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Stockholders' Equity (Tables) | 3 Months Ended
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Mar. 31, 2021
Schedule of allocation of total stock-based compensation expense | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended
​ | ​ | March 31,
(In thousands) |  | 2021 |  | 2020
Cost of revenue | ​ | $ | 111 | ​ | $ | 82
Sales and marketing expenses | ​ | ​ | 978 | ​ | ​ | 1,246
Research and development expenses | ​ | ​ | 97 | ​ | ​ | 88
Reimbursement, general and administrative expenses | ​ | ​ | 1,271 | ​ | ​ | 1,312
Total stock-based compensation expense | ​ | $ | 2,457 | ​ | $ | 2,728
Schedule of stock option activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ | Weighted- | ​ | Weighted- | ​ | ​ | ​
​ | ​ | ​ | ​ | Average | ​ | Average | ​ | Aggregate
​ | ​ | Options | ​ | Exercise Price | ​ | Remaining | ​ | Intrinsic
(In thousands except options and per share data) | ​ | Outstanding | ​ | Per Share (1) | ​ | Contractual Life | ​ | Value (2)
Balance at December 31, 2020 | ​ | 1,039,709 | ​ | $ | 36.43 | ​ | 5.6 years | ​ | $ | 13,381
Granted | ​ | 132,606 | ​ | $ | 51.60 | ​ | ​ | ​ | ​ | ​
Exercised | ​ | (53,967) | ​ | $ | 24.00 | ​ | ​ | ​ | $ | 1,516
Forfeited | ​ | (10,866) | ​ | $ | 46.28 | ​ | ​ | ​ | ​ | ​
Cancelled/Expired | ​ | (5,982) | ​ | $ | 46.18 | ​ | ​ | ​ | ​ | ​
Balance at March 31, 2021 | ​ | 1,101,500 | ​ | $ | 38.72 | ​ | 5.6 years | ​ | $ | 18,893
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Options exercisable at March 31, 2021 | ​ | 546,067 | ​ | $ | 30.27 | ​ | 4.7 years | ​ | $ | 14,229
​
(1) | The exercise price of each option granted during the period shown was equal to the market price of the underlying stock on the date of grant.
(2) | The aggregate intrinsic value of options exercised represents the difference between the exercise price of the option and the closing stock price of our common stock on the date of exercise. The aggregate intrinsic value of options outstanding represents the difference between the exercise price of the option and the closing stock price of our common stock on the last trading day of the period.
Time-Based Restricted Stock Units |
Schedule of stock-settled restricted stock unit activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted- | ​ | ​ | ​
​ |  | ​ |  | Average Grant |  | Aggregate
​ | ​ | Units | ​ | Date Fair Value | ​ | Intrinsic
(In thousands except unit and per unit data) | ​ | Outstanding | ​ | Per Unit | ​ | Value (1)
Balance at December 31, 2020 | ​ | 211,469 | ​ | $ | 48.29 | ​ | $ | 9,503
Granted | ​ | 48,893 | ​ | $ | 51.60 | ​ | ​ | ​
Vested | ​ | (61,682) | ​ | $ | 49.49 | ​ | ​ | ​
Cancelled | ​ | (3,382) | ​ | $ | 54.25 | ​ | ​ | ​
Balance at March 31, 2021 | ​ | 195,298 | ​ | $ | 48.63 | ​ | $ | 10,642
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Deferred and unissued at March 31, 2021(2) | ​ | 6,469 | ​ | $ | 38.94 | ​ | $ | 352
​
(1) | The aggregate intrinsic value of restricted stock units outstanding was based on our closing stock price on the last trading day of the period.
(2) | For the three months ended March 31, 2021, there were no restricted stock units granted to non-employee directors in lieu of their quarterly cash retainer payments. As of March 31, 2021, there were 6,469 outstanding restricted stock units that had been previously granted to non-employee directors in lieu of their quarterly cash retainer payments.
Performance-based stock-settled restricted stock units |
Schedule of stock-settled restricted stock unit activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Performance- | ​ | Weighted- | ​ | ​ | ​
​ |  | Based |  | Average Grant |  | Aggregate
​ | ​ | Units | ​ | Date Fair Value | ​ | Intrinsic
(In thousands except unit and per unit data) | ​ | Outstanding | ​ | Per Unit | ​ | Value (1)
Balance at December 31, 2020 | ​ | 79,303 | ​ | $ | 47.83 | ​ | $ | 3,564
Granted | ​ | 35,929 | ​ | $ | 51.60 | ​ | ​ | ​
Vested | ​ | (34,159) | ​ | $ | 33.98 | ​ | ​ | ​
Cancelled | ​ | (19,032) | ​ | $ | 69.17 | ​ | ​ | ​
Balance at March 31, 2021 | ​ | 62,041 | ​ | $ | 51.10 | ​ | $ | 3,381
​
(1) | The aggregate intrinsic value of performance-based restricted stock units outstanding was based on our closing stock price on the last trading day of the period.

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