The Company accounts for revenue in accordance with ASC Topic 606, Revenue from Contracts with Customers, which the Company adopted on July 1, 2017, using the retrospective method. The Company derives the majority of its revenue from sales of its networking equipment, with the remaining revenue generated from service fees primarily relating to maintenance contracts with additional revenues from professional services, and training for its products. The Company sells its products and maintenance contracts direct to customers and to partners in two distribution channels, or tiers. The first tier consists of a limited number of independent distributors that stock its products and sell primarily to resellers. The second tier of the distribution channel consists of a non-stocking distributors and value-added resellers that sell directly to end-users. Products and services may be sold separately or in bundled packages.

Performance Obligations. A performance obligation is a promise in a contract to transfer a distinct good or service to the customer and is the unit of account in Topic 606. A contract’s transaction price is allocated to each distinct performance obligation and recognized as revenue when, or as, the performance obligation is satisfied. Certain of the Company’s contracts have multiple performance obligations, as the promise to transfer individual goods or services is separately identifiable from other promises in the contracts and, therefore, is distinct. For contracts with multiple performance obligations, the Company allocates the contract’s transaction price to each performance obligation based on its relative standalone selling price. The stand-alone selling prices are determined based on the prices at which the Company separately sells these products. For items that are not sold separately, the Company estimates the stand-alone selling prices using the best estimated selling price approach.

The Company’s performance obligations are satisfied at a point in time or over time as work progresses. Substantially all of the Company’s product sales revenues as reflected on the condensed consolidated statements of operations for the three and six months ended December 31, 2018 and 2017 are recognized at a point in time. Substantially all of the Company’s service revenue is recognized over time. For revenue recognized over time, the Company uses an input measure, days elapsed, to measure progress.

On December 31, 2018, the Company had $186.1 million of remaining performance obligations, which is comprised of deferred maintenance revenue and services not yet delivered. The Company expects to recognize approximately 48 percent of its remaining performance obligations as revenue in fiscal 2019, an additional 35 percent in fiscal 2020 and 17 percent of the balance thereafter.

Contract Balances. The timing of revenue recognition, billings and cash collections results in billed accounts receivable and deferred revenue in the consolidated balance sheet. Services provided under renewable support arrangements of the Company are billed in accordance with agreed-upon contractual terms, which are typically at periodic intervals (e.g., quarterly or annually). The Company sometimes receives payments from its customers in advance of services being provided, resulting in deferred revenues. These liabilities are reported on the consolidated balance sheet on a contract-by-contract basis at the end of each reporting period.

Revenue recognized for the three months ended December 31, 2018 and 2017 that was included in the deferred revenue balance at the beginning of each period was $59.9 million and $36.9 million, respectively. Revenue recognized for the six months ended December 31, 2018 and 2017 that was included in the deferred revenue balance at the beginning of each period was $88.8 million and $52.9 million, respectively.

Contract Costs. The Company recognizes the incremental costs of obtaining contracts as an expense when incurred if the amortization period of the assets that the Company otherwise would have recognized is one year or less. Management expects that commission fees paid to sales representative as a result of obtaining service contracts and contract renewals are recoverable and therefore the Company’s capitalized balances in the amount of $5.3 million and $3.2 million at December 31, 2018 and 2017, respectively. Capitalized commission fees are amortized on a straight-line basis over the average period of service contracts of approximately three years, and are included in “Sales and marketing” in the accompanying condensed consolidated statements of operations. Amortization recognized during the three months ended December 31, 2018 and 2017, was $0.7 million and $0.5 million, respectively. Amortization recognized during the six months ended December 31, 2018 and 2017 was $1.4 million and $0.9 million, respectively. There was no impairment loss in relation to the costs capitalized.

Estimated Variable Consideration. There were no material changes in the current period to the estimated variable consideration for performance obligations which were satisfied or partially satisfied during previous periods.

The following table sets forth the Company’s revenue disaggregated by sales channel and geographic region based on the customer’s ship-to locations (in thousands):

	Three Months Ended
	December 31, 2018						December 31, 2017
	Distributor		Direct		Total		Distributor		Direct		Total
Americas:
United States	$	44,141	$	55,326	$	99,467	$	56,269	$	54,559	$	110,828
Other		8,269		5,380		13,649		1,155		5,698		6,853
Total Americas		52,410		60,706		113,116		57,424		60,257		117,681
EMEA		79,876		32,773		112,649		55,956		33,624		89,580
APAC		4,767		22,148		26,915		5,131		18,731		23,862
Total net revenues	$	137,053	$	115,627	$	252,680	$	118,511	$	112,612	$	231,123

	Six Months Ended
	December 31, 2018						December 31, 2017
	Distributor		Direct		Total		Distributor		Direct		Total
Americas:
United States	$	100,883	$	115,262	$	216,145	$	98,661	$	105,549	$	204,210
Other		12,762		10,904		23,666		15,491		12,093		27,584
Total Americas		113,645		126,166		239,811		114,152		117,642		231,794
EMEA		141,207		63,611		204,818		107,188		61,527		168,715
APAC:		7,116		40,821		47,937		8,395		33,934		42,329
Total net revenues	$	261,968	$	230,598	$	492,566	$	229,735	$	213,103	$	442,838

The Company performs ongoing credit evaluations of its customers and generally does not require collateral in exchange for credit.

The following table sets forth major customers accounting for 10% or more of the Company’s net revenues:

	Three Months Ended		Six Months Ended
	December 31, 2018	December 31, 2017	December 31, 2018	December 31, 2017
Tech Data Corporation	22%	12%	19%	12%
Westcon Group Inc.	15%	14%	14%	15%
Jenne Corporation	12%	*	12%	10%

The following table sets forth major customers accounting for 10% or more of the Company’s accounts receivable balance:

	December 31, 2018	June 30, 2018
Westcon Group Inc.	23%	*
Tech Data Corporation	22%	17%
Jenne Corporation	*	13%

* Less than 10% of accounts receivable