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Common Stock - Additional Information (Detail) - USD ($)
1 Months Ended 3 Months Ended
Feb. 03, 2017
Jan. 27, 2017
Feb. 28, 2017
Mar. 31, 2017
Mar. 17, 2017
Dec. 31, 2016
Temporary Equity [Line Items]            
Proceeds from stock subscriptions       $ 108,000   $ 206,000
Registered Direct Offering [Member]            
Temporary Equity [Line Items]            
Payment of commissions and other issuance cost     $ 727,000      
Proceeds from sale of common stock     $ 7,598,000      
Registered Direct Offering [Member] | Securities Purchase Agreement [Member]            
Temporary Equity [Line Items]            
Sale of stock, number of shares sold in transaction 950,000 2,000,000        
Sale of stock, price per share $ 3.50 $ 2.50        
At the Market Offering [Member] | BTIG LLC [Member]            
Temporary Equity [Line Items]            
Sale of stock, number of shares sold in transaction       538,427    
Proceeds from sale of common stock       $ 2,104,000    
Fixed commission rate entitled to placement agent       3.00%    
Average selling price of common stock       $ 4.04    
Gross proceeds from sale of shares       $ 2,175,000    
Proceeds from stock subscriptions       $ 108,000    
At the Market Offering [Member] | BTIG LLC [Member] | Maximum [Member]            
Temporary Equity [Line Items]            
Aggregate offering on sale of common stock         $ 11,000,000