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Organization and Basis of Presentation - IOP and DOSE Medical (Details) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
	Apr. 12, 2017	Jun. 30, 2017	Dec. 31, 2017	Dec. 31, 2015
Acquisition of IOP Sensor System
In-process research and development expensed		$ 5,320	$ 5,320
DOSE Medical Corporation
Acquisition of IOP Sensor System
Cash payments for the acquisition of certain assets of related party				$ 15,000
Maximum period of support under transition services agreement				3 years
Purchase Agreement for an IOP System | DOSE Medical Corporation
Acquisition of IOP Sensor System
Cash payments for the acquisition of certain assets of related party	$ 5,500
Maximum performance-based consideration	9,500
In-process research and development expensed	5,300
Capitalized fixed assets	$ 200

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