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Stock-based Compensation | 9 Months Ended
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Jun. 30, 2019
Share-based Payment Arrangement [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 nine months ended June 30, 2019 and June 30, 2018, respectively.
| Three Months Ended |  | Nine Months Ended
| June 30, |  | June 30,
in thousands | 2019 |  | 2018 |  | 2019 |  | 2018
Stock-based compensation expense | $ | 3,699 |  |  | $ | 2,484 |  |  | $ | 7,993 |  |  | $ | 7,692 |
Stock Options Following is a summary of stock option activity for the nine months ended June 30, 2019:
| Nine Months Ended
| June 30, 2019
| Shares |  | Weighted Average Exercise Price
Outstanding at beginning of period | 533,052 |  |  | $ | 14.26 |
Granted | 30,782 |  |  | 10.23 |
Exercised | (26,650 | ) |  | 10.44 |
Cancelled | (7,944 | ) |  | 10.63 |
Outstanding at end of period | 529,240 |  |  | $ | 14.27 |
Exercisable at end of period | 475,887 |  |  | $ | 14.35 |
Vested or expected to vest in the future | 526,383 |  |  | $ | 14.30 |
As of June 30, 2019 and September 30, 2018, total unrecognized compensation cost related to unvested stock options was $0.2 million and $0.2 million, respectively. The remaining cost as of June 30, 2019 is expected to be recognized over a weighted-average period of 1.3 years. Restricted Stock Awards During the nine months ended June 30, 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 nine months ended June 30, 2019:
| Nine Months Ended June 30,
| 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 |  |  | 446,089 |  |  | 913,908 |
Vested (a) | (309,843 | ) |  | (205,795 | ) |  | (515,638 | )
Forfeited | (7,020 | ) |  | (29,498 | ) |  | (36,518 | )
End of period | 795,741 |  |  | 642,579 |  |  | 1,438,320 |
(a) Grant and vesting activity during the nine months ended June 30, 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 June 30, 2019 and September 30, 2018, total unrecognized compensation cost related to unvested restricted stock awards was $11.3 million and $8.8 million, respectively. The remaining cost as of June 30, 2019 is expected to be recognized over a weighted average period of 1.8 years.

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- Definition The entire disclosure for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 + Details
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