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Earnings Per Share - Earnings Per Basic and Diluted Share Table (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Numerator
Net loss	$ (4,446)us-gaap_NetIncomeLoss	$ (8,832)us-gaap_NetIncomeLoss	$ (17,415)us-gaap_NetIncomeLoss	$ (8,981)us-gaap_NetIncomeLoss	$ (21,306)us-gaap_NetIncomeLoss	$ (5,093)us-gaap_NetIncomeLoss	$ (7,892)us-gaap_NetIncomeLoss	$ (9,122)us-gaap_NetIncomeLoss	$ (39,674)us-gaap_NetIncomeLoss	$ (43,413)us-gaap_NetIncomeLoss	$ (89,266)us-gaap_NetIncomeLoss
Denominator
Weighted-average common shares outstanding (in shares)									37,959us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted	33,948us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted	32,852us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted
Basic and diluted net loss per share (dollars per share)					$ (0.63)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.15)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.23)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.27)us-gaap_EarningsPerShareBasicAndDiluted	$ (1.05)us-gaap_EarningsPerShareBasicAndDiluted	$ (1.28)us-gaap_EarningsPerShareBasicAndDiluted	$ (2.72)us-gaap_EarningsPerShareBasicAndDiluted

X

- Definition

The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Average number of shares or units issued and outstanding that are used in calculating basic and diluted earnings per share (EPS).

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