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STOCK-BASED COMPENSATION PLANS (Tables) | 9 Months Ended
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Sep. 30, 2020
Share-based Payment Arrangement [Abstract] |
Schedule of activity related to outstanding stock options | The activity related to the Company's outstanding stock options for the nine months ended September 30, 2020 was as follows:
| Number of Shares |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Term (years) |  | Aggregate Intrinsic Value (in thousands)
Outstanding at January 1, 2020 | 297,124 |  |  | $ | 11.55 |  |  |  |  |
Granted | — |  |  | $ | — |  |  |  |  |
Exercised | (16,128) |  |  | $ | 1.77 |  |  |  |  |
Forfeited | (6,055) |  |  | $ | 2.78 |  |  |  |  |
Expired | (41,717) |  |  | $ | 15.78 |  |  |  |  |
Outstanding at September 30, 2020 | 233,224 |  |  | $ | 11.70 |  |  | 4.10 |  | $ | 157 |
Vested or expected to vest at September 30, 2020 | 232,800 |  |  | $ | 11.71 |  |  | 4.10 |  | $ | 157 |
Exercisable at September 30, 2020 | 224,173 |  |  | $ | 12.09 |  |  | 4.00 |  | $ | 140 |
Schedule of stock options, additional information | Additional information regarding the Company's stock options for the nine months ended September 30, 2020 was as follows (in thousands):
| Three months ended |  | Nine months ended
| September 30, 2020 |  | September 30, 2020
Total intrinsic value of stock options exercised | $ | 7 |  |  | $ | 36 |
Cash received from the exercise of stock options | $ | 6 |  |  | $ | 29 |
Schedule of activity related to unvested restricted stock grants | The activity related to the Company's RSAs for the nine months ended September 30, 2020 was as follows:
| Shares |  | Weighted Average Grant Date Fair Value
Unvested balance at January 1, 2020 | 487,976 |  |  | $ | 6.87 |
Granted | — |  |  | $ | — |
Vested | (304,441) |  |  | $ | 6.80 |
Forfeited | (27,484) |  |  | $ | 6.97 |
Unvested balance at September 30, 2020 | 156,051 |  |  | $ | 7.00 |
The activity related to the Company's RSUs for the nine months ended September 30, 2020 was as follows:
| Shares |  | Weighted Average Grant Date Fair Value
Unvested balance at January 1, 2020 | 2,790,060 |  |  | $ | 5.11 |
Granted | 6,486,016 |  |  | $ | 2.93 |
Vested | (1,667,289) |  |  | $ | 4.75 |
Forfeited | (677,124) |  |  | $ | 3.69 |
Unvested balance at September 30, 2020 | 6,931,663 |  |  | $ | 3.30 |
Schedule of activity related to performance stock awards | The activity related to the Company's PSUs for the nine months ended September 30, 2020 was as follows:
| Shares |  | Weighted Average Grant Date Fair Value
Unvested balance at January 1, 2020 | 1,067,073 |  |  | $ | 5.94 |
Granted | 5,804,202 |  |  | $ | 1.44 |
Vested | (323,752) |  |  | $ | 5.52 |
Forfeited | (377,753) |  |  | $ | 5.22 |
Unvested balance at September 30, 2020 | 6,169,770 |  |  | $ | 1.67 |
Schedule of stock-based compensation expenses which are included in condensed consolidated statement of operations | The condensed consolidated statements of operations include stock-based compensation for the three and nine months ended September 30, 2020 and 2019 as follows (in thousands):
| Three months ended |  | Nine months ended
| September 30, 2020 |  | September 30, 2019 |  | September 30, 2020 |  | September 30, 2019
Product cost of revenue | $ | 57 |  |  | $ | 26 |  |  | $ | 123 |  |  | $ | 62 |
Service cost of revenue | 204 |  |  | 124 |  |  | 493 |  |  | 367 |
Research and development | 868 |  |  | 521 |  |  | 2,164 |  |  | 1,359 |
Sales and marketing | 1,189 |  |  | 721 |  |  | 2,952 |  |  | 2,265 |
General and administrative | 1,651 |  |  | 1,093 |  |  | 4,435 |  |  | 4,101 |
| $ | 3,969 |  |  | $ | 2,485 |  |  | $ | 10,167 |  |  | $ | 8,154 |

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