Summary of significant accounting policies - Additional Information (Detail)
|
|
12 Months Ended |
|
Jul. 06, 2021
USD ($)
$ / shares
shares
|
Dec. 31, 2021
USD ($)
Segment
|
Dec. 31, 2020
USD ($)
|
| Financing Sources [Line Items] |
|
|
|
| Re-measurement gain (loss) |
|
$ (6,000)
|
$ 121,000
|
| Number of reportable segments | Segment |
|
1
|
|
| Revenue from collaborations |
|
$ 4,359,000
|
|
| Revenue |
|
0
|
|
| Property and equipment, net |
|
$ 6,180,000
|
8,007,000
|
| Cash equivalent qualification, description |
|
The Company considers all highly liquid investments purchased with original maturities of 90 days or less at acquisition to be cash equivalents.
|
|
| Restricted cash |
|
$ 164,000
|
$ 560,000
|
| Investments, maturity period |
|
1 year 6 months
|
1 year 6 months
|
| Other than temporary impairment losses, investments |
|
$ 0
|
$ 0
|
| Impairment of long lived assets |
|
0
|
0
|
| Royalties due |
|
0
|
|
| Expenses on milestone payments |
|
500,000
|
|
| Dividends, common stock, cash |
|
$ 0
|
|
| Expected dividend yield |
|
0.00%
|
|
| Percentage of expected average remaining working lives of employees |
|
10.00%
|
|
| Research and Development |
|
|
|
| Financing Sources [Line Items] |
|
|
|
| Expenses on milestone payments |
|
|
4,500,000
|
| Follow-on Offering |
|
|
|
| Financing Sources [Line Items] |
|
|
|
| Stock issued during the period new issues shares | shares |
4,400,000
|
|
|
| Sale of stock issue price per share | $ / shares |
$ 19.00
|
|
|
| Sale of stock net consideration received on the transaction |
$ 7,770,000
|
|
|
| Follow-on Offering | Other Noncurrent Assets [Member] |
|
|
|
| Financing Sources [Line Items] |
|
|
|
| Deferred offering costs |
|
$ 0
|
0
|
| US |
|
|
|
| Financing Sources [Line Items] |
|
|
|
| Property and equipment, net |
|
5,000,000.0
|
6,600,000
|
| Belgium |
|
|
|
| Financing Sources [Line Items] |
|
|
|
| Property and equipment, net |
|
$ 1,200,000
|
$ 1,400,000
|