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Summary of Significant Accounting Policies - Additional Information (Detail)
shares in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2015
USD ($)
Customer
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
Customer
Segment
Jun. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
Customer
Nov. 30, 2010
shares
Aug. 31, 2009
shares
Summary Of Significant Accounting Policies [Line Items]              
Reserves for uncollectible accounts $ 0   $ 0   $ 0    
Number of major customers representing outstanding trade receivables | Customer 2   2   1    
Life of inventory     2 years        
Protracted length of inventory     1 year        
Inventory valuation reserves $ 400,000   $ 400,000   $ 100,000    
Capitalized costs for enhancement of enterprise resource planning software system and other internal use software 0 $ 1,200,000 $ 0 $ 1,200,000      
Estimated useful life of intangible assets     10 years        
Number of reportable segments | Segment     1        
Impairment charges on long-lived assets 0 0 $ 0 0      
Period of warranty     1 year        
Warranty claim liability $ 0   $ 0   $ 0    
Computer Software, Intangible Asset              
Summary Of Significant Accounting Policies [Line Items]              
Enterprise resource planning system, estimated useful life     5 years        
2009 Unit Offering              
Summary Of Significant Accounting Policies [Line Items]              
Warrants to purchase an aggregate shares of common stock | shares             2.4
2010 Unit Offering              
Summary Of Significant Accounting Policies [Line Items]              
Warrants to purchase an aggregate shares of common stock | shares           3.7  
Other income, net              
Summary Of Significant Accounting Policies [Line Items]              
Reclassified amortization of premium from purchase of fixed income securities   $ 100,000   $ 300,000      
Earliest Tax Year              
Summary Of Significant Accounting Policies [Line Items]              
Tax year remain subject to examination     2010        
Latest Tax Year              
Summary Of Significant Accounting Policies [Line Items]              
Tax year remain subject to examination     2014        
Trade Accounts Receivable | Customer Concentration Risk              
Summary Of Significant Accounting Policies [Line Items]              
Concentration risk, percentage     43.00%   36.00%    
Minimum              
Summary Of Significant Accounting Policies [Line Items]              
Estimated useful life of property and equipment     3 years        
Maximum              
Summary Of Significant Accounting Policies [Line Items]              
Estimated useful life of property and equipment     5 years