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Stock-based Compensation | 3 Months Ended
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Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Stock-based Compensation | Stock-based Compensation Stock-based compensation expense is included in general and administrative expenses in the condensed consolidated statements of operations. We recognized $2.1 million and $2.6 million of stock-based compensation expense related to stock options and restricted stock awards for the three months ended December 31, 2018 and December 31, 2017, respectively. Stock Options Following is a summary of stock option activity for the three months ended December 31, 2018:
| Three Months Ended
| December 31, 2018
| Shares |  | Weighted Average Exercise Price
Outstanding at beginning of period | 533,052 |  |  | $ | 14.26 |
Granted | 25,230 |  |  | 10.38 |
Exercised | (1,000 | ) |  | 7.56 |
Cancelled | (1,319 | ) |  | 11.53 |
Outstanding at end of period | 555,963 |  |  | $ | 14.10 |
Exercisable at end of period | 504,092 |  |  | $ | 14.13 |
Vested or expected to vest in the future | 552,799 |  |  | $ | 14.13 |
As of December 31, 2018 and September 30, 2018, total unrecognized compensation cost related to unvested stock options was $0.3 million and $0.2 million, respectively. The cost remaining as of December 31, 2018 is expected to be recognized over a weighted-average period of 1.7 years. Restricted Stock Awards During the three months ended December 31, 2018, we issued time-based restricted stock awards that vest ratably over three years on each anniversary from the grant date and performance-based restricted stock awards with a payout subject to the achievement of performance and market conditions over a three-year period. Following is a summary of restricted stock activity for the three months ended December 31, 2018:
| Three Months Ended December 31, 2018
| Performance-Based Restricted Shares |  | Time-Based Restricted Shares |  | Total Restricted Shares
Beginning of period | 644,785 |  |  | 431,783 |  |  | 1,076,568 |
Granted (a) | 467,819 |  |  | 441,991 |  |  | 909,810 |
Vested (a) | (309,843 | ) |  | (196,246 | ) |  | (506,089 | )
Forfeited | (7,020 | ) |  | (21,329 | ) |  | (28,349 | )
End of period | 795,741 |  |  | 656,199 |  |  | 1,451,940 |
(a) Grant and vesting activity during the three months ended December 31, 2018 include 86,050 shares that were issued above target based on the performance level achieved under performance-based restricted stock vesting in the current period. As of December 31, 2018 and September 30, 2018, total unrecognized compensation cost related to unvested restricted stock awards was $14.8 million and $8.8 million, respectively. The remaining cost as of December 31, 2018 is expected to be recognized over a weighted average period of 2.2 years.

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -URI http://asc.fasb.org/subtopic&trid=2208855 + Details
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