XML 70 R47.htm IDEA: XBRL DOCUMENT v3.10.0.1
Redeemable Convertible Preferred Shares - Additional Information (Detail)
 1 Months Ended 3 Months Ended 12 Months Ended
Oct. 20, 2017
Jul. 31, 2017
USD ($)
$ / shares
shares
Jun. 30, 2017
$ / shares
shares
Mar. 31, 2017
USD ($)
$ / shares
shares
Jul. 31, 2017
USD ($)
$ / shares
shares
Jun. 30, 2017
$ / shares
shares
Mar. 31, 2017
USD ($)
$ / shares
shares
Feb. 29, 2016
USD ($)
$ / shares
shares
Jul. 01, 2015
USD ($)
$ / shares
shares
Jun. 30, 2015
USD ($)
$ / shares
shares
Jan. 31, 2015
USD ($)
$ / shares
shares
Mar. 31, 2017
USD ($)
$ / shares
Dec. 31, 2017
USD ($)
Installment
$ / shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Class of Stock [Line Items]                              
Conversion of bridge units in to preferred units                       $ 8,500,000 $ 8,500,000   $ 8,000,000
Payment of offering costs                         3,574,000    
Fair value of tranche right                           $ 909,000 $ 2,401,000
Share conversion ratio     1     1                  
Proceeds from issuance of preferred units                         $ 50,000,000    
Percentage of voting to be held by holders of senior preferred stock for deemed liquidation event                         60.00%    
Preferred stock dividend rate                         8.00%    
Dividends paid | $ / shares                         $ 0 $ 0  
Dividends declared | $ / shares                         $ 0 0  
Redemption date of redeemable preferred stock                         Feb. 01, 2021    
Number of annual installments for redemption | Installment                         3    
Preferred stock notice period for redemption                         60 days    
Common Stock [Member]                              
Class of Stock [Line Items]                              
Reverse stock split ratio 0.164544                            
Reverse stock split One-for-6.0774                            
2015 Bridge Units [Member]                              
Class of Stock [Line Items]                              
Bridge units issued and sold | shares                     8,000        
Bridge units issued price per unit | $ / shares                     $ 1,000        
Conversion of bridge units in to preferred units                     $ 8,000,000        
Redeemable issuer option value                     $ 2,300,000        
2015 Bridge Units [Member] | Minimum [Member]                              
Class of Stock [Line Items]                              
Bridge units discount percentage                     20.00%        
2015 Bridge Units [Member] | Maximum [Member]                              
Class of Stock [Line Items]                              
Bridge units discount percentage                     25.00%        
Class A Preferred Unit [Member]                              
Class of Stock [Line Items]                              
Redeemable convertible shares, par value | $ / shares                   $ 3.90         $ 4.40
Conversion of bridge units in to preferred units                 $ 8,000,000            
Redeemable issuer option value                 $ 900,000            
Redeemable convertible shares issued and sold | shares                 2,279,202 1,923,076         3,295,455
Proceeds from issuance of preferred units, net of issuance costs                   $ 7,300,000         $ 14,500,000
Payment of offering costs                   $ 200,000          
Preferred units discount percentage                 10.00% 20.00%          
Conversion price of redeemable preferred share | $ / shares                 $ 3.51 $ 3.90          
Convertible debt fair value disclosures                 $ 8,900,000            
Liability fair value adjustment                 8,000,000            
Gain on extinguishment                 $ 0            
Fair value of tranche right                             2,400,000
Class B Preferred Unit [Member]                              
Class of Stock [Line Items]                              
Redeemable convertible shares, par value | $ / shares               $ 4.40           $ 5.28  
Redeemable convertible shares issued and sold | shares               5,909,089           1,609,846  
Proceeds from issuance of preferred units, net of issuance costs               $ 25,900,000           $ 8,500,000  
Payment of offering costs               $ 100,000              
Fair value of tranche right                           $ 900,000  
2016 Bridge Units [Member]                              
Class of Stock [Line Items]                              
Bridge units issued and sold | shares                           8,500  
Bridge units issued price per unit | $ / shares                           $ 1,000  
Conversion of bridge units in to preferred units                           $ 8,500,000  
Bridge units discount percentage                           10.00%  
Redeemable issuer option value                           $ 900,000  
Change in fair value                           300,000  
Class C Preferred Units [Member]                              
Class of Stock [Line Items]                              
Redeemable convertible shares, par value | $ / shares       $ 1.7749     $ 1.7749         $ 1.7749      
Conversion of bridge units in to preferred units                           8,500,000  
Redeemable issuer option value                           $ 900,000  
Redeemable convertible shares issued and sold | shares       24,326,470     24,326,470             5,321,112  
Proceeds from issuance of preferred units, net of issuance costs       $ 43,000,000     $ 43,000,000                
Payment of offering costs       $ 200,000     $ 200,000                
Preferred units discount percentage                           10.00%  
Conversion price of redeemable preferred share | $ / shares                           $ 1.60  
Convertible debt fair value disclosures                           $ 9,400,000  
Liability fair value adjustment                           8,500,000  
Gain on extinguishment                           $ 0  
Class C Preferred Units [Member] | Chief Financial Officer [Member]                              
Class of Stock [Line Items]                              
Redeemable convertible shares, par value | $ / shares   $ 1.7749     $ 1.7749                    
Redeemable convertible shares issued and sold | shares   61,880     61,880                    
Proceeds from issuance of preferred units, net of issuance costs   $ 100,000     $ 100,000                    
Redeemable Convertible Preferred Shares [Member]                              
Class of Stock [Line Items]                              
Redeemable convertible shares, authorized | shares     43,297,267     43,297,267               43,297,267  
Redeemable convertible shares, par value | $ / shares     $ 0.001     $ 0.001               $ 0.001  
Junior Preferred Stock [Member]                              
Class of Stock [Line Items]                              
Conversion price of redeemable preferred share | $ / shares                         $ 6.0774    
Original issue price, per share | $ / shares                         $ 1.00    
Preferred stock dividend rate                         5.00%    
Class A Preferred Unit [Member]                              
Class of Stock [Line Items]                              
Payment of offering costs                             170,000
Conversion price of redeemable preferred share | $ / shares   $ 15.5654 15.5715   $ 15.5654 15.5715             $ 23.7019    
Fair value of tranche right                             $ 1,100,000
Original issue price, per share | $ / shares                         3.90    
Class B Preferred Unit [Member]                              
Class of Stock [Line Items]                              
Conversion price of redeemable preferred share | $ / shares   $ 16.7177 $ 16.7256   $ 16.7177 $ 16.7256             26.7406    
Original issue price, per share | $ / shares                         4.40    
Class C Preferred Units [Member]                              
Class of Stock [Line Items]                              
Conversion price of redeemable preferred share | $ / shares                         10.7868    
Original issue price, per share | $ / shares                         $ 1.7749