v3.19.3

Convertible Preferred Stock and Stockholders’ Equity (Deficit) - Stock Options Narrative (Details) - $ / shares	1 Months Ended	3 Months Ended		9 Months Ended
	Aug. 31, 2018	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock initially reserved for future issuance (shares)		6,374,148		6,374,148
Employee Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares, granted (in shares)		29,800	385	706,640
Exercise price (USD per share)		$ 2.33	$ 6.00	$ 3.82
Weighted-average grant date fair value (USD per share)		$ 1.42		$ 2.19	$ 2.99
2018 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock initially reserved for future issuance (shares)	1,499,454	305,593		305,593
Number of new shares issued under plan (in shares)	1,000,000
Incremental rate at which the shares reserved for issuance increase				5.00%
Shares of common stock subject to outstanding options (in shares)		1,844,061		1,844,061

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