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Stock Option Plan (Tables) | 9 Months Ended
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Sep. 30, 2019
Share-based Payment Arrangement [Abstract] |
Schedule of Stock Option Activity | Activity under the Company's stock option plans is set forth below:
|  | Number of Options |  | Weighted- Average Exercise Price |  | Weighted- Average Remaining Contractual Term (Years) |  | Aggregate Intrinsic Value
Outstanding, December 31, 2018 |  | 661,180 |  |  | $ | 1.22 |  |  | 9.52 |  | $ | 6,198 |
Granted |  | 814,339 |  |  | $ | 13.99 |  |  |  |  |
Exercised |  | (50) |  |  | $ | 1.84 |  |  |  |  |
Forfeited |  | (310) |  |  | $ | 5.75 |  |  |  |  |
Expired |  | (153) |  |  | $ | 37.20 |  |  |  |  |
Outstanding, September 30, 2019 |  | 1,475,006 |  |  | $ | 8.26 |  |  | 8.89 |  | $ | 10,993 |
Vested and expected to vest, September 30, 2019 |  | 1,475,006 |  |  | $ | 8.26 |  |  | 8.89 |  | $ | 10,993 |
Options exercisable, September 30, 2019 |  | 20,464 |  |  | $ | 30.74 |  |  | 4.56 |  | $ | 23 |
Schedule of Fair Value Assumptions, Stock Options | The fair value of employee stock options was estimated using the following assumptions to determine the fair value of stock options granted:
|  | Three Months Ended September 30, |  |  |  | Nine Months Ended September 30, |  |
|  | 2019 |  | 2018 |  | 2019 |  | 2018
Expected volatility |  | 59% |  |  | 70% |  |  | 59% |  |  | 70% |
Risk-free interest rate |  | 2.0% |  |  | 2.6% |  |  | 2.0%-2.6% |  | 1.4% - 2.6%
Dividend yield |  | — |  |  | — |  |  | — |  |  | — |
Expected term (in years) |  | 5.75-6.08 |  | 6.08 |  | 5.75-6.08 |  | 6.08
Schedule of Non-cash Stock-based Compensation Expense | Total non-cash stock-based compensation expense recorded related to options granted in the condensed statement of operations is as follows (in thousands):
|  | Three Months Ended September 30, |  |  |  | Nine Months Ended September 30, |  |
|  | 2019 |  | 2018 |  | 2019 |  | 2018
Cost of revenue |  | $ | 4 |  |  | $ | 1 |  |  | $ | 6 |  |  | $ | 11 |
Selling, general and administrative |  | 55 |  |  | 9 |  |  | 73 |  |  | 83 |
Research and development |  | 3 |  |  | — |  |  | 6 |  |  | 6 |
Total |  | $ | 62 |  |  | $ | 10 |  |  | $ | 85 |  |  | $ | 100 |

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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 http://asc.fasb.org/extlink&oid=116856206&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 http://asc.fasb.org/extlink&oid=116856206&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 http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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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=116856206&loc=d3e5070-113901 + Details
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