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STOCK-BASED COMPENSATION PLANS (Tables) | 12 Months Ended
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Dec. 31, 2019
STOCK-BASED COMPENSATION PLANS |
Fair Value of Stock Options Grants | The following assumptions were used in estimating the grant date fair value of stock options granted during the years ended December 31, 2019 and 2018:
|  | 2019 |  | 2018 |
Weighted average expected term |  | 6.25 years |  | 6.25 years |
Weighted average volatility |  | 122 | % | 123 | %
Weighted average risk-free interest rate |  | 2.30 | % | 3.00 | %
Dividend yield |  | 0 | % | 0 | %
Schedule of share based compensation expenses recorded in the consolidated statement of income | The following table summarizes stock-based compensation expenses recorded in the condensed consolidated statements of operations (in thousands):
|  | For the Years Ended December 31,
|  | 2019 |  | 2018
Costs of revenue - devices and supplies |  | $ | 21 |  | $ | 33
Sales and marketing expense |  |  | 205 |  |  | 127
General, and administrative |  |  | 594 |  |  | 210
Total stock based compensation expense |  | $ | 820 |  | $ | 370
Summary of Stock Option Activity Under the Option Plan |
|  |  |  |  |  |  | Weighted |  |  |
|  |  |  | Weighted |  | Average |  | Aggregate
|  |  |  | Average |  | Remaining |  | Intrinsic
|  | Number of Shares |  | Strike |  | Contractual |  | Value
|  | (in thousands) |  | Price |  | Life (Years) |  | (in thousands)
Outstanding at December 31, 2017 |  | 2,142 |  | $ | 0.56 |  |  |  |  |
Granted |  | 215 |  | $ | 2.99 |  |  |  |  |
Exercised |  | (357) |  | $ | 0.44 |  |  |  |  |
Forfeited |  | (115) |  | $ | 1.48 |  |  |  |  |
Outstanding at December 31, 2018 |  | 1,885 |  | $ | 0.80 |  | 6.32 |  | $ | 4,085
Outstanding at December 31, 2018 |  | 1,885 |  | $ | 0.80 |  |  |  |  |
Granted |  | 653 |  | $ | 5.81 |  |  |  |  |
Exercised |  | (503) |  | $ | 0.44 |  |  |  |  |
Expired |  | (6) |  | $ | 1.00 |  |  |  |  |
Forfeited |  | (174) |  | $ | 2.64 |  |  |  |  |
Outstanding at December 31, 2019 |  | 1,855 |  | $ | 2.48 |  | 6.42 |  | $ | 10,032
Exercisable at December 31, 2019 |  | 965 |  | $ | 0.60 |  | 4.15 |  | $ | 7,022
Summary of Stock Options Outstanding Under The Plans |
|  | Outstanding |  | Weighted average |  |  |  |  |  |  |  |  |  |
|  | Number of |  | Remaining |  |  |  |  |  |  |  |  | Weighted Average
|  | Options |  | Contractual |  | Weighted Average |  | Exercisable Number of |  | Remaining Exercisable |  | Exercisable
Range |  | (in thousands) |  | Life (years) |  | Strike Price |  | Options (in thousands) |  | Contractual Life (years) |  | Strike Price
$0 to $2.00 |  | 1,040 |  | 4.33 |  | $ | 0.42 |  | 889 |  | 3.80 |  | $ | 0.41
$2.01 to $4.00 |  | 367 |  | 8.68 |  | $ | 3.11 |  | 76 |  | 8.26 |  | $ | 2.78
$4.01 to $6.00 |  | 210 |  | 9.18 |  | $ | 5.35 |  | — |  | — |  | $ | —
$6.01 to $8.00 |  | 200 |  | 9.56 |  | $ | 7.87 |  | — |  | — |  | $ | —
$8.01 to $10.00 |  | 38 |  | 9.86 |  | $ | 8.96 |  | — |  | — |  | $ | —
|  | 1,855 |  | 6.42 |  | $ | 2.48 |  | 965 |  | 4.15 |  | $ | 0.60
Restricted Stock Award Activity Under all Equity Compensation Plans | A summary of our unvested stock options as of December 31, 2019 and 2018 and related activity is presented below:
|  | Non-vested |  |  |
|  | Shares |  | Weighted
|  | Under |  | Average
|  | Option |  | Grant Date
|  | (in thousands) |  | Fair Value
Non-vested at December 31, 2017 |  | 658 |  | $ | 0.81
Granted |  | 215 |  | $ | 2.65
Vested |  | (256) |  | $ | 0.72
Forfeited |  | (48) |  | $ | 1.98
Non-vested at December 31, 2018 |  | 569 |  | $ | 1.44
Non-vested at December 31, 2018 |  | 569 |  | $ | 1.44
Granted |  | 653 |  | $ | 5.12
Vested |  | (169) |  | $ | 1.24
Forfeited |  | (163) |  | $ | 2.44
Non-vested at December 31, 2019 |  | 890 |  | $ | 4.03
A summary of restricted stock award activity under the 2017 Stock Plan for the years ended December 2019 and 2018 are presented below:
|  | Number of Shares |  | Weighted Average
|  | (in thousands) |  | Grant Date Fair Value
Outstanding at December 31, 2017 |  | 15 |  | $ | 1.10
Granted |  | 80 |  | $ | 3.56
Vested |  | (19) |  | $ | 3.09
Outstanding at December 31, 2018 |  | 76 |  | $ | 3.19
Outstanding at December 31, 2018 |  | 76 |  | $ | 3.19
Granted |  | 55 |  | $ | 8.10
Vested |  | (29) |  | $ | 3.24
Outstanding at December 31, 2019 |  | 102 |  | $ | 5.81

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