Debt - Summary of Components of Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Debt Instrument [Line Items]
Amortization of debt issuance costs	$ 77	$ 79	$ 152	$ 219
Mark to market of SWK Warrant 2 (defined below)			0	152
Total	779	693	1,665	1,461
Warrants 1 and 2
Debt Instrument [Line Items]
Amortization of debt discount	87	170	164	537
Warrant 2
Debt Instrument [Line Items]
Mark to market of SWK Warrant 2 (defined below)	(122)	0	(80)	0
Term Loans \| Term Loans
Debt Instrument [Line Items]
Interest expense	458	179	807	317
Accretion of termination fees (over term of Term Loan at rate of 8%)	$ 49	$ 98	$ 160	$ 140
Effective interest rate percentage	31.00%	15.00%	31.00%	15.00%
Accretion of termination fees percentage	8.00%	8.00%	8.00%	8.00%
Line of Credit \| 2016 Credit and Security Agreement
Debt Instrument [Line Items]
Interest expense	$ 174	$ 117	$ 347	$ 198
Line of Credit \| Seasonal Facility
Debt Instrument [Line Items]
Interest expense	0	23	0	23
Subordinated Debt \| Subordinated Promissory Note
Debt Instrument [Line Items]
Interest expense	39	23	78	23
Amortization of debt discount	17	0	32	0
Capital Leases
Debt Instrument [Line Items]
Interest expense	0	2	5	2
Other
Debt Instrument [Line Items]
Interest expense	$ 0	$ 2	$ 0	$ 2

Accretion Expense, Debt Discount Associated With Warrant

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- Definition

Accretion Expense, Termination Fees

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

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Amount of amortization expense attributable to debt issuance costs.

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

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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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