| Cash, Cash Equivalents and Investments [Table Text Block] |
| |
|
Total |
|
|
Quoted prices in active markets (Level 1) |
|
|
Significant other observable inputs (Level 2) |
|
|
Significant unobservable inputs (Level 3) |
|
| September 30, 2024 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Money market funds, included in cash equivalents |
|
$ |
11,893 |
|
|
$ |
11,893 |
|
|
$ |
— |
|
|
$ |
— |
|
| Total |
|
$ |
11,893 |
|
|
$ |
11,893 |
|
|
$ |
— |
|
|
$ |
— |
|
| |
|
Total |
|
|
Quoted prices in active markets (Level 1) |
|
|
Significant other observable inputs (Level 2) |
|
|
Significant unobservable inputs (Level 3) |
|
| December 31, 2023 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Money market funds, included in cash equivalents |
|
$ |
13,224 |
|
|
$ |
13,224 |
|
|
$ |
— |
|
|
$ |
— |
|
| Investments - US treasuries |
|
|
8,970 |
|
|
|
8,970 |
|
|
|
— |
|
|
|
— |
|
| Total |
|
$ |
22,194 |
|
|
$ |
22,194 |
|
|
$ |
— |
|
|
$ |
— |
|
|
| |
|
Total |
|
|
Quoted prices in active markets (Level 1) |
|
|
Significant other observable inputs (Level 2) |
|
|
Significant unobservable inputs (Level 3) |
|
| December 31, 2023 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Money market funds, included in cash equivalents |
|
$ |
13,224 |
|
|
$ |
13,224 |
|
|
$ |
— |
|
|
$ |
— |
|
| Investments - US treasuries |
|
|
8,970 |
|
|
|
8,970 |
|
|
|
— |
|
|
|
— |
|
| Total |
|
$ |
22,194 |
|
|
$ |
22,194 |
|
|
$ |
— |
|
|
$ |
— |
|
| |
|
Total |
|
|
Quoted prices in active markets (Level 1) |
|
|
Significant other observable inputs (Level 2) |
|
|
Significant unobservable inputs (Level 3) |
|
| December 31, 2022 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Money market funds, included in cash equivalents |
|
$ |
17,618 |
|
|
$ |
17,618 |
|
|
$ |
— |
|
|
$ |
— |
|
| Investments - US treasuries |
|
|
3,573 |
|
|
|
3,573 |
|
|
|
— |
|
|
|
— |
|
| Investments - Foreign treasuries |
|
|
896 |
|
|
|
896 |
|
|
|
— |
|
|
|
— |
|
| Investments - Asset-backed securities |
|
|
499 |
|
|
|
— |
|
|
|
499 |
|
|
|
— |
|
| Investments - Corporate bonds |
|
|
15,566 |
|
|
|
— |
|
|
|
15,566 |
|
|
|
— |
|
| Total |
|
$ |
38,152 |
|
|
$ |
22,087 |
|
|
$ |
16,065 |
|
|
$ |
— |
|
|