License Agreements, Research Collaborations and Development Agreements - Additional Information (Details)	3 Months Ended
Mar. 31, 2019 USD ($) Agreement	Mar. 31, 2018 USD ($)
License Agreements Research Collaborations And Development Agreements [Line Items]
Revenue from contract	$ 1,020,177	$ 846,226
Royalty expense	62,500	62,500
Annual future minimum royalty payments due	250,000
Collaborations Revenue [Member]
License Agreements Research Collaborations And Development Agreements [Line Items]
Revenue from contract	$ 500,000	$ 204,040
FISH Product Line [Member]
License Agreements Research Collaborations And Development Agreements [Line Items]
Number of license agreements \| Agreement	1
New York State Department of Health and ILÚM Health Solutions, LLC [Member]
License Agreements Research Collaborations And Development Agreements [Line Items]
Payment received related to contract	$ 1,600,000
Contractual agreement period	12 months
New York State Department of Health and ILÚM Health Solutions, LLC [Member] \| Collaborations Revenue [Member]
License Agreements Research Collaborations And Development Agreements [Line Items]
Revenue from contract	$ 500,000

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