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Stock-Based Compensation | 9 Months Ended
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Sep. 30, 2021
Share-based Payment Arrangement [Abstract] |
Stock-Based Compensation | Stock-Based Compensation Effective as of June 19, 2015, the Company's Board adopted the Incentive Award Plan, under which the Company may grant cash and equity incentive awards to eligible employees, directors, and consultants. Time-based restricted stock unit ("RSU") awards granted to employees vest equally on each of the first three anniversaries of the applicable vesting commencement date, subject to the employees' continued service to the Company. The time-based RSU awards granted to directors vest on the earlier of the one-year anniversary of the applicable grant date or the date of the Company's next annual meeting of its shareholders following the grant date, subject to the directors' continued service to the Company. Performance-based RSU awards granted to employees vest at the conclusion of the performance period, subject to the recipients' continued service to the Company and achievement of the specified performance levels. The Company is authorized to grant up to 3,000,000 shares of the Company's common stock pursuant to awards under the Incentive Award Plan. As of September 30, 2021, 1,485,238 shares were available for future issuance under the Incentive Award Plan. On February 18, 2021, the Board approved grants of time-based and performance-based RSUs under the Company's Incentive Award Plan at the most recent estimated NAV per share of $28.90 as of December 1, 2020. On February 23, 2021, the Company announced the expected retirement of its President and Chief Executive Officer in August 2021, which resulted in accelerated recognition of certain stock-based compensation expenses. The Company also announced the appointment of certain executives in establishing a plan of succession. In connection with the appointments, the Board approved one-time grants of time-based RSUs under the Company's Incentive Award Plan at the most recent estimated NAV per share of $28.90 as of December 1, 2020. The following table summarizes the Company's RSU activity during the nine months ended September 30, 2021:
| Unvested Time- Based RSUs |  | Unvested Performance- Based RSUs |  | Weighted-Average Grant Date Price Per Share
Outstanding as of January 1, 2021 | 110,382 |  |  | 332,095 |  |  | $ | 31.40 |
Shares granted | 208,611 |  |  | 218,507 |  |  | $ | 28.90 |
Shares vested | (24,522) |  |  | — |  |  | $ | 31.40 |
Shares forfeited | (13,880) |  |  | (79,562) |  |  | $ | 30.73 |
Outstanding as of September 30, 2021 | 280,591 |  |  | 471,040 |  |  | $ | 30.06 |
As of September 30, 2021, there was $6,072 of total unrecognized compensation expense related to unvested stock-based compensation arrangements that will vest through December 2023. The Company recognized stock-based compensation expense of $2,069 and $6,876 for the three and nine months ended September 30, 2021, respectively, and $1,598 and $3,546 for the three and nine months ended September 30, 2020, respectively. See "Note 1. Organization" for more information regarding the equitable adjustments made to the Company's shares of common stock that may be issued pursuant to the Incentive Award Plan in connection with the reverse stock split.

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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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