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Stockholders' Equity (Deficit) - Schedule of Common Stock Reserved for Future Issuance (Details) - shares | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Class Of Stock [Line Items] |  |
Common stock, reserved for future issuance | 1,901,140 | 4,947,200
Conversion of Series A, B, C, And D Preferred Convertible Stock |  |
Class Of Stock [Line Items] |  |
Common stock, reserved for future issuance |  | 753,687
Conversion of Series E, F, And G Preferred Redeemable Convertible Stock |  |
Class Of Stock [Line Items] |  |
Common stock, reserved for future issuance |  | 2,327,170
Warrants Issued and Outstanding |  |
Class Of Stock [Line Items] |  |
Common stock, reserved for future issuance | 51,003 | 788,338
Stock Option Awards Issued and Outstanding |  |
Class Of Stock [Line Items] |  |
Common stock, reserved for future issuance | 1,040,387 | 756,692
Authorized for Grants under the 2013 Equity Incentive Plan |  |
Class Of Stock [Line Items] |  |
Common stock, reserved for future issuance | 0 | 321,313
Authorized for Grants under the 2016 Equity Incentive Plan |  |
Class Of Stock [Line Items] |  |
Common stock, reserved for future issuance | 709,750 |
Authorized for grants under the 2016 Employee Stock Purchase Plan |  |
Class Of Stock [Line Items] |  |
Common stock, reserved for future issuance | 100,000 |

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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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