Subsequent Event - MidCap Credit Facility - Additional Information (Detail) - Subsequent Event	Aug. 06, 2019 USD ($) $ / shares shares
Tranche 1 Warrants
Subsequent Event [Line Items]
Warrants to purchase of common stock \| shares	1,171,614
Exercise price of warrants \| $ / shares	$ 1.11
MidCap Credit Facility
Subsequent Event [Line Items]
Principal amount	$ 75,000,000
Credit facility, origination fee	$ 375,000
Exit fee percentage	6.00%
Interest on loans increased, percentage	2.00%
Term loan advance percentage of amount drawdown	3.25%
MidCap Credit Facility \| Between First Anniversary and Prior to Second Anniversary of Closing Date
Subsequent Event [Line Items]
Early termination fees, percentage	2.00%
MidCap Credit Facility \| Prior to First Anniversary of Closing Date
Subsequent Event [Line Items]
Early termination fees, percentage	3.00%
MidCap Credit Facility \| After Second Anniversary and Prior to Third Anniversary of Closing Date
Subsequent Event [Line Items]
Early termination fees, percentage	1.00%
Tranche 1 \| MidCap Credit Facility
Subsequent Event [Line Items]
Advance of borrowing	$ 40,000,000
Tranche 1 \| MidCap Credit Facility \| LIBOR
Subsequent Event [Line Items]
Interest rate (LIBOR)	6.75%
Interest rate floor	2.00%
Tranche 2 \| MidCap Credit Facility
Subsequent Event [Line Items]
Advance of borrowing	$ 10,000,000
Debt instrument, minimum target net revenue	30,000,000
Minimum cash covenant	$ 15,000,000
Tranche 2 \| MidCap Credit Facility \| LIBOR
Subsequent Event [Line Items]
Interest rate (LIBOR)	6.75%
Interest rate floor	2.00%
Tranche 1 and Tranche 2 \| MidCap Credit Facility
Subsequent Event [Line Items]
Debt payable number of equal monthly installments	36
Debt instrument payment term description	Principal on each term loan advance under Tranche 1 and Tranche 2 is payable in 36 equal monthly installments beginning September 1, 2021, until paid in full on August 1, 2024
Following Funding of Tranche 2 or Tranche 3 \| MidCap Credit Facility
Subsequent Event [Line Items]
Advance of borrowing	$ 25,000,000
Debt instrument payment term description	principal on each term loan advance under Tranche 3 is payable beginning on the later of (i) September 1, 2021, and (ii) the first day of the first full calendar month immediately following such term loan advance, in an amount equal to the outstanding term loan advance in respect of Tranche 3 divided by the number of full calendar months remaining before August 1, 2024.
Minimum cash covenant	$ 20,000,000
Following Funding of Tranche 2 or Tranche 3 \| MidCap Credit Facility \| LIBOR
Subsequent Event [Line Items]
Interest rate (LIBOR)	6.75%
Interest rate floor	2.00%

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Debt instrument exit fee percentage.

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Debt instrument floor rate.

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Debt instrument minimum cash covenant.

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Debt instrument payment number of equal monthly installments.

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Early termination fees percentage.

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- Definition

Term loan advance percentage of amount drawdown.

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

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-SubTopic 10
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Number of securities into which each warrant or right may be converted. For example, but not limited to, each warrant may be converted into two shares.

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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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Description of the frequency of periodic payments (monthly, quarterly, annual).

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Incremental percentage increase (decrease) in the stated rate on a debt instrument.

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- Definition

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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- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

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