Business combinations (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
	Aug. 01, 2019	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Fair value of consideration transferred:
Purchase price, net				$ 14,529	$ 3,800
Assets (liabilities) acquired:
Goodwill		$ 8,961		8,961		$ 1,308
Revenue		14,944	$ 10,591	40,816	26,755
Net income		(9,870)	(7,657)	(29,838)	(22,202)
Revenue (unaudited)			10,787	41,593	27,574
Pre-tax loss (unaudited)			$ (7,898)	(27,841)	$ (24,254)
UmanDiagnostics AB Acquisition [Member]
Fair value of consideration transferred:
Common stock shares consideration	191,152
Common stock	$ 5,500
Cash	15,700
Cash and stock paid	21,217
Cash and cash equivalents acquired	1,221
Purchase price, net	19,996
Assets (liabilities) acquired:
Accounts receivable	638
Inventory	1,680
Prepaids and other current assets	114
Property and equipment	33
Intangibles	13,450
Goodwill	8,111
Accounts payable	(20)
Accrued expense and other current liabilities	(871)
Deferred tax liabilities	(3,139)
Total	$ 19,996
Revenue		400
Net income		100
Transaction costs		$ 1,000		$ 1,900