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Stock-Based Incentive Compensation Plans (Tables) | 6 Months Ended
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Jun. 30, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Stock Option Activity Under Stock Option Plan | The table below summarizes the stock option activity for the six months ended June 30, 2019:
|  | Number of Shares |  | Weighted- Average Exercise Price
Outstanding as of December 31, 2018 |  | 2,641,198 |  |  | $4.27
Options granted |  | 630,639 |  |  | 20.91
Options exercised |  | (184,130 | ) |  | 3.10
Options canceled |  | (62,964 | ) |  | 6.61
Outstanding as of June 30, 2019 |  | 3,024,743 |  |  | 7.76
Schedule of Valuation Assumptions Related to Stock Option Awards | The Company estimated the fair value of ESPP purchase rights during the offer period using a Black-Scholes option pricing model with the following assumptions:
|  | Three and Six Months Ended
|  | June 30, 2019
Expected term |  | 0.5 years
Expected volatility |  | 58.35%
Risk-free interest rate |  | 2.49%
Dividend yield |  | —%
The table below summarizes the weighted average grant date fair value per share and the assumptions used to estimate the grant date fair value of the stock options granted during the respective periods using the Black-Scholes option-pricing model:
| Three Months Ended |  | Six Months Ended
| June 30, |  | June 30,
| 2019 |  | 2018 |  | 2019 |  | 2018
Weighted average grant date fair value per share | $8.00 |  | $2.11 |  | $9.79 |  | $2.09
Expected term | 5.0 to 7.0 years |  | 5.0 to 7.0 years |  | 5.0 to 7.0 years |  | 5.0 to 7.0 years
Expected volatility | 46.6% to 47.2% |  | 42.0% to 44.4% |  | 41.7% to 47.2% |  | 42.0% to 45.1%
Risk-free interest rate | 1.83% to 2.41% |  | 2.83% to 2.93% |  | 1.83% to 2.59% |  | 2.35% to 2.93%
Dividend yield | —% |  | —% |  | —% |  | —%
Schedule of Restricted Stock Unit Activity | The table below summarizes restricted stock units activity for the six months ended June 30, 2019:
|  | Number of Shares |  | Weighted Average Grant Date Fair Value
Outstanding as of December 31, 2018 |  | 53,436 |  |  | $11.69
Granted |  | 548,906 |  |  | 20.49
Forfeited |  | (10,384) |  |  | 19.84
Vested |  | (27,320 | ) |  | 20.97
Outstanding as of June 30, 2019 |  | 564,638 |  |  | 19.65
Schedule of Stock-Based Compensation | The table below presents the detail of stock-based compensation expense amounts included in the consolidated statements of operations (in thousands):
|  | Three Months Ended June 30, |  | Six Months Ended June 30,
|  | 2019 |  | 2018 |  | 2019 |  | 2018
Cost of goods sold |  | $ | 63 |  |  | $ | 6 |  |  | $ | 106 |  |  | $ | 12 |
Sales and marketing |  | 940 |  |  | 113 |  |  | 1,674 |  |  | 240 |
Research and development |  | 124 |  |  | 31 |  |  | 220 |  |  | 70 |
General and administrative |  | 687 |  |  | 213 |  |  | 1,685 |  |  | 432 |
|  | $ | 1,814 |  |  | $ | 363 |  |  | $ | 3,685 |  |  | $ | 754 |

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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 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 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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