Goodwill and Acquired Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Rollforward of goodwill balance
Balance as of beginning of period			$ 1,308
Goodwill acquired			8,111
Cumulative translation adjustment			(458)
Balance as of end of period	$ 8,961		8,961		$ 1,308
Purchased intangible assets
Gross Carrying Value	16,400		16,400		2,950
Accumulated Amortization	(1,444)		(1,444)		(602)
Cumulative Translation Adjustment	(735)		(735)
Net Carrying Value	14,221		14,221		$ 2,348
Amortization expense	500	$ 200	800	$ 400
Estimated amortization expense
2019	546		546
2020	2,110		2,110
2021	2,013		2,013
2022	1,930		1,930
2023	1,849		1,849
Thereafter	6,508		6,508
Estimated Amortization Expenses	14,956		14,956
UmanDiagnostics AB Acquisition [Member]
Rollforward of goodwill balance
Goodwill acquired			$ 13,500
Purchased intangible assets
Estimated Useful Life			8 years 4 months 24 days
Developed technology
Purchased intangible assets
Estimated Useful Life			7 years		7 years
Gross Carrying Value	1,650		$ 1,650		$ 1,650
Accumulated Amortization	(648)		(648)		(379)
Net Carrying Value	1,002		1,002		$ 1,271
Customer relationships
Purchased intangible assets
Estimated Useful Life					10 years
Gross Carrying Value	1,360		1,360		$ 1,250
Accumulated Amortization	(368)		(368)		(208)
Cumulative Translation Adjustment	(6)		(6)
Net Carrying Value	986		986		$ 1,042
Customer relationships | UmanDiagnostics AB Acquisition [Member]
Rollforward of goodwill balance
Goodwill acquired			$ 100
Purchased intangible assets
Estimated Useful Life			8 years 6 months
Trade names
Purchased intangible assets
Estimated Useful Life			3 years		3 years
Gross Carrying Value	50		$ 50		$ 50
Accumulated Amortization	(28)		(28)		(15)
Net Carrying Value	22		$ 22		$ 35
Know How
Purchased intangible assets
Estimated Useful Life			8 years 6 months
Gross Carrying Value	13,000		$ 13,000
Accumulated Amortization	(383)		(383)
Cumulative Translation Adjustment	(711)		(711)
Net Carrying Value	11,906		11,906
Know How | UmanDiagnostics AB Acquisition [Member]
Rollforward of goodwill balance
Goodwill acquired			$ 13,000
Purchased intangible assets
Estimated Useful Life			8 years 6 months
Noncompete Agreements
Purchased intangible assets
Estimated Useful Life			5 years 6 months
Gross Carrying Value	340		$ 340
Accumulated Amortization	(17)		(17)
Cumulative Translation Adjustment	(18)		(18)
Net Carrying Value	$ 305		305
Noncompete Agreements | UmanDiagnostics AB Acquisition [Member]
Rollforward of goodwill balance
Goodwill acquired			$ 400
Maximum | Customer relationships
Purchased intangible assets
Estimated Useful Life			10 years
Minimum | Customer relationships
Purchased intangible assets
Estimated Useful Life			8 years 6 months