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Stockholder's Equity | 3 Months Ended
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Mar. 31, 2022
Share-based Payment Arrangement, Noncash Expense [Abstract] |
Stockholder's Equity | Stockholder's Equity (a) Stock Equity and Incentive Plan The Company recognizes stock-based compensation in accordance with the provisions of ASC Topic 718, Compensation-Stock Compensation. Stock-based compensation expense was $859 and $924, excluding $22 and $8 of compensation charges related to our Amended and Restated 1996 Employee Stock Purchase Plan, or the ESPP, for the three months ended March 31, 2022 and 2021, respectively. As of March 31, 2022, there was $2,713 of total unrecognized compensation expense related to stock options, which is expected to be recognized over a weighted-average period of 2.12 years. As of March 31, 2022, there was $2,756 of total unrecognized compensation expense related to restricted stock awards, which is expected to be recognized over a weighted-average period of 1.99 years. Stock Options During the three months ended March 31, 2022, upon the net exercise of 230 stock options, the Company issued 23 shares of common stock, 14 shares were surrendered to the Company to satisfy minimum tax withholding obligations, and 193 shares were cancelled. Additionally, during the three months ended March 31, 2022, no stock options were granted and 170 stock options expired, were canceled or were forfeited. During the three months ended March 31, 2021, 496 stock options were granted. The Company has estimated the fair value of each option grant on the date of grant using the Black-Scholes option-pricing model. The weighted average assumptions utilized to determine the fair value of options granted during the three months ended March 31, 2021 are as follows:
|  |  | Three Months Ended March 31,
|  |  | 2021
Risk-free interest rate |  |  | 0.92 | %
Expected volatility |  |  | 44.98 | %
Expected life (in years) |  |  | 4.28
Dividend yield |  |  | 0 | %
During the three months ended March 31, 2022, there were accelerated vesting and extended exercised term modifications of stock options as it related to the retirement of Mr. Kits van Heyningen, which resulted in a reduction of approximately $85 in compensation cost. During the three months ended March 31, 2022, there were accelerated vesting term modifications of stock options for employees terminated as part of the Company's restructuring, which resulted in a reduction of approximately $81 in compensation cost. As of March 31, 2022, there were 1,727 options outstanding with a weighted average exercise price of $10.23 per share and 771 options exercisable with a weighted average exercise price of $10.36 per share. Restricted Stock During the three months ended March 31, 2022, no shares of restricted stock were granted and 60 shares of restricted stock were forfeited. Additionally, during the three months ended March 31, 2022, 68 shares of restricted stock vested, of which no shares of common stock were surrendered to the Company as payment by employees in lieu of cash to satisfy minimum tax withholding obligations in connection with the vesting of restricted stock. As of March 31, 2022, there were 362 shares of restricted stock outstanding that were still subject to service-based vesting conditions. During the three months ended March 31, 2022, there were accelerated vesting term modifications of restricted stock as it related to the retirement of Mr. Kits van Heyningen, which resulted in an acceleration in compensation expense of approximately $186. During the three months ended March 31, 2022, there were accelerated vesting term modifications of restricted stock for employees terminated as part of the Company's restructuring, which resulted in an acceleration in compensation expense of approximately $57. As of March 31, 2022, the Company had no unvested outstanding options and no outstanding shares of restricted stock that were subject to performance-based or market-based vesting conditions. (b) Employee Stock Purchase Plan The Company's ESPP affords eligible employees the right to purchase common stock, via payroll deductions, through various offering periods at a purchase price equal to 85% of the fair market value of the common stock on the first or last day of the offering period, whichever is lower. During the three months ended March 31, 2022 and 2021, 22 and 0 shares were issued under the ESPP plan, respectively. The Company recorded compensation charges related to the ESPP of $22 and $8 for the three months ended March 31, 2022 and 2021, respectively. (c) Stock-Based Compensation Expense The following table presents stock-based compensation expense, including under the ESPP, in the Company's consolidated statements of operations for the three months ended March 31, 2022 and 2021:
| Three Months Ended March 31, |  |
| 2022 |  | 2021 |  |  |  |
Cost of product sales | $ | 74 |  |  | $ | 46 |  |  |  |  |
Cost of service sales | 2 |  |  | 2 |  |  |  |  |
Research and development | 141 |  |  | 156 |  |  |  |  |
Sales, marketing and support | 186 |  |  | 190 |  |  |  |  |
General and administrative | 478 |  |  | 538 |  |  |  |  |
| $ | 881 |  |  | $ | 932 |  |  |  |  |
(d) Accumulated Other Comprehensive Loss (AOCI) Comprehensive loss includes net loss and unrealized gains and losses from foreign currency translation. The components of the Company’s comprehensive loss and the effect on earnings for the periods presented are detailed in the accompanying consolidated statements of comprehensive loss. The balances for the three months ended March 31, 2022 and 2021 are as follows:
| Foreign Currency Translation |  | Total Accumulated Other Comprehensive Loss
Balance, December 31, 2021 | $ | (3,409) |  |  | $ | (3,409) |
Other comprehensive loss | (193) |  |  | (193) |
Net other comprehensive loss | (193) |  |  | (193) |
Balance, March 31, 2022 | $ | (3,602) |  |  | $ | (3,602) |
| Foreign Currency Translation |  |  |  |  |  | Total Accumulated Other Comprehensive Loss
Balance, December 31, 2020 | $ | (3,232) |  |  |  |  |  |  | $ | (3,232) |
Other comprehensive income | 223 |  |  |  |  |  |  | 223 |
Net other comprehensive income | 223 |  |  |  |  |  |  | 223 |
Balance, March 31, 2021 | $ | (3,009) |  |  |  |  |  |  | $ | (3,009) |

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