Revenue Recognition (Details) $ in Thousands	1 Months Ended	3 Months Ended			9 Months Ended
	Apr. 30, 2016	Sep. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) item	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Revenue recognized					$ 700
Agreement term	4 years
Deferred revenue		$ 38,006			38,006		$ 1,420
Total revenues		65,280		$ 55,910	190,689	$ 157,575
Noncurrent deferred revenue		36,850			36,850
Deferred revenue, current portion		1,156			1,156		$ 1,420
Product
Revenue recognized		700			2,500
Total revenues		62,662		54,512	$ 177,284	153,835
Product | Minimum
Billing collection period (in months)					9 months
Product | Maximum
Billing collection period (in months)					12 months
Licensing and other
Total revenues		2,618		$ 1,398	$ 13,405	$ 3,740
Genetic testing services and provision of IVD kits
Revenue recognized					600
Storage services
Revenue recognized					100
Evercord
Noncurrent deferred revenue		2,500			$ 2,500
Evercord | Processing and storage services
Number of performance obligations | item					2
Evercord | Processing and storage services | Minimum
Billing collection period (in months)					6 months
Evercord | Processing and storage services | Maximum
Billing collection period (in months)					18 months
Evercord | Processing and storage services | Alternate
Billing collection period (in months)					12 months
Qiagen
Revenue recognized		100	$ 5,500		$ 5,700
Revenue, remaining performance obligation		9,300			9,300
Noncurrent deferred revenue		$ 34,300			$ 34,300
Qiagen | The Qiagen Agreement
Agreement term					10 years
Initial transaction price			$ 15,000
Laboratory distribution partners | Product | Minimum
Billing collection period (in months)					2 months
Laboratory distribution partners | Product | Maximum
Billing collection period (in months)					3 months