CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss
Beginning Balance at Sep. 30, 2018	$ 176,587	$ 136	$ 86,116	$ 105,954	$ (15,619)
Beginning Balance, Shares at Sep. 30, 2018		13,600,541
Net income (loss)	(5,853)			(5,853)
Other comprehensive income (loss)	(154)				(154)
Issuance of restricted stock, Shares		8,000
Forfeiture of restricted stock, Shares		(250)
Issuance of common stock pursuant to the exercise of stock options	215		215
Issuance of common stock pursuant to the exercise of stock options, Shares		24,500
Stock-based compensation	602		602
Ending Balance at Dec. 31, 2018	171,397	$ 136	86,933	100,101	(15,773)
Ending Balance, Shares at Dec. 31, 2018		13,632,791
Beginning Balance at Sep. 30, 2018	176,587	$ 136	86,116	105,954	(15,619)
Beginning Balance, Shares at Sep. 30, 2018		13,600,541
Net income (loss)	(8,818)
Other comprehensive income (loss)	259
Foreign currency translation adjustments	177
Ending Balance at Jun. 30, 2019	170,024	$ 136	88,112	97,136	(15,360)
Ending Balance, Shares at Jun. 30, 2019		13,632,041
Beginning Balance at Dec. 31, 2018	171,397	$ 136	86,933	100,101	(15,773)
Beginning Balance, Shares at Dec. 31, 2018		13,632,791
Net income (loss)	707			707
Other comprehensive income (loss)	257				257
Forfeiture of restricted stock, Shares		(1,000)
Issuance of common stock pursuant to the vesting of restricted stock units, Shares		500
Stock-based compensation	592		592
Ending Balance at Mar. 31, 2019	172,953	$ 136	87,525	100,808	(15,516)
Ending Balance, Shares at Mar. 31, 2019		13,632,291
Net income (loss)	(3,672)			(3,672)
Other comprehensive income (loss)	156				156
Foreign currency translation adjustments	157
Forfeiture of restricted stock, Shares		(250)
Stock-based compensation	587		587
Ending Balance at Jun. 30, 2019	170,024	$ 136	88,112	97,136	(15,360)
Ending Balance, Shares at Jun. 30, 2019		13,632,041
Beginning Balance at Sep. 30, 2019	$ 178,847	$ 136	88,660	105,808	(15,757)
Beginning Balance, Shares at Sep. 30, 2019	13,630,666	13,630,666
Net income (loss)	$ (9,282)			(9,282)
Foreign currency translation adjustments	566				566
Issuance of common stock pursuant to the vesting of restricted stock units	1	$ 1
Issuance of common stock pursuant to the vesting of restricted stock units, Shares		30,823
Stock-based compensation	590		590
Ending Balance at Dec. 31, 2019	170,722	$ 137	89,250	96,526	(15,191)
Ending Balance, Shares at Dec. 31, 2019		13,661,489
Beginning Balance at Sep. 30, 2019	$ 178,847	$ 136	88,660	105,808	(15,757)
Beginning Balance, Shares at Sep. 30, 2019	13,630,666	13,630,666
Net income (loss)	$ (13,093)
Ending Balance at Mar. 31, 2020	166,427	$ 137	89,783	92,715	(16,208)
Ending Balance, Shares at Mar. 31, 2020		13,664,989
Beginning Balance at Sep. 30, 2019	$ 178,847	$ 136	88,660	105,808	(15,757)
Beginning Balance, Shares at Sep. 30, 2019	13,630,666	13,630,666
Net income (loss)	$ (15,378)
Other comprehensive income (loss)	(686)
Foreign currency translation adjustments	(686)
Ending Balance at Jun. 30, 2020	$ 164,466	$ 137	90,342	90,430	(16,443)
Ending Balance, Shares at Jun. 30, 2020	13,664,614	13,664,614
Beginning Balance at Dec. 31, 2019	$ 170,722	$ 137	89,250	96,526	(15,191)
Beginning Balance, Shares at Dec. 31, 2019		13,661,489
Net income (loss)	(3,811)			(3,811)
Foreign currency translation adjustments	(1,017)				(1,017)
Issuance of common stock pursuant to the vesting of restricted stock units, Shares		3,500
Stock-based compensation	533		533
Ending Balance at Mar. 31, 2020	166,427	$ 137	89,783	92,715	(16,208)
Ending Balance, Shares at Mar. 31, 2020		13,664,989
Net income (loss)	(2,285)			(2,285)
Other comprehensive income (loss)	(235)
Foreign currency translation adjustments	(235)				(235)
Forfeiture of restricted stock, Shares		(375)
Stock-based compensation	559		559
Ending Balance at Jun. 30, 2020	$ 164,466	$ 137	$ 90,342	$ 90,430	$ (16,443)
Ending Balance, Shares at Jun. 30, 2020	13,664,614	13,664,614