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Equity | 6 Months Ended
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Jun. 30, 2023
Equity |
Equity | 14. Equity ​ The changes in shareholders’ equity for the three and six months ended June 30, 2023 were as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ |  | Additional | ​ | ​ | ​ | ​ | ​ |  | ​ | ​ |  | Accumulated Other | ​ | Total
​ | Common Stock |  | Paid- In | ​ | Treasury Stock | ​ | Accumulated |  | Comprehensive | ​ | Shareholders’
​ | Shares |  | ​ | Amount |  | Capital | ​ | Shares | ​ | ​ | Amount |  | Deficit |  | Loss | ​ | Equity
Balance, December 31, 2022 | 37,084,759 | ​ | $ | 37 | ​ | $ | 538,073 | ​ | (3,235,823) | ​ | $ | (61,924) | ​ | $ | (281,344) | ​ | $ | — | ​ | $ | 194,842
Exercise of common stock options | 234,132 | ​ | ​ | — | ​ | ​ | 3,848 | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 3,848
Issuance for employee stock purchase plan | 11,329 | ​ | ​ | — | ​ | ​ | 169 | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 169
Vesting of RSUs and PSUs | 775,904 | ​ | ​ | 1 | ​ | ​ | — | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 1
Shares withheld for employee taxes upon vesting of RSUs and PSUs | (289,281) | ​ | ​ | — | ​ | ​ | (7,736) | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (7,736)
Stock-based compensation | — | ​ | ​ | — | ​ | ​ | 6,035 | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 6,035
Net loss | — | ​ | ​ | — | ​ | ​ | — | ​ | — | ​ | ​ | — | ​ | ​ | (17,426) | ​ | ​ | — | ​ | ​ | (17,426)
Balance, March 31, 2023 | 37,816,843 | ​ | $ | 38 | ​ | $ | 540,389 | ​ | (3,235,823) | ​ | $ | (61,924) | ​ | $ | (298,770) | ​ | $ | — | ​ | $ | 179,733
Exercise of common stock options | 72,405 | ​ | ​ | — | ​ | ​ | 1,251 | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 1,251
Vesting of RSUs and PSUs | 73,805 | ​ | ​ | — | ​ | ​ | — | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Shares withheld for employee taxes upon vesting of RSUs and PSUs | (9,655) | ​ | ​ | — | ​ | ​ | (220) | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (220)
Stock-based compensation | — | ​ | ​ | — | ​ | ​ | 7,072 | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 7,072
Other comprehensive loss, net of tax | — | ​ | ​ | — | ​ | ​ | — | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (38) | ​ | ​ | (38)
Net income | — | ​ | ​ | — | ​ | ​ | — | ​ | — | ​ | ​ | — | ​ | ​ | 13,007 | ​ | ​ | — | ​ | ​ | 13,007
Balance, June 30, 2023 | 37,953,398 | ​ | $ | 38 | ​ | $ | 548,492 | ​ | (3,235,823) | ​ | $ | (61,924) | ​ | $ | (285,763) | ​ | $ | (38) | ​ | $ | 200,805
​ The changes in shareholders’ equity for the three and six months ended June 30, 2022 were as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ |  | Additional | ​ | ​ | ​ | ​ | ​ |  | ​ | ​ |  | Total
​ | Common Stock |  | Paid- In | ​ | Treasury Stock | ​ | Accumulated |  | Shareholders’
​ | Shares |  | ​ | Amount |  | Capital | ​ | Shares | ​ | ​ | Amount |  | Deficit |  | Equity
Balance, December 31, 2021 | 35,806,119 | ​ | $ | 36 | ​ | $ | 502,095 | ​ | (2,150,717) | ​ | $ | (42,861) | ​ | $ | (256,342) | ​ | $ | 202,928
Exercise of common stock options | 190,074 | ​ | ​ | — | ​ | ​ | 3,261 | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 3,261
Issuance for employee stock purchase plan | 13,421 | ​ | ​ | — | ​ | ​ | 203 | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 203
Vesting of RSUs and PSUs | 563,050 | ​ | ​ | — | ​ | ​ | — | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Shares withheld for employee taxes upon vesting of RSUs and PSUs | (191,667) | ​ | ​ | — | ​ | ​ | (3,382) | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (3,382)
Share repurchases | — | ​ | ​ | — | ​ | ​ | 5,000 | ​ | (307,132) | ​ | ​ | (5,000) | ​ | ​ | — | ​ | ​ | —
Stock-based compensation | — | ​ | ​ | — | ​ | ​ | 6,135 | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 6,135
Net loss | — | ​ | ​ | — | ​ | ​ | — | ​ | — | ​ | ​ | — | ​ | ​ | (13,069) | ​ | ​ | (13,069)
Balance, March 31, 2022 | 36,380,997 | ​ | $ | 36 | ​ | $ | 513,312 | ​ | (2,457,849) | ​ | $ | (47,861) | ​ | $ | (269,411) | ​ | $ | 196,076
Exercise of common stock options | 102,283 | ​ | ​ | — | ​ | ​ | 1,545 | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 1,545
Vesting of RSUs and PSUs | 111,056 | ​ | ​ | 1 | ​ | ​ | — | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 1
Shares withheld for employee taxes upon vesting of RSUs and PSUs | (26,506) | ​ | ​ | — | ​ | ​ | (511) | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (511)
Stock-based compensation | — | ​ | ​ | — | ​ | ​ | 5,692 | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 5,692
Net loss | — | ​ | ​ | — | ​ | ​ | — | ​ | — | ​ | ​ | — | ​ | ​ | (5,191) | ​ | ​ | (5,191)
Balance, June 30, 2022 | 36,567,830 | ​ | $ | 37 | ​ | $ | 520,038 | ​ | (2,457,849) | ​ | $ | (47,861) | ​ | $ | (274,602) | ​ | $ | 197,612
​ Common Stock ​ In May 2015, the Company adopted the Amended and Restated 2014 Stock Incentive Plan (the “Plan”), under which an aggregate of 2,700,000 shares of common stock were authorized for issuance to employees, officers, directors, consultants and advisors of the Company, plus an annual increase on the first day of each fiscal year until the expiration of the Plan equal to 4% of the total number of outstanding shares of common stock on December 31st of the immediately preceding calendar year (or a lower amount as otherwise determined by the Company’s board of directors (“Board of Directors”) prior to January 1st). As of June 30, 2023, there were 1,846,667 shares of common stock available for issuance pursuant to the Plan. The Plan provides for granting of both Internal Revenue Service qualified incentive stock options and non-qualified options, restricted stock awards, restricted stock units and performance stock units. The Company’s qualified incentive stock options, non-qualified options and restricted stock units generally vest ratably over a four-year period of service. The stock options generally have a ten-year contractual life and, upon termination, vested options are generally exercisable for three months following the termination date, while unvested options are forfeited immediately upon termination. Refer to Note 15, Stock-based Compensation, for more information. ​ Share Repurchases In August 2021, the Board of Directors authorized a share repurchase program to repurchase up to $100,000 of outstanding shares of the Company’s common stock at any time or times through December 31, 2022 (the “Prior Repurchase Program”). The Prior Repurchase Program permitted the Company to effect repurchases through a variety of methods, including open-market purchases (including pursuant to a trading plan adopted in accordance with Rule 10b5-1 of the Exchange Act), privately negotiated transactions, or otherwise in compliance with Rule 10b-18 of the Exchange Act. Shares repurchased under the Prior Repurchase Program were returned to the Company’s pool of authorized but unissued shares available for reissuance. The timing and amount of any such repurchases were determined based on share price, market conditions, legal requirements, and other relevant factors. Through December 31, 2022, the Company repurchased 3,235,823 shares at a weighted-average price of $19.14 per share for a total of $61,924 under the Prior Repurchase Program and the cost of repurchased shares were recorded as treasury stock in the Consolidated Balance Sheet. The Prior Repurchase Program expired on December 31, 2022. In January 2023, the Board of Directors authorized a share repurchase program to repurchase up to $100,000 of the Company’s common stock through December 31, 2023 (the “2023 Repurchase Program”). The 2023 Repurchase Program permits the Company to effect repurchases through a variety of methods, including open-market purchases (including pursuant to a trading plan adopted in accordance with Rule 10b5-1 of the Exchange Act), privately negotiated transactions, or otherwise in compliance with Rule 10b-18 of the Exchange Act. The timing and amount of any shares purchased on the open market will be determined based on the Company’s evaluation of the market conditions, share price and other factors. The Company plans to utilize existing cash on hand to fund the 2023 Repurchase Program. As of June 30, 2023, the Company has not yet repurchased shares under the 2023 Repurchase Program. Thus, $100,000 remained available for share repurchases under the 2023 Repurchase Program as of June 30, 2023.

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