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Stockholders' Equity - Schedule Of Common Stock Shares Reserved For Future Issuance (Details) - shares	Mar. 31, 2019	Dec. 31, 2018
Class Of Stock [Line Items]
Total number of shares reserved for future issuance	9,577,252	8,253,899
Common stock warrants issued and outstanding
Class Of Stock [Line Items]
Total number of shares reserved for future issuance	4,857	4,857
Options Issued and Outstanding
Class Of Stock [Line Items]
Total number of shares reserved for future issuance	1,885,914	2,094,137
Unvested restricted stock units
Class Of Stock [Line Items]
Total number of shares reserved for future issuance	896,759	547,891
Shares Available for Grant Under Future Stock Plans
Class Of Stock [Line Items]
Total number of shares reserved for future issuance	6,789,722	5,607,014