REVENUE

9 Months Ended

Sep. 30, 2019

Revenue from Contract with Customer [Abstract]

Revenues by geographic region for the three and nine months ended September 30, 2019 and 2018 were as follows:



	Three Months Ended September 30,				Nine Months Ended September 30,
	2019		2018		2019		2018
	(in thousands)
United States	$	126,904	$	93,566	$	358,816	$	291,222
China	98,978		76,514		268,986		186,909
Europe	35,227		51,123		120,816		128,573
Other Americas	34,739		39,709		88,551		100,561
Other Asia	39,403		18,299		113,623		91,408
Total revenues	$	335,251	$	279,211	$	950,792	$	798,673

The following tables represent our total revenues for the three and nine months ended September 30, 2019 and 2018 by product type and interconnect protocol:



	Three Months Ended September 30,				Nine Months Ended September 30,
	2019		2018		2019		2018
	(in thousands)
ICs	$	44,452	$	46,397	$	158,121	$	103,918
Boards	145,500		130,047		374,573		384,806
Switch systems	79,094		53,484		234,960		166,205
Cables, accessories and other	66,205		49,283		183,138		143,744
Total revenues	$	335,251	$	279,211	$	950,792	$	798,673



	Three Months Ended September 30,				Nine Months Ended September 30,
	2019		2018		2019		2018
	(in thousands)
InfiniBand:
HDR	$	43,524	$	—	$	95,337	$	—
EDR	64,107		51,658		190,393		166,923
FDR	26,052		33,227		95,622		110,624
QDR/DDR/SDR	766		12,980		24,116		25,567
Total	134,449		97,865		405,468		303,114
Ethernet	198,000		175,517		528,023		469,935
Other	2,802		5,829		17,301		25,624
Total revenues	$	335,251	$	279,211	$	950,792	$	798,673

Contract balances

The Company recognizes contract liabilities, or deferred revenues, when it receives advance payments from customers before performance obligations primarily related to extended warranty and post-contract customer support have been performed. Advance payments are received at the beginning of the service period and the related deferred revenues are reclassified to revenue ratably over the service period. The balance of deferred revenues approximates the aggregate amount of the transaction price allocated to the unsatisfied performance obligations at the end of reporting period. The Company expects to recognize the long-term portion of deferred revenue over the remaining service period of up to five years.

The following table presents the significant changes in the deferred revenue balance during the nine months ended September 30, 2019:



	(in thousands)
Balance, beginning of the period	$	39,223
New deferred revenue	32,551
Reclassification to revenues during the year (1)	(26,192		)
Balance, end of the period	45,582
Less: long-term portion of deferred revenue	22,257
Current portion, end of the period	$	23,325

(1) Of the total reclassification from deferred revenue to revenues, $16.5 million was related to the beginning balance, and $9.7 million was related to the new deferred revenue during the period.

Unsatisfied performance obligations, other than extended warranty and post-contract customer support, primarily represent contracts with future delivery dates. As of September 30, 2019, the Company had $53.7 million of unbilled transaction price allocated to performance obligations that were unsatisfied or partially unsatisfied related to contracts with an original duration over one year. The Company expects to invoice and recognize the revenue as it satisfies each performance obligation during a period of three years. The foregoing excludes the value of the remaining unsatisfied performance obligations related to contracts that have original durations of one year or less.

The Company recognizes assets for the material incremental costs of obtaining contracts with customers if it expects the benefit of those costs to be longer than one year. The Company allocates these assets proportionally to the performance obligations in the contracts and amortizes them as the performance obligations are satisfied. During the nine months ended September 30, 2019, the Company recognized $11.3 million of assets related to costs to obtain contracts, and amortized $7.1 million of these assets during the same period. The unamortized balance of the assets was $4.2 million as of September 30, 2019.