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Subsequent Event - Exchange of 2021 Convertible Notes for 2024 Convertible Notes - Additional Information (Detail) | Aug. 06, 2019 USD ($) d PromissoryNote $ / shares shares | Jun. 30, 2019 USD ($) | Dec. 31, 2018 USD ($) | May 31, 2018 $ / shares | Oct. 31, 2017 USD ($) $ / shares
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Subsequent Event [Line Items] |  |  |  |  |
Principal amount |  | $ 99,200,000 |  |  |
Subsequent Event | Bruce & Co.,Inc. |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Number of non interest bearing promissory notes | PromissoryNote | 2 |  |  |  |
2021 Notes |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Principal amount |  | $ 18,700,000 | $ 18,700,000 |  | $ 23,700,000
Senior notes, effective interest rate |  |  |  |  | 5.75%
Conversion price of shares | $ / shares |  |  |  |  | $ 5.15
2021 Notes | Privately Negotiated Exchange Agreement |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Exchange price per share | $ / shares |  |  |  | $ 2.2567 |
2021 Notes | Subsequent Event | Privately Negotiated Exchange Agreement | Bruce & Co.,Inc. |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Cash repayment of senior notes under exchange agreement | $ 1,470,147 |  |  |  |
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 | Subsequent Event | Bruce & Co.,Inc. |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Principal amount | $ 5,000,000 |  |  |  |
Senior notes, effective interest rate | 5.75% |  |  |  |
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. |  |  |  |
No of convertible shares | 333.3333 |  |  |  |
Principal amount per share | $ / shares | $ 1,000 |  |  |  |
Conversion price of shares | $ / shares | $ 3.00 |  |  |  |
Debt Default Threshold Amount | $ 25,000,000 |  |  |  |
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. |  |  |  |
Percentage of repurchase price | 100.00% |  |  |  |
Percentage of conversion price equaling stock price | 120.00% |  |  |  |
Number of trading days | d | 10 |  |  |  |
Consecutive trading days | 20 days |  |  |  |
June 2020 Note | Subsequent Event | Bruce & Co.,Inc. |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Principal amount | $ 2,630,750 |  |  |  |
Maturity date | Jun. 30, 2020 |  |  |  |
December 2020 Note | Subsequent Event | Bruce & Co.,Inc. |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Principal amount | $ 2,630,750 |  |  |  |
Maturity date | Dec. 31, 2020 |  |  |  |

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