Segment and Geographic Information - Summary of Revenues Based on Location of Customers (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues	$ 1,169	$ 1,464
United States
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues	722	1,168
India
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues	7	90
Africa
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues	182	115
Canada
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues	$ 258	$ 91