Debt - Summary of Outstanding Borrowings (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Long-term debt	$ 13,979	$ 19,314
Capital Leases	45	107
Short-term portion	(13,979)	(19,314)
Total long-term debt	0	0
Line of Credit \| 2016 Credit and Security Agreement
Debt Instrument [Line Items]
Long-term debt	4,887	10,015
Term Loans \| Term Loans
Debt Instrument [Line Items]
Long-term debt	8,250	8,500
Discount on Term Loans	(555)	(631)
Unamortized debt issuance costs related to Term Loans	(207)	(220)
Subordinated Debt \| Subordinated Promissory Note, net
Debt Instrument [Line Items]
Long-term debt	$ 1,559	$ 1,543

Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

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