Table:
|  | Number of Units | Weighted-Average Grant-Date Fair Value |
| --- | --- | --- |
| Unvested restricted stock units outstanding - December 31, 2017 | 3,106,024 | $3.43 |
| Granted | 853,736 | 1.46 |
| Vested | (1,583,399) | 3.18 |
| Forfeited | (563,400) | 3.39 |
| Unvested restricted stock units outstanding - December 31, 2018 | 1,812,961 | $2.74 |
| Granted | 60,000 | $0.98 |
| Vested | (904,096) | $2.67 |
| Forfeited | (263,450) | $2.71 |
| Unvested restricted stock units outstanding - December 31, 2019 | 705,415 | $2.68 |
Paragraphs:
Restricted Stock Units
The Company intends to settle all vested restricted stock unit payments held by United States-based participants in shares of the Company’s common stock and classifies these awards as equity awards in its Consolidated Balance Sheets. Awards held by participants who are based outside of the United States will be settled in cash and are classified within accrued and other current liabilities on the Consolidated Balance Sheets as of December 31, 2019 and 2018
The following table summarizes the activity related to the unvested restricted stock units during the years ended December 31, 2019 and 2018:
Unrecognized compensation expense related to unvested restricted stock units was $731 at December 31, 2019, which is expected to be recognized as expense over the weighted-average period of 0.7 years.
During the years ended December 31, 2019 and 2018, the Company issued 642,520 and 782,364 shares, respectively, of common stock to participants of the 2016 Plan based in the United States, after withholding approximately 261,335 and 472,965 shares, respectively, to satisfy tax withholding obligations. The Company made a cash payment of $181 and $1,495 to cover employee withholding taxes upon the settlement of these vested restricted stock units during the years ended December 31, 2019 and 2018, respectively. During the years ended December 31, 2019 and 2018, the Company also paid $0 and $300 to cash-settle 16 and 100,025 vested restricted stock units by agreement with the Chief Operating Officer in relation to certain grants made to him and to pay cash in lieu of fractional shares for vested units held by participants based in the United States.
Question:
What is the average number of units forfeited in 2017 and 2018?
Answer: (563400 + 263450)/2  = 413425