REVENUE (Tables)

6 Months Ended

Jun. 30, 2019

Revenue from Contract with Customer [Abstract]

Disaggregation of revenue

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

	Three Months Ended June 30,				Six Months Ended June 30,
	2019		2018		2019		2018
	(in thousands)
United States	$	121,618	$	101,396	$	231,912	$	197,656
China	91,868		54,182		170,008		110,395
Europe	38,343		41,454		85,589		77,450
Other Americas	28,082		33,112		53,811		60,852
Other Asia	30,413		38,318		74,221		73,109
Total revenues	$	310,324	$	268,462	$	615,541	$	519,462

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

	Three Months Ended June 30,				Six Months Ended June 30,
	2019		2018		2019		2018
	(in thousands)
ICs	$	53,046	$	28,934	$	113,669	$	57,521
Boards	120,643		136,708		229,073		254,759
Switch systems	73,808		57,074		155,866		112,721
Cables, accessories and other	62,827		45,746		116,933		94,461
Total revenues	$	310,324	$	268,462	$	615,541	$	519,462

	Three Months Ended June 30,				Six Months Ended June 30,
	2019		2018		2019		2018
	(in thousands)
InfiniBand:
HDR	$	28,620	$	—	$	51,813	$	—
EDR	66,643		59,319		$	126,286	$	115,265
FDR	28,972		35,649		69,570		77,397
QDR/DDR/SDR	8,646		7,143		23,350		12,587
Total	132,881		102,111		271,019		205,249
Ethernet	169,131		157,470		330,024		294,418
Other	8,312		8,881		14,498		19,795
Total revenues	$	310,324	$	268,462	$	615,541	$	519,462

Changes in deferred revenue balances

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

	(in thousands)
Balance, beginning of the period	$	39,223
New deferred revenue	21,013
Reclassification to revenues during the year (1)	(17,014		)
Balance, end of the period	43,222
Less: long-term portion of deferred revenue	20,224
Current portion, end of the period	$	22,998

(1) Of the total reclassification from deferred revenue to revenues, $11.7 million was related to the beginning balance, and $5.3 million was related to the new deferred revenue during the period.