Deferred Revenue, Income and Remaining Performance Obligations (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Deferred revenue and income	$ 255		$ 255		$ 217
Revenues recognized included in contract liabilities balances	58	$ 14	95	$ 35
Revenue expected to be recognized from remaining performance obligations	2,000		$ 2,000
Contact period			These service contracts typically provide for four-year terms and revenue is recognized on a straight-line basis. The balance also includes product shipments for reagent rental, sales-type lease agreements. The agreements have between two and four year terms and revenue is recognized as product is shipped, typically in a straight-line pattern.
Products and services not yet delivered
Disaggregation of Revenue [Line Items]
Deferred revenue and income	$ 255		$ 255		$ 217