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Stockholders' Equity - Schedule of Common Stock Reserved for Future Issuance (Details) - shares	Dec. 31, 2018	Dec. 31, 2017
Class Of Stock [Line Items]
Common stock, reserved for future issuance	2,021,543	1,987,682
Warrants Issued and Outstanding
Class Of Stock [Line Items]
Common stock, reserved for future issuance	51,003	51,003
Stock Option Awards Issued and Outstanding
Class Of Stock [Line Items]
Common stock, reserved for future issuance	1,407,049	1,203,627
Authorized for Grants under the 2016 Equity Incentive Plan
Class Of Stock [Line Items]
Common stock, reserved for future issuance	463,491	633,052
Authorized for grants under the 2016 Employee Stock Purchase Plan
Class Of Stock [Line Items]
Common stock, reserved for future issuance	100,000	100,000