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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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Revenue from Contracts with Customers - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Disaggregation Of Revenue [Line Items]
Agreements for product and product-related services revenue	1 year		1 year
Agreements for product and product-related services revenue, description			The Company’s agreements for product and product-related services revenue have an expected duration of one year or less
Revenue	$ 4,706,378	$ 3,723,484	$ 13,775,796	$ 6,855,409
Contract liabilities	387,975		387,975		$ 837,885
Cumulative catch up adjustment	0		30,055
Collaborative Development Services
Disaggregation Of Revenue [Line Items]
Revenue	3,391,534	2,130,694	$ 8,704,094	2,433,105
Contract liabilities					110,317
Bristol Myers Squibb
Disaggregation Of Revenue [Line Items]
Agreement expiration date			May 11, 2019
Number of days material breach remains uncured			60 days
Agreement termination notice period			90 days
Revenue	166,714	31,250	$ 298,938	93,750
Contract liabilities	79,918		79,918		$ 160,106
Partially unsatisfied performance obligation aggregate amount	50,000		50,000
Merck KGaA Agreement \| Collaborative Development Services
Disaggregation Of Revenue [Line Items]
Revenue	$ 0	0	$ 0	25,000
Additional milestone payment earned		$ 0		$ 0
Minimum
Disaggregation Of Revenue [Line Items]
Customer payment term			30 days
Maximum
Disaggregation Of Revenue [Line Items]
Customer payment term			90 days