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Stockholders' Equity - Schedule Of Common Stock Shares Reserved For Future Issuance (Details) - shares	Sep. 30, 2017	Dec. 31, 2016
Class Of Stock [Line Items]
Total number of shares reserved for future issuance	8,121,448	7,526,060
Common stock warrants issued and outstanding
Class Of Stock [Line Items]
Total number of shares reserved for future issuance	127,918	217,245
Options Issued and Outstanding
Class Of Stock [Line Items]
Total number of shares reserved for future issuance	2,765,902	2,977,218
Unvested restricted stock units
Class Of Stock [Line Items]
Total number of shares reserved for future issuance	453,063	105,529
Shares Available for Grant Under Future Stock Plans
Class Of Stock [Line Items]
Total number of shares reserved for future issuance	4,774,565	4,226,068