pre_text: Results of Operations (2) Operating expenses include stock-based compensation expense as follows (in thousands):
table: Year Ended December 31,
table: 2019 2018 2017
table: Stock-based compensation expense data:
table: Sales and marketing $2,075 $1,196 $561
table: General and administrative 6,474 4,901 2,638
table: Research and development 12,054 7,332 4,214
table: Total stock-based compensation expense $20,603 $13,429 $7,413
question: Analyse this data from a financial earnings document. What was the change in sales and marketing between 2017 and 2018?