Annual report pursuant to Section 13 and 15(d)

Indebtedness (Detail)

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Indebtedness (Detail) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2015
Jun. 30, 2018
Dec. 31, 2018
Debt Instrument [Line Items]      
2019     $ 9,936
2020     9,936
2021     6,354
2022     5,160
2023     2,150
Capital Leases, Future Minimum Payments Due     33,536
Equipment Financing Lease | Laboratory equipment      
Debt Instrument [Line Items]      
Amount financed $ 400,000    
Interest rate (as a percent) 6.44%    
Term of financing 36 months    
Equipment Financing Lease | Minimum [Member] | Office Equipment      
Debt Instrument [Line Items]      
Amount financed   $ 37,000  
Interest rate (as a percent)   4.15%  
Term of financing   36 months  
Equipment Financing Lease | Maximum | Office Equipment      
Debt Instrument [Line Items]      
Term of financing   60 months  
Principal and interest payments made during the period     52,000
Interest payments made during the period     2,000
Principal amount outstanding     $ 31,000