Revenue Recognition

The Company recognizes revenue when control of a good or service promised in a contract (i.e., performance obligation) is transferred to a customer. Control is obtained when a customer has the ability to direct the use of and obtain substantially all of the remaining benefits from that good or service. The majority of the Company’s revenues are recognized over time as the customer receives control as the Company performs work under a contract. However, a portion of the Company’s revenues are recognized at a point-in-time as control is transferred at a distinct point in time per the terms of a contract.

Disaggregated Revenue

A summary of net sales transferred to customers at a point in time and over time for the periods ended October 31, 2019 and October 31, 2018 is as follows (in thousands):



	Three Months Ended October 31, 2019						Three months ended October 31, 2018
	Domestic		International		Total		Domestic		International		Total
Over Time	$	29,950	$	8,138	$	38,088	$	28,311	$	6,656	$	34,967
Point in Time	1,634		—		1,634		2,311		—		2,311
	$	31,584	$	8,138	$	39,722	$	30,622	$	6,656	$	37,278



	Six Months Ended October 31, 2019						Six Months Ended October 31, 2018
	Domestic		International		Total		Domestic		International		Total
Over Time	$	58,185	$	18,187	$	76,372	$	62,559	$	12,738	$	75,297
Point in Time	2,686		—		2,686		4,133		—		4,133
	$	60,871	$	18,187	$	79,058	$	66,692	$	12,738	$	79,430

Contract Balances

The closing and opening balances of contract assets arising from contracts with customers which were recorded as unbilled receivables were $5,116,000 at October 31, 2019 and $4,589,000 at April 30, 2019. The closing and opening balances of contract liabilities arising from contracts with customers were $2,032,000 at October 31, 2019 and $1,599,000 at April 30, 2019. The timing of revenue recognition, billings and cash collections results in accounts receivable, unbilled receivables, and deferred revenue which are disclosed on the consolidated balance sheets and in the notes to the consolidated financial statements. In general, the Company receives payments from customers based on a billing schedule established in its contracts. Unbilled receivables represent amounts earned which have not yet been billed in accordance with contractually stated billing terms. Receivables are recorded when the right to consideration becomes unconditional and the Company has a right to invoice the customer. Deferred revenue relates to payments received in advance of performance under the contract. Deferred revenue is recognized as revenue as (or when) the Company performs under the contract. Approximately all of the contract liability balances at April 30, 2019 and October 31, 2019 are expected to be recognized as revenue during the respective succeeding 12 months.