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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) $ in Thousands | Total | Common Stock | Capital in excess of Par Value | (Accumulated Deficit) Retained Earnings | Accumulated Other Comprehensive Loss | Treasury Stock
--- | --- | --- | --- | --- | --- | ---
Balance (in shares) at Dec. 31, 2017 |  | 17,677,000 |  |  |  | (1,708,000)
Balance at Dec. 31, 2017 | $ 68,986 | $ 354 | $ 48,349 | $ 29,549 | $ (3,430) | $ (5,836)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Issuance of common stock upon the exercise of stock options (in shares) |  | 168,000 |  |  |  |
Issuance of common stock upon the exercise of stock options | 866 | $ 3 | 863 |  |  |
Net issuance of restricted stock awards (in shares) |  | 34,000 |  |  |  |
Net issuance of restricted stock awards | 0 |  |  |  |  |
Stock-based compensation | 1,039 |  | 1,039 |  |  |
Foreign currency translation adjustments | (823) |  |  |  | (823) |
Net loss | (24,122) |  |  | (24,122) |  |
Balance (in shares) at Dec. 31, 2018 |  | 17,879,000 |  |  |  | (1,708,000)
Balance at Dec. 31, 2018 | 45,946 | $ 357 | 50,251 | 5,427 | (4,253) | $ (5,836)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Issuance of common stock upon the exercise of stock options (in shares) |  | 256,000 |  |  |  |
Issuance of common stock upon the exercise of stock options | 1,433 | $ 5 | 1,428 |  |  |
Net issuance of restricted stock awards (in shares) |  | 225,000 |  |  |  |
Net issuance of restricted stock awards | 0 | $ 5 | (5) |  |  |
Issuance of restricted stock for acquisition | 27,527 |  | 27,527 |  |  |
Treasury stock acquired from employees upon exercise of stock options (in shares) |  |  |  |  |  | (23,000)
Treasury stock acquired from employees upon exercise of stock options | (544) |  |  |  |  | $ (544)
Stock-based compensation | 2,706 |  | 2,706 |  |  |
Equity component of issued convertible notes | 12,465 |  | 12,465 |  |  |
Foreign currency translation adjustments | (1,115) |  |  |  | (1,115) |
Net loss | $ (15,571) |  |  | (15,571) |  |
Balance (in shares) at Dec. 31, 2019 | 16,629,177 | 18,360,000 |  |  |  | (1,731,000)
Balance at Dec. 31, 2019 | $ 72,847 | $ 367 | 94,372 | (10,144) | (5,368) | $ (6,380)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Issuance of common stock upon the exercise of stock options (in shares) | 47,000 | 47,000 |  |  |  |
Issuance of common stock upon the exercise of stock options | $ 675 | $ 1 | 674 |  |  |
Net issuance of restricted stock awards (in shares) |  | 29,000 |  |  |  |
Net issuance of restricted stock awards | 835 | $ 1 | 834 |  |  |
Net issuance of restricted stock units (in shares) |  | 23,000 |  |  |  |
Issuance of restricted stock for acquisition (in shares) |  | 908,000 |  |  |  |
Issuance of restricted stock for acquisition | 18 | $ 18 |  |  |  |
Treasury stock acquired from employees upon exercise of stock options (in shares) |  |  |  |  |  | (57,000)
Treasury stock acquired from employees upon exercise of stock options | (1,186) |  | (143) |  |  | $ (1,043)
Stock-based compensation | 4,251 |  | 4,251 |  |  |
Equity component of issued convertible notes | 19,060 |  | 19,060 |  |  |
Equity component of redeemed 2024 convertible notes (net of deferred taxes of $3.0 million) | (4,372) |  | (6,808) |  |  | $ 2,436
Equity component of redeemed 2024 convertible notes (net of deferred taxes of $1.8 million) (in shares) |  |  |  |  |  | 722,000
Proceeds from public share offering, net of issuance costs of $0.9 million (in shares) |  | 3,616,000 |  |  |  |
Proceeds from public share offering, net of issuance costs of $6.0 million) | 131,407 | $ 72 | 131,335 |  |  |
Foreign currency translation adjustments | 1,432 |  |  |  | 1,432 |
Net loss | $ (36,562) |  |  | (36,562) |  |
Balance (in shares) at Dec. 31, 2020 | 21,917,357 | 22,983,000 |  |  |  | (1,066,000)
Balance at Dec. 31, 2020 | $ 188,405 | $ 459 | $ 243,575 | $ (46,706) | $ (3,936) | $ (4,987)

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