Debt - Summary of Interest Expense Components (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2017	Mar. 31, 2016	Apr. 17, 2015
Debt Instrument [Line Items]
Amortization of deferred financing costs	$ 140	$ 61
Amortization of debt discount associated with SWK Warrants 1 and 2 (defined below)	367	411
Mark to market of SWK Warrant 2 (defined below)	0	59
Total	767	789
Loans payable \| Credit agreement
Debt Instrument [Line Items]
Interest expense	138	180
Accretion of termination fees (over term of Term Loan at rate of 8%)	$ 41	$ 46
Accretion of termination fees over Term Loan (as percent)	8.00%	8.00%	8.00%
Loans payable \| Credit agreement \| LIBOR
Debt Instrument [Line Items]
Effective interest rate (as percent)	15.00%	15.00%
Line of credit \| 2013 Loan and Security Agreement
Debt Instrument [Line Items]
Interest expense	$ 0	$ 32
Line of credit \| 2016 Credit and Security Agreement
Debt Instrument [Line Items]
Interest expense	$ 81	$ 0

Accretion Expense, Debt Discount Associated With Warrant

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- Definition

Accretion Expense, Termination Fees

+ References

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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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- Definition

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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