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Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2022

Schedule of allocation of total stock-based compensation expense

​

​	​	​	​	​	​	​	​	​
​	Year Ended
​	December 31,
(In thousands)	2022			2021			2020
Cost of revenue	$	367	​	$	433	​	$	539
Sales and marketing expenses	​	4,060	​	​	4,069	​	​	5,058
Research and development expenses	​	226	​	​	314	​	​	360
Reimbursement, general and administrative expenses	​	4,947	​	​	5,357	​	​	4,732
Total stock-based compensation expense	$	9,600	​	$	10,173	​	$	10,689

​

Schedule of estimated fair values and assumptions for stock options granted

​

​	​	​
​		2020
Expected term		4.5 years
Expected volatility		45.39%
Risk-free interest rate		0.4%
Expected dividend yield		0%
Fair value on the date of grant		$13.60 - $14.70

​

​

​	​	​	​	​	​	​
​		2022	​	2021		2020
Expected term		4.5 years	​	4.5 years	​	4.5 years
Expected volatility		59.2%	​	45.0 - 52.3%	​	44.1 - 46.4%
Risk-free interest rate		4.3%	​	0.6 - 1.1%	​	0.2 - 0.9%
Expected dividend yield		0%	​	0%	​	0%
Fair value on the date of grant		$ 8.11	​	$13.04 - $22.90	​	$13.45 - $18.64

​

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, 2019	​	866,955	​	$	28.76	​	6.3 years	​	$	33,957
Granted	​	378,695	​	$	44.84	​	​	​	​	​
Exercised	​	(147,741)	​	$	7.24	​	​	​	$	6,540
Forfeited	​	(54,824)	​	$	50.25	​	​	​	​	​
Cancelled/Expired	​	(3,376)	​	$	63.61	​	​	​	​	​
Balance at December 31, 2020	​	1,039,709	​	$	36.43	​	5.6 years	​	$	13,381
Granted	​	188,748	​	$	49.33	​	​	​	​	​
Exercised	​	(175,516)	​	$	22.65	​	​	​	$	4,901
Forfeited	​	(92,773)	​	$	49.77	​	​	​	​	​
Cancelled/Expired	​	(44,944)	​	$	57.78	​	​	​	​	​
Balance at December 31, 2021	​	915,224	​	$	39.33	​	5.0 years	​	$	2,068
Granted	​	47,280	​	$	6.17	​	​	​	​	​
Exercised	​	(90,878)	​	$	1.68	​	​	​	$	916
Forfeited	​	(92,981)	​	$	36.28	​	​	​	​	​
Cancelled/Expired	​	(163,338)	​	$	37.65	​	​	​	​	​
Balance at December 31, 2022	​	615,307	​	$	43.25	​	4.7 years	​	$	164
​	​	​	​	​	​	​	​	​	​	​
Options exercisable at December 31, 2022	​	435,363	​	$	43.83	​	4.5 years	​	$	84

​

(1) The exercise price of each option granted during the periods 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.

Schedule of Nonvested Share Activity

​

​	​	​	​	​	​	​
​	​	Year Ended
​	​	December 31,
Number of:	​	2022		​	2021
Non-vested options, beginning of the year	​	​	397,908	​	​	549,843
Non-vested options, end of the year	​	​	179,944	​	​	397,908
Vested options, end of the year	​	​	435,363	​	​	517,316

​

​	​	​	​	​	​	​
​	​	Year Ended
​	​	December 31,
Weighted-average grant date fair value of:	​	2022		​	2021
Non-vested options, beginning of the year	​	$	18.02	​	$	18.03
Non-vested options, end of the year	​	​	16.24	​	​	18.02
Vested options, end of the year	​	​	17.53	​	​	13.27
Forfeited options, during the year	​	​	14.73	​	​	19.26

​

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, 2019	​	171,687	​	$	43.74	​	$	11,591
Granted	​	175,582	​	$	46.42	​	​	​
Modification	​	2,288	​	$	21.85	​	​	​
Vested	​	(118,014)	​	$	37.57	​	​	​
Cancelled	​	(20,074)	​	$	53.03	​	​	​
Balance at December 31, 2020	​	211,469	​	$	48.29	​	$	9,503
Granted	​	189,762	​	$	40.31	​	​	​
Vested	​	(106,521)	​	$	47.43	​	​	​
Cancelled	​	(35,563)	​	$	51.76	​	​	​
Balance at December 31, 2021	​	259,147	​	$	42.32	​	$	4,932
Granted	​	539,525	​	$	15.03	​	​	​
Vested	​	(123,528)	​	$	43.20	​	​	​
Cancelled	​	(84,602)	​	$	26.91	​	​	​
Balance at December 31, 2022	​	590,542	​	$	19.42	​	$	6,779

​

(1) The aggregate intrinsic value of time-based restricted stock units outstanding was based on our closing stock price on the last trading day of the period.

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, 2019	​	91,151	​	$	44.63	​	$	6,154
Granted	​	31,731	​	$	50.41	​	​	​
Vested	​	(26,204)	​	$	33.58	​	​	​
Cancelled	​	(17,375)	​	$	52.87	​	​	​
Balance at December 31, 2020	​	79,303	​	$	47.83	​	$	3,564
Granted	​	39,419	​	$	51.82	​	​	​
Vested	​	(34,159)	​	$	33.98	​	​	​
Cancelled	​	(30,246)	​	$	64.39	​	​	​
Balance at December 31, 2021	​	54,317	​	$	50.22	​	$	1,034
Granted	​	131,710	​	$	18.54	​	​	​
Vested	​	(4,407)	​	$	12.31	​	​	​
Cancelled	​	(26,002)	​	$	42.53	​	​	​
Balance at December 31, 2022	​	155,618	​	$	25.05	​	$	1,786

​

(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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Tabular disclosure of the changes in outstanding nonvested shares.

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Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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