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Summary of Significant Accounting Policies Narrative (Details) (USD $)
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12 Months Ended | 0 Months Ended | 12 Months Ended | ||||||
|---|---|---|---|---|---|---|---|---|---|
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Dec. 31, 2013
segment
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Dec. 31, 2012
segment
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Dec. 31, 2011
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Dec. 31, 2013
Maximum [Member]
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Dec. 31, 2012
Equipment [Member]
Minimum [Member]
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Dec. 31, 2012
Equipment [Member]
Maximum [Member]
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Nov. 23, 2011
IPO [Member]
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Nov. 23, 2011
Stockholder [Member]
IPO [Member]
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Dec. 31, 2012
Patents [Member]
Maximum [Member]
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| Accounting Policies [Abstract] | |||||||||
| Accumulated deficit | $ (110,124,000) | $ (101,305,000) | |||||||
| Shares of common stock sold and issued | 5,681,796 | 3,968,204 | |||||||
| Sale of Stock, Price Per Share | $ 10.00 | ||||||||
| Proceeds From Issuance Initial Public Offering, Gross | 56,800,000 | ||||||||
| Proceeds from initial public offering, net of expenses | 0 | 0 | 49,217,000 | 49,200,000 | |||||
| Payments of Underwriting Discounts and Commissions | 4,000,000 | ||||||||
| Payments of Other Offering Costs | 3,600,000 | ||||||||
| Inventory, Net [Abstract] | |||||||||
| Inventory raw materials noncurrent | 6,500,000 | 2,400,000 | |||||||
| Inventory work in process noncurrent | 0 | 800,000 | |||||||
| Inventory Write-down | 1,000,000 | ||||||||
| Property, Plant and Equipment, Useful Life | 3 years | 5 years | |||||||
| Finite-Lived Intangible Asset, Useful Life | 20 years | 20 years | |||||||
| Impairment of Long-Lived Assets | |||||||||
| Asset impairment charges | $ 0 | $ 949,000 | $ 0 | ||||||
| Number of Reportable Segments | 1 | 1 | |||||||