Debt instrument conversion of convertible notes maximum non qualified financing.

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Debt instrument conversion of convertible notes minimum qualified financing.

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Debt instrument minimum threshold percentage to extend maturity date on outstanding convertible notes.

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Loss on extinguishment of convertible notes.

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- Definition

Preferred stock issuance price percentage

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Amount of gain (loss) from the increase (decrease) in fair value of derivative and nonderivative instruments designated as fair value hedging instruments recognized in the income statement.

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Including the current and noncurrent portions, carrying amount of debt identified as being convertible into another form of financial instrument (typically the entity's common stock) as of the balance sheet date, which originally required full repayment more than twelve months after issuance or greater than the normal operating cycle of the company.

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The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period.

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The price per share of the conversion feature embedded in the debt instrument.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Fair value as of the balance sheet date of the embedded derivative or group of embedded derivatives classified as a liability.

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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The cash inflow from the issuance of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder.

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Convertible Notes - Additional Information (Details) - USD ($)	1 Months Ended		3 Months Ended		6 Months Ended
	Jun. 30, 2018	Apr. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Debt Instrument [Line Items]
Convertible notes issued to existing shareholders of redeemable convertible and convertible preferred stock		$ 14,400,000
Minimum threshold percentage on convertible notes to extend maturity date		80.00%
Conversion price per share	$ 4.7565			$ 4.7565		$ 4.7565
Convertible notes qualified financing		$ 25,000,000
Convertible notes non-qualified financing		$ 25,000,000
Interest expense			$ 400,000	$ 100,000	$ 500,000	$ 300,000
Principal and accrued interest on convertible notes	$ 14,600,000			14,600,000		14,600,000
Loss on extinguishment of convertible notes	$ 400,000					370,000
Series F Preferred Stock
Debt Instrument [Line Items]
Conversion price per share		$ 3.8590
Series G Redeemable Convertible Preferred Stock
Debt Instrument [Line Items]
Issuance of redeemable convertible preferred stock	1,067,550
Convertible Preferred Stock
Debt Instrument [Line Items]
Issuance of redeemable convertible preferred stock	1,997,709
Convertible Notes
Debt Instrument [Line Items]
Convertible notes annual interest rate		8.00%
Preferred stock issuance price percentage		90.00%
Liability recognized on estimated fair value of embedded derivative		$ 400,000
Debt issuance costs		$ 100,000
Interest expense				200,000		200,000
Convertible Notes \| Other Expense, Net
Debt Instrument [Line Items]
Change in fair value of convertible notes embedded derivative liability				$ 1,200,000		$ 1,200,000