Stockholders' Equity, Restricted Stock Units (Details) (Restricted Stock Units ("RSUs") [Member], USD $)	3 Months Ended	12 Months Ended
Mar. 31, 2015	Dec. 31, 2014
Restricted stock units, number of shares [Roll Forward]
Outstanding RSUs, beginning of period (in shares)	1,463,834
Awarded (in shares)	116,950
Released (in shares)	(80,445)
Forfeited (in shares)	(130,308)
Outstanding RSUs, end of period (in shares)	1,370,031	1,463,834
Restricted stock units, weighted average grant-date fair value [Roll forward]
Outstanding RSUs, beginning of period (in dollars per share)	$ 3.51
Awarded (in dollars per share)	$ 1.86
Released (in dollars per share)	$ 3.27
Forfeited (in dollars per share)	$ 3.43
Outstanding RSUs, end of period (in dollars per share)	$ 3.40	$ 3.51
Restricted stock units, additional disclosures [Abstract]
Outstanding RSUs, weighted average remaining contractual term	1 year 5 months 12 days	1 year 6 months 22 days
Outstanding RSUs, aggregate intrinsic value	$ 2,137,000	$ 3,067,000
Compensation cost not yet recognized [Abstract]
Unrecognized compensation cost related to restricted stock units	$ 3,100,000
Weighted average period of recognition for unrecognized compensation cost	2 years 6 months
President and Chief Executive Officer [Member]
Restricted stock units, number of shares [Roll Forward]
Awarded (in shares)	218,752
Restricted stock units, additional disclosures [Abstract]
Vesting period	4 years
Percentage of the awards annual vesting tranches (in hundredths)	25.00%
Non-employee Directors [Member]
Restricted stock units, number of shares [Roll Forward]
Awarded (in shares)	108,225
Restricted stock units, additional disclosures [Abstract]
Vesting period	1 year

Percentage of equal annual vesting tranches becoming vested on each of the first four anniversaries.

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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.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (i)

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

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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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-Publisher FASB

-Name Accounting Standards Codification

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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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- Definition

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.

+ References

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-Publisher FASB

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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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Weighted average remaining contractual term for equity-based awards excluding options, 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 equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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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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