Commitments and contingencies (Details Textual) - USD ($)		3 Months Ended	9 Months Ended
	Oct. 17, 2016	Jun. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Other Commitments [Line Items]
Operating Leases, Rent Expense, Net, Total			$ 756,608	$ 447,007
Operating lease description			During the second quarter of 2015, the Company extended the term of its Gaithersburg, Maryland office lease, effective May 7, 2015, through January 31, 2021, with one additional five-year renewal at the Company’s election. The Company is responsible for all utilities, repairs, insurance, and taxes under this operating lease. Effective July 1, 2015, the Company further modified its lease agreement to add additional leased space to its headquarters. Additionally, the Company leases office space in Denmark; this lease is currently on a month-to-month basis.
Capital leases description			The Company leases computer equipment, office furniture, and equipment under various capital leases. The leases expire at various dates through 2020. The leases require monthly principal and interest payments.
Capital leases expiration date description			The leases expire at various dates through 2020.
Gaithersburg, Maryland Office Lease [Member]
Other Commitments [Line Items]
Operating leases expiration date			Jan. 31, 2021
Operating leases additional term		5 years
Facility in Woburn, Massachusetts [Member]
Other Commitments [Line Items]
Operating leases expiration period			2017-01
Facility in Woburn, Massachusetts [Member] | AdvanDx [Member] | Subsequent Event [Member]
Other Commitments [Line Items]
Operating leases expiration date	Jan. 30, 2022
Operating leases additional term	5 years
Expected operating lease rent expense	$ 2,200,000