The per share price that the individual must pay to acquire shares under the deferred compensation arrangement.

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The total fair value of shares issued during the period under a deferred compensation arrangement.

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Number of shares issued pursuant to the terms of a deferred compensation arrangement.

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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Number of options outstanding, including both vested and non-vested options.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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No definition available.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Stock-based compensation (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
	Mar. 30, 2018	Mar. 31, 2018	Mar. 31, 2017
Number of Stock Options [Roll Forward]
Stock-based compensation expense		$ 19	$ 52
Unrecognized compensation expense		$ 1,034
Unrecognized compensation expense, weighted average period		1 year 8 months 12 days
Stock Options [Member]
Number of Stock Options [Roll Forward]
Stock based compensation options outstanding (in shares)		2,208,781
Stock based compensation weighted average exercise price (in dollars per share)		$ 2.38
Stock based compensation vested (in shares)		538,029
Stock based compensation exercisable (in shares)		538,029
Stock Options [Member] \| March 30, 2018 [Member] \| Interim Chief Executive Officer [Member]
Number of Stock Options [Roll Forward]
Shares issued (in shares)	1,557,628
Purchase price (in dollars per share)	$ 1.12
Term of vesting	3 years
Expiry period of option	10 years
Aggregate fair value of shares issued	$ 950