Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($) shares in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Income Statement [Abstract]
Revenue	$ 23,850,000	$ 21,745,000	$ 49,332,000	$ 45,746,000
Cost of revenue	17,423,000	15,936,000	35,431,000	34,129,000
Gross profit	6,427,000	5,809,000	13,901,000	11,617,000
Operating expense:
Selling, general, and administrative	7,139,000	6,996,000	13,026,000	14,589,000
Research and development	4,584,000	4,360,000	9,226,000	8,379,000
Gain from change in estimate on ARO obligation		(40,000)	0	(40,000)
Gain on sale of assets	(315,000)		(1,917,000)	0
Total operating expense	11,408,000	11,316,000	20,335,000	22,928,000
Operating loss	(4,981,000)	(5,507,000)	(6,434,000)	(11,311,000)
Other income:
Interest income (expense), net	1,000	224,000	(14,000)	491,000
Foreign exchange (loss) gain	(156,000)	304,000	(9,000)	318,000
Total other income	(155,000)	528,000	(23,000)	809,000
Loss before income tax expense	(5,136,000)	(4,979,000)	(6,457,000)	(10,502,000)
Income tax benefit (expense)	55,000	(15,000)	41,000	(30,000)
Net loss	(5,081,000)	(4,994,000)	(6,416,000)	(10,532,000)
Foreign exchange translation adjustment	29,000	13,000	(7,000)	27,000
Comprehensive loss	$ (5,052,000)	$ (4,981,000)	$ (6,423,000)	$ (10,505,000)
Per share data:
Net loss per basic and diluted share (in dollars per share)	$ (0.18)	$ (0.18)	$ (0.22)	$ (0.38)
Weighted-average number of basic and diluted shares outstanding (in shares)	29,033	27,652	28,931	27,592