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Segment and Revenue Information
 6 Months Ended
Mar. 31, 2023
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:
Three Months Ended March 31,Six Months Ended March 31,
(in thousands)2023202220232022
Revenue
Aerospace and Defense$25,203 $9,006 $46,878 $18,906 
Broadband1,617 23,644 4,895 55,980 
Total revenue$26,820 $32,650 $51,773 $74,886 
Segment profit
Aerospace and Defense gross profit$5,515 $1,233 $9,623 $2,917 
Aerospace and Defense research and development expense5,253 4,041 9,602 8,203 
Aerospace and Defense gross profit less research and development expense$262 $(2,808)$21 $(5,286)
Broadband gross profit$(1,804)$7,784 $(2,853)$(21,897)
Broadband research and development expense544 494 1,546 959 
Broadband gross profit less research and development expense$(2,348)$7,290 $(4,399)$20,938 
Total gross profit less research and development expense$(2,086)$4,482 $(4,378)$15,652 

Product Categories

Revenue is classified by major product category as presented below:
Three Months Ended March 31,Six Months Ended March 31,
(in thousands)2023202220232022
Aerospace and Defense
Inertial Navigation$24,250 $7,615 $44,229 $15,760 
Defense Optoelectronics953 1,391 2,649 3,146 
Broadband
CATV Optical Transmitters and Components394 20,984 1,947 49,443 
Data Center Chips790 1,113 1,197 2,181 
Optical Sensing433 1,547 1,751 4,356 
Total revenue$26,820 $32,650 $51,773 $74,886 

Timing of Revenue

Revenue is classified by timing of recognition as presented below:
Three Months Ended March 31,Six Months Ended March 31,
(in thousands)2023202220232022
Trade revenue (recognized at a point in time)$19,989 $31,157 $39,096 $72,849 
Contract revenue (recognized over time)6,831 1,493 12,677 2,037 
Total revenue$26,820 $32,650 $51,773 $74,886 

Geographical Concentration

Revenue is classified by geographic area based on our customers’ billing address as presented below:
Three Months Ended March 31,Six Months Ended March 31,
(in thousands)2023202220232022
United States and Canada$20,221 $29,652 $39,223 $67,708 
Asia959 1,728 2,379 4,814 
Europe3,732 963 6,935 1,756 
Other1,908 334 3,236 608 
Total revenue$26,820 $32,650 $51,773 $74,886 

Customer Concentration

Portions of the Company’s sales are concentrated among a limited number of customers. Significant customers are defined as customers representing greater than 10% of consolidated revenue. Revenue from one significant customer represented an aggregate of 27% and two significant customers represented an aggregate of 32% of our consolidated revenue for the three months and six months ended March 31, 2023, respectively, and revenue from two significant customers represented an aggregate of 62% and 64% of our consolidated revenue for the three and six months ended March 31, 2022, respectively. The percentage from significant customers decreased due to lower CATV revenue from our Broadband segment.