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Net Loss Per Share (Tables) | 12 Months Ended
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Dec. 31, 2020
Earnings Per Share [Abstract] |
Summary of Basic and Diluted Net Loss Per Share of Common Stock | The following table summarizes the computation of basic and diluted net loss per share of our common stock for 2020, 2019 and 2018:
| Year Ended December 31,
| 2020 |  | 2019 |  | 2018
| (in thousands, except share and per share data)
Numerator: |  |  |  |  |
Net loss | $ | (98,849) |  |  | $ | (53,845) |  |  | $ | (55,545) |
Denominator: |  |  |  |  |
Weighted-average common shares outstanding, basic and diluted | 51,036,824 |  |  | 48,731,791 |  |  | 46,456,825 |
Net loss per share, basic and diluted | $ | (1.94) |  |  | $ | (1.10) |  |  | $ | (1.20) |
Anti-Dilutive Securities Excluded from Computation Diluted Weighted Average Shares Outstanding | The following potentially dilutive securities outstanding, prior to the use of the treasury stock method, have been excluded from the computation of diluted weighted-average shares outstanding for the respective periods below because they would have been anti-dilutive:
| Year Ended December 31,
| 2020 |  | 2019 |  | 2018
Options to purchase common stock | 1,933,013 |  |  | 2,705,458 |  |  | 3,713,179 |
Unvested restricted stock | — |  |  | — |  |  | 21,677 |
Unvested restricted stock units | 2,941,914 |  |  | 2,936,924 |  |  | 2,773,773 |
Shares to be issued under ESPP | 101,658 |  |  | 53,167 |  |  | 74,634 |
Convertible senior notes | 9,299,432 |  |  | 5,530,176 |  |  | 5,530,176 |
Total | 14,276,017 |  |  | 11,225,725 |  |  | 12,113,439 |

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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