Inventory (Tables)

9 Months Ended

12 Months Ended

Sep. 30, 2019

Dec. 31, 2018

Inventory Disclosure [Abstract]

Schedule of Inventory

Inventory consisted of the following as of December 31, 2018 and September 30, 2019:

	December 31, 2018		September 30, 2019
	(in thousands)
Inventory on-hand	$	24,595	$	20,214
Inventory in-transit		5,957		5,694
Inventory	$	30,552	$	25,908

Inventory consisted of the following as of December 31, 2017 and 2018:

	December 31, 2017		December 31, 2018
Inventory on-hand	$	15,703	$	24,595
Inventory in-transit		4,875		5,957
Inventory	$	20,578	$	30,552