Stockholders’ Equity - Narrative (Details) - USD ($)													2 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	Apr. 07, 2023	Apr. 06, 2023	Apr. 04, 2023	Mar. 15, 2023	Jan. 26, 2023	Jan. 12, 2023	Jun. 03, 2022	May 09, 2022	Feb. 14, 2022	Sep. 08, 2021	May 20, 2021	Apr. 12, 2018	Sep. 30, 2023	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022	Jun. 16, 2023	Jan. 27, 2023	Dec. 15, 2022	May 19, 2022
Equity, Class of Treasury Stock [Line Items]
Common stock, authorized (in shares)													50,000,000	50,000,000		50,000,000		50,000,000
Common stock, par value (in dollars per share)													$ 0.0005	$ 0.0005		$ 0.0005		$ 0.0005			$ 0.0005
Preferred stock, authorized (in shares)													1,000,000	1,000,000		1,000,000		1,000,000
Preferred stock, par value (in dollars per share)													$ 0.0005	$ 0.0005		$ 0.0005		$ 0.0005
Preferred stock, issued (in shares)													0	0		0		0
Dividends declared																$ 0
Cash dividend declared (in dollars per share)								$ 0.30	$ 0.30
Payments of ordinary dividends								$ 4,700,000	$ 4,600,000
Stock repurchase, authorized				$ 6,000,000						$ 6,000,000
Stock repurchase, period (in months)				9 months						9 months
Stock options granted (in shares)																1,125,000
Options, value																$ 4,100,000
Closing stock price (in dollars per share)													$ 4.37	$ 4.37		$ 4.37
Return of shares (in shares)																744,369
Cash payment for repurchase																$ 5,400,000
Treasury stock repurchased (in shares)																603,881
Award vesting period (in years)						5 years
Exercise price (in price per share)						$ 10.00
Estimated fair value of options at date of grant						$ 300,000
Warrants term (in years)						1 year														5 years
Prepaid expenses and other current assets													$ 2,831,000	$ 2,831,000		$ 2,831,000		$ 2,366,000
Proceeds from exercise of warrants													$ 1,200,000			$ 1,200,000	$ 0
Warrants, exercise price (in dollars per share)													$ 3.00	$ 3.00		$ 3.00
Share-based compensation expense														$ 700,000	$ 2,000,000	$ 2,900,000	$ 3,000,000
Share-based compensation expense, remaining																$ 6,600,000
Weighted average remaining contractual life, outstanding shares (in years)																4 years 6 months
2023 Notes Warrants
Equity, Class of Treasury Stock [Line Items]
Expected volatility rate					81.50%
Risk free interest rate					3.62%
Exercise price (in price per share)					$ 9.00
Warrants (in shares)					76,000															76,000
Warrants term (in years)					5 years
Warrant, fair value					$ 380,000
Common Stock
Equity, Class of Treasury Stock [Line Items]
Shares repurchased (in shares)															5,048	69,628	205,048
Stock options exercised (in shares)															308,385	603,881	545,312
Issuance of common stock upon exercise of warrant (in shares)														400,000		400,000
Warrant
Equity, Class of Treasury Stock [Line Items]
Expected volatility rate		80.40%				80.90%
Risk free interest rate		3.59%				3.53%
Warrant life (in years)		5 years				5 years
Exercise price (in price per share)		$ 9.00
Warrants (in shares)		250,000				50,000
Warrants term (in years)		5 years
Warrant, fair value		$ 1,400,000
Prepaid expenses and other current assets													$ 1,100,000	$ 1,100,000		$ 1,100,000
Issuance of common stock upon exercise of warrant (in shares)													400,000
Weighted average remaining contractual life, outstanding shares (in years)																2 years 2 months 12 days		1 year 10 months 24 days
Stock Options
Equity, Class of Treasury Stock [Line Items]
Expected volatility rate																80.00%
Risk free interest rate																3.70%
Warrant life (in years)																4 years 8 months 12 days
Inducement Option Award
Equity, Class of Treasury Stock [Line Items]
Inducement award (in shares)																250,000
Inducement Option Award | Vesting Period One
Equity, Class of Treasury Stock [Line Items]
Award vested (in shares)																125,000
Inducement Option Award | Vesting Period Two
Equity, Class of Treasury Stock [Line Items]
Options vesting percentage																25.00%
Inducement Option Award | Common Stock
Equity, Class of Treasury Stock [Line Items]
Shares issued (in dollars per share)													$ 13.00	$ 13.00		$ 13.00
2022 Directors Plan
Equity, Class of Treasury Stock [Line Items]
Shares reserved for future issuance (in shares)													210,000	210,000		210,000						300,000
Stock options granted (in shares)																120,000
Amended 2022 Directors' Plan
Equity, Class of Treasury Stock [Line Items]
Increase in shares reserved for future issuance (in shares)																			150,000
Amended 2010 Directors' Plan
Equity, Class of Treasury Stock [Line Items]
Number of shares authorized (in shares)											775,000
2022 Plan
Equity, Class of Treasury Stock [Line Items]
Shares reserved for future issuance (in shares)													862,035	862,035		862,035
Increase in shares reserved for future issuance (in shares)																						1,000,000
Common stock issued (in shares)													1,005,000	1,005,000		1,005,000
2022 Plan | Stock Options
Equity, Class of Treasury Stock [Line Items]
Stock options granted (in shares)	250,000
Exercise price (in dollars per share)			$ 9.00
Award vesting period (in years)	3 years		5 years
Estimated fair value at date of grant	$ 99,000		$ 2,700,000
Exercise price (in price per share)	$ 10.00
2022 Plan | Stock Options | Vesting Period One
Equity, Class of Treasury Stock [Line Items]
Options vesting percentage	25.00%
2022 Plan | Stock Options | Vesting Period Two
Equity, Class of Treasury Stock [Line Items]
Options vesting percentage	75.00%
2022 Plan | CEO and CFO | Stock Options
Equity, Class of Treasury Stock [Line Items]
Stock options granted (in shares)			550,000
Amended 2022 Plan
Equity, Class of Treasury Stock [Line Items]
Increase in shares reserved for future issuance (in shares)																			700,000
Amended 2010 Plan
Equity, Class of Treasury Stock [Line Items]
Conversion shares (in shares)											4,900,000
2018 Stock Incentive Plan
Equity, Class of Treasury Stock [Line Items]
Stock options exercised (in shares)																1,100,000	0
2018 Stock Incentive Plan | CEO Options
Equity, Class of Treasury Stock [Line Items]
Exercise price (in dollars per share)							$ 0.60
2018 Stock Incentive Plan | Chief Executive Officer
Equity, Class of Treasury Stock [Line Items]
Stock options granted (in shares)												2,300,000
Stock issued during period (in shares)												2,300,000
Share Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Shares repurchased (in shares)																69,628