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Debt - Borrowings (Details) - USD ($)			12 Months Ended
	Mar. 31, 2014	Jun. 01, 2009	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Sep. 30, 2014
Debt Instrument [Line Items]
Conversion of subordinated convertible debt			$ 0	$ 0	$ 6,145,000
One-time charge in relation to the conversion of the notes			2,700,000
Interest expense			154,000
Write off of deferred debt issuance cost			293,000
Revolving credit facility
Debt Instrument [Line Items]
Credit facility, remaining borrowing capacity			2,300,000
Unsecured convertible notes | Common stock
Debt Instrument [Line Items]
Conversion of subordinated convertible debt	$ 6,150,000
Debt conversion, converted instrument, number of shares issued	2,671,739
Unsecured promissory note - Quercus Trust
Debt Instrument [Line Items]
Unsecured promissory note - Quercus Trust		$ 70,000
Credit facility, commitment fee percentage		1.00%
Single payment to cancel note and accrued interest			13,000
Accrued interest			5,000
Unsecured promissory note - Quercus Trust | Other income
Debt Instrument [Line Items]
Gains on cancellation of debt			$ 62,000
Convertible debt
Debt Instrument [Line Items]
Debt conversion, converted instrument, additional interest rate						5.00%

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The rate of additional interest payments as consideration for note conversion.

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The value of the financial instrument(s) that the original debt is being converted into in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

+ References

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The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period.

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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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Fair value amount of debt instrument that was repurchased.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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