Fair Value Measurements (Warrants Outstanding) (Details)	Sep. 30, 2022 $ / shares shares
Class of Warrant or Right [Line Items]
Number of underlying warrant shares	338,583
Hale Capital, LLP
Class of Warrant or Right [Line Items]
Number of underlying warrant shares	238,583
Warrant exercise price (per share) | $ / shares	$ 2.80
Warrant expiration date	Oct. 21, 2026
iStudy Co., Ltd.
Class of Warrant or Right [Line Items]
Number of underlying warrant shares	100,000
Warrant exercise price (per share) | $ / shares	$ 2.43
Warrant expiration date	Aug. 31, 2028