The total fair value of shares issued during the period under 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 grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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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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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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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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Gross number of share options (or share units) granted during the period.

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

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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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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Intrinsic value of equity-based compensation awards vested. Excludes stock and unit options.

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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		6 Months Ended
	Jun. 06, 2018	May 23, 2018	Mar. 30, 2018	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Additional General Disclosures [Abstract]
Stock-based compensation expense				$ 184	$ 21	$ 203	$ 73
Compensation Cost Not yet Recognized [Abstract]
Unrecognized compensation expense				$ 3,194		$ 3,194
Unrecognized compensation expense, weighted average period						1 year 6 months
Stock Options [Member]
Number of Stock Options [Abstract]
Options outstanding (in shares)				4,236,264		4,236,264
Weighted average exercise price (in dollars per share)				$ 2.06		$ 2.06
Vested (in shares)				684,090		684,090
Exercisable (in shares)				684,090		684,090
Number of shares available for issuance (in shares)				1,151,021		1,151,021
Stock Options [Member] \| March 30, 2018 [Member] \| Interim Chief Executive Officer [Member]
Number of Stock Options [Abstract]
Granted (in shares)			1,557,628
Strike price (in dollars per share)			$ 1.12
Additional General Disclosures [Abstract]
Term of vesting			3 years
Expiration period			10 years
Aggregate fair value of shares issued			$ 950
Stock Options [Member] \| May 23, 2018 [Member] \| Interim Chief Executive Officer [Member]
Number of Stock Options [Abstract]
Granted (in shares)		1,413,249
Strike price (in dollars per share)		$ 1.66
Additional General Disclosures [Abstract]
Term of vesting		3 years
Expiration period		10 years
Aggregate fair value of shares issued		$ 1,110
Stock Options [Member] \| May 29, 2018 [Member] \| Management [Member]
Number of Stock Options [Abstract]
Granted (in shares)				800,000
Additional General Disclosures [Abstract]
Term of vesting				3 years
Expiration period				10 years
Aggregate fair value of shares issued				$ 801
Stock Options [Member] \| May 29, 2018 [Member] \| Management [Member] \| Minimum [Member]
Number of Stock Options [Abstract]
Strike price (in dollars per share)				$ 1.66
Stock Options [Member] \| May 29, 2018 [Member] \| Management [Member] \| Maximum [Member]
Number of Stock Options [Abstract]
Strike price (in dollars per share)				$ 1.93
Restricted Stock Units [Member] \| June 6, 2018 [Member] \| New Members of the Board of Directors [Member]
Additional General Disclosures [Abstract]
Term of vesting	12 months
Expiration period	10 years
Restricted Stock Units [Abstract]
Granted (in shares)	140,097
Strike price (in dollars per share)	$ 2.07
Aggregate grant date fair value	$ 290