Acquisition (Details) - USD ($) $ in Thousands			6 Months Ended
		May. 12, 2014	Jun. 30, 2015	Jan. 31, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Common stock, outstanding (in shares)			22,076,718		20,376,245
Goodwill			$ 21,076		$ 20,906
LCA Vision Inc. [Member]
Business Acquisition [Line Items]
Effective date of merger			May 12, 2014
Percentage of shares acquired by wholly-owned subsidiary (in hundredths)		100.00%
Percentage of shares sold for wholly-owned subsidiary (in hundredths)				100.00%
Fair value LCA-Vision stock	[1]	$ 103,896
Fair value of LCA-Vision restricted stock units, including payroll taxes	[2]	2,656
Total purchase price		$ 106,552
Common stock, outstanding (in shares)		19,347,554
Restricted stock, outstanding or deemed to be outstanding (in shares)		476,436
Goodwill		$ 49,582
Fair value of the assets acquired and liabilities assumed [Abstract]
Cash and cash equivalents		29,042
Current assets, excluding cash and cash equivalents		6,114
Deferred tax asset, current		1,124
Property, plant and equipment		17,269
Identifiable intangible assets		39,050
Other assets		1,518
Total assets acquired at fair value		94,117
Current liabilities		(19,009)
Long-term debt		(1,603)
Deferred tax liability, long-term		(9,138)
Other long-term liabilities		(7,397)
Total liabilities assumed		(37,147)
Net assets acquired		$ 56,970
Cash consideration from sale of business				$ 40,000

[1] Based on 19,347,554 outstanding shares of LCA-Vision common stock at May 12, 2014.

[2] Based on 476,436 outstanding or deemed to be outstanding restricted stock units of LCA-Vision common stock at May 12, 2014.