Summary of Significant Accounting Policies (Tables)

12 Months Ended

Sep. 30, 2017

Accounting Policies [Abstract]

Schedule of Estimated Useful Life

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

Estimated Useful Life
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			As of
(in thousands)	September 30, 2017			September 30, 2016
Equipment	$	31,507		$	28,247
Furniture and fixtures	1,109			1,109
Computer hardware and software	2,974			2,860
Leasehold improvements	2,330			1,896
Construction in progress	4,539			1,779
Property, plant, and equipment, gross	$	42,459		35,891
Accumulated depreciation	(25,824		)	(23,678		)
Property, plant, and equipment, net	$	16,635		$	12,213