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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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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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