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Commitments and Contingencies - Additional Information (Detail) - USD ($) | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2020 | Aug. 31, 2018 | May 31, 2018 | Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2019 | Sep. 30, 2018 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Obligation expiration year |  |  |  |  |  |  |  | 2021 |  |  |
Gain (loss) on strategic investment |  |  |  |  |  |  |  | $ (1,060,000) | $ (241,000) |  |
Restricted cash |  |  |  | $ 5,770,000 |  | $ 4,787,000 |  | 5,770,000 | 4,787,000 | $ 4,787,000 | $ 4,826,000
Letter of Credit | Corporate Credit Card Program |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restricted cash |  |  |  | 2,000,000.0 |  |  |  | 2,000,000.0 |  |  |
Letter of Credit | Fleet Program |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restricted cash |  |  |  | 400,000 |  |  |  | 400,000 |  |  |
Other assets |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate carrying amount of strategic equity investment |  |  |  | 1,200,000 |  |  |  | 1,200,000 |  | $ 2,300,000 |
Other expense |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on strategic investment |  |  |  | 400,000 |  | $ (12,000) |  | $ (1,100,000) | $ (200,000) |  |
Exclusivity Deed | Neuren |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate carrying amount of strategic equity investment |  |  | $ 3,100,000 |  |  |  |  |  |  |  |
Shares subscribed |  |  | 1,330,000 |  |  |  |  |  |  |  |
Exclusivity Deed | Neuren | Selling, general and administrative |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Payments for exclusive right |  |  | $ 900,000 |  |  |  |  |  |  |  |
License Agreements | Neuren | North America |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Upfront license fee | $ 10,000,000.0 | $ 10,000,000.0 |  |  |  |  |  |  |  |  |
License Agreements | Neuren | Research and development | North America |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Upfront payment |  |  |  |  | $ 10,000,000.0 |  | $ 10,000,000.0 |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of royalty payments obligation on net product sales |  |  |  |  |  |  |  | 2.00% |  |  |
Mile stone payments payable |  |  |  | $ 1,100,000,000 |  |  |  | $ 1,100,000,000 |  |  |
Maximum | License Agreements | Neuren | North America |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Mile stone payments payable | $ 515,000,000.0 | $ 455,000,000.0 |  |  | $ 515,000,000.0 |  |  |  |  |  |

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