Revenue from Contracts with Customers - Schedule of Disaggregated Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	$ 28,616	$ 27,016	$ 76,700	$ 79,672
Instruments
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	5,429	4,444	15,591	14,949
Consumables
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	11,140	9,020	30,778	26,806
In vitro diagnostic kits
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	2,547	1,689	7,234	4,963
Total product revenue
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	19,116	15,153	53,603	46,718
Service revenue
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	2,337	1,762	6,279	4,272
Total product and service revenue
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	21,453	16,915	59,882	50,990
Collaboration revenue
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	7,163	10,101	16,818	28,682
Americas
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	21,032	20,060	53,865	59,612
Americas | Instruments
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	3,696	1,760	9,512	7,603
Americas | Consumables
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	7,808	6,146	20,770	18,265
Americas | In vitro diagnostic kits
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	783	705	2,382	1,883
Americas | Total product revenue
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	12,287	8,611	32,664	27,751
Americas | Service revenue
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	1,582	1,348	4,383	3,179
Americas | Total product and service revenue
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	13,869	9,959	37,047	30,930
Americas | Collaboration revenue
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	7,163	10,101	16,818	28,682
Europe and Middle East
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	6,110	4,911	18,260	14,564
Europe and Middle East | Instruments
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	1,149	1,392	4,189	4,231
Europe and Middle East | Consumables
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	2,633	2,283	7,882	6,481
Europe and Middle East | In vitro diagnostic kits
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	1,687	869	4,600	2,890
Europe and Middle East | Total product revenue
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	5,469	4,544	16,671	13,602
Europe and Middle East | Service revenue
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	641	367	1,589	962
Europe and Middle East | Total product and service revenue
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	6,110	4,911	18,260	14,564
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	1,474	2,045	4,575	5,496
Asia Pacific | Instruments
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	584	1,292	1,890	3,115
Asia Pacific | Consumables
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	699	591	2,126	2,060
Asia Pacific | In vitro diagnostic kits
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	77	115	252	190
Asia Pacific | Total product revenue
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	1,360	1,998	4,268	5,365
Asia Pacific | Service revenue
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	114	47	307	131
Asia Pacific | Total product and service revenue
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	1,474	2,045	4,575	5,496
Asia Pacific | Collaboration revenue
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	$ 0	$ 0	$ 0	$ 0