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Gross number of share options (or share units) granted during the period.

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Stockholders' Equity (Deficit) - Additional Information (Details) - USD ($)			1 Months Ended		10 Months Ended	12 Months Ended
	Nov. 15, 2018	Oct. 16, 2018	Nov. 30, 2018	Oct. 31, 2018	Dec. 31, 2017	Dec. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Research and development					$ 1,333,721	$ 4,943,149
Net proceeds, after deducting underwriting discounts, commissions and related transaction costs						$ 64,475,457
Proceeds from issuance of common stock					$ 100
Number of shares reserved for issuance					1,189,773	2,126,877
Weighted-average fair value of options granted					$ 0	$ 5.79
Dividends paid						$ 0
2018 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares reserved for issuance				2,229,773		1,363,119
Number of new shares approved for issuance under the plan				1,040,000
Equity incentive plan description						The number of shares of common stock reserved for issuance under the 2018 Plan will automatically increase on January 1 of each calendar year, starting on January 1, 2019 through January 1, 2028, in an amount equal to 5.0% of the total number of shares of the Company’s capital stock outstanding on the last day of the calendar month before the date of each automatic increase, or a lesser number of shares determined by the Company’s board of directors.
2018 Equity Incentive Plan \| Common Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Minimum options exercise price as percentage of fair market value of common stock						100.00%
Remaining vesting period						3 years
2018 Equity Incentive Plan \| Common Stock Options \| Tranche One
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting percentage						25.00%
2018 Equity Incentive Plan \| Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares that may be issued on exercise of ISO						6,689,319
2018 Equity Incentive Plan \| Maximum \| Common Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award expiration period						10 years
2017 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares reserved for issuance				333,119
Number of shares underlying award granted under the plan				856,654
Unvested shares issued under early exercise						446,171
Unvested stock liability					$ 0	$ 300,000
2017 Equity Incentive Plan \| Short Term Portion Of Unvested Stock Liability
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unvested stock liability						100,000
2017 Equity Incentive Plan \| Long Term Portion Of Unvested Stock Liability
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unvested stock liability						$ 200,000
2018 Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of new shares approved for issuance under the plan				343,275
Employee stock purchase plan description						The number of shares of the Company’s common stock reserved for issuance will automatically increase on January 1 of each calendar year, beginning on January 1, 2019 through January 1, 2028, by the lesser of (1) 1.0% of the total number of shares of the Company’s common stock outstanding on the last day of the calendar month before the date of the automatic increase, and (2) 343,275 shares; provided that before the date of any such increase, the Company’s board of directors may determine that such increase will be less than the amount set forth in clauses (1) and (2)
2018 and 2017 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares underlying award granted under the plan						866,654
2018 and 2017 Equity Incentive Plan \| Employee And Non Employee Stock Option
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized compensation cost related to outstanding options					$ 0	$ 4,579,471
Expected recognition period of unrecognized compensation cost					0 years	3 years 8 months 4 days
Underwriters Option
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Sale of stock	445,097		445,097
Proceeds from issuance of common stock	$ 5,800,000		$ 5,800,000
Common Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Sale of stock						446,171
Conversion of convertible securities, shares of common stock issued				878,834		878,834
Common Stock \| IPO
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Sale of stock		4,670,000		4,670,000		5,115,097
Sale of stock, price per share		$ 14.00		$ 14.00
Net proceeds, after deducting underwriting discounts, commissions and related transaction costs		$ 58,700,000		$ 58,700,000
Founder Notes \| Common Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Sale of stock					8,620,000
Sale of stock, price per share					$ 0.00001
Biocon
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Sale of stock, price per share					$ 0.005
Biocon \| IPO
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Sale of stock		228,060
Biocon \| Common Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Sale of stock				228,060	2,088,074	228,060
Collaboration and License Agreement \| Biocon Limited
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Research and development					$ 9,689
Collaboration and License Agreement \| Biocon Limited \| Common Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Sale of stock					2,088,074
Sale of stock, price per share					$ 0.005