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STOCK-BASED COMPENSATION, Stock-based Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Stock-based Compensation Expense [Abstract] |  |
Stock-based compensation expense | $ 1,210 | $ 689
Employee Stock Purchase Plan [Member] |  |
Stock-based Compensation Expense [Abstract] |  |
Stock-based compensation expense | 1,085 | 431
Employee Stock Purchase Plan [Member] | ACM Shanghai [Member] |  |
Stock-based Compensation Expense [Abstract] |  |
Stock-based compensation expense | 85 | 86
Non-Employee Stock Purchase Plan [Member] |  |
Stock-based Compensation Expense [Abstract] |  |
Stock-based compensation expense | 40 | 172
Cost of Revenue [Member] |  |
Stock-based Compensation Expense [Abstract] |  |
Stock-based compensation expense | 71 | 45
Sales and Marketing Expense [Member] |  |
Stock-based Compensation Expense [Abstract] |  |
Stock-based compensation expense | 505 | 94
Research and Development Expense [Member] |  |
Stock-based Compensation Expense [Abstract] |  |
Stock-based compensation expense | 229 | 187
General and Administrative Expense [Member] |  |
Stock-based Compensation Expense [Abstract] |  |
Stock-based compensation expense | $ 405 | $ 363

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