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Common Stock | 12 Months Ended
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Dec. 31, 2021
Equity [Abstract] |
Common Stock | Common Stock We are authorized to issue 400 million shares of our common stock, with a par value per share of $0.001. As of December 31, 2021, we have reserved the following shares of our common stock for future issuance:
| December 31, 2021
Outstanding stock options | 381,756 |
Outstanding RSUs and PSUs | 8,171,462 |
Shares available for grant under the 2013 Plan | 30,629,068 |
Shares available for issuance under the 2013 ESPP | 9,814,172 |
Total common shares reserved for future issuance | 48,996,458 |
Stock Plans 2013 Equity Incentive Plan On June 6, 2013, the Board of Directors adopted our 2013 Equity Incentive Plan (the 2013 Plan), which was subsequently approved by our stockholders on August 29, 2013. The 2013 Plan became effective on November 11, 2013 and replaced the 2005 Plan. On the effective date of the 2013 Plan, 12,000,000 shares of our common stock were reserved for issuance, plus an additional 3,838,985 shares reserved but not issued or subject to outstanding awards under our 2005 Plan on the effective date of the 2013 Plan, plus, on and after the effective date of the 2013 Plan, (i) shares that are subject to outstanding awards under the 2005 Plan which cease to be subject to such awards, (ii) shares issued under the 2005 Plan that are forfeited or repurchased at their original issue price and (iii) shares subject to awards under the 2005 Plan that are used to pay the exercise price of an option or withheld to satisfy the tax withholding obligations related to any award. As of December 31, 2021, there were 30,629,068 shares available for grant under the 2013 Plan. The 2013 Plan permits the granting of incentive stock options, non-qualified stock options, RSUs, stock appreciation rights, restricted shares of common stock and performance share awards. The exercise price of stock options may not be less than the 100% of the fair market value of the common stock on the date of grant. Options granted pursuant to the 2013 Plan generally expire no later than 10 years. 2013 Employee Stock Purchase Plan On June 6, 2013, our Board of Directors adopted our 2013 Employee Stock Purchase Plan (the 2013 ESPP) and our stockholders subsequently approved the 2013 ESPP Plan on August 29, 2013. The 2013 ESPP permits eligible employees to acquire shares of our common stock by accumulating funds through periodic payroll deductions of up to 15% of base salary. Our 2013 ESPP is intended to qualify as an ESPP under Section 423 of the Code and employees will receive a 15% discount to the lesser of the fair market value of our common stock on (i) the first trading day of the applicable offering period or (ii) the last day of each purchase period in the applicable offering period. Each offering period may run for no more than six months. We have reserved 4,000,000 shares of our common stock under our 2013 ESPP. The aggregate number of shares issued over the term of our 2013 ESPP will not exceed 20,000,000 shares of our common stock. As of December 31, 2021, there were 9,814,172 shares of common stock available for future issuance under the 2013 ESPP.

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