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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Proceeds from issuance of common stock,issuance costs | $ 400 | $ 18,607
0.375% Convertible Senior Notes due 2024 |  |
Senior convertible notes |  | 0.375%

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