Annual report pursuant to Section 13 and 15(d)

Computation of Net Loss from Continuing Operations per Share of Common Stock Antidilutive Shares Excluded From the Computation of Earnings Per Share (Details)

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Computation of Net Loss from Continuing Operations per Share of Common Stock Antidilutive Shares Excluded From the Computation of Earnings Per Share (Details) - shares
shares in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Stock options and restricted stock units      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 1,511 1,676 1,724