Debt instrument interest only portion maturity Period.

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- Definition

Debt instrument london interbank offered rate subject to floor rate.

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Debt instrument maturity period.

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Debt instrument prepayment fee percent.

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- Definition

Debt instrument principal and interest payment maturity period.

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Fair value assumptions expected life term.

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- Definition

Line of credit facility additional borrowing capacity.

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- Definition

Value of input used to measure alternative investment.

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Exercise price per share or per unit of warrants or rights outstanding.

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Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

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Number of warrants or rights outstanding.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Amount of the fee that accompanies borrowing money under the debt instrument.

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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 discount.

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Amount of debt discount to be amortized after one year or the normal operating cycle, if longer.

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Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.

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The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

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Long-Term Debt - Additional Information - MidCap Financial CSA (Details)	Jun. 29, 2018 USD ($) $ / shares shares	Jun. 30, 2019 USD ($)	Dec. 31, 2018 USD ($) $ / shares	Nov. 18, 2018 USD ($)	Aug. 31, 2018 $ / shares shares
Term Loan \| Series D-1 Convertible Preferred Stock
Debt Instrument [Line Items]
Warrants to purchase, Fair value preferred stock \| $ / shares					$ 20.56
Shares of common stock \| shares					6,814
MidCap Financial CSA
Debt Instrument [Line Items]
Term loan facility available	$ 15,000,000
Annual interest rate bears	7.50%
LIBOR subject to floor rate	1.50%
Debt instrument maturity period	60 months
Debt instrument interest only portion maturity period	18 months
Debt instrument principal and interest maturity period	42 months
Debt issuance fees paid	$ 300,000
Prepayment fee percentage	4.00%
Prepayment fee		$ 400,000
Additional amount invested in term loan facility		1,000,000
MidCap Financial CSA \| Term Loan \| Series D-1 Convertible Preferred Stock
Debt Instrument [Line Items]
Shares called by warrant (in shares) \| shares	625,000
Warrants to purchase, Fair value preferred stock \| $ / shares	$ 0.48
Debt discount and amortization of interest expense	$ 200,000
Shares of common stock \| shares					14,602
MidCap Financial CSA \| Term Loan \| Series D-1 Convertible Preferred Stock \| Expected life (in years)
Debt Instrument [Line Items]
Fair value assumptions term	10 years
MidCap Financial CSA \| Term Loan \| Series D-1 Convertible Preferred Stock \| Risk-free interest rate
Debt Instrument [Line Items]
Fair value assumptions	0.0283
MidCap Financial CSA \| Term Loan \| Series D-1 Convertible Preferred Stock \| Volatility
Debt Instrument [Line Items]
Fair value assumptions	0.59
MidCap Financial CSA \| Other Long-term Liabilities
Debt Instrument [Line Items]
Debt discount charge		$ 400,000
MidCap Financial CSA \| First Year
Debt Instrument [Line Items]
Prepayment fee percentage	4.00%
MidCap Financial CSA \| Second Year
Debt Instrument [Line Items]
Prepayment fee percentage	3.00%
MidCap Financial CSA \| Thereafter
Debt Instrument [Line Items]
Prepayment fee percentage	2.00%
MidCap Financial CSA \| Tranche 1
Debt Instrument [Line Items]
Term loan facility available	$ 10,000,000
Term loan facility borrowed from Tranche 1	10,000,000
MidCap Financial CSA \| Tranche 2
Debt Instrument [Line Items]
Term loan facility available	2,500,000.0
MidCap Financial CSA \| Tranche 3
Debt Instrument [Line Items]
Term loan facility available	2,500,000.0
Western Alliance LSA
Debt Instrument [Line Items]
Repayment of outstanding term loan	$ 7,000,000
Prepayment fee			$ 160,000	$ 210,000
Warrants to purchase, Fair value preferred stock \| $ / shares			$ 6.99