Financing Instruments - Loan and Security Agreement (Details)	Dec. 10, 2013 USD ($) covenant	Sep. 01, 2010 USD ($) covenant	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Line of Credit [Member] | Revolver Loan [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity		$ 12,000,000	$ 4,000,000	$ 2,200,000
Number of debt covenants | covenant		3
Capital expenditure limit (maximum)		$ 625,000
Eligible accounts receivable (percent)		85.00%
Eligible inventory (percent)		65.00%
Inventory included in vase rate calculation (up to)		$ 6,000,000
Fixed charge coverage ratio evaluation period		12 years
Long-term debt, gross			$ 4,300,000	$ 6,700,000
Weighted average interest rate			3.50%	4.60%
Line of Credit [Member] | Revolver Loan [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Fixed charge covenant ratio		100.00%
Secured Debt [Member] | Note Purchase Agreement [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 7,200,000.0
Period committed to ensure funding before maturity date	90 days
Number of debt covenants | covenant	4
Capital expenditure limit (maximum)	$ 625,000
Fixed charge coverage ratio evaluation period	12 months
Weighted average interest rate			23.70%	25.60%