| Property, Plant and Equipment [Table Text Block] |
| | | As of December 31, | |
| | | 2021 | | | 2020 | |
| Laboratory equipment | | $ | 4,406 | | | $ | 4,406 | |
| Leasehold improvements | | | 5,838 | | | | 4,616 | |
| Computer equipment and software | | | 1,589 | | | | 1,724 | |
| Construction in process | | | 13,805 | | | | 14,101 | |
| Tooling | | | 826 | | | | 1,109 | |
| Furniture and fixtures | | | 250 | | | | 292 | |
| | | | 26,714 | | | | 26,248 | |
| Less accumulated depreciation and amortization | | | (10,786 | ) | | | (10,589 | ) |
| Property and equipment, net | | $ | 15,928 | | | $ | 15,659 | |
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