pre_text: NOTE F – STOCKHOLDERS’ EQUITY (CONTINUED) A summary of restricted stock units granted during the year ended December 31, 2019 is as follows (each restricted stock unit represents the contingent right to receive one share of the Company’s common stock): Restricted stock unit compensation expense was $567,000 for the year ended December 31, 2019 and $687,000 for the year ended December 31, 2018. The Company has an aggregate of $232,000 of unrecognized restricted stock unit compensation expense as of December 31, 2019 to be expensed over a weighted average period of 1.2 years.
table: Number of Shares Weighted-Average Grant Date Fair Value
table: Balance of restricted stock units outstanding at December 31, 2018 505,000 $2.17
table: Grants of restricted stock units 70,000 2.45
table: Vested restricted stock units (235,000) (2.29)
table: Balance of unvested restricted stock units at December 31, 2019 340,000 2.15
question: Analyse this data from a financial earnings document. What is the difference in weighted-average grant date fair value for grants of restricted stock units and vested restricted stock units?