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Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2023

Schedule of allocation of total stock-based compensation expense

​

​	​	​	​	​	​	​	​	​
​	Year Ended
​	December 31,
(In thousands)	2023			2022			2021
Cost of revenue	$	420	​	$	367	​	$	433
Sales and marketing expenses	​	2,985	​	​	4,060	​	​	4,069
Research and development expenses	​	133	​	​	226	​	​	314
Reimbursement, general and administrative expenses	​	4,009	​	​	4,947	​	​	5,357
Total stock-based compensation expense	$	7,547	​	$	9,600	​	$	10,173

Schedule of estimated fair values and assumptions for stock options granted

​

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

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	​	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
Exercised	​	(4,625)	​	$	2.97	​	​	​	$	98
Forfeited	​	(25,045)	​	$	47.54	​	​	​	​	​
Cancelled/Expired	​	(155,677)	​	$	50.72	​	​	​	​	​
Balance at December 31, 2023	​	429,960	​	$	40.74	​	3.8 years	​	$	223
​	​	​	​	​	​	​	​	​	​	​
Options exercisable at December 31, 2023	​	386,457	​	$	41.53	​	3.7 years	​	$	125

​

(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:	​	2023		​	2022
Non-vested options, beginning of the year	​	​	179,944	​	​	397,908
Non-vested options, end of the year	​	​	43,503	​	​	179,944
Vested options, end of the year	​	​	386,457	​	​	435,363

​

​	​	​	​	​	​	​
​	​	Year Ended
​	​	December 31,
Weighted-average grant date fair value of:	​	2023		​	2022
Non-vested options, beginning of the year	​	$	16.24	​	$	18.02
Non-vested options, end of the year	​	​	13.57	​	​	16.24
Vested options, end of the year	​	​	16.51	​	​	17.53
Forfeited options, during the year	​	​	18.36	​	​	14.73

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	​	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
Granted	​	398,698	​	$	15.52	​	​	​
Vested	​	(270,651)	​	$	20.18	​	​	​
Cancelled	​	(129,447)	​	$	19.79	​	​	​
Balance at December 31, 2023	​	589,142	​	$	16.35	​	$	8,425

​

(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

​

​	​	​	​	​	​	​	​	​
​	​	​	​	Weighted-		​	​	​
​		​		Average Grant			Aggregate
​	​	PSUs	​	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	​	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
Granted	​	123,575	​	$	15.28	​	​	​
Vested	​	(13,842)	​	$	42.70	​	​	​
Cancelled	​	(67,119)	​	$	21.50	​	​	​
Balance at December 31, 2023	​	198,232	​	$	18.93	​	$	2,785

​

(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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