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Segment and Revenue Information
 9 Months Ended
Jun. 30, 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 June 30,Nine Months Ended June 30,
(in thousands)2023202220232022
Revenue
Aerospace and Defense$27,001 $13,416 $73,879 $32,322 
Broadband(303)10,259 4,592 66,239 
Total revenue$26,698 $23,675 $78,471 $98,561 
Segment profit
Aerospace and Defense gross profit$7,163 $1,551 $16,786 $4,468 
Aerospace and Defense research and development expense4,448 3,834 14,050 12,037 
Aerospace and Defense gross profit less research and development expense$2,715 $(2,283)$2,736 $(7,569)
Broadband gross profit$(3,663)$2,347 $(6,516)$24,244 
Broadband research and development expense723 679 2,269 1,638 
Broadband gross profit less research and development expense$(4,386)$1,668 $(8,785)$22,606 
Total gross profit less research and development expense$(1,671)$(615)$(6,049)$15,037 

Product Categories

Revenue is classified by major product category as presented below:
Three Months Ended June 30,Nine Months Ended June 30,
(in thousands)2023202220232022
Aerospace and Defense
Inertial Navigation$26,718 $9,891 $70,947 $25,651 
Defense Optoelectronics283 3,525 2,932 6,671 
Broadband
CATV Optical Transmitters and Components323 7,006 2,270 56,449 
Data Center Chips(312)1,353 885 3,534 
Optical Sensing(314)1,900 1,437 6,256 
Total revenue$26,698 $23,675 $78,471 $98,561 

Timing of Revenue

Revenue is classified by timing of recognition as presented below:
Three Months Ended June 30,Nine Months Ended June 30,
(in thousands)2023202220232022
Trade revenue (recognized at a point in time)$19,667 $18,207 $58,763 $91,056 
Contract revenue (recognized over time)7,031 5,468 19,708 7,505 
Total revenue$26,698 $23,675 $78,471 $98,561 

Geographical Concentration

Revenue is classified by geographic area based on our customers’ billing address as presented below:
Three Months Ended June 30,Nine Months Ended June 30,
(in thousands)2023202220232022
United States and Canada$21,377 $19,043 $60,600 $86,751 
Asia1,856 1,684 4,235 6,498 
Europe1,657 2,243 8,592 3,999 
Other1,808 705 5,044 1,313 
Total revenue$26,698 $23,675 $78,471 $98,561 

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 two significant customers represented an aggregate of 41% and 35% of our consolidated revenue for the three and nine months ended June 30, 2023, respectively, and revenue from two significant customers represented an aggregate of 37% and 54% of our consolidated revenue for the three and nine months ended June 30, 2022, respectively.