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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Summary of Significant Accounting Policies Details [Line Items]
Product sales, net	$ 16,375	$ 9,436	$ 44,288	$ 37,556
Assets	192,882	190,666	192,882	190,666	$ 184,585
Domestic
Summary of Significant Accounting Policies Details [Line Items]
Product sales, net	13,300	8,700	34,900	36,500
Assets	131,900	121,200	131,900	121,200
Foreign
Summary of Significant Accounting Policies Details [Line Items]
Product sales, net	5,000	2,600	14,200	8,900
Assets	$ 61,000	$ 69,500	$ 61,000	$ 69,500
Sales Revenue \| Customer concentration risk \| Three Customers
Summary of Significant Accounting Policies Details [Line Items]
Concentration risk	49.00%	54.00%	54.00%	52.00%
Sales Revenue \| Customer concentration risk \| Customer One
Summary of Significant Accounting Policies Details [Line Items]
Concentration risk	25.00%	33.00%	32.00%	28.00%
Sales Revenue \| Customer concentration risk \| Customer Two
Summary of Significant Accounting Policies Details [Line Items]
Concentration risk	12.00%	11.00%	12.00%	12.00%
Sales Revenue \| Customer concentration risk \| Customer Three
Summary of Significant Accounting Policies Details [Line Items]
Concentration risk	12.00%	10.00%	10.00%	12.00%
Accounts Receivable
Summary of Significant Accounting Policies Details [Line Items]
Concentration risk			56.00%	74.00%
Convertible Notes Payable
Summary of Significant Accounting Policies Details [Line Items]
Net carrying value of notes	$ 117,800		$ 117,800
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	24,200		24,200
Face value of notes	$ 25,000		$ 25,000
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%