Debt - Components of Interest Expense (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Amortization of deferred financing costs	$ 351	$ 362
Total interest expense	3,195	3,570
SWK Warrants 1 and 2
Debt Instrument [Line Items]
Amortization of debt discount associated with SWK Warrants 1 and 2 (defined below)	691	1,663
SWK Warrant 2
Debt Instrument [Line Items]
Mark to market of the additional warrant feature	(63)	59
2013 Loan and Security Agreement
Debt Instrument [Line Items]
Write-off of debt issuance costs related to 2013 Loan and Security Agreement	0	282
Term Loan \| A&R Credit Agreement
Debt Instrument [Line Items]
Interest expense on debt	883	658
Accretion of termination fees (over term of Term Loan at rate of 8%)	441	$ 187
Amortization of deferred financing costs	$ 75
Exit fee percentage over loan rate	8.00%	8.00%
Effective interest rate	28.00%	15.00%
Line of Credit \| 2013 Loan and Security Agreement
Debt Instrument [Line Items]
Interest expense on debt	$ 0	$ 48
Line of Credit \| 2016 Credit and Security Agreement
Debt Instrument [Line Items]
Interest expense on debt	601	311
Line of Credit \| Seasonal Facility
Debt Instrument [Line Items]
Interest expense on debt	138	0
Subordinated Debt \| Subordinated Promissory Note
Debt Instrument [Line Items]
Interest expense on debt	101	0
Amortization of debt discount associated with SWK Warrants 1 and 2 (defined below)	38	0
Capital Lease Obligations
Debt Instrument [Line Items]
Interest expense on debt	8	0
Other
Debt Instrument [Line Items]
Interest expense on debt	$ 6	$ 0

Accretion Expense, Debt Discount Associated With Warrant

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- Definition

Accretion Expense, Termination Fees

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- Definition

Debt Instrument, Termination Fee As A Percent Of Aggregate Principal Amount

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- Definition

Amount of amortization expense attributable to debt issuance costs.

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- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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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 of expense (income) related to adjustment to fair value of warrant liability.

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- Definition

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

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

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- Definition

Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.

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