Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies - Development and Licensing Agreement - Additional Information (Detail)

v3.8.0.1
Commitments and Contingencies - Development and Licensing Agreement - Additional Information (Detail) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Commitments And Contingencies [Line Items]                          
Revenues     $ 29,135 $ 250,000 $ 299,506 $ 575,368 $ 129,786 $ 1,003,973 $ 181,818 $ 136,364 $ 1,154,009 $ 1,451,941 $ 2,500,000
Revenue recognition, milestone method, revenue recognized                     44,550 59,400  
Development and Licensing Agreements [Member]                          
Commitments And Contingencies [Line Items]                          
Licenses revenue   $ 500,000                      
Revenues                     108,959 391,041  
Revenue recognition, milestone method, revenue recognized                     $ 1,000,000 $ 1,000,000  
Development and Licensing Agreements [Member] | Revenues [Member] | Customer Concentration Risk [Member]                          
Commitments And Contingencies [Line Items]                          
Concentration percentage                     100.00% 100.00% 100.00%
Development and Licensing Agreements [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member]                          
Commitments And Contingencies [Line Items]                          
Concentration percentage 100.00%