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COMMON STOCK AND STOCK INCENTIVE PLANS - Unvested Restricted Awards (Details) $ / shares in Units, shares in Thousands, $ in Millions		12 Months Ended
	Jul. 21, 2006	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2016 USD ($) $ / shares shares	Dec. 31, 2015 USD ($) $ / shares shares
2017 Equity Incentive Plan
Restricted stock awards
Vesting period		4 years
2017 Equity Incentive Plan | Restricted Stock
Restricted stock awards
Vesting period		4 years
Ratio for grant of stock awards that is deducted from the shares available for grant		1
Shares
Total nonvested restricted stock at the beginning of the period (in shares) | shares		1,438
Granted (in shares) | shares		76
Vested (in shares) | shares		(364)
Forfeited (in shares) | shares		(229)
Total nonvested restricted stock at the end of the period (in shares) | shares		921	1,438
Weighted average grant date fair value
Total nonvested restricted stock at the beginning of the period (in dollars per share) | $ / shares		$ 2.28
Granted (in dollars per share) | $ / shares		2.34
Vested (in dollars per share) | $ / shares		2.27
Forfeited (in dollars per share) | $ / shares		3.64
Total nonvested restricted stock at the end of the period (in dollars per share) | $ / shares		$ 1.96	$ 2.28
Fair value of restricted stock awards vested | $		$ 0.8
2017 Equity Incentive Plan | Restricted Stock | Maximum
Restricted stock awards
Vesting period		4 years
2006 Equity Incentive Plan
Restricted stock awards
Vesting period	4 years
2006 Equity Incentive Plan | Restricted Stock
Shares
Total nonvested restricted stock at the beginning of the period (in shares) | shares		1,438	1,056	1,481
Granted (in shares) | shares			1,124	422
Vested (in shares) | shares			(624)	(427)
Forfeited (in shares) | shares			(118)	(420)
Total nonvested restricted stock at the end of the period (in shares) | shares			1,438	1,056
Weighted average grant date fair value
Total nonvested restricted stock at the beginning of the period (in dollars per share) | $ / shares		$ 2.28	$ 2.72	$ 2.90
Granted (in dollars per share) | $ / shares			2.19	2.47
Vested (in dollars per share) | $ / shares			2.77	3.07
Forfeited (in dollars per share) | $ / shares			2.70	2.76
Total nonvested restricted stock at the end of the period (in dollars per share) | $ / shares			$ 2.28	$ 2.72
Fair value of restricted stock awards vested | $			$ 1.7	$ 1.3

X

- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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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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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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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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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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Represents the ratio for grant of stock awards that is deducted from the shares available for grant.

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