Stockholders' Equity (Details) $ / shares in Units, $ in Thousands, $ in Millions										3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 26, 2024	Jun. 06, 2024	Apr. 30, 2024 USD ($) Warrant $ / shares shares	Oct. 17, 2023 USD ($) $ / shares shares	Oct. 17, 2023 AUD ($)	Oct. 12, 2023 shares $ / shares	Jun. 19, 2023 Tranches $ / shares shares	Mar. 12, 2019	Nov. 27, 2017 USD ($)	Jun. 30, 2024 USD ($) $ / shares shares	Jun. 30, 2023 USD ($) shares	Jun. 30, 2024 USD ($) $ / shares shares	Jun. 30, 2023 USD ($)	Dec. 31, 2023 USD ($) $ / shares shares	Aug. 13, 2024 $ / shares shares	Jul. 25, 2024 $ / shares
Class of Stock Disclosures [Abstract]
Preferred stock, shares outstanding (in shares)										0		0		0
Common stock, par value (in dollars per share) | $ / shares										$ 0.0001		$ 0.0001		$ 0.0001
Period of warrants expected to vest												48 months
Gross proceeds from public stock offering | $												$ 2,403	$ 0
Preferred stock, par value (in dollars per share) | $ / shares										$ 0.0001		$ 0.0001		$ 0.0001
Common stock warrant liability | $										$ 8,579		$ 8,579		$ 2,843
Increase in warrant liability | $										$ (198)	$ 0	$ (720)	$ 755
Reverse stock split	0.028
Minimum [Member]
Class of Stock Disclosures [Abstract]
Reverse stock split		0.20
Maximum [Member]
Class of Stock Disclosures [Abstract]
Reverse stock split		0.014
At-the-Market Program [Member]
Class of Stock Disclosures [Abstract]
Issuance of common stock, net (in shares)														18,781
Gross proceeds from public stock offering | $														$ 2,300
Net proceeds from public stock offering | $														$ 2,100
Aggregate cash fee paid to underwriter or placement agent												3.00%
April 2024 Offering [Member]
Class of Stock Disclosures [Abstract]
Issuance of common stock, net (in shares)			240,571
Warrants to purchase shares of common stock (in shares)			482,146
Exercise price of warrants (in dollars per share) | $ / shares			$ 14
Gross proceeds before deducting placement agent fees and commissions and offering expenses | $			$ 2,700
Issuance of common stock for pre-funded warrants (in shares)			80,854
Common stock offering price per share (in dollars per share) | $ / shares			$ 8.4
Number of warrants included in each unit | Warrant			1
Warrants to purchase common shares (in shares)			1.50
Warrant expiry period			5 years									5 years
Gross proceeds before deducting the placement agent fees and other offering expenses | $			$ 2,700
Warrants to Purchase Common Stock [Member] | April 2024 Offering [Member]
Class of Stock Disclosures [Abstract]
Warrants to purchase common shares (in shares)			1
Number of trading days			5 days									5 days
Floor price per share (in dollars per share) | $ / shares			$ 0.06							$ 0.06		$ 0.06
Supply Agreement [Member] | Maximum [Member]
Class of Stock Disclosures [Abstract]
Period for ultrafiltration services												10 years
Supply Agreement [Member] | DaVita Warrant [Member]
Class of Stock Disclosures [Abstract]
Warrants to purchase shares of common stock (in shares)							36,830
Common stock, par value (in dollars per share) | $ / shares							$ 0.0001
Exercise price of warrants (in dollars per share) | $ / shares							$ 115.49
Number of tranches | Tranches							4
Number of warrants vested (in shares)												0
Supply Agreement [Member] | DaVita Warrant [Member] | Tranche One [Member]
Class of Stock Disclosures [Abstract]
Percentage of warrants expected to vest							25.00%
Supply Agreement [Member] | DaVita Warrant [Member] | Tranche Two [Member]
Class of Stock Disclosures [Abstract]
Percentage of warrants expected to vest							25.00%
Period of warrants expected to vest												12 months
Supply Agreement [Member] | DaVita Warrant [Member] | Tranche Three [Member]
Class of Stock Disclosures [Abstract]
Percentage of warrants expected to vest							25.00%
Period of warrants expected to vest												24 months
Supply Agreement [Member] | DaVita Warrant [Member] | Tranche Four [Member]
Class of Stock Disclosures [Abstract]
Percentage of warrants expected to vest							25.00%
Period of warrants expected to vest												36 months
Supply Agreement [Member] | DaVita Warrant [Member] | Maximum [Member]
Class of Stock Disclosures [Abstract]
Warrants to be exercised for amount of shares ownership percentage in entity							19.90%
Subsequent Event [Member] | April 2024 Offering [Member]
Class of Stock Disclosures [Abstract]
Warrants to purchase shares of common stock (in shares)															2,710,734
Exercise price of warrants (in dollars per share) | $ / shares															$ 2.49
Subsequent Event [Member] | Warrants to Purchase Common Stock [Member] | April 2024 Offering [Member]
Class of Stock Disclosures [Abstract]
Warrants to purchase shares of common stock (in shares)															2,710,734
Exercise price of warrants (in dollars per share) | $ / shares															$ 2.49
Series F Convertible Preferred Stock [Member]
Class of Stock Disclosures [Abstract]
Number of consecutive trading days considered for expiration												20 days
Number of consecutive trading days												30 days
Percentage of volume weighted average price of common stock									300.00%
Trading volume for each trading day | $									$ 7,000
Preferred stock, shares outstanding (in shares)										127		127		127
Preferred stock, par value (in dollars per share) | $ / shares										$ 0.0001		$ 0.0001		$ 0.0001
Series F Convertible Preferred Stock [Member] | Minimum [Member]
Class of Stock Disclosures [Abstract]
Aggregate cash fee paid to underwriter or placement agent								7.00%
Series F Convertible Preferred Stock [Member] | Maximum [Member]
Class of Stock Disclosures [Abstract]
Aggregate cash fee paid to underwriter or placement agent								8.00%
Series F Convertible Preferred Stock [Member] | Subsequent Event [Member]
Class of Stock Disclosures [Abstract]
Conversion price (in dollars per share) | $ / shares																$ 235.85
Series J Convertible Preferred Stock [Member] | October 2023 Offering [Member]
Class of Stock Disclosures [Abstract]
Issuance of common stock, net (in shares)						150,000
Warrants to purchase shares of common stock (in shares)						0.5
Number of shares in one unit (in shares)						1
Original issue discount percentage						40.00%
Additional shares issuable upon declaration of dividends (in shares)						362,933
Common stock offering price per share (in dollars per share) | $ / shares						$ 15
Preferred stock, par value (in dollars per share) | $ / shares						$ 0.0001
Number of warrants included in each unit						1
Common Stock [Member]
Class of Stock Disclosures [Abstract]
Issuance of common stock, net (in shares)										321,417	18,781
Common Stock [Member] | Series J Convertible Preferred Stock [Member] | October 2023 Offering [Member]
Class of Stock Disclosures [Abstract]
Common stock, par value (in dollars per share) | $ / shares						$ 0.0001
Warrants [Member]
Class of Stock Disclosures [Abstract]
Common stock warrant liability | $				$ 7,800						$ 8,000		$ 8,000
Increase in warrant liability | $												$ 200
Warrants [Member] | October 2023 Offering [Member]
Class of Stock Disclosures [Abstract]
Gross proceeds before deducting placement agent fees and commissions and offering expenses | $				2,250
Net proceeds after deducting placement agent fees and commissions and offering expenses | $				$ 1,500
Financing expense | $					$ 2.7
Warrants [Member] | Series J Convertible Preferred Stock [Member] | October 2023 Offering [Member]
Class of Stock Disclosures [Abstract]
Warrants to purchase shares of common stock (in shares)				0.5
Exercise price of warrants (in dollars per share) | $ / shares				$ 262.5
Warrants term										3 years		3 years