Inventory (Tables)

3 Months Ended

12 Months Ended

Mar. 31, 2020

Dec. 31, 2019

Inventory Disclosure [Abstract]

Schedule of inventory

Inventory consists of the following as of March 31, 2020 and December 31, 2019 (in thousands):

	As of
	March 31, 2020		December 31, 2019
Raw materials	$	436	$	412
Work in process	440		258
Finished goods	209		320
Total	$	1,085	$	990

Inventory consists of the following as of December 31, 2019 and 2018 (in thousands):

	As of December 31,
	2019		2018
Raw materials	$	412	$	258
Work in process	258		270
Finished goods	320		324
Total	$	990	$	852