The Company and Basis of Presentation - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Mar. 27, 2019	Dec. 31, 2018	Nov. 06, 2018
Company And Basis Of Presentation [Line Items]
Working capital	$ 44,900		$ 44,900
Cash	18,570		18,570			$ 29,054
Minimum liquidity covenant amount	5,000		$ 5,000
Latest effective date of minimum liquidity covenant			2020-03
Depreciation	$ 1,500	$ 1,500	$ 3,100	$ 3,000
Reclassification | Surgical instruments
Company And Basis Of Presentation [Line Items]
Depreciation		$ 1,300		$ 2,600
Term Loan | Squadron Credit Agreement
Company And Basis Of Presentation [Line Items]
Secured debt agreement					$ 20,000		$ 35,000