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Equipment Loan Payable - Additional Information (Detail) - USD ($)
1 Months Ended
Jul. 31, 2014
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Class of Warrant or Right [Line Items]        
Net exercise of warrants, shares   156,138   156,138
Net exercise of warrants, exercise price per share   $ 0.01   $ 0.01
Silicon Valley Bank [Member]        
Class of Warrant or Right [Line Items]        
Amount of loan to purchase equipment $ 1,750,000      
Line of credit facility, interest rate, stated percentage 3.25%      
Bank loan and security agreement, repayment period 36 months      
Net exercise of warrants, shares 6,566 6,566    
Net exercise of warrants, exercise price per share $ 7.99 $ 7.99    
Borrowings outstanding under line of credit   $ 1,200,000 $ 1,340,000  
Silicon Valley Bank [Member] | Prime Rate [Member]        
Class of Warrant or Right [Line Items]        
Amount of loan bears interest basis spread on variable rate 2.75%