Equity and Stock-Based Compensation - Additional Information (Details) - USD ($)					12 Months Ended				84 Months Ended	120 Months Ended
	Nov. 29, 2018	Mar. 28, 2018	Aug. 23, 2017	Aug. 18, 2017	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 1996	Dec. 31, 2015	Dec. 31, 2014	Apr. 30, 2007
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, par value					$ 0.01	$ 0.01
Total cost of shares repurchased and retired						$ 4,000,000
Stock-based compensation expense					$ 573,000	$ 855,000	$ 1,328,000
Compensation cost on non-vested stock options not yet recognized					$ 400,000
Compensation cost, expected weighted-average recognition period					1 year 7 months 20 days
Shares available to grant					956,053
2007 Employee Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available to grant					856,453
2007 Employee Stock Incentive Plan | Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available to grant											500,000
Number of additional shares authorized									2,500,000
Non-Employee Directors Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available to grant					99,600
Non-Employee Directors Stock Option Plan | Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of additional shares authorized										400,000
Share-based compensation, shares issued								100,000
2018 Stock Repurchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchase program period		1 year
Authorized stock repurchase amount		$ 4,000,000
Common stock, par value		$ 0.01
Shares repurchased and retired during the period						771,149
Total cost of shares repurchased and retired						$ 4,000,000
Average price per share of shares repurchased						$ 5.19
2019 Stock Repurchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchase program period	1 year
Authorized stock repurchase amount	$ 4,000,000
Common stock, par value	$ 0.01
Shares repurchased and retired during the period					0
Offering
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares sold			1,213,250	1,055,000
Sale of stock price per share			$ 9.50	$ 9.50
Proceeds from sale of stock			$ 10,600,000
Over-Allotment Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares sold				158,250