Summary of Significant Accounting Policies - Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) reporting_unit	Jan. 01, 2019 USD ($)	Dec. 31, 2018 USD ($)
Summary of Significant Accounting Policies [Line Items]
Number of reporting units | reporting_unit	1
Number of months after shipment that certain customers may request replacement of products	6 months
Operating lease right-of-use assets	$ 5,768		$ 0
Operating lease liability	13,458
Deferred rent	$ 0	$ 7,900	$ 8,065
Minimum
Summary of Significant Accounting Policies [Line Items]
Payment terms with customers	30 days
Maximum
Summary of Significant Accounting Policies [Line Items]
Payment terms with customers	180 days
Revolving loan facility | Deerfield ELGX Revolver, LLC
Summary of Significant Accounting Policies [Line Items]
Required deposit presented as restricted cash	$ 1,200
Accounting Standards Update 2016-02
Summary of Significant Accounting Policies [Line Items]
Operating lease right-of-use assets		5,800
Operating lease liability		$ 13,700