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Organization and Operations - Additional Information (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Jan. 01, 2022
Sep. 30, 2020
Dec. 31, 2021
Dec. 31, 2020
Basis Of Presentation And New Accounting Standards [Line Items]        
Proceeds from sale of common stock     $ 18,675 $ 4,007
Sale of common stock, net     18,581 3,882
Net loss     (13,399) (8,241)
Accumulated deficit     (446,910) (433,511)
Net cash used in operating activities     (10,280) (8,434)
Cash and cash equivalents     $ 18,400 $ 8,346
Common Stock [Member]        
Basis Of Presentation And New Accounting Standards [Line Items]        
Common stock issued (in shares)     7,864,379 2,150,113
Sale of common stock, net     $ 8 $ 2
Lincoln Park Capital Fund, LLC [Member] | 2020 Repurchase Agreement [Member] | Common Stock [Member]        
Basis Of Presentation And New Accounting Standards [Line Items]        
Proceeds from sale of common stock     $ 12,500 $ 700
Common stock issued (in shares)     5,685,186 353,113
Sale of common stock, net   $ 25,000    
Period exercisable from the date of issuance   36 months    
Lincoln Park Capital Fund, LLC [Member] | 2020 Repurchase Agreement [Member] | Common Stock [Member] | Commitment Fee [Member]        
Basis Of Presentation And New Accounting Standards [Line Items]        
Common stock issued (in shares)       180,701
Subsequent Event [Member] | Lincoln Park Capital Fund, LLC [Member] | 2020 Repurchase Agreement [Member] | Common Stock [Member]        
Basis Of Presentation And New Accounting Standards [Line Items]        
Proceeds from sale of common stock $ 7,000      
Common stock issued (in shares) 5,665,000      
Remaining common stock issued and sold (in shares) 0