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Stock Based Compensation and Other Benefit Plans | 12 Months Ended
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Dec. 31, 2022
Stock Based Compensation and Other Benefit Plans |
Stock Based Compensation | 9. Stock Based Compensation and Other Benefit Plans The Company may grant qualified and non-qualified stock options, common stock and other stock-based awards under various plans to directors, officers, employees and other individuals. Stock options are granted at exercise prices of not less than the fair market value of the Company’s common stock on the date of grant. Additionally, the Company has an ESPP that allows employees to purchase Company shares at a purchase price equal to 85% of the lower of the fair market value of the Company’s common stock on the first trading day of the offering period or on the last day of the offering period. Employee Stock Purchase Plan In May 2015, the Company’s stockholders approved the 2015 Employee Stock Purchase Plan (the “2015 ESPP”), which replaced the Company’s legacy 1998 ESPP. Under the 2015 ESPP, the Company reserved 15,000 shares of common stock for issuance as of its effective date of July 1, 2015, subject to adjustment in the event of a stock split, stock dividend, combination or reclassification or similar event. The 2015 ESPP allows eligible employees to purchase shares of the Company’s common stock at a discount through payroll deductions of up to 10% of their eligible compensation, subject to any plan limitations. The 2015 ESPP provides for six-month offering periods ending on May 31 and November 30 of each year. At the end of each offering period, employees are able to purchase shares at 85% of the lower of the fair market value of the Company’s common stock on the first trading day of the offering period or on the last day of the offering period. In February 2017, the Compensation Committee and the Board of Directors adopted, and in May 2017, the Company’s stockholders approved, an amendment to the Company’s 2015 ESPP. The amendment (a) increased by 250,000 the shares of common stock (from 15,000 shares to a total of 265,000 shares) available for issuance under the 2015 ESPP; and (b) increased the maximum number of shares of common stock an employee may purchase in any offering period to 2,500. As of December 31, 2022, the Company had 230,937 remaining authorized shares available for purchase under the ESPP. During the years ended December 31, 2022 and 2021, employees purchased 6,090 and 2,225 shares of common stock, respectively, under the 2015 ESPP. Deferred Savings Plan Under section 401(k) of the Internal Revenue Code of 1986, the Board of Directors adopted, effective June 1, 1987, a tax-qualified deferred compensation plan for employees of the Company. Participants may make contributions which defer up to 50% of their eligible compensation per payroll period, up to a maximum for 2022 and 2021 of $20,500 and $19,500, respectively (or $27,000 and $26,000, respectively, for employees over 50 years of age). The Company may, at its sole discretion, make contributions each plan year, in cash or in shares of the Company’s common stock, in amounts which match up to 50% of the salary deferred by the participants. The expense related to these contributions was $0.1 million for the years ended December 31, 2022 and 2021, and 100% was paid in common stock for each year. The Company applies shares from plan forfeitures of terminated employees toward the Company’s matching contribution. Stock Option Plans In May 2010, the Compensation Committee and Board of Directors adopted, and in July 2010 the Company’s stockholders approved the 2010 Plan. The 2010 Plan was amended in 2016, 2017 and 2019 to (a) increase the number of shares of common stock issuable under the 2010 Plan; (b) increase the number of shares of common stock issuable under the 2010 Plan as incentive stock options; and (c) extend the term of the 2010 Plan to April 1, 2029. From the 2010 Plan, the Company grants stock options to eligible employees, consultants and directors. Stock-based awards granted under the 2010 Plan may be exercised when vested and generally expire ten years from the date of the grant or three months from the date of termination of employment (longer in case of death, certain retirements or subject to certain terminations pursuant to the Retention Plan). As of December 31, 2022, the Company had 192,964 shares available for grant under the 2010 Plan. As of December 31, 2022, options to purchase 2,025,542 shares of common stock were outstanding under the 2010 Plan. Stock Options Stock options generally vest monthly over three years for employees and one year for directors. Stock options held by employees who qualify for retirement age (defined as employees that are a minimum of 55 years of age and the sum of their age plus years of full-time employment with the Company exceeds 70 years) vest on the earlier of scheduled vest date or the date of retirement. Stock Option Plans Summary The following table summarizes the Company’s stock option activity for the year ended December 31, 2022. ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted |  | Weighted | ​ | ​
​ | ​ | ​ | ​ | Average | ​ | Average | ​ | Aggregate
​ | ​ | ​ | ​ | Exercise | ​ | Contractual | ​ | Intrinsic
​ | ​ | Number of | ​ | Price | ​ | Remaining Term | ​ | Value
​ | ​ | shares | ​ | Per Share | ​ | (in years) | ​ | (in thousands)
Outstanding at January 1, 2022 | ​ | ​ | 1,911,177 | ​ | $ | 20.64 |  | ​ | 6.33 | ​ | $ | 15,103
Granted |  | ​ | 292,972 | ​ |  | 19.40 |  | ​ |  |  | ​ |
Exercised |  | ​ | (128,811) | ​ |  | 7.22 |  | ​ |  |  | ​ |
Forfeited, expired or cancelled | ​ | ​ | (49,796) | ​ |  | 64.30 |  | ​ |  |  | ​ |
Outstanding at December 31, 2022 | ​ | ​ | 2,025,542 | ​ | $ | 20.24 |  | ​ | 6.10 | ​ | $ | 10,804
Exercisable at December 31, 2022 | ​ | ​ | 1,718,864 | ​ | $ | 19.67 |  | ​ | 5.56 | ​ | $ | 10,764
​ The aggregate intrinsic value of stock options exercised in 2022 and 2021 was $2.8 million and $1.6 million, respectively. The weighted-average grant-date fair value per share of the options granted in 2022 and 2021 was $12.01 and $22.23, respectively. As of December 31, 2022, $4.0 million of total unrecognized compensation expense related to stock options is expected to be recognized over a weighted average period of 1.8 years. Stock-based Compensation Expense The fair value of stock options granted during the years ended December 31, 2022 and 2021, was estimated based on the following weighted average assumptions for: ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31, |
​ |  | 2022 |  | 2021 |
Dividend yield |  | 0 | % | 0 | %
Expected volatility |  | 69 | % | 83 | %
Risk-free interest rate |  | 2.68 | % | 0.95 | %
Expected term |  | 5.64 years | ​ | 5.66 years | ​
​ All stock-based compensation expense is recorded in G&A expense. The following table shows total stock-based compensation expense for stock options and ESPP in the consolidated statements of operations and comprehensive (loss) income (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
​ |  | 2022 |  | 2021
Total stock-based compensation expense included in G&A | ​ | $ | 3,608 | ​ | $ | 6,195
​ ​ ​ ​ ​ ​ ​ ​ Thomas Burns Equity Awards Modification ​ In April 2022 and November 2022, the Company entered into letter agreements with Thomas Burns that amended and supplemented his amended and restated employment agreement. Pursuant to the November 2022 Letter Agreement, in the event Mr. Burns remains employed by the Company for a twelve-month period beginning on November 1, 2022, he will be deemed “retirement eligible” for purposes of his equity awards under the terms of his equity award agreements. All other terms of his amended and restated employment agreement remain the same. Conditioned on his execution of a release in favor of the Company, Mr. Burns will also receive this benefit upon any involuntary termination for reasons other than cause. The unrecognized stock compensation cost for the unvested stock options as of November 1, 2022 will be recognized over the shorter of (1) twelve months and (2) the remaining original vesting period (the “Revised Vesting Term”). During the year ended December 31, 2022, the Company recognized stock-based compensation expense of $0.6 million related to the Mr. Burns’ option awards. As of December 31, 2022, there was $0.5 million total unrecognized compensation expense related to Mr. Burns’ stock options expected to be recognized through the earlier of the vesting date of the option or October 31, 2023. ​ Employee Retention Bonus ​ On October 25, 2022, the Company approved the Amended Retention Plan which provides that each of its current employees, excluding the CEO, will be eligible to receive a cash retention bonus if employed through each of two periods: (1) the three-month anniversary of November 1, 2022 (the “Initial Period”) and (2) the nine-month period immediately following the Initial Period. All other terms of the Amended Retention Plan remain consistent with the Retention Plan. The Company will accrue and recognize the cost of the cash retention bonus as expense on a straight-line basis from November 1, 2022 through October 31, 2023. Pursuant to Amended Retention Plan, as of December 31, 2022, the Company expects to pay $0.8 million in 2023 related to the cash retention bonuses. The Company accrued $0.1 million for cash retention bonuses in operating expenses in the consolidated statement of operations and comprehensive loss (income) during the year ended December 31, 2022. James R. Neal Departure and Continuity Incentive ​ On December 30, 2022, the Company’s board of directors (“the Board”) appointed Owen Hughes as Executive Chairman of the Board and Interim Chief Executive Officer (“CEO”) effective January 1, 2023 and, in connection with Mr. Hughes’ appointment, James R. Neal retired as the Company’s CEO effective as of December 31, 2022 (the “Departure Date”) and resigned as a member of the Board and Chairman of the Board, effective as of January 1, 2023. Pursuant to Mr. Neal’s Amended and Restated Employment Agreement, dated December 15, 2021, by and between the Company and Mr. Neal, following the Departure Date, Mr. Neal is entitled to a cash payment of $1.2 million (the “Continuity Incentive”) which will be made in equal monthly installments starting in January 2023 through December 2023, less deductions and withholdings. The Company accrued the full $1.2 million Continuity Incentive in operating expenses in the consolidated statement of operations and comprehensive loss (income) during the year ended December 31, 2022. ​

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- Definition The entire disclosure for an entity's employee compensation and benefit plans, including, but not limited to, postemployment and postretirement benefit plans, defined benefit pension plans, defined contribution plans, non-qualified and supplemental benefit plans, deferred compensation, share-based compensation, life insurance, severance, health care, unemployment and other benefit plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI https://asc.fasb.org/topic&trid=2228938 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 712 -URI https://asc.fasb.org/topic&trid=2197446 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -URI https://asc.fasb.org/topic&trid=2127225 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI https://asc.fasb.org/topic&trid=2235017 + Details
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