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Summary of Significant Accounting Policies (Tables) | 3 Months Ended
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Mar. 31, 2021
Summary of Significant Accounting Policies |
Schedule of potential common shares, presented based on amounts outstanding at each period end, excluded from computation of diluted net loss per share attributable to common stockholders | ​
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​ | ​ | ​ | March 31,
​ |  |  | 2021 |  | 2020
Stock options | ​ | ​ | ​ | 3,641,903 | ​ | ​ | 4,058,347
Restricted stock units | ​ | ​ |  | 97,631 | ​ |  | 118,662
Potential common shares | ​ | ​ | ​ | 3,739,534 | ​ | ​ | 4,177,009

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- Definition Tabular disclosure of the effect of income (loss) on an entity's diluted earnings per share. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=121326447&loc=d3e1278-109256 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=120380238&loc=d3e4984-109258 + Details
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