Quarterly report pursuant to Section 13 or 15(d)

Capital Stock - Additional Information (Details)

v3.10.0.1
Capital Stock - Additional Information (Details) - USD ($)
1 Months Ended 9 Months Ended
Jun. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Class Of Stock [Line Items]        
Reclassification of convertible preferred stock warrant liability into additional paid-in capital $ 5,700,000   $ 5,711,000  
Preferred stock, shares outstanding   0   0
Common stock, shares authorized   500,000,000    
Common stock, par value   $ 0.005    
Common stock, voting rights   each outstanding share of common stock is entitled to one vote    
Common stock, shares issued   10,803,710   9,827,129
Common stock, shares outstanding   10,803,710   9,827,129
Preferred stock, shares authorized   20,000,000    
Preferred stock, par value   $ 0.005    
Preferred stock, shares issued   0   0
Convertible Preferred Stock        
Class Of Stock [Line Items]        
Preferred stock, shares outstanding   0    
Common Stock        
Class Of Stock [Line Items]        
Conversion of preferred stock into common stock, shares 4,689,753 4,689,753    
Conversion of preferred stock into common stock, value   $ 23,000    
Additional Paid-in Capital        
Class Of Stock [Line Items]        
Reclassification of convertible preferred stock warrant liability into additional paid-in capital $ 42,100,000 $ 42,100,000