STOCK BASED COMPENSATION - Stock-based Compensation Expense (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
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Sep. 28, 2020 |
Dec. 31, 2020 |
Dec. 31, 2019 |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Total stock based compensation expenses | $ 1,800 | $ 8,006 | $ 5,215 |
| Research and development | |||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Total stock based compensation expenses | 3,276 | 2,713 | |
| General and administrative expenses | |||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Total stock based compensation expenses | 3,464 | 941 | |
| Sales and marketing expense | |||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Total stock based compensation expenses | 894 | 1,373 | |
| Cost of sales | |||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Total stock based compensation expenses | $ 372 | $ 188 | |
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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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