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Preferred Stock	12 Months Ended
Preferred Stock	Dec. 31, 2019
Preferred Stock
Preferred Stock	8. Preferred Stock We were authorized to issue up to 10,000,000 shares of convertible preferred stock as of December 31, 2019 and 2018. No shares of convertible preferred stock were issued and outstanding as of December 31, 2019 and 2018.