Accumulated

Additional

Other

Total

Common Stock

Paid-in

Comprehensive

Accumulated

Shareholders'

Shares

Amount

Capital

Loss

Deficit

Equity

Three Months Ended March 31, 2024:

Balances, December 31, 2023

39,625

$

40

$

381,154

$

(48)

$

(289,418)

$

91,728

Issuance of common stock upon exercise of stock options

5

—

10

—

10

Share-based compensation

—

1,903

—

1,903

Exercise of pre-funded warrants

3,502

3

(3)

—

Acquisition and retirement of treasury shares pursuant to Exchange Agreement

(3,000)

(3)

(5,697)

—

(5,700)

Net change in accumulated other comprehensive loss

—

(30)

—

(30)

Net loss

—

(17,050)

Balances, March 31, 2024

40,132

$

40

$

377,367

$

(78)

$

(306,468)

$

70,861

Three Months Ended March 31, 2023:

Balances, December 31, 2022

36,827

$

37

$

373,813

$

—

$

(232,585)

$

141,265

Share-based compensation

—

1,855

—

1,855

Net change in accumulated other comprehensive loss

—

(132)

—

(132)

Net loss

—

(15,672)

Balances, March 31, 2023

36,827

$

37

$

375,668

$

(132)

$

(248,257)

$

127,316