Quarterly report pursuant to Section 13 or 15(d)

Common Stock - Additional Information (Detail)

v3.10.0.1
Common Stock - Additional Information (Detail)
3 Months Ended 6 Months Ended 10 Months Ended
May 23, 2018
$ / shares
shares
May 22, 2018
shares
Sep. 14, 2017
USD ($)
$ / shares
shares
Jun. 30, 2018
USD ($)
$ / shares
shares
Jun. 30, 2017
shares
Jun. 30, 2018
USD ($)
$ / shares
shares
Jun. 30, 2017
shares
Jun. 30, 2018
USD ($)
$ / shares
shares
Jun. 19, 2018
$ / shares
Dec. 31, 2017
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Common stock, shares authorized 150,000,000 75,000,000   150,000,000   150,000,000   150,000,000   150,000,000
Common stock, par value | $ / shares $ 0.001     $ 0.001   $ 0.001   $ 0.001   $ 0.001
Preferred stock, shares authorized       5,000,000   5,000,000   5,000,000   5,000,000
Preferred stock, par value | $ / shares       $ 0.001   $ 0.001   $ 0.001   $ 0.001
Reverse stock split ratio 0.1                  
Exercise price per unit of warrant | $ / shares                 $ 4.00  
Initial purchase of units consisting of common stock and warrants issued | $           $ 1,280,000        
Common stock, shares issued       4,238,526   4,238,526   4,238,526   1,195,675
Stock option exercises, Shares       0 0 0 0      
Restricted stock unit settlements       0 0 0 0      
Common shares reserved for options currently outstanding       111,185   111,185   111,185   111,578
Common shares reserved for awards currently outstanding         0   0      
Number of stock options granted       0 0 0 0      
Proceeds from warrants exercise | $           $ 428,000        
Number of warrants exercised         0   0      
Stock Options [Member] | Employees and Consultants [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Award vesting period           4 years        
Restricted Stock Unit [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Award vesting period           4 years        
Common shares reserved for awards currently outstanding       20,394   20,394   20,394   21,066
2017 Equity Incentive Plan [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Award expiration period           10 years        
2017 Equity Incentive Plan [Member] | Stock Options [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Common shares reserved for issuance under incentive plan       104,910   104,910   104,910    
2010 Performance Incentive Plan [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Award expiration period           10 years        
2010 Performance Incentive Plan [Member] | Stock Options [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Common shares reserved for issuance under incentive plan       26,317   26,317   26,317    
Common shares reserved for options currently outstanding       5,923   5,923   5,923    
2010 Performance Incentive Plan [Member] | Restricted Stock Unit [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Common shares reserved for awards currently outstanding       20,394   20,394   20,394    
Minimum [Member] | Stock Options [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Award expiration period           7 years        
Minimum [Member] | Stock Options [Member] | Board of Directors [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Award vesting period           1 year        
Minimum [Member] | 2017 Equity Incentive Plan [Member] | Employees and Consultants [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Award vesting period           3 years        
Minimum [Member] | 2017 Equity Incentive Plan [Member] | Board of Directors [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Award vesting period           1 year        
Minimum [Member] | 2010 Performance Incentive Plan [Member] | Employees and Consultants [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Award vesting period           3 years        
Minimum [Member] | 2010 Performance Incentive Plan [Member] | Board of Directors [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Award vesting period           1 year        
Maximum [Member] | Stock Options [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Award expiration period           10 years        
Maximum [Member] | Stock Options [Member] | Board of Directors [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Award vesting period           3 years        
Maximum [Member] | 2017 Equity Incentive Plan [Member] | Employees and Consultants [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Award vesting period           4 years        
Maximum [Member] | 2017 Equity Incentive Plan [Member] | Board of Directors [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Award vesting period           3 years        
Maximum [Member] | 2010 Performance Incentive Plan [Member] | Employees and Consultants [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Award vesting period           4 years        
Maximum [Member] | 2010 Performance Incentive Plan [Member] | Board of Directors [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Award vesting period           3 years        
Warrants Issued In June 2018 [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Exercise price per unit of warrant | $ / shares       $ 4.00   $ 4.00   $ 4.00    
Proceeds from warrants exercise | $       $ 500,000   $ 500,000        
Proceeds from warrants exercise receivable | $       $ 100,000   $ 100,000   $ 100,000    
Number of warrants exercised       130,500   130,500        
LPC [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Common stock, par value | $ / shares     $ 0.001              
Common stock value right to sell, maximum | $     $ 11,000,000              
Minimum percentage of common stock shares outstanding authorized to sell   20.00%                
Initial purchase of common stock               32,895    
Common stock, purchase price | $ / shares     $ 1.00              
Additional common stock value right to sell, maximum | $     $ 10,000,000              
Additional purchase of common stock, maximum     8,000              
Common stock, shares issued     12,352              
Gross proceeds | $     $ 0              
Common stock, shares issued               183,378    
Gross proceeds | $               $ 3,600,000    
Offering expenses | $               500,000    
Common stock available for sale under offering | $       $ 7,400,000   $ 7,400,000   $ 7,400,000    
LPC [Member] | Minimum [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Common stock, purchase price | $ / shares     $ 20.00              
LPC [Member] | Units [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Initial purchase of common stock     32,895              
Common stock, purchase price | $ / shares     $ 30.40              
Purchase agreement, description           Unit consisting of (a) one share of our Common Stock and (b) one warrant to purchase one-quarter of a share of Common Stock at an exercise price of $34.96 per share, or Warrant. Each Warrant is exercisable six months following the issuance date until the date that is five years and six months after the issuance date and is subject to customary adjustments.        
Exercise price per unit of warrant | $ / shares     $ 34.96              
Initial purchase of units consisting of common stock and warrants issued | $     $ 1,000,000              
LPC [Member] | Other Units [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Number of warrants issued     0