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Net Loss per Share (Tables) | 12 Months Ended
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Dec. 31, 2020
Net Loss per Share |
Schedule of computation of the basic and diluted net loss per share attributable to common stockholders |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
​ |  | 2020 |  | 2019 |  | 2018
Numerator: | ​ | ​ | ​ |  | ​ | ​ |  | ​ | ​
Net loss | ​ | $ | (66,150) | ​ | $ | (77,187) | ​ | $ | (38,924)
Denominator: | ​ | ​ | ​ |  | ​ | ​ |  | ​ | ​
Weighted-average shares used to compute net loss per common share, basic and diluted | ​ |  | 34,396,446 |  |  | 25,894,024 |  |  | 22,364,515
Net loss per shares, basic and diluted | ​ | $ | (1.92) | ​ | $ | (2.98) | ​ | $ | (1.74)
Schedule of potentially dilutive securities excluded from diluted net loss per share calculations | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
​ |  | 2020 |  | 2019 |  | 2018
Options to purchase common stock | ​ | 4,648,120 |  | 3,681,521 |  | 3,178,441
Common stock warrants | ​ | 2,750,000 | ​ | 2,750,000 | ​ | 2,750,000
Restricted stock units | ​ | 244,545 | ​ | 278,482 | ​ | 418,450
ESPP shares | ​ | 28,445 | ​ | 40,275 | ​ | 52,134
Total |  | 7,671,110 |  | 6,750,278 |  | 6,399,025

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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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