Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($) shares in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Statement [Abstract]
Revenue	$ 17,219,000	$ 17,717,000	$ 62,965,000	$ 60,376,000
Cost of revenue	13,515,000	16,519,000	47,644,000	46,317,000
Gross profit	3,704,000	1,198,000	15,321,000	14,059,000
Operating expense:
Selling, general, and administrative	9,288,000	5,237,000	23,877,000	15,700,000
Research and development	4,629,000	3,915,000	13,008,000	11,015,000
Gain from change in estimate on ARO obligation	0	0	(40,000)	0
(Gain) loss on sale of assets	0	0	0	39,000
Total operating expense	13,917,000	9,152,000	36,845,000	26,754,000
Operating loss	(10,213,000)	(7,954,000)	(21,524,000)	(12,695,000)
Other income:
Interest income, net	99,000	216,000	590,000	490,000
Foreign exchange (loss) gain	(349,000)	(676,000)	(31,000)	136,000
Total other (loss) income	(250,000)	(460,000)	559,000	626,000
Loss before income tax (expense) benefit	(10,463,000)	(8,414,000)	(20,965,000)	(12,069,000)
Income tax (expense) benefit	(14,000)	0	(44,000)	502,000
Net loss	(10,477,000)	(8,414,000)	(21,009,000)	(11,567,000)
Foreign exchange translation adjustment	9,000	(54,000)	36,000	320,000
Comprehensive loss	$ (10,468,000)	$ (8,468,000)	$ (20,973,000)	$ (11,247,000)
Per share data:
Net loss per basic and diluted share (in usd per share)	$ (0.37)	$ (0.31)	$ (0.76)	$ (0.43)
Weighted-average number of basic and diluted shares outstanding (in shares)				27,204