REVENUE REVENUE

12 Months Ended

Dec. 31, 2019

Revenue from Contract with Customer [Abstract]

REVENUE

REVENUE

Revenues by geographic region for the years ended December 31, 2019, 2018 and 2017 were as follows:

	Year ended December 31,
	2019		2018		2017
	(in thousands)
United States	$	515,292	$	402,840	$	327,528
China	372,041		258,451		172,405
Europe	169,594		174,892		176,937
Other Americas	123,956		128,077		92,449
Other Asia	149,693		124,483		94,574
Total revenue	$	1,330,576	$	1,088,743	$	863,893

The following tables represent our total revenues by product type and interconnect protocol for the years ended December 31, 2019, 2018 and 2017:

	Year ended December 31,
	2019		2018		2017
	(in thousands)
ICs	$	216,726	$	149,180	$	161,216
Boards	532,584		495,753		325,845
Switch systems	329,529		247,478		222,836
Cables, accessories and other	251,737		196,332		153,996
Total revenue	$	1,330,576	$	1,088,743	$	863,893

	Year ended December 31,
	2019		2018		2017
	(in thousands)
InfiniBand:
HDR	$	142,127	$	10,177	$	—
EDR	273,045		234,655		194,261
FDR	125,530		149,168		181,465
QDR/DDR/SDR	25,228		44,359		31,599
Total	565,930		438,359		407,325
Ethernet	743,899		618,471		401,005
Other	20,747		31,913		55,563
Total revenue	$	1,330,576	$	1,088,743	$	863,893

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 years ended December 31, 2019 and 2018:

	Year ended December 31,
	2019			2018
	(in thousands)
Balance, beginning of the period	$	39,223		$	36,804
New deferred revenue	49,514			29,604
Reclassification to revenue during the year (1)	(36,294		)	(27,185		)
Balance, end of the period	52,443			39,223
Less: long-term portion of deferred revenue	27,481			18,665
Current portion, end of the period	$	24,962		$	20,558

(1) Of the total reclassifications from deferred revenue to revenue, $20.6 million and $19.0 million were related to the beginning balance of 2019 and 2018, respectively, and $15.7 million and $8.2 million were related to the new deferred revenue during the years ended December 31, 2019 and 2018, respectively.

Unsatisfied performance obligations, other than extended warranty and post-contract customer support, primarily represent contracts with future delivery dates. As of December 31, 2019, the Company had $41.7 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 year ended December 31, 2019, the Company recognized $11.3 million of assets related to costs to obtain contracts, and amortized $7.5 million of these assets during the same period. The unamortized balance of the assets was $3.8 million as of December 31, 2019.