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Stock-Based Compensation - Additional Information (Details)				1 Months Ended		12 Months Ended
	Apr. 17, 2018 Installment shares	Nov. 29, 2017 shares	Oct. 11, 2017 shares	Dec. 31, 2019 USD ($) $ / shares shares	May 31, 2018 $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2017 USD ($)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares available for issuance				4,159,626		4,159,626	2,773,249
Recognized stock-based compensation expense | $						$ 3,694,000	$ 2,793,000	$ 470,000
Options Issued and Outstanding
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares available for issuance				2,562,800		2,562,800	1,122,677
Aggregate intrinsic value of options exercised | $						$ 67,000	$ 78,000
Option granted						1,896,527
Options Issued and Outstanding | Employees and Directors
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Option granted						1,886,687
Weighted-average grant date fair value of options granted | $ / shares						$ 4.83
Options Issued and Outstanding | Employees
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Option granted							926,838
Weighted-average grant date fair value of options granted | $ / shares							$ 9.23
Unrecognized compensation expense | $				$ 9,400,000		$ 9,400,000
Unrecognized compensation expense, estimated weighted-average period for recognition						2 years 9 months 18 days
Options Issued and Outstanding | Non-employees
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Option granted						9,840	7,200
Weighted-average grant date fair value of options granted | $ / shares						$ 7.61	$ 12.51
Unrecognized compensation expense | $				26,000		$ 26,000
Unrecognized compensation expense, estimated weighted-average period for recognition						2 years 1 month 20 days
Restricted Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares granted	2,000
Number of quarterly installment in which restriction lapse | Installment	4
Recognized stock-based compensation expense | $						$ 4,000,000	$ 900,000	$ 400,000
Unrecognized stock-based compensation expense | $				$ 0		$ 0
Restricted stock units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares available for issuance				828,935		828,935	24,960
Unrecognized compensation expense, estimated weighted-average period for recognition						3 years 9 months
Shares granted						813,335
Recognized stock-based compensation expense | $						$ 74,000	$ 35,000
Unrecognized stock-based compensation expense | $				$ 1,100,000		$ 1,100,000
Restricted stock units | Employees
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares granted				813,335	24,960
Weighted-average grant date fair value | $ / shares				$ 1.27	$ 9.03
2017 Stock Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares reserved for issuance		630,662	537,914	537,914		537,914
Number of additional shares reserved for issuance		1,866,009	630,662
2017 Stock Incentive Plan | Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Terms of stock based options granted						10 years
2018 Stock Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of additional shares added on outstanding shares						4.00%
Shares available for issuance				0		0
2018 Stock Incentive Plan | Minimum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares reserved for issuance				2,200,260		2,200,260
2018 Stock Incentive Plan | Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares reserved for issuance				3,322,473		3,322,473
2018 Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares reserved for issuance							275,030
Percentage of additional shares added on outstanding shares							1.00%
Number of shares available for sale						0	0
2018 Employee Stock Purchase Plan | Minimum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of additional shares reserved for issuance							543,926
2018 Employee Stock Purchase Plan | Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of additional shares reserved for issuance							555,583

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