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STOCK-BASED COMPENSATION - Allocation of Stock-based Compensation (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Jan. 01, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Feb. 08, 2018
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Monthly Average Closing Price, Common Stock, Threshold |  |  | $ 70.57 |  |  |  |  |
Number of shares authorized (in shares) |  |  |  |  |  | 1,345,631 |  | 1,875,000
Total stock-based compensation expense | $ 11,578 | $ 7,486 | $ 24,811 | $ 12,266 |  |  |  |
Delivery costs |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |
Total stock-based compensation expense | 365 | 176 | 897 | 539 |  |  |  |
Sales and marketing expense |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |
Total stock-based compensation expense | 3,791 | 1,432 | 7,627 | 3,091 |  |  |  |
Research and development expense |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |
Total stock-based compensation expense | 1,510 | 638 | 3,514 | 1,204 |  |  |  |
General and administration expense |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |
Total stock-based compensation expense | $ 5,912 | $ 5,240 | $ 12,773 | $ 7,432 |  |  |  |
ESPP |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |
ESPP, number of shares authorized, annual increase (in shares) | 500,000 |  | 500,000 |  | 265,470,000 | 267,823,000 |  |
Number of shares authorized, annual increase |  |  |  |  |  |  | 1.00% |

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