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Borrowings - Schedule of Line of Credit Facility Debt and Key Terms (Detail) - USD ($) $ / shares in Units, $ in Millions | 9 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2021 | Mar. 04, 2021 | Dec. 31, 2020 | Apr. 10, 2020
Debt Instrument [Line Items] |  |  |  |  |  |
Amount Due |  | $ 288.4 |  |  |  |
Senior Convertible Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Amount Due |  | $ 230.0 |  |  |  |
Annual interest rate |  | 2.50% |  |  |  |
Maturity date |  | 2026-03 |  |  |  |
Conversion price |  | $ 5.21 |  | $ 5.21 |  |
MidCap Credit Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Amount Due | [1] | $ 40.0 |  |  | $ 50.0 |
Maturity date | [1] | 2025-08 |  |  |  |
MidCap Credit Facility | LIBOR |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Annual interest rate | [1] | 6.25% |  |  |  |
Interest rate floor | [1] | 1.00% |  |  |  |
5.75% 2024 Convertible Note |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Amount Due | [2] |  |  |  | 5.0 |
Annual interest rate | [2] | 5.75% |  |  |  |
Maturity date | [2] | 2024-11 |  |  |  |
Conversion price | [2] | $ 3.00 |  |  |  |
PPP Loan |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Amount Due | [3] |  |  |  | 4.9 |
Annual interest rate |  | 0.98% | [3] |  |  | 0.98%
Maturity date | [3] | 2022-04 |  |  |  |
Mann Group | Convertible Promissory Note |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Amount Due |  | $ 18.4 |  |  | 28.0 |
Accrued interest paid-in-kind |  | $ 0.3 |  |  | 0.6 |
Annual interest rate | [4] | 2.50% |  |  |  |
Maturity date | [4] | 2025-12 |  |  |  |
Conversion price |  | $ 2.50 |  |  |  |
Mann Group | Non Convertible Promissory Note |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Amount Due |  |  |  |  | 35.1 |
Accrued interest paid-in-kind |  |  |  |  | $ 3.6 |
Annual interest rate |  | 7.00% |  |  |  |
Maturity date |  | 2024-11 |  |  |  |
[1] | In April 2021, the Company prepaid $10.0 million principal balance and amended the MidCap credit facility. The interest rate prior to the amendment was one-month LIBOR (2% floor) plus 6.75% and the maturity date was in August 2024
[2] | In February 2021, the $5.0 million principal balance was converted into 1,666,667 shares of the Company’s common stock
[3] | In July 2021, the Company received full forgiveness from the SBA for the $4.9 million principal balance of the PPP loan and recognized a gain on extinguishment of debt for the full principal balance and a de minimis amount of accrued but unpaid interest
[4] | In April 2021, the Mann Group convertible note was amended. The interest rate prior to the amendment was 7.00% and the maturity date was in November 2024

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