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Stock-based Compensation - Option Valuation Method (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Weighted average value of options granted in period (in dollars per share)	$ 2.57	$ 4.79	$ 6.24
Aggregate fair value of options	$ 1,279	$ 4,217	$ 3,249
Expected dividend yield	0.00%	0.00%	0.00%
Expected dividend yield, non-employees directors	0.00%	0.00%	0.00%
Weighted average expected volatility	67.18%	64.42%	68.57%
Weighted average expected volatility, non-employees directors	67.61%	63.46%	64.10%
Weighted average risk-free interest rate	1.48%	1.60%	2.05%
Weighted average risk-free interest rate, non-employees directors	1.41%	1.62%	1.75%
Weighted average expected term (in years)	6 years 29 days	6 years 26 days	6 years 15 days
Weighted average expected term (in years), non-employees directors	5 years 3 months 18 days	5 years 3 months 26 days	5 years 3 months 17 days
Forfeiture rate	5.00%	5.00%	5.00%
Forfeiture rate, non-employees directors	5.00%	5.00%	5.00%

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Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Forfeiture Rate

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(iii)
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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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Weighted average expected volatility rate of share-based compensation awards.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the expected term of a nonvested share or option award issued to other than an employee.

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Period an equity-based award is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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