Convertible Preferred Stock and Stockholders’ Equity (Deficit) - Schedule of Common Stock Reserved for Future Issuance (Details)	Jun. 30, 2019 shares
Class of Stock [Line Items]
Common stock initially reserved for future issuance (shares)	6,374,148
Stock options issued and outstanding
Class of Stock [Line Items]
Common stock initially reserved for future issuance (shares)	1,716,719
Authorized for future stock awards, option grants, or employee stock purchase program
Class of Stock [Line Items]
Common stock initially reserved for future issuance (shares)	432,935
Common Warrants
Class of Stock [Line Items]
Common stock initially reserved for future issuance (shares)	4,224,494