Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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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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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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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 number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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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 weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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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 number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Percentage of vesting of share-based compensation awards.

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Common Stock, warrants, stock-based compensation, stock options, restricted stock and restricted stock units - Restricted stock (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended		12 Months Ended
	Jan. 31, 2015	Dec. 31, 2014	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Weighted-average grant date fair value per share
Share-based compensation expense			$ 4,884	$ 2,168	$ 928
Restricted stock
Number of restricted stock
Unvested restricted common stock at the beginning of the period (in shares)			177,192	376,248	623,869
Granted (in shares)			0	0
Vested (in shares)			(137,386)	(199,056)	(247,621)
Unvested restricted common stock at the end of the period (in shares)			39,806	177,192	376,248
Weighted-average grant date fair value per share
Unvested restricted common stock at the beginning of the period (in dollars per share)			$ 3.11	$ 3.12	$ 3.12
Vested (in dollars per share)			3.11	3.12	3.09
Unvested restricted common stock at the end of the period (in dollars per share)			$ 3.12	$ 3.11	$ 3.12
Share-based compensation expense			$ 400	$ 600	$ 700
Total unrecognized compensation cost related to unvested stock awards			$ 0
Period of recognition of unrecognized compensation cost			0 years
Aggregate fair value of restricted stock awards			$ 2,400	$ 1,900	$ 1,100
2007 Plan \| Restricted stock \| Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)		4 years
Number of restricted stock
Granted (in shares)		78,912
2007 Plan \| Restricted stock \| Executive
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)			4 years
Number of restricted stock
Granted (in shares)	781,060
2007 Plan \| Restricted stock \| Executive \| Subject to a four year vesting schedule with 25% vesting on the first anniversary and the remaining vesting ratably on a monthly basis over the remaining three years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage 1 (as a percent)	25.00%
2007 Plan \| Restricted stock \| Executive \| Subject to vesting with 50% vesting on December 31, 2018 and December 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)			3 years
Vesting percentage 1 (as a percent)	75.00%