Revenue from Contracts with Customers - Schedule of Disaggregated Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	$ 30,604	$ 28,616	$ 88,637	$ 76,700
Instruments
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	8,037	5,429	17,295	15,591
Consumables
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	12,736	11,140	36,656	30,778
In vitro diagnostic kits
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	2,517	2,547	7,445	7,234
Total product revenue
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	23,290	19,116	61,396	53,603
Service revenue
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	3,059	2,337	8,673	6,279
Total product and service revenue
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	26,349	21,453	70,069	59,882
Collaboration revenue
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	4,255	7,163	18,568	16,818
Americas
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	21,730	21,032	63,235	53,865
Americas | Instruments
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	5,823	3,696	11,609	9,512
Americas | Consumables
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	8,872	7,808	25,241	20,770
Americas | In vitro diagnostic kits
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	776	783	1,852	2,382
Americas | Total product revenue
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	15,471	12,287	38,702	32,664
Americas | Service revenue
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	2,004	1,582	5,965	4,383
Americas | Total product and service revenue
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	17,475	13,869	44,667	37,047
Americas | Collaboration revenue
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	4,255	7,163	18,568	16,818
Europe and Middle East
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	7,128	6,110	20,636	18,260
Europe and Middle East | Instruments
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	1,577	1,149	4,066	4,189
Europe and Middle East | Consumables
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	3,040	2,633	9,084	7,882
Europe and Middle East | In vitro diagnostic kits
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	1,670	1,687	5,350	4,600
Europe and Middle East | Total product revenue
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	6,287	5,469	18,500	16,671
Europe and Middle East | Service revenue
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	841	641	2,136	1,589
Europe and Middle East | Total product and service revenue
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	7,128	6,110	20,636	18,260
Europe and Middle East | Collaboration revenue
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	0	0	0	0
Asia Pacific
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	1,746	1,474	4,766	4,575
Asia Pacific | Instruments
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	637	584	1,620	1,890
Asia Pacific | Consumables
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	824	699	2,331	2,126
Asia Pacific | In vitro diagnostic kits
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	71	77	243	252
Asia Pacific | Total product revenue
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	1,532	1,360	4,194	4,268
Asia Pacific | Service revenue
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	214	114	572	307
Asia Pacific | Total product and service revenue
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	1,746	1,474	4,766	4,575
Asia Pacific | Collaboration revenue
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	$ 0	$ 0	$ 0	$ 0