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Stockholders' Equity and Stock-Based Compensation Nonemployee Director Restricted Stock and Restricted Stock Unit Awards (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Mar. 09, 2006
Director Restricted Stock Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock available for grant per employee	$ 90	$ 60
Repurchase price per share		$ 0.01
Restricted stock subject to restrictions percent		100.00%
Director Restricted Stock Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Based Compensation Arrangement By Share Based Payment Award Award Termination Period	10 years

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- Definition

Restricted Stock, Repurchase Price Per Share

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Share-based Compensation Arrangement by Share-based Payment Award, Stock Available for Grant per each employee.

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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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