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Stock-Based Incentive Compensation Plans - Narrative (Details) - USD ($) $ in Thousands			3 Months Ended		6 Months Ended
	Mar. 22, 2019	Jan. 01, 2019	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Oct. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost			$ 7,400		$ 7,400
Early exercise of stock options, share subject to repurchase (in shares)			46,811		46,811		74,019
Liability for early exercise of unvested stock options			$ 210		$ 210		$ 331
Stock-based compensation expense			1,814	$ 363	$ 3,685	$ 754
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost, expected period for recognition (in years)					2 years 10 months 25 days
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost, expected period for recognition (in years)					3 years 4 months 24 days
Unrecognized compensation cost			$ 9,200		$ 9,200
2018 EIP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Annual increase in shares reserved as percentage of prior year-end shares outstanding (percent)			5.00%		5.00%
Increase in number of shares of common stock reserved for issuance (in shares)		1,222,538
Number of shares of common stock available for future grants (in shares)			2,591,917		2,591,917
2018 ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Increase in number of shares of common stock reserved for issuance (in shares)	244,507
Unrecognized compensation cost			$ 300		$ 300
Number of shares reserved for issuance (in shares)								515,307
Accrued compensation and related expenses for employee payroll deductions			200		200		$ 400
Stock-based compensation expense			$ 200		$ 400

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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