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Stockholders' Equity | 6 Months Ended
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Jun. 30, 2021
Share-based Payment Arrangement [Abstract] |
Stockholders' Equity | Common Stock As of June 30, 2021, there were 200,000,000 shares of common stock authorized, 72,017,145 shares issued, and 69,307,315 shares outstanding. As of December 31, 2020, there were 200,000,000 shares of common stock authorized, 70,264,265 shares issued and 67,554,435 shares outstanding. The par value for shares of common stock is $0.001 per share. Preferred Stock As of June 30, 2021 and December 31, 2020, there were 5,000,000 shares of preferred stock authorized, and no shares were issued or outstanding. The par value for shares of preferred stock is $0.001 per share. Stock-Based Compensation Stock Option Plans The Company’s 2019 Stock Incentive Plan, as amended and restated (the “2019 Plan”), became effective on April 11, 2019. The 2019 Plan allows the Company to grant incentive stock options and restricted stock units to its employees and directors to participate in the Company’s future performance through stock-based awards at the discretion of the board of directors. On April 19, 2021, the Company’s board of directors amended the plan and authorized 5,000,000 new shares for issuance. The number of shares authorized for issuance is 40,067,744 shares in the aggregate. Options to acquire common stock granted thereunder have ten-year terms. As of June 30, 2021, approximately 6.0 million shares of common stock remained available for issuance (taking into account all option exercises and other equity award settlements through June 30, 2021). Employee Stock Purchase Plan There are 2,000,000 shares authorized and reserved for issuance under the 2019 Employee Stock Purchase Plan. As of June 30, 2021, approximately 0.8 million shares of common stock remain available for issuance under the 2019 Employee Stock Purchase Plan (taking into account all share purchases through June 30, 2021). Inducement Plan There are 3,368,048 shares of common stock authorized and reserved for issuance under the Inducement Plan. As of June 30, 2021, approximately 1.2 million shares of common stock remained available for issuance under the Inducement Plan (taking into account all option exercises and other equity award settlements through June 30, 2021). Stock Option Activity A summary of the Company’s stock option activity and weighted average exercise prices follows:
| Stock Option Activity |  | Weighted Average Remaining Contractual Term (In years) |  | Aggregate Intrinsic Value (In thousands)
| Options (In thousands) |  | Weighted Average Exercise Price |  |
Balances outstanding at December 31, 2020 | 4,332 |  |  | $ | 19.78 |  |  | 6.79 |  | $ | 183,825 |
Granted | 472 |  |  |  |  |  |  |
Exercised | (461) |  |  |  |  |  |  |
Cancelled or expired | (88) |  |  |  |  |  |  |
Balances outstanding at June 30, 2021 | 4,255 |  |  | 24.21 |  |  | 6.85 |  | 166,339 |
Options vested and expected to vest | 1,187 |  |  | 32.09 |  |  | 8.25 |  | 37,185 |
Options exercisable at June 30, 2021 | 2,448 |  |  | $ | 16.58 |  |  | 5.66 |  | $ | 114,235 |
The total fair value of stock options exercised during the six months ended June 30, 2021 was approximately $3.0 million. As of June 30, 2021, there was approximately $24.4 million of total unrecognized compensation cost related to nonvested share-based compensation arrangements. That cost is expected to be recognized over a weighted average period of approximately 2.9 years. Restricted Stock Unit Activity A summary of the Company’s restricted stock unit (“RSU”) activity and weighted average exercise prices follows:
| Restricted Stock Unit Activity |  |
| Number of Shares (In thousands) |  | Weighted Average Grant Date Fair Value (Per share) |  | Aggregate Fair Value (In thousands)
Balances outstanding at December 31, 2020 | 2,950 |  |  | $ | 27.00 |  |  | $ | 183,781 |
Awarded | 1,565 |  |  |  |  |
Vested | (1,244) |  |  |  |  |
Forfeited | (250) |  |  |  |  |
Non-vested and outstanding at June 30, 2021 | 3,021 |  |  | $ | 38.46 |  |  | $ | 191,205 |
Expected to vest | 1,841 |  |  | $ | 36.30 |  |  | $ | 116,404 |
RSUs granted to employees generally vest over a three to four-year period or upon achievement of certain performance conditions. As of June 30, 2021, total unrecognized compensation cost, adjusted for estimated forfeitures, related to nonvested RSUs was approximately $106.2 million and the weighted-average remaining vesting period was 3.2 years. For the three months ended June 30, 2021 and 2020, the Company accrued approximately $5.1 million and $7.9 million in cash rewards, respectively, and for the six months ended June 30, 2021 and 2020, the Company accrued approximately $10.4 million and $11.6 million in cash awards, respectively, to be settled in shares of the Company’s stock and recorded a corresponding expense, which is included as a component of stock-based compensation expense in the accompanying condensed consolidated statements of operations for the three and six months ended June 30, 2021 and 2020, respectively. Stock-based compensation expense recognized in the Company’s condensed consolidated statements of operations and cash flows was $15.1 million and $15.9 million for the three months ended June 30, 2021 and 2020, respectively, and $29.7 million and $30.6 million for the six months ended June 30, 2021 and 2020, respectively. The per share weighted average fair value of stock options granted was $24.76 and $12.36 during the three months ended June 30, 2021 and 2020, respectively. The per share weighted average fair value of stock options granted was $25.71 and $12.25 during the six months ended June 30, 2021 and 2020, respectively. The fair value of each option grant is estimated on the date of grant, adjusted for estimated forfeitures, using the Black-Scholes option-pricing model with the following weighted average assumptions:
| Three Months Ended |  | Six Months Ended
| June 30, |  | June 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Dividend yield | 0.00% |  | 0.00% |  | 0.00% |  | 0.00%
Risk-free interest rate | 0.77% -0.84% |  | 0.31% - 0.32% |  | 0.46% - 0.84% |  | 0.31% - 0.66%
Expected life (in years) | 5 |  | 5 |  | 5 |  | 5
Historical volatility | 54.31% - 54.55% |  | 51.91% - 51.94% |  | 53.94% - 54.55% |  | 46.50% - 51.94%
A description of the methods used in the significant assumptions used to estimate the fair value of stock-based compensation awards follows: •Dividend yield – The Company uses 0% as it has never issued dividends and does not anticipate issuing dividends in the near term. •Risk-free interest rate – The Company uses the market yield on U.S. Treasury securities at five years with constant maturity, representing the current expected life of stock options in years. •Expected life – The Company uses historical data to estimate the expected life of a stock option. •Historical volatility – The Company uses a trailing five year from grant date to determine volatility..

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- Definition The entire disclosure for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 + Details
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