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Stockholders' Equity | 3 Months Ended
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Sep. 30, 2022
Stockholders' Equity |
Stockholders' Equity | 9. Stockholders’ Equity ​ Stock-based Compensation ​ As of September 30, 2022, we maintained the Amended and Restated 2012 Incentive Award Plan (the “OSI Plan”) as a stock-based employee compensation plan. ​ We recorded stock-based compensation expense in the consolidated statements of operations as follows (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended September 30,
​ |  | 2021 |  | 2022
Cost of goods sold | ​ | $ | 206 | ​ | $ | 216
Selling, general and administrative | ​ | ​ | 6,767 | ​ | ​ | 6,840
Research and development | ​ | ​ | 140 | ​ | ​ | 121
Stock-based compensation expense | ​ | $ | 7,113 | ​ | $ | 7,177
​ As of September 30, 2022, total unrecognized compensation cost related to share-based compensation grants under the OSI Plan were estimated at $0.5 million for stock options and $31.9 million for restricted stock units (“RSUs”). We expect to recognize these costs over a weighted average period of 1.8 years with respect to the stock options and 1.6 years with respect to the RSUs. ​ The following summarizes stock option activity during the three months ended September 30, 2022: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Average | ​ | Weighted-Average | ​ | Aggregate
​ | ​ | Number of | ​ | Exercise | ​ | Remaining Contractual | ​ | Intrinsic Value
​ |  | Options |  | Price |  | Term |  | (in thousands)
Outstanding at June 30, 2022 |  | 110,645 |  | $ | 82.43 |  | ​ | ​ | ​ | ​
Granted |  | — | ​ | ​ | — | ​ | ​ | ​ | ​ | ​
Exercised |  | (2,919) | ​ | ​ | 66.46 | ​ | ​ | ​ | ​ | ​
Expired or forfeited |  | (1,408) | ​ | ​ | 80.45 | ​ | ​ | ​ | ​ | ​
Outstanding at September 30, 2022 |  | 106,318 | ​ | ​ | 82.90 | ​ | 6.1 years | ​ | $ | 162
Exercisable at September 30, 2022 | ​ | 66,027 | ​ | ​ | 77.14 |  | 4.5 years | ​ | $ | 162
​ The following summarizes RSU award activity during the nine months ended September 30, 2022: ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted-
​ | ​ | ​ | ​ | Average
​ |  | Shares |  | Fair Value
Nonvested at June 30, 2022 |  | 427,447 | ​ | $ | 90.17
Granted |  | 324,224 | ​ | ​ | 89.25
Vested |  | (286,119) | ​ | ​ | 97.22
Forfeited |  | (11,420) | ​ | ​ | 88.87
Nonvested at September 30, 2022 |  | 454,132 | ​ | $ | 85.10
​ As of September 30, 2022, there were approximately 0.8 million shares available for grant under the OSI Plan. Under the terms of the OSI Plan, RSUs and restricted stock granted from the pool of shares available for grant reduce the pool by 1.87 shares for each award granted. RSUs and restricted stock forfeited and returned to the pool of shares available for grant increase the pool by 1.87 shares for each award forfeited. ​ We granted 96,620 and 109,594 performance-based RSUs during the three months ended September 30, 2021 and 2022, respectively. These performance-based RSU awards are contingent on the achievement of certain performance metrics. The payout related to these awards can range from zero to 376% of the original number of shares or units awarded. Compensation cost associated with these performance based RSUs are recognized based on the estimated number of shares that we ultimately expect will vest. If the estimated number of shares to vest is revised in the future, then stock-based compensation expense will be adjusted accordingly. ​ Stock Repurchase Program ​ In September 2022, our Board of Directors increased the stock repurchase authorization to a total of 2 million shares. This program does not expire unless our Board of Directors acts to terminate the program. The timing and actual numbers of shares purchased depends on a variety of factors, including stock price, general business and market conditions and other investment opportunities. Repurchases may be made from time to time under the program through open-market purchases or privately-negotiated transactions at our discretion. Upon repurchase, the shares are restored to the status of authorized but unissued shares and we record them in our consolidated financial statements as a reduction in the number of shares of common stock issued and outstanding, with the excess purchase price over par value recorded as a reduction of additional paid-in capital. If additional paid-in capital is reduced to zero, we record the remainder of the excess purchase price over par value as a reduction of retained earnings. ​ During the three months ended September 30, 2022, we repurchased 208,427 shares of our common stock. As of September 30, 2022, there were 1,913,673 shares remaining available for repurchase under the authorized repurchase program. ​ Dividends ​ We have not paid any cash dividends since the consummation of our initial public offering in 1997 and we do not currently intend to pay any cash dividends in the foreseeable future. Our Board of Directors will determine the payment of future cash dividends, if any. Certain of our current bank credit facilities restrict the payment of cash dividends and future borrowings may contain similar restrictions.

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