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Description of Business and Summary of Significant Accounting Policies - Additional Information (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Organization, Consolidation and Presentation of Financial Statements [Abstract]        
Cash held in bank accounts $ 91,905,000us-gaap_CashAndCashEquivalentsAtCarryingValue $ 20,793,000us-gaap_CashAndCashEquivalentsAtCarryingValue $ 23,867,000us-gaap_CashAndCashEquivalentsAtCarryingValue $ 19,048,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Inventory write-down 2,200,000us-gaap_InventoryWriteDown 2,600,000us-gaap_InventoryWriteDown 3,300,000us-gaap_InventoryWriteDown  
Capitalized deferred offering costs   $ 2,400,000us-gaap_DeferredOfferingCosts