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Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2022
Share-Based Payment Arrangement [Abstract] |
Schedule of non-cash stock-based compensation expense | Non-cash stock-based compensation expenses related to stock options, restricted stock grants and the ESPP were recorded in the financial statements as follows (in thousands):
| Three Months Ended June 30, | Six Months Ended June 30,
| 2022 |  | 2021 | 2022 |  | 2021
Cost of sales | $ | 1 |  |  | $ | — |  | $ | 1 |  |  | $ | 1 |
Sales and marketing | 652 |  |  | 236 |  | 735 |  |  | 425 |
Research and development | 268 |  |  | 241 |  | 529 |  |  | 434 |
General and administrative | 767 |  |  | 802 |  | 1,488 |  |  | 1,435 |
Total non-cash stock compensation expense | $ | 1,688 |  |  | $ | 1,279 |  | $ | 2,753 |  |  | $ | 2,295 |
Summary of outstanding stock options | A summary of the Company’s stock options outstanding and related information under the 2015 OEIP and 2005 Plan for the six months ended June 30, 2022 are as follows (in thousands except weighted average exercise price and weighted average remaining contractual life):
| Shares |  | Weighted Avg. Exercise Price |  | Wtd. Avg. Remaining Contractual Life (Yrs) |  | Aggregate Intrinsic Value
Outstanding as of December 31, 2021 | 194 |  |  | $ | 4.12 |  |  |  |  | $ | — |
Granted | — |  |  | $ | — |  |  |  |  | $ | — |
Exercised | (8) |  |  | $ | 2.15 |  |  |  |  | $ | 11 |
Forfeited | (1) |  |  | $ | 5.52 |  |  |  |  | $ | — |
Expired | (5) |  |  | $ | 6.80 |  |  |  |  | $ | — |
Outstanding as of June 30, 2022 | 180 |  |  | $ | 4.12 |  |  | 4.5 |  | $ | 21 |
Vested and expected to vest at June 30, 2022 | 176 |  |  | $ | 4.10 |  |  | 4.3 |  | $ | 21 |
Exercisable as of June 30, 2022 | 145 |  |  | $ | 4.03 |  |  | 3.7 |  | $ | 17 |
Summary of restricted stock awards outstanding | A summary of the Company’s restricted stock awards outstanding under the 2015 OEIP and 2005 Plan for the six months ended June 30, 2022 are as follows (in thousands, except weighted average grant date fair value):
| Shares |  | Weighted average grant date fair value
Unvested at December 31, 2021 | 1,668 |  |  | $ | 5.83 |
Granted | 1,340 |  |  | $ | 3.82 |
Vested | (760) |  |  | $ | 5.00 |
Canceled and forfeited | (208) |  |  | $ | 6.08 |
Unvested at June 30, 2022 | 2,040 |  |  | $ | 4.80 |

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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + 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 (h)(1) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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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 https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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 (d) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 3: 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 https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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