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Description of Business - Additional Information (Detail) - USD ($) |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Aug. 06, 2019 | Aug. 31, 2019 | Dec. 31, 2019 | Jun. 30, 2019 | Dec. 31, 2018
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] |  |  |  |  |
Accumulated deficit |  |  | $ (2,991,903,000) |  | $ (2,940,000,000)
Principal amount |  |  | 120,300,000 |  |
Cash and cash equivalents |  |  | 29,906,000 |  | 71,157,000
Short-term investments |  |  | 19,978,000 |  |
Remaining debt amount |  |  | 70,020,000 |  | 72,089,000
The Mann Group LLC |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] |  |  |  |  |
Remaining debt amount |  |  |  | $ 70,100,000 | 72,100,000
Facility Financing Obligation | Deerfield |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] |  |  |  |  |
Repayments of aggregate principal amount |  |  | 5,000,000 |  |
Convertible Promissory Note | The Mann Group LLC |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] |  |  |  |  |
Principal amount |  |  | 35,000,000 |  | $ 71,500,000
Repayments of debt |  |  | $ 11,000,000 |  |
Conversion price of shares |  |  | $ 2.50 |  | $ 4.00
Senior notes, effective interest rate |  |  | 7.00% |  | 5.84%
Convertible Promissory Note | The Mann Group LLC | New Loan Arrangement |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] |  |  |  |  |
Principal amount |  |  | $ 35,000,000 |  |
Conversion price of shares |  | $ 2.50 | $ 2.50 |  |
Senior notes, effective interest rate |  | 7.00% |  |  |
Non-Convertible Promissory Note | The Mann Group LLC |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] |  |  |  |  |
Principal amount |  |  | $ 35,100,000 |  |
Senior notes, effective interest rate |  |  | 7.00% |  |
Non-Convertible Promissory Note | The Mann Group LLC | New Loan Arrangement |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] |  |  |  |  |
Principal amount |  |  | $ 35,100,000 |  |
Senior notes, effective interest rate |  | 7.00% |  |  |
2021 Notes |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] |  |  |  |  |
Principal amount |  |  | 10,200,000 |  |
Repayments of aggregate principal amount |  |  | $ 8,500,000 |  |
Reducing senior subordinated interest rate, percentage |  |  | 5.75% |  |
June 2020 Note |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] |  |  |  |  |
Principal amount |  |  | $ 2,600,000 |  |
Maturity period, month and year |  |  | 2020-06 |  |
December 2020 Note |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] |  |  |  |  |
Principal amount |  |  | $ 2,600,000 |  |
Maturity period, month and year |  |  | 2020-12 |  |
2024 Convertible Notes |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] |  |  |  |  |
Principal amount |  |  | $ 5,000,000 |  |
Conversion price of shares |  |  | $ 3.00 |  |
Maturity period, month and year |  |  | 2024-11 |  |
Senior notes, effective interest rate |  |  | 5.75% |  |
MidCap Credit Facility |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] |  |  |  |  |
Principal amount |  |  | $ 40,000,000 |  |
Principal amount, credit facility |  | $ 75,000,000 |  |  |
Amount outstanding |  |  | 40,000,000 |  |
Amount available under credit facility |  | 35,000,000 |  |  |
Reducing senior subordinated interest rate, percentage | 2.00% |  |  |  |
MidCap Credit Facility | Tranche 2 |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] |  |  |  |  |
Amount available under credit facility |  | 10,000,000 |  |  |
Debt instrument, minimum target net revenue |  | 30,000,000 |  |  |
Minimum cash covenant | $ 15,000,000 |  | 15,000,000 |  |
MidCap Credit Facility | Tranche 3 |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] |  |  |  |  |
Amount available under credit facility |  | $ 25,000,000 |  |  |
Minimum cash covenant |  |  | $ 20,000,000 |  |

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