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Comprehensive Income (Loss)
12 Months Ended
Dec. 31, 2018
Comprehensive Income (Loss)  
Comprehensive Income (Loss)

2. Comprehensive Income (Loss)

Comprehensive income (loss) is comprised of net income (loss) and other comprehensive income (loss). For the years ended December 31, 2018 and 2017, the only component of other comprehensive loss is net unrealized losses on marketable debt securities. There were no material reclassifications out of accumulated other comprehensive loss during the year ended December 31, 2018.