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Shareholders' Equity (Details) - USD ($) $ in Thousands | Jan. 20, 2016 | Jun. 30, 2017
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Retained Earnings [Member] | Accounting Standards Update 2016-09 [Member] | Impact Of Forfeitures On Compensation Cost [Member] |  |
Equity, Class of Treasury Stock [Line Items] |  |
Cumulative-effect adjustment |  | $ (238)
Additional Paid In Capital [Member] | Accounting Standards Update 2016-09 [Member] | Impact Of Forfeitures On Compensation Cost [Member] |  |
Equity, Class of Treasury Stock [Line Items] |  |
Cumulative-effect adjustment |  | 379
On-X Agreement [Member] |  |
Equity, Class of Treasury Stock [Line Items] |  |
Common shares issued | 3,703,699 |
Common stock value issued in business combination | $ 34,600 |
Deferred Tax Assets [Member] | Accounting Standards Update 2016-09 [Member] | Impact Of Forfeitures On Compensation Cost [Member] |  |
Equity, Class of Treasury Stock [Line Items] |  |
Cumulative-effect adjustment |  | $ 141

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