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Organization and Description of Business - Additional Information (Detail)
$ / shares in Units, $ in Thousands
 12 Months Ended
Mar. 15, 2017
USD ($)
Aug. 13, 2014
shares
Jul. 22, 2014
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
Segment
$ / shares
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Dec. 31, 2014
USD ($)
shares
Apr. 18, 2017
$ / d
Jul. 01, 2014
shares
Dec. 31, 2013
USD ($)
Schedule of Capitalization, Equity [Line Items]                  
Number of reportable segments | Segment       2          
Accumulated deficit       $ 212,553 $ 173,084        
Cash and cash equivalents       17,258 29,888 $ 36,431     $ 5,128
Debt outstanding under debt and capital lease obligations       24,000          
Proceeds from debt, net of issuance costs       $ 0 $ 15,625 0      
Reverse stock split       1 for 6.85          
Reverse stock split, ratio       0.145985401          
Reverse Stock Split effective date       Jul. 14, 2014          
Common stock, shares authorized | shares     100,000,000 100,000,000 100,000,000     10,000,000  
Common stock, par value | $ / shares     $ 0.001 $ 0.001 $ 0.001        
Preferred stock, shares authorized | shares     10,000,000 10,000,000 10,000,000        
Preferred stock, par value | $ / shares     $ 0.001 $ 0.001 $ 0.001        
Underwriting discounts and commissions       $ 0 $ 0 3,733      
Proceeds from initial public offering net of underwriting discounts and commissions       0 $ 0 $ 39,246      
Convertible note principal amount       $ 5          
Common Stock [Member]                  
Schedule of Capitalization, Equity [Line Items]                  
Common stock shares issued | shares           510,777      
Shares issued upon conversion | shares     6,048,220 4,630,145          
Convertible note principal amount       $ 5          
IPO [Member]                  
Schedule of Capitalization, Equity [Line Items]                  
Common stock shares issued | shares     4,000,000            
Common stock offer price per share | $ / shares     $ 10.00            
Underwriting discounts and commissions     $ 3,000            
Proceeds from initial public offering net of underwriting discounts and commissions     39,200            
Offering expenses     3,700            
Net proceeds from issuance of initial public offering     $ 35,500            
Over-Allotment Option [Member]                  
Schedule of Capitalization, Equity [Line Items]                  
Common stock shares issued | shares   220,000              
Convertible Subordinated Debt [Member]                  
Schedule of Capitalization, Equity [Line Items]                  
Shares issued upon conversion | shares     510,777            
Convertible note principal amount     $ 5,000            
Subsequent Event [Member] | JGB Debt [Member]                  
Schedule of Capitalization, Equity [Line Items]                  
Proceeds from debt, net of issuance costs $ 24,000                
Pay-off of term debt 11,200                
Minimum cash requirement $ 9,400                
Accruing liquidated damages payable amount per day | $ / d             7,000