Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended		39 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Mar. 31, 2018
Income Statement [Abstract]
NET REVENUE	$ 40,603	$ 24,672	$ 88,817	$ 53,576			$ 6,200
COST OF GOODS SOLD	23,076	14,262	52,859	35,919
GROSS PROFIT	17,527	10,410	35,958	17,657
OPERATING EXPENSES:
Sales and distribution	18,111	11,560	41,094	28,516
Research and development	3,226	790	7,731	2,810
General and administrative	10,261	2,767	23,932	8,103
TOTAL OPERATING EXPENSES:	31,598	15,117	72,757	39,429
OPERATING LOSS	(14,071)	(4,707)	(36,799)	(21,772)	$ 29,400	$ 22,600
INTEREST EXPENSE—net	875	439	3,368	1,503
OTHER EXPENSE (INCOME)—net	21	(19)	53	(45)
LOSS BEFORE INCOME TAXES	(14,967)	(5,127)	(40,220)	(23,230)
PROVISION FOR INCOME TAXES	8		23	3
NET LOSS	$ (14,975)	$ (5,127)	$ (40,243)	$ (23,233)
Net loss per share, basic and diluted	$ (0.99)	$ (0.49)	$ (3.10)	$ (2.40)
Weighted-average number of shares outstanding, basic and diluted	15,134,422	10,532,926	12,971,641	9,687,078