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Common Stock (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 Vote $ / shares shares | Dec. 31, 2016 $ / shares shares
Common Stock |  |
Common stock, authorized (in shares) | 150,000,000 | 150,000,000
Par value of common stock (in dollars per share) | $ / shares | $ 0.001 | $ 0.001
Common stock, issued (in shares) | 23,645,247 | 18,817,572
Common Stock, outstanding (in shares) | 23,645,247 | 18,817,572
Number of votes entitled to each common stock share | Vote | 1 |
Common stock dividends, declared or paid (in dollars per share) | $ / shares | $ 0 |
Shares reserved for future issuance (in shares) | 4,218,016 | 3,300,018
Common stock warrants |  |
Common Stock |  |
Shares reserved for future issuance (in shares) | 24,566 | 24,566
Stock options |  |
Common Stock |  |
Shares reserved for future issuance (in shares) | 3,669,791 | 2,939,968
Employee Stock Purchase Plan |  |
Common Stock |  |
Shares reserved for future issuance (in shares) | 523,659 | 335,484

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- Definition Aggregate number of common shares reserved for future issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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