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Stock-based Compensation | 6 Months Ended
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Mar. 31, 2019
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. Following is a summary of stock-based compensation expense related to stock options and restricted stock awards for the three and six months ended March 31, 2019 and March 31, 2018, respectively.
| Three Months Ended |  | Six Months Ended
| March 31, |  | March 31,
in thousands | 2019 |  | 2018 |  | 2019 |  | 2018
Stock-based compensation expense | $ | 2,180 |  |  | $ | 2,598 |  |  | $ | 4,294 |  |  | $ | 5,208 |
Stock Options Following is a summary of stock option activity for the six months ended March 31, 2019:
| Six Months Ended
| March 31, 2019
| Shares |  | Weighted Average Exercise Price
Outstanding at beginning of period | 533,052 |  |  | $ | 14.26 |
Granted | 25,230 |  |  | 10.38 |
Exercised | (26,650 | ) |  | 10.44 |
Cancelled | (2,319 | ) |  | 9.81 |
Outstanding at end of period | 529,313 |  |  | $ | 14.29 |
Exercisable at end of period | 478,064 |  |  | $ | 14.33 |
Vested or expected to vest in the future | 526,534 |  |  | $ | 14.31 |
As of March 31, 2019 and September 30, 2018, total unrecognized compensation cost related to unvested stock options was $0.3 million and $0.2 million, respectively. The remaining cost as of March 31, 2019 is expected to be recognized over a weighted-average period of 1.5 years. Restricted Stock Awards During the six months ended March 31, 2019, the Company 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 six months ended March 31, 2019:
| Six Months Ended March 31,
| 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 | ) |  | (204,977 | ) |  | (514,820 | )
Forfeited | (7,020 | ) |  | (23,647 | ) |  | (30,667 | )
End of period | 795,741 |  |  | 645,150 |  |  | 1,440,891 |
(a) Grant and vesting activity during the six months ended March 31, 2019 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 March 31, 2019 and September 30, 2018, total unrecognized compensation cost related to unvested restricted stock awards was $13.1 million and $8.8 million, respectively. The remaining cost as of March 31, 2019 is expected to be recognized over a weighted average period of 2.0 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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