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Stock-Based Awards (Tables) | 6 Months Ended
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Jun. 30, 2018
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:
|  | June 30, 2018 |
|  | Unrecognized Stock- Based Compensation |  |  | Average Remaining Vesting Period (Years) |
Employees and directors restricted stock awards |  | $ | 19,646 |  |  |  | 1.85 |
Summary of Stock Options, Restricted Stock and Restricted Stock Unit Activity | A summary of stock options, restricted stock and restricted stock unit activity for the three months ended June 30, 2018 is as follows:
|  | Stock Options |  |  | Restricted Stock Awards |  |  | Restricted Stock Units |
Balance at April 1, 2018 |  |  | 985,537 |  |  |  | 2,319,057 |  |  |  | 12,096 |
Granted |  |  | — |  |  |  | 173,203 |  |  |  | — |
Exercised/vested |  |  | (10,000 | ) |  |  | (145,383 | ) |  |  | — |
Forfeitures |  |  | — |  |  |  | (14,931 | ) |  |  | — |
Balance at June 30, 2018 |  |  | 975,537 |  |  |  | 2,331,946 |  |  |  | 12,096 |

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