Long-Term Debt - Additional Information (Details) - USD ($) $ in Thousands		3 Months Ended	4 Months Ended	9 Months Ended	12 Months Ended
	Aug. 14, 2018	Sep. 30, 2020	Sep. 30, 2020	Sep. 30, 2020	Sep. 30, 2020	Jun. 30, 2020	Apr. 29, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Debt instrument, borrowed amount		$ 67,595	$ 67,595	$ 67,595	$ 67,595
Madryn Credit Agreement
Debt Instrument [Line Items]
Debt instrument, principal amount		$ 70,000	$ 70,000	$ 70,000	$ 70,000
Debt instrument, maturity date				Sep. 30, 2022
Debt instrument, interest rate	9.00%	10.50%	10.50%	10.50%	10.50%		12.00%
Interest rate, paid in cash	9.00%	50.00%
Interest rate, paid in kind	4.00%	50.00%
Debt instrument, interest rate terms				Effective August 14, 2018, interest on the Madryn loan is 9.00%, payable quarterly. Previously, interest was payable quarterly, at the Company’s option, as follows: cash interest 9.00% during the interest only period, which was 3 years or 12 principal payments after closing, plus an additional 4.00% rate, paid in kind (“PIK”).
Minimum revenue and liquidity covenants				(i) minimum reported revenue targets for any four consecutive fiscal quarter period of an amount equal to the greater of (A) $100,000 and (B) one hundred and fifty percent (150%) of the aggregate outstanding amount of the loans as of the last day of such four consecutive fiscal quarter period, (ii) minimum levels of cash held in deposit accounts controlled by Madryn to be no less than $2,000 and (iii) minimum levels of cash held in all deposit accounts, plus availability under the CNB Credit Facility (as defined below), to be no less than $5,000.
Additional cash proceeds target from issuance of equity			$ 2,000
Madryn Credit Agreement | Debt Instrument, Redemption, Period One
Debt Instrument [Line Items]
Percentage of principal amount of borrowings being prepaid				8.00%
Madryn Credit Agreement | Debt Instrument, Redemption, Period Two
Debt Instrument [Line Items]
Percentage of principal amount of borrowings being prepaid				6.50%
Madryn Credit Agreement | Debt Instrument, Redemption, Period Three
Debt Instrument [Line Items]
Percentage of principal amount of borrowings being prepaid				5.00%
Madryn Credit Agreement | Debt Instrument, Redemption, Period Four
Debt Instrument [Line Items]
Percentage of principal amount of borrowings being prepaid				4.00%
Madryn Credit Agreement | Debt Instrument, Redemption, Period Five
Debt Instrument [Line Items]
Percentage of principal amount of borrowings being prepaid				3.00%
Madryn Credit Agreement | Debt Instrument Redemption Period Six
Debt Instrument [Line Items]
Percentage of principal amount of borrowings being prepaid				2.00%
Madryn Credit Agreement | Minimum
Debt Instrument [Line Items]
Revenue targets amount	$ 100,000				$ 75,000	$ 85,000
Revenue targets percentage	150.00%
Minimum levels of cash held in deposit accounts	$ 2,000
Minimum levels of cash held	$ 5,000
Cash proceeds target from issuance of equity			5,000
Tranche A-1 and A-2 and B | Madryn Credit Agreement
Debt Instrument [Line Items]
Debt instrument, borrowed amount		$ 60,000	60,000	$ 60,000	60,000			$ 60,000
Tranche C | Madryn Credit Agreement
Debt Instrument [Line Items]
Debt instrument, undrawn amount		$ 10,000	$ 10,000	$ 10,000	$ 10,000