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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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The percentage points added to the reference rate to compute the variable rate on the interest rate derivative.

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Fair value portion of notes payable.

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Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts.

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Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Summary of Significant Accounting Policies Details [Line Items]
Product sales, net	$ 14,677	$ 13,912	$ 27,913	$ 28,120
Assets	186,779	193,532	186,779	193,532	$ 184,585
Domestic
Summary of Significant Accounting Policies Details [Line Items]
Product sales, net	11,400	13,000	21,600	27,800
Assets	125,900	124,800	125,900	124,800
Foreign
Summary of Significant Accounting Policies Details [Line Items]
Product sales, net	4,900	3,400	9,200	6,300
Assets	$ 60,900	$ 68,700	$ 60,900	$ 68,700
Sales Revenue \| Customer concentration risk \| Two Customers
Summary of Significant Accounting Policies Details [Line Items]
Concentration risk	49.00%		48.00%
Sales Revenue \| Customer concentration risk \| Three Customers
Summary of Significant Accounting Policies Details [Line Items]
Concentration risk		50.00%		52.00%
Sales Revenue \| Customer concentration risk \| Customer One
Summary of Significant Accounting Policies Details [Line Items]
Concentration risk	35.00%	26.00%	35.00%	26.00%
Sales Revenue \| Customer concentration risk \| Customer Two
Summary of Significant Accounting Policies Details [Line Items]
Concentration risk	14.00%	10.00%	13.00%	13.00%
Sales Revenue \| Customer concentration risk \| Customer Three
Summary of Significant Accounting Policies Details [Line Items]
Concentration risk		14.00%		13.00%
Accounts Receivable
Summary of Significant Accounting Policies Details [Line Items]
Concentration risk			49.00%	67.00%
Convertible Notes Payable
Summary of Significant Accounting Policies Details [Line Items]
Net carrying value of notes	$ 115,700		$ 115,700
Face value of notes	143,750		143,750
Term Loan 2021 \| Convertible Notes Payable
Summary of Significant Accounting Policies Details [Line Items]
Net carrying value of notes	14,200		14,200
Face value of notes	$ 15,000		$ 15,000
London Interbank Offered Rate (LIBOR) \| Term Loan 2021 \| Convertible Notes Payable
Summary of Significant Accounting Policies Details [Line Items]
Basis spread on variable rate	9.00%		9.00%