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Borrowings - Senior Note - Additional Information (Detail)
1 Months Ended 6 Months Ended
Jun. 24, 2020
shares
Aug. 06, 2019
d
$ / shares
Aug. 31, 2019
USD ($)
$ / shares
shares
Jun. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Debt Instrument [Line Items]          
Principal amount       $ 122,600,000  
Bruce & Co.,Inc.          
Debt Instrument [Line Items]          
Principal amount       18,700  
2021 Notes          
Debt Instrument [Line Items]          
Senior convertible notes outstanding       $ 7,600,000 $ 10,200,000
2021 Notes | Bruce & Co.,Inc.          
Debt Instrument [Line Items]          
Senior notes, effective interest rate     5.75%    
2021 Notes | Privately Negotiated Exchange Agreement | Bruce & Co.,Inc.          
Debt Instrument [Line Items]          
Repayments of aggregate principal amount     $ 1,500,000    
Issuance of common stock to note holders | shares     4,017,857    
Exchange price per share | $ / shares     $ 1.12    
2024 Convertible Notes          
Debt Instrument [Line Items]          
No of convertible shares   333.3333      
Principal amount per share | $ / shares   $ 1,000      
Conversion price of shares | $ / shares   $ 3.00      
Debt default, description       If certain bankruptcy and insolvency-related events of default occur, the principal of, and accrued and unpaid interest on, all of the then outstanding 2024 convertible notes shall automatically become due and payable. If an event of default other than certain bankruptcy and insolvency-related events of defaults occurs and is continuing, the Trustee or the holders of at least 25% in aggregate principal amount of the then-outstanding 2024 convertible notes, by written notice to the Trustee, may declare the 2024 convertible notes due and payable at their principal amount plus any accrued and unpaid interest, and thereupon the Trustee may, at its discretion, proceed to protect and enforce the rights of the holders by the appropriate judicial proceedings. Notwithstanding the foregoing, the Indenture provides that, to the extent the Company elects, the sole remedy for an event of default relating to certain failures by the Company to comply with certain reporting covenants in the Indenture will, for the first 180 days after such event of default, consist exclusively of the right to receive additional interest on the 2024 convertible notes.  
Percentage of repurchase price   100.00%      
Debt Instrument, redemption description       The Company may elect at its option to cause all or any portion of the 2024 convertible notes to be mandatorily converted in whole or in part at any time prior to the close of business on the business day immediately preceding the maturity date, if the last reported sale price of its common stock equals or exceeds 120% of the conversion price then in effect for at least 10 trading days in any 20 trading day period, ending within five business days prior to the date of the mandatory conversion notice.  
Percentage of conversion price equaling stock price   120.00%      
Number of trading days | d   10      
Consecutive trading days   20 days      
2024 Convertible Notes | Bruce & Co.,Inc.          
Debt Instrument [Line Items]          
Senior notes, effective interest rate   5.75%      
Principal amount     $ 5,000,000.0    
Debt instrument, maturity date, description       The 2024 convertible notes will mature on the earlier of (i) November 4, 2024 or (ii) the 91st day after the payment in full of, and termination and discharge of all obligations (other than contingent indemnity obligations) under the MidCap Credit Facility.  
2024 Convertible Notes | Privately Negotiated Exchange Agreement | Bruce & Co.,Inc.          
Debt Instrument [Line Items]          
Senior notes, effective interest rate     5.75%    
June 2020 Note [Member] | Bruce & Co.,Inc.          
Debt Instrument [Line Items]          
Principal amount     $ 2,600,000    
Maturity date     Jun. 30, 2020    
Issuance of common stock pursuant to conversion notes (in shares) | shares 1,235,094        
December 2020 Note [Member] | Bruce & Co.,Inc.          
Debt Instrument [Line Items]          
Principal amount     $ 2,600,000    
Maturity date     Dec. 31, 2020