NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS – (Continued)
The Company uses a Monte Carlo simulation option-pricing model to determine the fair value of restricted stock units with a service and market condition. The Company used total shareholder return ("TSR") as the performance measurement in the restricted stock units with a service and market condition that were granted in the three months ended March 31, 2019. There were no significant changes in the assumptions used to determine the fair value of restricted stock units with a service and market condition that were granted in 2019 compared to the prior year.
The following table presents, by operating expense category, the Company's stock-based compensation expense recognized in the Company's condensed consolidated statements of operations (in thousands):
Three Months Ended
Cost of revenues
Sales and marketing
General and administrative