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Stock Incentive Plans (Tables) | 3 Months Ended
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Mar. 31, 2021
Share-based Payment Arrangement [Abstract] |
Summary of Option, Unvested RSU Activity under 2014 Equity Incentive Plan and 2016 Inducement Equity Incentive Plan and Related Information | The following table summarizes option and RSU activity under the Company’s 2014 Equity Incentive Plan, 2016 Inducement Equity Incentive Plan, and 2019 Inducement Equity Incentive Plan, and related information:
| Shares Available for Grant |  | Stock Options Outstanding |  | Weighted- Average Exercise Price |  | Number of RSU Shares |  | Weighted- Average Grant Date Fair Value
Balance—December 31, 2020 | 672,968 |  |  | 2,670,398 |  |  | $ | 21.92 |  |  | 1,884,866 |  |  | $ | 28.42 |
Additional shares authorized | 1,977,647 |  |  | — |  |  | — |  |  | — |  |  | — |
Common stock awards for services | (1,339) |  |  | — |  |  | — |  |  | — |  |  | — |
RSUs granted | (246,379) |  |  | — |  |  | — |  |  | 246,379 |  |  | 82.62 |
RSUs vested | — |  |  | — |  |  | — |  |  | (207,881) |  |  | 24.06 |
Options granted | (127,925) |  |  | 127,925 |  |  | 81.06 |  |  | — |  |  | — |
Options exercised | — |  |  | (139,579) |  |  | 13.99 |  |  | — |  |  | — |
Repurchase of common stock under employee incentive plans | 74,434 |  |  | — |  |  | — |  |  | — |  |  | — |
RSUs forfeited | 69,945 |  |  | — |  |  | — |  |  | (69,945) |  |  | 29.32 |
Options forfeited | 66,213 |  |  | (66,213) |  |  | 25.70 |  |  | — |  |  | — |
Options expired | 250 |  |  | (250) |  |  | 22.59 |  |  | — |  |  | — |
Balance—March 31, 2021 | 2,485,814 |  |  | 2,592,281 |  |  | $ | 25.17 |  |  | 1,853,419 |  |  | $ | 36.14 |
Summary of Options Outstanding and Exercisable Vested or Expected to Vest | Options outstanding that have vested and are expected to vest at March 31, 2021 are as follows:
| Number of Shares Issued (In thousands) |  | Weighted-Average Exercise Price |  | Weighted-Average Remaining Contractual Life (Years) |  | Aggregate Intrinsic Value (In thousands)
Vested | 1,045 |  |  | $ | 16.09 |  |  | 6.54 |  | $ | 54,318 |
Expected to vest | 1,398 |  |  | 31.91 |  |  | 8.68 |  | 52,508 |
Total | 2,443 |  |  |  |  |  |  | $ | 106,826 |
Weighted-Average Assumptions Used to Estimate Fair Values of Share-Based Awards | The estimated fair values of employee stock options and ESPP shares were estimated using the Black-Scholes option pricing model based on the following weighted average assumptions:
|  | Three Months Ended March 31, |  |
|  | 2021 |  | 2020 |  |  |  |
Employee stock options |  |  |  |  |  |  |  |
Expected term (in years) |  | 6.0 |  | 6.0 |  |  |  |
Expected volatility |  | 77.69% |  | 74.00% |  |  |  |
Risk-free interest rate |  | 0.68% |  | 1.35% |  |  |  |
Expected dividend yield |  | —% |  | —% |  |  |  |
Employee stock purchase plan |  |  |  |  |  |  |  |
Expected term (in years) |  | 0.5 |  | 0.5 |  |  |  |
Expected volatility |  | 53.10% |  | 62.56% |  |  |  |
Risk-free interest rate |  | 0.09% |  | 1.57% |  |  |  |
Expected dividend yield |  | —% |  | —% |  |  |  |
Summary of Expense Relating to Employee and Nonemployee Stock-Based Payment Awards from Stock Options and RSUs | The following table summarizes stock-based compensation expense relating to employee and non-employee stock-based awards for the three months ended March 31, 2021 and 2020, included in the condensed consolidated statements of operations as follows (in thousands):
| Three Months Ended March 31, |  |
| 2021 |  | 2020 |  |  |  |
Cost of testing services | $ | 395 |  |  | $ | 247 |  |  |  |  |
Cost of product | 76 |  |  | 59 |  |  |  |  |
Cost of digital and other | 108 |  |  | 59 |  |  |  |  |
Research and development | 1,358 |  |  | 810 |  |  |  |  |
Sales and marketing | 1,659 |  |  | 971 |  |  |  |  |
General and administrative | 2,951 |  |  | 2,113 |  |  |  |  |
Total | $ | 6,547 |  |  | $ | 4,259 |  |  |  |  |

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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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