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Borrowings - Schedule of Line of Credit Facility Debt and Key Terms (Detail) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Debt Instrument [Line Items] |  |
Amount Due | $ 120.3 |
Convertible Promissory Note | The Mann Group LLC |  |
Debt Instrument [Line Items] |  |
Amount Due | 35.0 | $ 71.5
Accrued interest paid-in-kind | $ 1.0 | $ 6.8
Annual interest rate | 7.00% | 5.84%
Maturity date | Nov. 30, 2024 | Jul. 31, 2021
Conversion price | $ 2.50 | $ 4.00
Non-Convertible Promissory Note | The Mann Group LLC |  |
Debt Instrument [Line Items] |  |
Amount Due | $ 35.1 |
Accrued interest paid-in-kind | $ 1.0 |
Annual interest rate | 7.00% |
Maturity date | Nov. 30, 2024 |
June 2020 Note |  |
Debt Instrument [Line Items] |  |
Amount Due | $ 2.6 |
Maturity date | Jun. 30, 2020 |
5.75% 2024 Convertible Notes |  |
Debt Instrument [Line Items] |  |
Amount Due | $ 5.0 | $ 18.7
Annual interest rate | 5.75% | 5.75%
Maturity date | Nov. 30, 2024 | Oct. 31, 2021
Conversion price | $ 3.00 | $ 5.15
December 2020 Note |  |
Debt Instrument [Line Items] |  |
Amount Due | $ 2.6 |
Maturity date | Dec. 31, 2020 |
MidCap Credit Facility |  |
Debt Instrument [Line Items] |  |
Amount Due | $ 40.0 |
Maturity date | Aug. 31, 2024 |
MidCap Credit Facility | LIBOR |  |
Debt Instrument [Line Items] |  |
Annual interest rate | 6.75% |
Interest rate floor | 2.00% |
Deerfield Credit Facility | 9.75% Credit Facility Due July 2019 |  |
Debt Instrument [Line Items] |  |
Amount Due |  | $ 4.0
Annual interest rate |  | 9.75%
Maturity date |  | Jul. 31, 2019
Deerfield Credit Facility | 9.75% Credit Facility Due August 2019 |  |
Debt Instrument [Line Items] |  |
Amount Due |  | $ 5.0
Annual interest rate |  | 9.75%
Maturity date |  | Aug. 31, 2019
Deerfield Credit Facility | 8.75% Credit Facility Due May 2019 |  |
Debt Instrument [Line Items] |  |
Amount Due |  | $ 2.5
Annual interest rate |  | 8.75%
Maturity date |  | May 31, 2019

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