Inventories - Additional Information (Detail) - USD ($) |
3 Months Ended | 6 Months Ended | |||
---|---|---|---|---|---|
Jun. 30, 2020 |
Jun. 30, 2019 |
Jun. 30, 2020 |
Jun. 30, 2019 |
Dec. 31, 2019 |
|
Inventory [Line Items] | |||||
Write-off of inventory | $ 0 | $ 0 | $ 496,000 | $ 0 | |
Pre-launch Inventory | |||||
Inventory [Line Items] | |||||
Raw materials inventory | $ 800,000 | $ 800,000 | $ 800,000 |