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Equity Compensation Plans
 6 Months Ended
Jun. 30, 2022
Share-Based Payment Arrangement [Abstract]  
Equity Compensation Plans EQUITY COMPENSATION PLANS
The Company has two share-based incentive plans: the 2014 Stock Incentive Plan (2014 Plan) and the 2019 Employee Stock Purchase Plan (ESPP).
Stock Incentive Plan
Under the 2014 Plan, the Board of Directors may grant incentive stock options to Company employees and may grant restricted stock awards, restricted stock units, nonstatutory stock options, performance share awards and stock appreciation rights to Company employees, directors and consultants. The Compensation Committee of the Board of Directors, as the administrator of the 2014 Plan, has the authority to determine the terms of any awards, including the number of shares subject to each award, the exercisability of the awards and the form of consideration. As of June 30, 2022, 12,899 shares of common stock had been reserved for issuance under the 2014 Plan, and 1,076 shares were available for future grants. At the Company's 2022 Annual Meeting of Stockholders, stockholders approved an amendment to the 2014 Plan increasing the shares authorized under the 2014 Plan by 1,100.
Employee Stock Purchase Plan
Under the ESPP, shares of the Company’s common stock may be purchased at a discount (15%) of the lesser of the closing price of the Company’s common stock on the first or last trading days of the offering period. The offering period (currently six months) and the offering price are subject to change. Participants may not purchase more than $25 of the Company’s common stock in a calendar year or more than 3 shares during an offering period. As of June 30, 2022, there were 228 shares available for future issuance under the ESPP.
Share-Based Compensation Expense Information
The following table summarizes the allocation of share-based compensation expense:
Three Months Ended
June 30,		Six Months Ended
June 30,
2022202120222021
Cost of revenue $487 $598 $1,058 $1,017 
Research and development expenses 1,186 1,083 2,316 2,020 
Selling, general and administrative expenses 5,851 5,460 11,199 10,708 
Total $7,524 $7,141 $14,573 $13,745