Annual report pursuant to Section 13 and 15(d)

STOCK-BASED COMPENSATION - Summary of Stock-based Compensation Expense (Details)

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STOCK-BASED COMPENSATION - Summary of Stock-based Compensation Expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]      
Stock-based compensation expense $ 4,455 $ 3,519 $ 5,884
Capitalized stock-based compensation 657 605 912
Selling and marketing      
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]      
Stock-based compensation expense 72 94 85
General and administrative      
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]      
Stock-based compensation expense 1,704 1,044 964
Research and development      
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]      
Stock-based compensation expense $ 2,679 $ 2,381 $ 4,835