Long-term Debt - Narratives (Details)	9 Months Ended
Sep. 30, 2019 USD ($) tranche	Nov. 30, 2018 USD ($)
OrbiMed Term Loans (related party)
Long-term Debt
Number of Tranches \| tranche	2
Minimum Cash Balance	$ 2,000,000
Interest due to unpaid obligation	3.00%
Interest Rate (as a percent)	9.86%	7.75%
Number of Installment	60 months
Exit fee (as a percent)	10.00%
Administration Fees	$ 10,000
Debt issuance costs	3,300,000
Interest Expenses	2,700,000
Amortization of debt issuance costs	$ 400,000
OrbiMed Term Loans (related party) \| Prior to second anniversary
Long-term Debt
Percentage of prepayment penalty on prepaid principal amount	10.00%
OrbiMed Term Loans (related party) \| After second anniversary but prior to third anniversary
Long-term Debt
Percentage of prepayment penalty on prepaid principal amount	5.00%
OrbiMed Term Loans (related party) \| After third anniversary
Long-term Debt
Percentage of prepayment penalty on prepaid principal amount	2.50%
OrbiMed Term Loans (related party) \| One month LIBOR
Long-term Debt
Variable Interest Rate (as a percent)	2.00%
OrbiMed Term Loans (related party) \| Minimum
Long-term Debt
Consolidated Revenue	$ 7,500,000
OrbiMed Term Loans (related party) \| Maximum
Long-term Debt
Debt Amount	35,000,000
Tranche One
Long-term Debt
Debt Amount	30,000,000	$ 30,000,000
Tranche Two
Long-term Debt
Debt Amount	$ 5,000,000

The term of debt instrument interest payment.

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Percentage of penalty to be paid on the event of default in meeting the obligation.

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The amount of cash required to be maintained as part of security in relation to debt.

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Number of tranches of debt obtained.

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Percentage of exit fee to be paid on the principal amount at the time of maturity or prepayment.

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No definition available.

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Percentage of penalty to be paid on principal amount of debt.

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The amount of administrative fee to be paid on last day of each quarter.

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Amount of amortization expense attributable to debt issuance costs.

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- Definition

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

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No definition available.

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Face (par) amount of debt instrument at time of issuance.

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- Definition

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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- Definition

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

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Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

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