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Stock-Based Awards (Tables) | 3 Months Ended
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Mar. 31, 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:
|  | March 31, 2018 |
|  | Unrecognized Stock- Based Compensation |  |  | Average Remaining Vesting Period |
Employees and directors restricted stock awards |  | $ | 21,638 |  |  |  | 1.91 |
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 March 31, 2018 is as follows:
|  | Stock Options |  |  | Restricted Stock Awards |  |  | Restricted Stock Units |
Balance at January 1, 2018 |  |  | 1,158,828 |  |  |  | 1,816,666 |  |  |  | 5,678 |
Granted |  |  | — |  |  |  | 730,028 |  |  |  | 7,152 |
Exercised/vested |  |  | (173,291 | ) |  |  | (164,028 | ) |  |  | (734 | )
Forfeitures |  |  | — |  |  |  | (63,609 | ) |  |  | — |
Balance at March 31, 2018 |  |  | 985,537 |  |  |  | 2,319,057 |  |  |  | 12,096 |

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- Definition Tabular disclosure for share-based compensation plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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