REVENUE (Tables)

12 Months Ended

Dec. 31, 2019

Revenue from Contract with Customer [Abstract]

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

Changes in deferred revenue balances

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.