Basis of Presentation and Summary of Significant Accounting Policies - Financial Instruments (Details) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended				3 Months Ended			9 Months Ended
	Dec. 16, 2021	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021	Jan. 31, 2020	Sep. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Class of Stock [Line Items]
Amount paid for clearing fees				$ 18
Offering costs paid on the issuance of common stock and warrants						$ 0		$ 1	$ 334	$ 470
Warrants issued (in shares)									229,414	310,860
Proceeds from the exercise of warrants						$ 0		$ 0	$ 0	$ 527
June 2022 Private Placement
Class of Stock [Line Items]
Sale of common stock (in shares)		1,313,462
Sale of common stock (USD per share)						$ 1.30			$ 1.30
Securities called by warrants (in shares)						2,692,310			2,692,310
Exercise price of common stock (USD per share)						$ 1.30			$ 1.30
Amount paid for placement agent commissions		$ 252
Amount paid related to expenses for registered direct offering and concurrent private placement		35
Amount paid for clearing fees		47
Offering costs paid on the issuance of common stock and warrants		334
Proceeds from sale of common stock and warrants		$ 3,200
Estimated proceeds from issuance of warrants						$ 3,500
June 2022 Private Placement | Pre-Funded Warrants
Class of Stock [Line Items]
Securities called by warrants (in shares)						1,378,848			1,378,848
Exercise price of common stock (USD per share)						$ 0.0001			$ 0.0001
June 2022 Private Placement | Warrants
Class of Stock [Line Items]
Securities called by warrants (in shares)						2,692,310			2,692,310
Exercise price of common stock (USD per share)						$ 1.30			$ 1.30
December 2021 Private Placement
Class of Stock [Line Items]
Sale of common stock (in shares)			1,193,185
Sale of common stock (USD per share)			$ 3.52
Securities called by warrants (in shares)						1,278,413			1,278,413
Exercise price of common stock (USD per share)						$ 3.52			$ 3.52
Amount paid for placement agent commissions			$ 360
Amount paid related to expenses for registered direct offering and concurrent private placement			42
Amount paid for clearing fees			97
Offering costs paid on the issuance of common stock and warrants			499
Proceeds from sale of common stock and warrants			$ 4,000
Estimated proceeds from issuance of warrants						$ 4,500
December 2021 Private Placement | Pre-Funded Warrants
Class of Stock [Line Items]
Securities called by warrants (in shares)			85,228
Exercise price of common stock (USD per share)			$ 0.0001
Warrants issued (in shares)	85,228
December 2021 Private Placement | Warrants
Class of Stock [Line Items]
Securities called by warrants (in shares)			1,278,413
Exercise price of common stock (USD per share)			$ 3.52
Investor Warrants
Class of Stock [Line Items]
Sale of common stock (in shares)				990,100
Sale of common stock (USD per share)				$ 5.05
Exercise price of common stock (USD per share)					$ 3.37
Amount paid for placement agent commissions				$ 400
Amount paid related to expenses for registered direct offering and concurrent private placement				51
Offering costs paid on the issuance of common stock and warrants							$ 469
Proceeds from sale of common stock and warrants				$ 4,500
Warrants issued (in shares)						187,734		269,180
January 2020 Institutional Investor
Class of Stock [Line Items]
Sale of common stock (in shares)					688,360
Sale of common stock (USD per share)					$ 3.3700
Securities called by warrants (in shares)					688,360
Purchase price (USD per share)					$ 0.625
January 2020 Equity Offering, Private Placement
Class of Stock [Line Items]
Securities called by warrants (in shares)					48,185
Exercise price of common stock (USD per share)					$ 4.9940
Warrants issued (in shares)						41,680		41,680
January 2020 Equity Offering
Class of Stock [Line Items]
Exercise price of common stock (USD per share)						$ 3.67		$ 3.59	$ 3.67	$ 3.59
Amount paid for placement agent commissions					$ 193
Amount paid related to expenses for registered direct offering and concurrent private placement					50
Amount paid for clearing fees					231
Offering costs paid on the issuance of common stock and warrants							$ 510
Proceeds from sale of common stock and warrants					$ 2,300
Estimated proceeds from issuance of warrants									$ 800
Warrants issued (in shares)						229,414		310,860
Warrants exercised (in shares)									0	(156,446)