pre_text: A10 NETWORKS, INC. CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (in thousands)
table: Years Ended December 31,
table: 2019 2018 2017
table: Net loss $(17,819) $(27,617) $(10,751)
table: Other comprehensive loss, net of tax:
table: Unrealized gain (loss) on marketable securities 395 (21) (78)
table: Comprehensive loss $(17,424) $(27,638) $(10,829)
question: Analyse this data from a financial earnings document. What is the company's total unrealized gain on marketable securities between 2017 to 2019?