Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenues	$ 5,720	$ 4,884	$ 10,700	$ 8,900
Percentage of revenue from revenue streams	100.00%	100.00%	100.00%	100.00%
Communication
Revenues	$ 3,510	$ 3,014	$ 6,697	$ 5,422
Percentage of revenue from revenue streams	61.40%	61.70%	62.60%	60.90%
Compliance
Revenues	$ 2,210	$ 1,870	$ 4,003	$ 3,478
Percentage of revenue from revenue streams	38.60%	38.30%	37.40%	39.10%