Annual report pursuant to Section 13 and 15(d)

Schedule II - Valuation and Qualifying Accounts Schedule II - Valuation and Qualifying Accounts (Details)

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Schedule II - Valuation and Qualifying Accounts Schedule II - Valuation and Qualifying Accounts (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Allowance for Doubtful Accounts [Member]
      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Valuation Allowances and Reserves, Beginning Balance $ 132 $ 0 $ 0
Valuation Allowances and Reserves, Deductions (75) 0 0
Valuation Allowances and Reserves, Charged to Cost and Expense 0 132 0
Valuation Allowances and Reserves, Ending Balance 57 132 0
Inventory Valuation Reserve [Member]
      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Valuation Allowances and Reserves, Beginning Balance 152 117 148
Valuation Allowances and Reserves, Deductions (152) (92) (92)
Valuation Allowances and Reserves, Charged to Cost and Expense 533 127 61
Valuation Allowances and Reserves, Ending Balance 533 152 117
Valuation Allowance of Deferred Tax Assets [Member]
      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Valuation Allowances and Reserves, Beginning Balance 22,243 16,029 3,132
Valuation Allowances and Reserves, Deductions 0 0 0
Valuation Allowances and Reserves, Charged to Cost and Expense 6,385 6,214 12,897
Valuation Allowances and Reserves, Ending Balance $ 28,628 $ 22,243 $ 16,029