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Borrowings - Mann Group Promissory Notes - Additional Information (Detail) |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Aug. 06, 2019 USD ($) | Aug. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) $ / shares shares
Debt Instrument [Line Items] |  |  |  |
Common stock, shares issued | shares |  |  | 211,787,573 | 187,029,967
Principal amount |  |  | $ 120,300,000 |
Gain (loss) on extinguishment of debt | $ 3,100,000 |  | 3,529,000 | $ (765,000)
The Mann Group LLC |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Gain (loss) on extinguishment of debt |  | $ 400,000 |  |
Unamortized debt issuance costs and debt discount |  |  | 0 | $ 600,000
The Mann Group LLC | Convertible Promissory Note |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Repayments of debt |  |  | $ 11,000,000 |
Conversion price of shares | $ / shares |  |  | $ 2.50 | $ 4.00
Principal amount |  |  | $ 35,000,000 | $ 71,500,000
Accrued Paid-in-Kind Interest |  |  | $ 1,000,000 | $ 6,800,000
Senior notes, effective interest rate |  |  | 7.00% | 5.84%
Maturity date |  |  | Nov. 30, 2024 | Jul. 31, 2021
The Mann Group LLC | Non-Convertible Promissory Note |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal amount |  |  | $ 35,100,000 |
Accrued Paid-in-Kind Interest |  |  | $ 1,000,000 |
Senior notes, effective interest rate |  |  | 7.00% |
Maturity date |  |  | Nov. 30, 2024 |
The Mann Group LLC | New Loan Arrangement | Convertible Promissory Note |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Conversion price of shares | $ / shares |  | $ 2.50 | $ 2.50 |
Principal amount |  |  | $ 35,000,000 |
Senior notes, effective interest rate |  | 7.00% |  |
Debt instrument payment term description |  |  | quarterly |
Debt instrument, date of first required interest payment |  | Oct. 01, 2019 |  |
Maturity date |  | Nov. 03, 2024 |  |
No of convertible shares |  | 400 |  |
Principal amount per share | $ / shares |  | $ 1,000 |  |
The Mann Group LLC | New Loan Arrangement | Non-Convertible Promissory Note |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal amount |  |  | $ 35,100,000 |
Senior notes, effective interest rate |  | 7.00% |  |
Debt instrument payment term description |  |  | quarterly |
Debt instrument, date of first required interest payment |  | Oct. 01, 2019 |  |
Debt instrument, maturity date, description |  |  | The Mann Group non-convertible note will mature on the earlier of (i) November 3, 2024 or (ii) the 90th day after the repayment in full, and termination and discharge of all obligations (other than contingent indemnity obligations) under the MidCap Credit Facility. Interest on the Mann Group non-convertible note will be payable in kind by adding the amount thereof to the principal amount; provided that the Company may, at its option, elect to pay any such interest on any interest payment date, if certain conditions are met, in shares of the Company’s common stock at a price per shall equal to the last reported sale price on the trading day immediately prior to the interest payment date. |
The Mann Group LLC | Privately Negotiated Exchange Agreement |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Repayments of debt |  | $ 3,000,000 |  |
Common stock, shares issued | shares |  | 7,142,857 |  |
Conversion price of shares | $ / shares |  | $ 1.12 |  |
Conversion of notes to common shares, value |  | $ 71,500,000 |  |
Accrued Paid-in-Kind Interest |  | 9,500,000 |  |
The Mann Group LLC | Privately Negotiated Exchange Agreement | New Loan Arrangement | Convertible Promissory Note |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal amount |  | 35,000,000 |  |
The Mann Group LLC | Privately Negotiated Exchange Agreement | New Loan Arrangement | Non-Convertible Promissory Note |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal amount |  | $ 35,100,000 |  |

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