v3.19.3.a.u2

CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Parenthetical) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Statement of Comprehensive Income [Abstract] |  |  |
Unrealized gain (loss) on available-for-sale debt securities, tax | $ 1,148 | $ 0 | $ 0

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