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Stockholders’ Equity (Tables) | 6 Months Ended
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Jun. 30, 2022
Equity [Abstract] |
Equity Based Compensation Expense | Stock-based compensation expense, consisting of service-based expense related to the equity incentive plan, including expense from stock options and restricted stock units, and the employee stock purchase plan was classified as follows in the accompanying condensed consolidated statements of operations for each of the periods presented (in thousands):
| Three Months Ended June 30 |  | Six Months Ended June 30,
| 2022 |  | 2021 |  | 2022 |  | 2021
Cost of revenue | $ | 176 |  |  | $ | 210 |  |  | $ | 324 |  |  | $ | 279 |
Sales and marketing | 790 |  |  | 679 |  |  | 1,452 |  |  | 811 |
Research and development | 1,078 |  |  | 2,020 |  |  | 1,630 |  |  | 2,416 |
General and administrative | 2,436 |  |  | 2,360 |  |  | 4,499 |  |  | 3,587 |
Total | $ | 4,480 |  |  | $ | 5,269 |  |  | $ | 7,905 |  |  | $ | 7,093 |
Schedule of Stock Option Activity | Stock option activity was as follows:
| Number of Options |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Life (years) |  | Aggregate Intrinsic Value (in thousands)
Outstanding as of December 31, 2021 | 7,574,136 |  |  | $ | 8.60 |  |  | 8.35 |  | $ | 52,257 |
Exercisable as of December 31, 2021 | 2,719,252 |  |  | $ | 3.44 |  |  | 7.03 |  | $ | 31,929 |
Granted | — |  |  | — |  |  |  |  |
Exercised | (564,083) |  |  | $ | 1.65 |  |  |  |  |
Forfeited and expired | (380,947) |  |  | $ | 12.07 |  |  |  |  |
Outstanding as of March 31, 2022 | 6,629,106 |  |  | $ | 8.99 |  |  | 7.81 |  | $ | 8,815 |
Exercisable as of March 31, 2022 | 2,665,039 |  |  | $ | 5.45 |  |  | 6.30 |  | $ | 6,975 |
Granted | — |  |  | $ | — |  |  |  |  |
Exercised | (121,241) |  |  | $ | 1.55 |  |  |  |  |
Forfeited and expired | (649,298) |  |  | $ | 14.15 |  |  |  |  |
Outstanding as of June 30, 2022 | 5,858,567 |  |  | $ | 8.58 |  |  | 6.86 |  | $ | 2,402 |
Exercisable as of June 30, 2022 | 2,959,753 |  |  | $ | 6.35 |  |  | 5.45 |  | $ | 2,281 |
Schedule of Restricted Stock Unit Activity | Restricted Stock Unit activity was as follows:
| Number of Shares |  | Weighted Average Grant Date Fair Value
Outstanding as of December 31, 2021 | 171,075 |  |  | $ | 18.50 |
Granted | 3,183,398 |  |  | 6.24
Vested | (593) |  |  | 9.08
Canceled | (33,911) |  |  | 16.02
Outstanding as of March 31, 2022 | 3,319,969 |  |  | $ | 6.77 |
Granted | 2,420,126 |  |  | $ | 5.48 |
Vested | (174) |  |  | $ | 5.13 |
Canceled | (440,535) |  |  | $ | 7.29 |
Outstanding as of June 30, 2022 | 5,299,386 |  |  | $ | 6.11 |

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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