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Stock Option Plan (Tables) | 9 Months Ended
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Sep. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Activity Under Stock Option Plan | The following table summarizes activity under the Plan for the nine months ended September 30, 2018:
|  | Options Outstanding |  |  |  |
|  | Shares Available for Grant |  | Number of Shares |  | Weighted- Average Exercise Price |  | Weighted- Average Remaining Contractual Life |  | Aggregate Intrinsic Value
|  |  |  |  |  |  |  | (in years) |  | (in thousands)
Balances at December 31, 2017 |  | 29,654 |  |  | 3,001,929 |  |  | $ | 4.15 |  |  |  |  | $ | 3,585 |
Options granted |  | (73,783 | ) |  | 73,783 |  |  | 5.51 |  |  |  |  |
Options exercised |  | — |  |  | (309,767 | ) |  | 4.11 |  |  |  |  | 960 |
Options cancelled |  | 54,278 |  |  | (54,278 | ) |  | 4.77 |  |  |  |  |
Balances at September 30, 2018 |  | 10,149 |  |  | 2,711,667 |  |  | $ | 4.12 |  |  | 6.8 |  | $ | 23,957 |
Options vested and exercisable - September 30, 2018 |  |  |  | 1,639,606 |  |  | $ | 3.65 |  |  | 6.0 |  | $ | 15,271 |
Options vested and expected to vest - September 30, 2018 |  |  |  | 2,489,664 |  |  | $ | 4.01 |  |  | 6.7 |  | $ | 22,285 |
Schedule of Stock-Based Compensation | The following table sets forth stock-based compensation expense related to options granted for the periods presented (in thousands):
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
|  | 2018 |  | 2017 |  | 2018 |  | 2017
Cost of goods sold |  | $ | 5 |  |  | $ | 5 |  |  | $ | 17 |  |  | $ | 18 |
Research and development |  | 30 |  |  | 33 |  |  | 101 |  |  | 98 |
Sales and marketing |  | 110 |  |  | 107 |  |  | 350 |  |  | 313 |
General and administrative |  | 183 |  |  | 198 |  |  | 613 |  |  | 609 |
|  | $ | 328 |  |  | $ | 343 |  |  | $ | 1,081 |  |  | $ | 1,038 |
Schedule of Valuation Assumptions Related to Stock Option Awards | The grant date fair value of the stock option awards granted to employees was estimated at the date of grant using a Black-Scholes option-pricing model with the following assumptions:
| Three months ended |  | Nine months ended
| September 30, |  | September 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Expected term | 6.04 |  | 6.03 |  | 5.98 |  | 5.05
Expected volatility | 41%-44% |  | 42%-46% |  | 41%-46% |  | 41%-55%
Risk-free interest rate | 2.74%-2.80% |  | 1.73%-2.15% |  | 2.35%-2.93% |  | 1.73%-2.75%
Dividend yield | —% |  | —% |  | —% |  | —%

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- Definition Tabular disclosure for share-based compensation 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 (e) -URI http://asc.fasb.org/extlink&oid=109197908&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 (c)(2) -URI http://asc.fasb.org/extlink&oid=109197908&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 (d) -URI http://asc.fasb.org/extlink&oid=109197908&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 http://asc.fasb.org/extlink&oid=109197908&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=109197908&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=109197908&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=109197908&loc=d3e5070-113901 + Details
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