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Net Loss per Share Attributable to Common Stockholders - Summary of Anti-dilutive Securities Excluded from Computation of Diluted Net Loss per Share (Parenthetical) (Details) $ / shares in Units, $ in Millions	Jun. 30, 2018 USD ($) $ / shares
2017 Convertible Notes
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Convertible notes, principal amount	$ 10.0
Convertible notes, accrued but unpaid interest	$ 2.5
Convertible notes, conversion price per share of common stock | $ / shares	$ 5.00
2018 Convertible Notes | Initial Public Offering
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Convertible notes, principal amount	$ 33.0
Convertible notes, accrued but unpaid interest	$ 0.8
Percentage of initial public offering per share price	80.00%
2018 Convertible Notes | Initial Public Offering | Common Stock
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Convertible notes, conversion price per share of common stock | $ / shares	$ 10.00

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The 2018 convertible notes were automatically convertible into shares of the Company’s common stock at a price equal to 80% of the initial price to public in a qualified initial public offering if such offering was completed prior to February 2, 2019.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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