$ 4.038
New Warrants
Equity
Warrant exercise price (in dollars per share) | $ / shares											$ 4.038
Warrants term											5 years
New Warrants | Maximum
Equity
Number of shares in exchange of warrant exercise											400,000
Common Stock
Equity
Issuance of stock from RSUs (shares)						143,544		909,191
Issuance of common stock upon exercise of warrants, net of transaction costs (in shares)						888,642		888,642
Common Stock | 2019 private placement
Equity
Stock issued (in shares)				57,229
Warrants to purchase common stock
Equity
Unissued shares held in abeyance (in shares)	2,900,000
Number of unexercised warrants	1,600,000