12. FAIR VALUE MEASUREMENT - continued
The Group measures property, plant and equipment and operating lease right-of-use assets at fair value on a non-recurring basis when events or changes in circumstances indicate that the carrying amount of these assets or asset group may not be recoverable. The fair value is determined using models with significant unobservable inputs (Level 3 inputs), primarily the management projection of discounted future cash flow and the discount rate. The Group recorded impairment loss on property, plant, and equipment and operating lease right-of-use assets of $Nil, $Nil and $Nil during the years ended December 31, 2020, 2021 and 2022.
The Group measures long-term equity method investment at fair value on a non-recurring basis whenever events or changes in circumstances indicate that the carrying value may no longer be recoverable. The fair value is determined using models with significant unobservable inputs (Level 3 inputs), primarily the management projection of discounted future cash flow and the discount rate. The Group recognized impairment loss of $Nil $Nil and $Nil related to the long-term equity method investment for the years ended December 31, 2020, 2021 and 2022,.
13. ORDINARY SHARES
The Company’s fifth amended and restated Memorandum and Article of Association authorized the Company to issue 990,000,000 ordinary shares with a par value of $0.001 per share.
As of December 31, 2020, there were 22,264,660 and 6,949,141 shares issued for Class A and Class B ordinary shares, respectively; and there were 20,863,613 and 6,949,141 shares outstanding for Class A and Class B ordinary shares, respectively.
As of December 31, 2021, there were 22,264,660 and 6,949,141 shares issued for Class A and Class B ordinary shares, respectively; and there were 21,086,793 and 6,949,141 shares outstanding for Class A and Class B ordinary shares, respectively.
As of December 31, 2022, there were 22,264,660 and 6,949,141 shares issued for Class A and Class B ordinary shares, respectively; and there were 21,251,614 and 6,949,141 shares outstanding for Class A and Class B ordinary shares, respectively.
Share repurchase program
On November 24, 2017, the Company announced that the board of directors of the Company has approved a share repurchase program whereby the Company is authorized to repurchase its own ordinary shares in the form of American depositary shares with an aggregate value of up to $50,000 during the next 12 months. As of December 31, 2022, the Company did not repurchase any shares under this program.
On December 18, 2018, the Company announced that the board of directors of the Company approved another share repurchase program whereby the Company is authorized to repurchase its own ordinary shares in the form of American depositary shares with an aggregate value of up to $12,000 during the next 12 months. Pursuant to this share repurchase plan, the Company repurchased 1,627,455 shares in 2019, with a total consideration of approximately $12,000 at a price range of $6.50 to $8.00 per share, including brokerage commissions. The shares repurchased by the Company were accounted for at cost as treasury stock. The Company has re-issued 226,408, 449,588 and 614,409 repurchased shares for settlement of restricted shares vested as of December 31, 2020, 2021 and 2022, respectively.