Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($) shares in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Statement [Abstract]
Revenue	$ 27,266,000	$ 17,219,000	$ 76,598,000	$ 62,965,000
Cost of revenue	18,048,000	13,515,000	53,479,000	47,644,000
Gross profit	9,218,000	3,704,000	23,119,000	15,321,000
Operating expense:
Selling, general, and administrative	5,936,000	9,288,000	18,962,000	23,877,000
Research and development	4,807,000	4,629,000	14,033,000	13,008,000
Gain from change in estimate on ARO obligation			0	(40,000)
Gain on sale of assets	(312,000)		(2,229,000)	0
Total operating expense	10,431,000	13,917,000	30,766,000	36,845,000
Operating loss	(1,213,000)	(10,213,000)	(7,647,000)	(21,524,000)
Other income:
Interest (expense) income, net	(40,000)	99,000	(54,000)	590,000
Foreign exchange (loss) gain	(20,000)	(349,000)	(29,000)	(31,000)
Total other (expense) income	(60,000)	(250,000)	(83,000)	559,000
Loss before income tax (expense) benefit	(1,273,000)	(10,463,000)	(7,730,000)	(20,965,000)
Income tax (expense) benefit	(14,000)	(14,000)	27,000	(44,000)
Net loss	(1,287,000)	(10,477,000)	(7,703,000)	(21,009,000)
Foreign exchange translation adjustment	2,000	9,000	(5,000)	36,000
Comprehensive loss	$ (1,285,000)	$ (10,468,000)	$ (7,708,000)	$ (20,973,000)
Per share data:
Net loss per basic and diluted share (in dollars per share)	$ (0.04)	$ (0.37)	$ (0.27)	$ (0.76)
Weighted-average number of basic and diluted shares outstanding (in shares)	29,295	28,005	29,052	27,730