Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenues	$ 5,465	$ 4,882	$ 16,165	$ 13,782
Percentage of revenue from revenue streams	100.00%	100.00%	100.00%	100.00%
Communication
Revenues	$ 3,686	$ 3,356	$ 10,383	$ 8,777
Percentage of revenue from revenue streams	67.40%	68.70%	64.20%	63.70%
Compliance
Revenues	$ 1,779	$ 1,526	$ 5,782	$ 5,005
Percentage of revenue from revenue streams	32.60%	31.30%	35.80%	36.30%