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Acquisitions - Purchase Price Allocation (Argon Medical Devices, Inc.) (Details) - USD ($) $ in Thousands |  | 3 Months Ended
--- | --- | ---
Jan. 31, 2017 | Mar. 31, 2017 | Mar. 31, 2016
Business Acquisition [Line Items] |  |  |
Gain on bargain purchase |  | $ (12,243) | $ 0
Argon Medical Devices, Inc. |  |  |
Business Acquisition [Line Items] |  |  |
Cash and cash equivalents |  | 1,436 |
Trade receivables |  | 8,351 |
Inventories |  | 12,217 |
Prepaid expenses |  | 1,275 |
Property and equipment |  | 2,667 |
Deferred tax assets |  | 184 |
Total assets acquired |  | 31,530 |
Trade payables |  | (2,306) |
Accrued expenses |  | (5,083) |
Income taxes payable |  | (2) |
Deferred income tax liabilities - noncurrent |  | (999) |
Total liabilities assumed |  | 8,390 |
Total net assets acquired |  | 23,140 |
Gain on bargain purchase |  | (12,243) |
Total purchase price | $ 10,897 |  |
Developed technology | Argon Medical Devices, Inc. |  |  |
Business Acquisition [Line Items] |  |  |
Intangibles |  | 2,600 |
Customer Lists | Argon Medical Devices, Inc. |  |  |
Business Acquisition [Line Items] |  |  |
Intangibles |  | 1,300 |
Trademarks | Argon Medical Devices, Inc. |  |  |
Business Acquisition [Line Items] |  |  |
Intangibles |  | $ 1,500 |

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