Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Net revenue	$ 48,578	$ 45,790	$ 139,908	$ 143,542
Variable consideration
Disaggregation of Revenue [Line Items]
Net revenue	34,499	33,188	101,848	103,367
Fixed consideration
Disaggregation of Revenue [Line Items]
Net revenue	14,079	12,602	38,060	40,175
NALA
Disaggregation of Revenue [Line Items]
Net revenue	27,215	27,204	78,064	83,235
EMEA
Disaggregation of Revenue [Line Items]
Net revenue	13,529	11,984	39,616	38,837
APJ
Disaggregation of Revenue [Line Items]
Net revenue	7,834	6,602	22,228	21,470
Selling services
Disaggregation of Revenue [Line Items]
Net revenue	47,746	44,840	137,683	140,558
Professional services
Disaggregation of Revenue [Line Items]
Net revenue	$ 832	$ 950	$ 2,225	$ 2,984