Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Schedule of Common Stock Reserved for Future Issuance (Details)

v3.19.3
Stockholders' Equity - Schedule of Common Stock Reserved for Future Issuance (Details) - shares
Sep. 30, 2019
Dec. 31, 2018
Class Of Stock [Line Items]    
Common stock, reserved for future issuance 2,248,000 2,022,000
Warrants Issued and Outstanding    
Class Of Stock [Line Items]    
Common stock, reserved for future issuance 51,000 51,000
Stock Option Awards Issued and Outstanding    
Class Of Stock [Line Items]    
Common stock, reserved for future issuance 1,866,000 1,407,000
Authorized for Grants under the 2016 Equity Incentive Plan    
Class Of Stock [Line Items]    
Common stock, reserved for future issuance 145,000 464,000
Authorized for grants under the 2016 Employee Stock Purchase Plan    
Class Of Stock [Line Items]    
Common stock, reserved for future issuance 186,000 100,000