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v3.21.4

Stockholders' Equity (Tables) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Stockholders' Equity (Deficit) |  |
Schedule of fair value of stock option awards valuation assumptions |  | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2020 |  | 2019 |  | 2018
Exercise price | ​ | $2.29 – $2.55 | ​ | $2.54 – $2.55 | ​ | $2.96 – $3.07
Expected dividend yield | ​ | 0% | ​ | 0% | ​ | 0%
Expected volatility | ​ | 41% – 46% | ​ | 38% – 39% | ​ | 37% – 39%
Expected term (years) | ​ | 5.55 – 6.07 | ​ | 5.80 – 6.09 | ​ | 5.65 – 6.25
Risk free interest rate | ​ | 0.26% – 1.17% | ​ | 1.58% – 2.35% | ​ | 2.47% – 3.04%
Schedule of stock options activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted | ​ | Weighted | ​ | ​ |
​ | ​ | ​ | ​ | Average | ​ | Average | ​ | Aggregate
​ | ​ | Number of | ​ | Exercise | ​ | Remaining | ​ | Intrinsic
​ |  | Shares |  | Price |  | Term |  | Value
Balance as of December 31, 2020 |  | 32,127 |  | $ | 1.96 |  | 5.01 |  | $ | 19,248
Granted |  | 2,028 | ​ | ​ | 2.79 |  |  | ​ | ​ | ​
Exercised |  | (798) | ​ | ​ | 0.73 |  |  | ​ | ​ | ​
Forfeited |  | (7,738) | ​ | ​ | 2.97 |  |  | ​ | ​ | ​
Expired |  | (1,603) | ​ | ​ | 2.78 |  |  | ​ | ​ | ​
Balance as of September 30, 2021 |  | 24,016 |  | $ | 1.69 |  | 2.59 |  | $ | 25,699
Expected to vest at September 30, 2021 |  | 2,357 |  | $ | 2.74 |  | 9.35 | ​ | ​ | —
Exercisable at September 30, 2021 |  | 24,016 |  | $ | 1.69 |  | 2.59 |  | $ | 25,699
| ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted | ​ | Weighted | ​ | ​ | ​
​ | ​ | ​ | ​ | Average | ​ | Average | ​ | Aggregate
​ | ​ | Number of | ​ | Exercise | ​ | Remaining | ​ | Intrinsic
​ |  | Shares |  | Price |  | Term |  | Value
Balance as of December 31, 2019 |  | 35,016 | ​ | $ | 2.00 |  | 5.03 | ​ | $ | 24,634
Granted |  | 335 | ​ |  | 2.46 | ​ | — | ​ | ​ | —
Exercised |  | (230) | ​ |  | 0.62 | ​ | — | ​ | ​ | —
Forfeited |  | (1,700) | ​ |  | 2.86 | ​ | — | ​ | ​ | —
Expired |  | (1,294) | ​ |  | 2.22 | ​ | — | ​ | ​ | —
Balance as of December 31, 2020 |  | 32,127 | ​ | $ | 1.96 |  | 5.01 | ​ | $ | 19,248
Expected to vest at December 31, 2020 |  | 8,427 | ​ | $ | 2.94 |  | 7.98 | ​ |  | —
Exercisable at December 31, 2020 |  | 24,611 | ​ | $ | 1.65 |  | 4.12 | ​ | $ | 19,248
Schedule of the restricted stock unit activity | ​
​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ | Weighted Average
​ | ​ | ​ | ​ | Grant-Date Fair
​ |  | Shares |  | Value
Outstanding as of December 31, 2020 |  | 8,268 |  | $ | 2.61
Granted |  | 9,260 | ​ | ​ | 2.81
Vested |  | — | ​ | ​ | —
Forfeited |  | (359) | ​ | ​ | 2.70
Outstanding as of September 30, 2021 |  | 17,169 |  | $ | 2.71
| A summary of the restricted stock unit activity is presented below (in thousands, except per share amounts):
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted Average
​ | ​ | ​ | ​ | Grant-Date Fair
​ |  | Shares |  | Value
Outstanding as of December 31, 2019 |  | 8,433 | ​ | $ | 2.63
Granted |  | 1,003 | ​ |  | 2.38
Vested |  | — | ​ |  | —
Forfeited |  | (1,168) | ​ |  | 2.67
Outstanding as of December 31, 2020 |  | 8,268 | ​ | $ | 2.61

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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