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Marketable Securities	12 Months Ended
Marketable Securities	Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]
Marketable Securities	Marketable Securities During the year ended December 31, 2018, our marketable securities consisted of United States Treasury notes and common stock. The United States Treasury notes were classified as available-for-sale and matured in 2019. As of December 31, 2020 and 2019, we did not have any marketable securities. On January 1, 2018 we adopted ASU 2016-01 and reclassified a $1.9 million unrealized gain from cumulative other comprehensive loss to cumulative net income on our consolidated balance sheet. In March 2018, we sold all common stock we held for total proceeds of $23.9 million and recognized a loss of $5.0 million in interest and other income, net during the year ended December 31, 2018.