Share-based Compensation (Tables)
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9 Months Ended |
Sep. 30, 2018 |
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| Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
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| Schedule of Share-based Compensation Expense |
During the periods presented, the Company recorded the following share-based compensation expense for stock options and restricted stock awards: | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Three Months Ended September 30, | | Nine Months Ended September 30, | | | 2018 | | 2017 | | 2018 | | 2017 | | | | | | | | | | | | (in thousands) | Sales, general and administrative | | $ | 1,409 |
| | $ | 230 |
| | $ | 1,995 |
| | $ | 865 |
| Research and development | | 1,345 |
| | 338 |
| | 2,971 |
| | 1,525 |
| Total | | $ | 2,754 |
| | $ | 568 |
| | $ | 4,966 |
| | $ | 2,390 |
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| Schedule of Stock Options |
Stock Options | | | | | | | | | | | | | | | | | | | | | | | | | | Number of Options Outstanding | | Weighted-Average Exercise Price | | Weighted-Average Remaining Contractual Term (in years) | | Aggregate Intrinsic Value (in thousands) | Balances at December 31, 2017 | | 863,932 |
| | $ | 5.36 |
| | 7.6 | | $ | 4,199 |
| Granted (weighted-average fair value of $10.27 per share) | | 778,628 |
| | 16.15 |
| | | | | Exercised | | (125,596 | ) | | 4.91 |
| | | | | Forfeited/canceled | | (56,101 | ) | | 7.54 |
| | | | | Balances at September 30, 2018 | | 1,460,863 |
| | $ | 11.09 |
| | 8.96 | | $ | 19,247 |
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| Schedule of Employee Stock Options Valuation Assumptions |
The fair value of stock options granted to employees in 2018 was estimated using the following assumptions: | | | | | | | | | Nine Months Ended September 30, | | | 2018 | Volatility | | 56.0% - 57.0% | Risk-free interest rate | | 2.7% - 2.9% | Term (in years) | | 6.25 | Dividend yield | | 0% | | | |
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| Schedule of Non-employee Stock Options Valuation Assumptions |
The fair value of stock options granted to consultants was estimated using the following assumptions during the following periods presented: | | | | | | | | | | | | | Nine Months Ended September 30, | | | 2018 | | 2017 | Volatility | | 58.0% - 59.0% | | 43.0% | Risk-free interest rate | | 2.8% - 3.1% | | 2.3% | Term (in years) | | 10.0 | | 9.5 - 9.8 | Dividend yield | | 0.0% | | 0.0% | | | | | |
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| Schedule of Restricted Stock |
The following table represents RSA activity for fiscal 2018: | | | | | | | | | | | | | | | | Restricted Stock Awards | | Weighted- Average Grant Date Fair Value | Outstanding unvested at December 31, 2017 | | 585,056 |
| | $ | 7.57 |
| Granted | | 90,301 |
| | 13.27 |
| Vested | | (163,871 | ) | | 7.00 |
| Forfeited/canceled | | (116,502 | ) | | 9.60 |
| Outstanding unvested at September 30, 2018 | | 394,984 |
| | $ | 8.51 |
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The following table represents RSU activity for fiscal 2018: | | | | | | | | | | | | | | | | Restricted Stock Units | | Weighted- Average Grant Date Fair Value | Outstanding unvested at December 31, 2017 | | — |
| | $ | — |
| Granted | | 3,852 |
| | 25.35 |
| Vested | | (3,852 | ) | | 25.35 |
| Forfeited/canceled | | — |
| | — |
| Outstanding unvested at September 30, 2018 | | — |
| | $ | — |
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