Fair value measurements - Summary of Warrants (Detail) - Warrant - USD ($) |
3 Months Ended | 12 Months Ended | ||||||
|---|---|---|---|---|---|---|---|---|
Nov. 13, 2019 |
Nov. 05, 2019 |
Dec. 31, 2020 |
Sep. 30, 2020 |
Jun. 30, 2020 |
Mar. 31, 2020 |
Dec. 31, 2020 |
Dec. 31, 2019 |
|
| Class of Warrant or Right [Line Items] | ||||||||
| Beginning Balance | $ 34,042,250 | $ 25,427,625 | $ 16,413,500 | $ 21,807,000 | $ 21,807,000 | $ 0 | ||
| Initial measurement | $ 13,037,500 | 13,037,500 | ||||||
| Change in valuation inputs or other assumptions | 1,689,625 | 8,614,625 | 9,014,125 | (5,393,000) | 13,924,875 | 6,999,875 | ||
| Ending Balance | 35,731,875 | 34,042,250 | 25,427,625 | 16,413,500 | 35,731,875 | 21,807,000 | ||
| Private Placement | ||||||||
| Class of Warrant or Right [Line Items] | ||||||||
| Beginning Balance | 11,904,750 | 8,824,500 | 5,661,000 | 7,575,750 | 7,575,750 | 0 | ||
| Initial measurement | 4,650,000 | 4,650,000 | ||||||
| Change in valuation inputs or other assumptions | 582,750 | 3,080,250 | 3,163,500 | (1,914,750) | 4,911,750 | 2,414,250 | ||
| Ending Balance | 12,487,500 | 11,904,750 | 8,824,500 | 5,661,000 | 12,487,500 | 7,575,750 | ||
| Public Warrants | ||||||||
| Class of Warrant or Right [Line Items] | ||||||||
| Beginning Balance | 22,137,500 | 16,603,125 | 10,752,500 | 14,231,250 | 14,231,250 | 0 | ||
| Initial measurement | $ 8,387,500 | 8,387,500 | ||||||
| Change in valuation inputs or other assumptions | 1,106,875 | 5,534,375 | 5,850,625 | (3,478,750) | 9,013,125 | 4,585,625 | ||
| Ending Balance | $ 23,244,375 | $ 22,137,500 | $ 16,603,125 | $ 10,752,500 | $ 23,244,375 | 14,231,250 | ||
| Over-Allotment Option | ||||||||
| Class of Warrant or Right [Line Items] | ||||||||
| Initial measurement | $ 1,769,625 | 1,769,625 | ||||||
| Over-Allotment Option | Private Placement | ||||||||
| Class of Warrant or Right [Line Items] | ||||||||
| Initial measurement | 511,500 | 511,500 | ||||||
| Over-Allotment Option | Public Warrants | ||||||||
| Class of Warrant or Right [Line Items] | ||||||||
| Initial measurement | $ 1,258,125 | $ 1,258,125 | ||||||