Significant Accounting Policies (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Allowance for doubtful accounts	$ 200		$ 0
Amounts invoiced and not collected	2,805		9,006
Deferred cost of sales	$ 393		$ 1,261
Group purchasing organization administrative fees (percent)	3.00%
Patent application costs	$ 151	$ 253
Minimum
Finite-Lived Intangible Assets [Line Items]
Typical payment period for customers	30 days
Maximum
Finite-Lived Intangible Assets [Line Items]
Typical payment period for customers	60 days