STOCK BASED COMPENSATION - Stock-based Compensation Expense (Details) - USD ($) $ in Thousands |
3 Months Ended | |
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Mar. 31, 2021 |
Mar. 31, 2020 |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Total stock based compensation expenses | $ 2,217 | $ 1,259 |
| Research and development | ||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Total stock based compensation expenses | 916 | 713 |
| General and administrative expenses | ||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Total stock based compensation expenses | 839 | 237 |
| Sales and marketing expense | ||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Total stock based compensation expenses | 345 | 209 |
| Cost of sales | ||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Total stock based compensation expenses | $ 117 | $ 100 |
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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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