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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 |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 28, 2019 | Dec. 31, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Feb. 28, 2018 | Feb. 08, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Monthly Average Closing Price, Common Stock, Threshold | $ 33.52 | $ 10.83 |  |  |  |  |  |
Stock Issued During Period, Shares, Employee Stock Purchase Plans |  |  |  |  | 93,584 |  |  |
Number of shares authorized (in shares) |  |  |  |  |  |  |  | 1,875,000
Number of shares authorized, annual increase |  | 5.00% |  |  |  |  |  |
Total stock-based compensation expense |  |  | $ 7,486 | $ 5,723 | $ 12,266 | $ 16,968 |  |
Delivery costs |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |  |  |  |  |
Total stock-based compensation expense |  |  | 176 | 203 | 539 | 471 |  |
Sales and marketing expense |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |  |  |  |  |
Total stock-based compensation expense |  |  | 1,432 | 1,939 | 3,091 | 5,550 |  |
Research and development expense |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |  |  |  |  |
Total stock-based compensation expense |  |  | 638 | 915 | 1,204 | 3,141 |  |
General and administration expense |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |  |  |  |  |
Total stock-based compensation expense |  |  | $ 5,240 | $ 2,666 | $ 7,432 | $ 7,806 |  |
ESPP |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |  |  |  |  |
ESPP, number of shares authorized, annual increase (in shares) |  |  | 500,000 |  | 500,000 |  |  |
Number of shares authorized, annual increase |  | 1.00% |  |  |  |  |  |
2018 Employee Stock Purchase Plan [Member] | ESPP |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |  |  |  |  |
Number of shares authorized (in shares) |  |  |  |  |  |  | 375,000 |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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