Revenue Recognition - Disaggregation of Revenues (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Total revenue	$ 25,976	$ 22,067
Deposits revenue
Disaggregation of Revenue [Line Items]
Total revenue	15,616	14,651
Identity verification revenue
Disaggregation of Revenue [Line Items]
Total revenue	10,360	7,416
Transferred at Point in Time | Deposits software and hardware
Disaggregation of Revenue [Line Items]
Total revenue	10,755	10,283
Transferred at Point in Time | Identity verification software and hardware
Disaggregation of Revenue [Line Items]
Total revenue	1,548	1,232
Transferred over Time | Deposits services and other
Disaggregation of Revenue [Line Items]
Total revenue	4,861	4,368
Transferred over Time | Identity verification services and other
Disaggregation of Revenue [Line Items]
Total revenue	$ 8,812	$ 6,184