Quarterly report pursuant to Section 13 or 15(d)

Convertible Debt (Details)

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Convertible Debt (Details) - Convertible Debt [Member] - Convertible Senior Notes Due 2020 [Member] - USD ($)
3 Months Ended 9 Months Ended
Jun. 29, 2015
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Debt Instrument [Line Items]            
Aggregate principal amount $ 115,000,000          
Coupon rate 7.00%          
Amount of underwriter's discount $ 3,700,000          
Amortization of discount   $ 192,000   $ 192,000    
Deferred debt issuance costs, net   179,000   179,000   $ 0
Interest expense   $ 9,000 $ 0 $ 9,000 $ 0  
Conversion rate, principal amount of convertible note $ 1,000          
Percentage of principal amount redeemed 100.00%          
Common Stock [Member]            
Debt Instrument [Line Items]            
Conversion rate, number of common stock (in shares) 151.5152          
Conversion price per share of common stock $ 6.60