Segment Reporting (Tables)

3 Months Ended

Mar. 31, 2019

Summary of Product Revenues by Product Line

The following table represents product revenues by product line:

	Three Months Ended March 31,				Increase/ (Decrease)
	2019		2018		$ Change		% Change
	(Amounts in thousands)
Chromatography products	$	13,890	$	10,583	$	3,307		31.2	%
Filtration products		28,882		19,793		9,089		45.9	%
Protein products		16,653		13,586		3,067		22.6	%
Other		1,187		837		350		41.8	%
Total product revenue	$	60,612	$	44,799	$	15,813		35.3	%

Percentage of Revenue from Significant Customers

Revenue from significant customers as a percentage of the Company’s total revenue is as follows:

	Three Months Ended March 31,
	2019			2018
MilliporeSigma		16	%		17	%
GE Healthcare		13	%		14	%

Total Revenue

Percentage by Geographic Area or Significant Customers

The following table represents the Company’s total revenue by geographic area (based on the location of the customer):

	Three Months Ended
	March 31,
	2019			2018
Revenue by customers’ geographic locations:
North America		47	%		45	%
Europe		40	%		43	%
APAC		13	%		11	%
Other		0	%		1	%
Total revenue		100	%		100	%

Accounts Receivable

Percentage by Geographic Area or Significant Customers

Significant accounts receivable balances as a percentage of the Company’s total trade accounts receivable are as follows:

	March 31,			December 31,
	2019			2018
GE Healthcare		15	%		17	%
MilliporeSigma		*			11	%

* MilliporeSigma’s percentage of the Company’s total trade accounts receivable at March 31, 2019 did not exceed 10%.