Stock Issuances (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions					12 Months Ended
	Oct. 17, 2022	Oct. 10, 2022	Oct. 07, 2022	Sep. 30, 2022	Dec. 31, 2022	Dec. 31, 2021
Subsidiary, Sale of Stock [Line Items]
Proceeds from issuance of stock					$ 7,747	$ 26,740
Li Ka-Shing
Subsidiary, Sale of Stock [Line Items]
Percentage of stock owned by affiliated entities, minimum				5.00%
Solina Chau
Subsidiary, Sale of Stock [Line Items]
Percentage of stock owned by affiliated entities, minimum				5.00%
September Financing
Subsidiary, Sale of Stock [Line Items]
Common stock issued (in shares)				2.5
Price of common stock issued (in dollars per share)				$ 1.25
Proceeds from issuance of stock			$ 2,900
Stock issuance, offering costs			$ 200
Registration rights agreement, liquidated damages potentially due, percent				1.00%
September Financing | Maximum
Subsidiary, Sale of Stock [Line Items]
Registration rights agreement, liquidated damages potentially due, percent				5.00%
NHSc Agreement
Subsidiary, Sale of Stock [Line Items]
Price of common stock issued (in dollars per share)		$ 1.31
Proceeds from issuance of stock	$ 4,800
Stock issuance, offering costs	$ 200
Number of shares to be purchased (in shares)		3.8
Securities purchase agreement, price determination, measurement period		10 days