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Stock-Based Awards (Tables) | 9 Months Ended
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Sep. 30, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary of Unrecognized Stock-Based Compensation Expense and Average Remaining Vesting Period | A summary of unrecognized stock-based compensation expense and average remaining vesting period is as follows:
|  | September 30, 2019 |
|  | Unrecognized Stock- Based Compensation |  |  | Average Remaining Vesting Period (Years) |
Employees and directors |  | $ | 16,134 |  |  |  | 1.89 |
Summary of Stock Options, Restricted Stock, Restricted Stock Unit and Performance Stock Unit Activity | A summary of stock-based compensation award activity during the three months ended September 30, 2019 is as follows:
|  | Stock |  |  |  |  |  |  |  |  |  |
|  | Options |  |  | RSAs |  |  | RSUs |  |  | PRSUs |
Balance at July 1, 2019 |  |  | 550,537 |  |  |  | 3,231,253 |  |  |  | 40,436 |  |  |  | 270,872 | (1)
Granted |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Exercised/vested |  |  | (25,000 | ) |  |  | (37,607 | ) |  |  | (1,158 | ) |  |  | — |
Forfeitures |  |  | (1 | ) |  |  | (301,826 | ) |  |  | — |  |  |  | (38,262 | )
Balance at September 30, 2019 |  |  | 525,536 |  |  |  | 2,891,820 |  |  |  | 39,278 |  |  |  | 232,610 | (1)
(1) | Represents the target number of PRSUs granted and outstanding. The number of PRSUs that ultimately vest ranges from 0% to 200% of this amount. A Monte Carlo simulation was used to value these awards using the following assumptions for the Company and the peer group: (i) beginning 90-day average stock prices; (ii) valuation date stock prices; (iii) historical stock price volatilities ranging from 22% to 42% (average 28%); (iv) correlation coefficients based upon the price data used to calculate the historical volatilities; (v) a risk free interest rate of 2.56%; and (vi) an expected dividend yield of 0%.

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