Stockholders' Deficit (Details) - USD ($) $ / shares in Units, $ in Thousands						3 Months Ended		12 Months Ended
	Jan. 18, 2024	Mar. 22, 2023	Mar. 19, 2023	Feb. 23, 2023	Dec. 02, 2021	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023	Dec. 07, 2023	Dec. 31, 2021
Subsidiary, Sale of Stock [Line Items]
Total shares of common stock from exercisable warrants outstanding (in shares)						32,344,212		36,344,212
Common stock, issued (in shares)						189,849,296		120,204,513
Common stock, par value (in dollars per share)						$ 0.001		$ 0.001
Issuance costs to additional paid in capital			$ 2,900
Proceeds from issuance of common stock, net of issuance costs						$ 90,672	$ 0
The Warrants
Subsidiary, Sale of Stock [Line Items]
Exercise price (in dollars per share)			$ 1.55
Pre Funded Warrant
Subsidiary, Sale of Stock [Line Items]
Total shares of common stock from exercisable warrants outstanding (in shares)						0
Fair value of warrants			$ 22,800
Warrants
Subsidiary, Sale of Stock [Line Items]
Warrants exercised (in shares)						4,000,000
Wainwright
Subsidiary, Sale of Stock [Line Items]
Total shares of common stock from exercisable warrants outstanding (in shares)					36,964,286
Exercise price (in dollars per share)					$ 9.00
Fair value of warrants					$ 61,900
Warrants expired (in shares)									27,940,074
Warrant Amendment Agreements
Subsidiary, Sale of Stock [Line Items]
Proceeds from stock offering, net		$ 55,500	1,200
Estimated offering expenses			$ 4,200
Total shares of common stock from exercisable warrants outstanding (in shares)						9,024,212		9,024,212
Exercise price (in dollars per share)		$ 1.55				$ 1.55				$ 9.00
Warrants issued for shares of common stock (in shares)			9,024,212
Additional consideration per amended warrant (in dollars per share)		$ 0.125
Proceeds from issuance of common stock, net of issuance costs			$ 51,300
Placement fees		$ 100
Proceeds from debt, net of issuance costs		$ 1,100
Securities Purchase Agreement
Subsidiary, Sale of Stock [Line Items]
Total shares of common stock from exercisable warrants outstanding (in shares)						23,320,000		27,320,000
Exercise price (in dollars per share)						$ 1.55
Common stock, issued (in shares)			12,205,000
Common stock purchasable under prefunded warrants (in shares)			20,965,747
Common stock purchasable under warrants (in shares)			33,170,747
Common stock, par value (in dollars per share)			$ 0.001
Securities Purchase Agreement | Common Stock And Accompanying Warrant
Subsidiary, Sale of Stock [Line Items]
Purchase price (in dollars per share)			1.675
Securities Purchase Agreement | Pre Funded Warrant And Accompanying Warrant
Subsidiary, Sale of Stock [Line Items]
Purchase price (in dollars per share)			$ 1.674
Commitment Offering
Subsidiary, Sale of Stock [Line Items]
Issued stock (in shares)	56,700,000
Price per share (in dollars per share)	$ 1.50
Proceeds from stock offering, net	$ 90,700
Estimated offering expenses	$ 7,100
Over-Allotment Option
Subsidiary, Sale of Stock [Line Items]
Issued stock (in shares)	8,505,000
Option period	30 days
At The Market Program
Subsidiary, Sale of Stock [Line Items]
Issued stock (in shares)						0	0	3,312,908
Proceeds from stock offering, net								$ 4,400
Aggregate offering price shares				$ 70,000
Payment of issuance costs								$ 400