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Stock-Based Compensation | 9 Months Ended
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Sep. 30, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Stock-Based Compensation | 13. Stock-Based Compensation Employee Stock Options Valuation The fair value of employee and director stock options was estimated at the date of grant using a Black-Scholes option valuation model with the weighted average assumptions below.
|  | Three Months Ended September 30 |  |  | Nine Months Ended September 30 |
|  | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |
Expected term (in years) |  |  | 6.1 |  |  |  | 6.1 |  |  |  | 6.1 |  |  |  | 6.1 |
Expected volatility |  |  | 46.9 | % |  |  | 60.0 | % |  |  | 52.1 | % |  |  | 60.0 | %
Risk-free interest rate |  |  | 1.94 | % |  |  | 1.28 | % |  |  | 2.07 | % |  |  | 1.45 | %
Dividend yield |  |  | 0.0 | % |  |  | 0.0 | % |  |  | 0.0 | % |  |  | 0.0 | %
Stock-Based Compensation The following table summarizes the total stock-based compensation expense included in the statements of operations and comprehensive loss for all periods presented (in thousands):
|  | Three Months Ended September 30 |  |  | Nine Months Ended September 30 |
|  | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |
Cost of revenue |  | $ | 36 |  |  | $ | 3 |  |  | $ | 112 |  |  | $ | 8 |
Research and development |  |  | 446 |  |  |  | 34 |  |  |  | 1,198 |  |  |  | 103 |
Selling, general and administrative |  |  | 2,249 |  |  |  | 364 |  |  |  | 5,714 |  |  |  | 1,140 |
Total stock-based compensation expense |  | $ | 2,731 |  |  | $ | 401 |  |  | $ | 7,024 |  |  | $ | 1,251 |
As September 30, 2017, there was total unamortized compensation costs of $10.1 million, net of estimated forfeitures, related to unvested stock options which the Company expects to recognize over a period of approximately 2.5 years, $12.4 million, net of estimated forfeitures, related to unrecognized restricted stock unit (“RSU”) expense, which the Company expects to recognize over a period of 2.7 years, and $0.4 million unrecognized ESPP expense, which the Company will recognize over 0.7 years. Non-Employee Stock-Based Compensation Stock-based compensation expense related to stock options granted to non-employees is recognized as the stock options are earned. The measurement of stock-based compensation for non-employees is subject to periodic adjustment as the underlying equity instruments vest, and the related compensation expense is based on the estimated fair value of the equity instruments using the Black-Scholes option pricing model. The Company believes that the estimated fair value of the stock options is more readily measurable than the fair value of the services received. Such expense was not material for the three and nine months ended September 30, 2017 and 2016.

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -URI http://asc.fasb.org/subtopic&trid=2208855 + Details
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