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Summary of Significant Accounting Policies (Details)
$ in Thousands
12 Months Ended
Apr. 24, 2014
Dec. 31, 2015
USD ($)
item
Dec. 31, 2014
USD ($)
Summary of Significant Accounting Policies      
Reverse stock-split ratio 2.28    
Number of operating segment | item   1  
Number of geographic segment | item   1  
Marketable Securities      
Other-than-temporary impairment losses   $ 0  
Realized gains or losses on the sale of securities   0 $ 0
Inventories      
Capitalized inventories   0 $ 0
Impairment of Long-Lived Assets      
Impairment charges   $ 0  
Stock-Based Compensation      
Expected dividend yield (as a percent)   0.00%