14. Segment Information

Operating segments are defined as components of an enterprise that engage in business activities for which discrete financial information is available and regularly reviewed by the chief operating decision maker in deciding how to allocate resources and assess performance. The Company’s Chief Executive Officer is the Company’s chief operating decision maker. The Company reports its financial results for two operating and reportable segments which consist of Brooks Semiconductor Solutions Group segment and Brooks Life Sciences segment. Please refer to Note 18, "Segment and Geographic Information" to the Company’s consolidated financial statements included in the 2017 Annual Report on Form 10‑K for further information on the operating segments’ description and accounting policies.

The following is the summary of the financial information for the Company’s operating and reportable segments for the three and nine months ended June 30, 2018 and 2017 and balances as of June 30, 2018 and September 30, 2017 (in thousands):


	Brooks
	Semiconductor		Brooks
	Solutions Group		Life Sciences		Total

Three Months Ended June 30, 2018:
Revenue
Products	$	150,675	$	23,438	$	174,113
Services		23,102		26,265		49,367
Segment revenue	$	173,777	$	49,703	$	223,480
Gross profit	$	70,634	$	18,587	$	89,221
Segment operating income		33,674		2,034		35,708
Depreciation expense		1,072		1,991		3,063

Three Months Ended June 30, 2017:
Revenue
Products	$	124,681	$	17,276	$	141,957
Services		20,280		19,480		39,760
Segment revenue	$	144,961	$	36,756	$	181,717
Gross profit	$	58,083	$	13,489	$	71,572
Segment operating income		26,188		1,134		27,322
Depreciation expense		1,192		1,134		2,326

Nine Months Ended June 30, 2018:
Revenue
Products	$	407,903	$	68,885	$	476,788
Services		66,481		76,799		143,280
Segment revenue	$	474,384	$	145,684	$	620,068
Gross profit	$	195,386	$	53,279	$	248,665
Segment operating income		90,872		4,577		95,449
Depreciation expense		3,354		5,579		8,933

Nine Months Ended June 30, 2017:
Revenue
Products	$	349,710	$	46,974	$	396,684
Services		56,532		57,789		114,321
Segment revenue	$	406,242	$	104,763	$	511,005
Gross profit	$	154,877	$	38,162	$	193,039
Segment operating income		63,562		2,535		66,097
Depreciation expense		3,786		3,269		7,055

Assets:
June 30, 2018	$	361,382	$	414,702	$	776,084
September 30, 2017		325,408		306,666		632,074

The following is a reconciliation of the Company’s operating and reportable segments’ operating income and segment assets to the corresponding amounts presented in the accompanying unaudited Consolidated Statements of Operations for the three and nine months ended June 30, 2018 and 2017 and Consolidated Balance Sheets as of June 30, 2018 and September 30, 2017 (in thousands):


		Three Months Ended			Nine Months Ended
		June 30,			June 30,
	2018		2017		2018		2017
Segment operating income	$	35,708	$	27,322	$	95,449	$	66,097
Amortization of acquired intangible assets		5,080		3,278		14,298		9,636
Restructuring charges		82		828		131		2,663
Other unallocated corporate expenses		3,867		4,446		9,682		7,066
Total operating income	$	26,679	$	18,770	$	71,338	$	46,732


	June 30,		September 30,
	2018		2017
Segment assets	$	776,084	$	632,074
Cash, cash equivalents and marketable securities		231,983		104,292
Deferred tax assets		46,312		1,692
Equity method investments		37,051		28,570
Total assets	$	1,091,430	$	766,628