REVENUE RECOGNITION - Summary of Disaggregated Revenue by Primary Geographical Market and Timing of Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net revenues	$ 210,032	$ 180,057	$ 134,094	$ 100,150	$ 92,289	$ 78,002	$ 75,896	$ 69,972	$ 624,333	$ 316,159	$ 286,166
Products delivered at a point in time
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net revenues									584,556	270,778
Products and services delivered over time
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net revenues									39,777	45,381
United States
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net revenues									523,577	219,600	199,565
International
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net revenues									$ 100,756	$ 96,559	$ 86,601