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Major Customers and Concentration of Credit Risk (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Concentration Risk [Line Items]
Revenue	$ 42,220,086	$ 35,368,361	$ 40,572,111
Revenue | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage	100.00%	100.00%	100.00%
MedImmune
Concentration Risk [Line Items]
Revenue	$ 22,269,773	$ 1,518,639	$ 16,037,731
Accounts receivable	$ 1,700,000	$ 1,200,000
MedImmune | Revenue | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage	53.00%	4.00%	40.00%
MedImmune | Accounts Receivable | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage	28.00%	7.00%
DARPA
Concentration Risk [Line Items]
Revenue	$ 9,983,927	$ 26,602,183	$ 11,582,623
Accounts receivable	4,100,000	$ 12,100,000
Unbilled receivables	$ 1,600,000
Estimated collection period for unbilled receivables	12 months
DARPA | Revenue | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage	24.00%	75.00%	28.00%
DARPA | Accounts Receivable | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage	69.00%	73.00%
Roche
Concentration Risk [Line Items]
Revenue	$ 6,107,254	$ 4,917,929	$ 10,778,688
Accounts receivable		$ 2,400,000
Roche | Revenue | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage	14.00%	14.00%	27.00%
Roche | Accounts Receivable | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage		15.00%
NIAID
Concentration Risk [Line Items]
Revenue	$ 0	$ 118,171	$ 901,475
NIAID | Revenue | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage	0.00%	0.00%	2.00%
GeneOne (affiliated entity)
Concentration Risk [Line Items]
Revenue	$ 551,208	$ 1,188,432	$ 450,000
GeneOne (affiliated entity) | Revenue | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage	1.00%	4.00%	1.00%
All other
Concentration Risk [Line Items]
Revenue	$ 3,307,924	$ 1,023,007	$ 821,594
All other | Revenue | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage	8.00%	3.00%	2.00%
Minimum | DARPA
Concentration Risk [Line Items]
Age of unbilled receivables	1 month
Maximum | DARPA
Concentration Risk [Line Items]
Age of unbilled receivables	9 months

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