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Description of Business and Summary of Significant Accounting Policies (Details 7) (USD $)
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1 Months Ended | 12 Months Ended | ||
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Dec. 31, 2012
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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| Changes in the allowance for doubtful accounts | ||||
| Allowance for Doubtful Accounts Receivable, Beginning Balance | $ 605,000 | $ 643,000 | $ 651,000 | |
| Provision | 229,000 | 159,000 | 184,000 | |
| Deductions | (129,000) | (197,000) | (192,000) | |
| Allowance for Doubtful Accounts Receivable, Ending Balance | 643,000 | 705,000 | 605,000 | 643,000 |
| Inventories | ||||
| Inventory write-downs | 1,700,000 | 2,300,000 | 1,500,000 | |
| Loss (gain) on inventory purchase commitment | $ 1,800,000 | $ (380,000) | $ 1,840,000 | |