Annual report pursuant to Section 13 and 15(d)

Liquidity and Management Plans - Additional Information (Detail)

v3.10.0.1
Liquidity and Management Plans - Additional Information (Detail) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Feb. 27, 2019
Jan. 31, 2018
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Liquidity And Management Plans [Line Items]                        
Engineering product development     $ 56,050 $ 228,000 $ 205,773 $ 25,000 $ 29,135 $ 250,000 $ 299,506 $ 575,368 $ 514,823 $ 1,154,009
Net income (loss)     (12,453,003) $ (12,645,291) $ (12,298,371) $ (13,443,457) (11,236,477) $ (12,748,248) $ (12,919,010) $ (12,473,140) (50,840,122) (49,376,875)
Net cash provided by (used in) operating activities                     (32,527,023) (34,430,298)
Proceeds from issuance of common stock                     38,846,815  
Cash and cash equivalents, at carrying value, total     $ 20,106,485       $ 12,795,254       20,106,485 $ 12,795,254
Subsequent Event [Member]                        
Liquidity And Management Plans [Line Items]                        
Proceeds from issuance of common stock $ 23,300,000                      
Underwriters’ discount 1,500,000                      
Stock offering expenses on issue of common stock $ 200,000                      
At-the-Market [Member]                        
Liquidity And Management Plans [Line Items]                        
Proceeds from issuance of common stock   $ 38,846,815                    
Technology Service [Member]                        
Liquidity And Management Plans [Line Items]                        
Engineering product development                     $ 514,823