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Segment and Revenue Information
 6 Months Ended
Mar. 31, 2022
Segment Reporting [Abstract]  
Segment and Revenue Information Segment and Revenue Information
Reportable Segments

Reported below are the Company’s segments for which separate financial information is available and upon which operating results are evaluated by the chief operating decision maker, the Chief Executive Officer, to assess performance and to allocate resources. We do not allocate sales and marketing, general and administrative expenses, or interest expense and interest income to our segments, because management does not include the information in its measurement of the performance of the operating segments. Also, a measure of segment assets and liabilities has not been provided to the Company's chief operating decision maker and therefore is not shown below.

Information on reportable segments utilized by the chief operating decision maker is as follows:
(in thousands)For the Three Months Ended March 31,For the Six Months Ended March 31,
2022202120222021
Revenue
Aerospace and Defense$9,006 $13,134 $18,906 $26,770 
Broadband23,644 25,272 55,980 45,062 
Total revenue$32,650 $38,406 $74,886 $71,832 
Segment income
Aerospace and Defense gross profit$1,233 $3,775 $2,917 $7,875 
Aerospace and Defense research and development expense4,041 3,157 8,203 6,843 
Aerospace and Defense segment profit$(2,808)$618 $(5,286)$1,032 
Broadband gross profit$7,784 $10,859 $21,897 $19,331 
Broadband research and development expense494 614 959 1,224 
Broadband segment profit$7,290 $10,245 $20,938 $18,107 
Consolidated segment profit$4,482 $10,863 $15,652 $19,139 
Unallocated expense
Selling, general, and administrative$7,563 $6,062 $14,750 $11,860 
Severance20 — 1,318 — 
(Gain) loss on sale of assets(788)218 (601)189 
Interest expense, net12 49 23 98 
Foreign exchange loss (gain)17 68 (25)(169)
Total unallocated expense$6,824 $6,397 $15,465 $11,978 
(Loss) income before income tax benefit (expense)$(2,342)$4,466 $187 $7,161 
Product Categories
Revenue is classified by major product category and is presented below:
For the Three Months Ended March 31,
(in thousands)2022% of
Revenue		2021% of
Revenue
Aerospace and Defense
Navigation and Inertial Sensing$7,615 23 %$8,993 23 %
Defense Optoelectronics1,391 4 4,141 11 
Broadband
CATV Lasers and Transmitters20,984 64 21,120 55 
Chip Devices1,113 3 841 2 
Other Optical Products1,547 5 3,311 9 
Total revenue$32,650 100 %$38,406 100 %

For the Six Months Ended March 31,
(in thousands)2022% of
Revenue		2021% of
Revenue
Aerospace and Defense
Navigation and Inertial Sensing$15,760 21 %$18,195 25 %
Defense Optoelectronics3,146 4 8,575 12 
Broadband
CATV Lasers and Transmitters49,443 66 38,435 54 
Chip Devices2,181 3 1,584 2 
Other Optical Products4,356 6 5,043 7 
Total revenue$74,886 100 %$71,832 100 %
Geographical Concentration

The following table sets forth revenue by geographic area based on our customers’ billing address:
For the Three Months Ended March 31,For the Six Months Ended March 31,
(in thousands)2022202120222021
United States and Canada$29,652 $33,106 $67,708 $62,452 
Asia1,728 4,145 4,814 7,170 
Europe936 558 1,756 1,214 
Other334 597 608 996 
Total revenue$32,650 $38,406 $74,886 $71,832 

Significant Customers

Significant customers are defined as customers representing greater than 10% of consolidated revenue. Significant portions of the Company’s sales are concentrated among a limited number of customers. Revenue from two and three of our significant customers represented an aggregate of 62% and 68% of our consolidated revenue for the three months ended March 31, 2022 and 2021, respectively. Revenue from two and three of our significant customers represented an aggregate of 64% and 69% of our consolidated revenue for the six months ended March 31, 2022 and 2021, respectively. The percentage from significant customers decreased due to lower Aerospace and Defense revenue.

The duration, severity, and future impact of the COVID-19 pandemic is highly uncertain and could result in significant disruptions to the business operations of the Company’s customers. If one or more of these significant customers significantly decreases their orders for the Company’s products, or if we are unable to deliver finished products to the customer in connection with such orders, the Company’s business could be materially and adversely affected.