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Stockholders' Equity - Schedule of Common Stock Reserved for Future Issuance (Details) - shares | Jun. 30, 2018 | Dec. 31, 2017
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Class Of Stock [Line Items] |  |  |
Common stock, reserved for future issuance | [1] | 2,230,867 | 1,987,682
Warrants Issued and Outstanding |  |  |
Class Of Stock [Line Items] |  |  |
Common stock, reserved for future issuance | [1] | 51,003 | 51,003
Stock Option Awards Issued and Outstanding |  |  |
Class Of Stock [Line Items] |  |  |
Common stock, reserved for future issuance | [1] | 1,955,875 | 1,203,627
Authorized for Grants under the 2016 Equity Incentive Plan |  |  |
Class Of Stock [Line Items] |  |  |
Common stock, reserved for future issuance | [1] | 123,989 | 633,052
Authorized for grants under the 2016 Employee Stock Purchase Plan |  |  |
Class Of Stock [Line Items] |  |  |
Common stock, reserved for future issuance | [1] | 100,000 | 100,000
[1] | Treasury stock in the amount of 285,528 and 135,000 as of June 30, 2018 and December 31, 2017, respectively, are excluded from the table above.

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- Definition Aggregate number of common shares reserved for future issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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