Description of Business (Tables)

6 Months Ended

Mar. 31, 2021

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Revenue by Major Product Category

Revenue is also classified by major product category and is presented below:

	For the three months ended March 31,								For the six months ended March 31,
(in thousands)	2021		% of Revenue		2020		% of Revenue		2021		% of Revenue		2020		% of Revenue
Navigation and Inertial Sensing	$	8,993	23	%	$	8,842	37	%	$	18,195	25	%	$	19,109	39	%
Defense Optoelectronics	4,141		11	%	4,171		18	%	8,575		12	%	7,608		15	%
CATV Lasers and Transmitters	21,120		55	%	8,782		37	%	38,435		54	%	18,165		37	%
Chip Devices	841		2	%	1,035		4	%	1,584		2	%	2,590		5	%
Other	3,311		9	%	1,020		4	%	5,043		7	%	1,860		4	%
Total revenue	$	38,406	100	%	$	23,850	100	%	$	71,832	100	%	$	49,332	100	%