Summary of Significant Accounting Policies (Tables)

12 Months Ended

Sep. 30, 2019

Accounting Policies [Abstract]

Schedule of Property, Plant and Equipment

Plant and equipment are depreciated on a straight-line basis over the following estimated useful lives of the assets: 

Description	Estimated Useful Life
Building	twenty years
Equipment	three to ten years
Furniture and fixtures	five years
Computer hardware and software	five to seven years
Leasehold improvements	three to six years

The components of property, plant, and equipment, net consisted of the following:

	As of
(in thousands)	September 30, 2019			September 30, 2018
Land	$	3,484		$	—
Building and improvements	9,405			—
Equipment	42,308			36,625
Furniture and fixtures	1,109			1,109
Computer hardware and software	3,554			2,928
Leasehold improvements	2,676			2,049
Construction in progress	9,330			3,648
Property, plant, and equipment, gross	$	71,866		$	46,359
Accumulated depreciation	(34,643		)	(28,143		)
Property, plant, and equipment, net	$	37,223		$	18,216

Revenue by Major Product Category

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

	For the Fiscal Years ended September 30,
(in thousands)	2019		% of Revenue		2018		% of Revenue		2017		% of Revenue
Broadband	$	53,233	61	%	$	68,418	80	%	$	109,633	89	%
Chips	10,828		12	%	10,050		12	%	9,170		8	%
Navigation	23,204		27	%	7,149		8	%	4,092		3	%
Total revenue	$	87,265	100	%	$	85,617	100	%	$	122,895	100	%