Revenue (Tables)

6 Months Ended

Mar. 31, 2020

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue

The following table summarizes our revenue by geographic location of our customers:

	Three months ended March 31,				Six months ended March 31,
($ in thousands)	2020		2019		2020		2019
North America, primarily the United States	$	57,374	$	48,869	$	104,910	$	95,204
Europe, Middle East & Africa	9,885		10,764		18,401		20,868
Rest of world	6,188		6,131		12,453		12,005
Total revenue	$	73,447	$	65,764	$	135,764	$	128,077

10. REVENUE (CONTINUED)

The following table summarizes our revenue by the timing of revenue recognition:

	Three months ended March 31,				Six months ended March 31,
($ in thousands)	2020		2019		2020		2019
Transferred at a point in time	$	66,765	$	60,725	$	123,065	$	118,188
Transferred over time	6,682		5,039		12,699		9,889
Total revenue	$	73,447	$	65,764	$	135,764	$	128,077

Contract with Customer, Asset and Liability

Changes in unearned revenue were:

($ in thousands)	Six months ended March 31, 2020
Unearned revenue, beginning of period	$	5,025
Billings	19,553
Revenue recognized	(15,876		)
Unearned revenue, end of period	$	8,702