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Borrowings - Narrative (Details) - USD ($)	1 Months Ended			9 Months Ended
	Oct. 31, 2017	Aug. 31, 2016	Oct. 31, 2015	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Debt Instrument [Line Items]
Long term borrowings				$ 38,899,000		$ 38,700,000
Amortization of debt discount				194,000	$ 235,000
Debt covenant minimum cash balance				5,000,000
SVB and Oxford Term Loan
Debt Instrument [Line Items]
Repayment of debt extinguishment	$ 1,500,000
Loss on extinguishment of debt	2,200,000
Term Loan | SVB and Oxford Term Loan
Debt Instrument [Line Items]
Debt face amount		$ 35,200,000.0
Debt period payment, interest only period		6 months
Debt period payment, principal and interest period		27 months
Debt interest stated percentage		11.00%
Repayment of debt financing	29,100,000
Amortization of debt discount	700,000
Term Loan | SVB and Oxford Term Loan | Prime Rate
Debt Instrument [Line Items]
Basis spread on variable rate		7.75%
Term Loan | Pharmakon Term Loan
Debt Instrument [Line Items]
Long term borrowings				38,900,000		$ 38,700,000
Debt face amount	$ 40,000,000.0
Debt period payment, interest only period	35 months
Debt interest stated percentage	11.50%
Debt issuance costs	$ 1,300,000
Debt closing fee percentage	1.50%
Debt instrument fee amount	$ 600,000
Debt covenant minimum cash balance	$ 5,000,000
Debt borrowing capacity				$ 10,000,000
Debt effective percentage				12.30%		12.00%
Term Loan | Pharmakon Term Loan | Prepayment Penalty, 31-48 Months
Debt Instrument [Line Items]
Debt prepayment penalty percentage	2.00%
Term Loan | Pharmakon Term Loan | Prepayment Penalty, 49-60 Months
Debt Instrument [Line Items]
Debt prepayment penalty percentage	1.00%
Line of Credit | Revolving Credit Facility | SVB and Oxford Term Loan
Debt Instrument [Line Items]
Line of credit maximum borrowing capacity			$ 4,000,000.0
Line of credit percent of customer accounts receivable			80.00%
Line of Credit | Revolving Credit Facility | SVB and Oxford Term Loan | Prime Rate
Debt Instrument [Line Items]
Basis spread on variable rate			3.00%

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