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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2020
Share-based Payment Arrangement [Abstract] |
Schedule of Fair Value of Employee Stock Options Estimated Using Weighted Average Assumptions | The fair value of employee and director stock options was estimated at the date of grant using the Black-Scholes option pricing model with the weighted average assumptions below.
| Year Ended Year ended December 31,
| 2019 |  | 2018
Expected term (in years) | 6.1 |  | 6.1
Expected volatility | 45.0 | % |  | 45.7 | %
Risk-free interest rate | 2.39 | % |  | 2.75 | %
Dividend yield | — | % |  | — | %
The fair value of market based RSUs was estimated at the date of grant using the Monte-Carlo option pricing model with the assumptions below. Additional details on the Company's market based RSUs are included below.
| Year Ended December 31,
| 2020
Expected term (in years) | 0.74
Expected volatility | 63.0 | %
Risk-free interest rate | 0.17 | %
Dividend yield | — | %
Summary of Stock-Based Compensation Expense Included in Consolidated Statements of Operations and Comprehensive Loss | 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):
| Year Ended December 31
| 2020 |  | 2019 |  | 2018
Cost of revenue | $ | 27 |  |  | $ | 658 |  |  | $ | 193 |
Research and development | 7,727 |  |  | 4,462 |  |  | 3,057 |
Selling, general and administrative | 33,761 |  |  | 21,121 |  |  | 13,079 |
Total stock-based compensation expense | $ | 41,515 |  |  | $ | 26,241 |  |  | $ | 16,329 |

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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 + 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=120381028&loc=d3e5070-113901 + Details
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