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Acquisitions - Purchase Price Allocation (Argon Medical Devices, Inc.) (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jan. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Business Acquisition [Line Items] |  |  |  |  |  |
Gain on bargain purchase |  | $ 778 |  | $ 0 | $ (10,796) | $ 0
Argon Medical Devices, Inc. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash and cash equivalents |  | 1,436 |  |  | 1,436 |
Trade receivables |  | 8,351 |  |  | 8,351 |
Inventories |  | 11,222 |  |  | 11,222 |
Prepaid expenses |  | 1,275 |  |  | 1,275 |
Property and equipment |  | 2,319 |  |  | 2,319 |
Deferred tax assets |  | 203 |  |  | 203 |
Total assets acquired |  | 29,406 |  |  | 29,406 |
Trade payables |  | (2,415) |  |  | (2,415) |
Accrued expenses |  | (5,083) |  |  | (5,083) |
Income taxes payable |  | (2) |  |  | (2) |
Deferred income tax liabilities - noncurrent |  | (1,010) |  |  | (1,010) |
Total liabilities assumed |  | (8,510) |  |  | (8,510) |
Total net assets acquired |  | 20,896 |  |  | 20,896 |
Gain on bargain purchase |  |  |  |  | (10,796) |
Total purchase price | $ 10,100 |  |  |  |  |
Provisional gain on bargain purchase |  | 778 | $ 669 |  |  |
Preliminary Allocation | Argon Medical Devices, Inc. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash and cash equivalents |  | 1,436 |  |  | 1,436 |
Trade receivables |  | 8,351 |  |  | 8,351 |
Inventories |  | 12,217 |  |  | 12,217 |
Prepaid expenses |  | 1,275 |  |  | 1,275 |
Property and equipment |  | 2,667 |  |  | 2,667 |
Deferred tax assets |  | 184 |  |  | 184 |
Total assets acquired |  | 31,530 |  |  | 31,530 |
Trade payables |  | (2,306) |  |  | (2,306) |
Accrued expenses |  | (5,083) |  |  | (5,083) |
Income taxes payable |  | (2) |  |  | (2) |
Deferred income tax liabilities - noncurrent |  | (999) |  |  | (999) |
Total liabilities assumed |  | (8,390) |  |  | (8,390) |
Total net assets acquired |  | 23,140 |  |  | 23,140 |
Gain on bargain purchase |  |  |  |  | (12,243) |
Total purchase price | 10,897 |  |  |  |  |
Adjustment | Argon Medical Devices, Inc. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash and cash equivalents |  | 0 |  |  | 0 |
Trade receivables |  | 0 |  |  | 0 |
Inventories |  | (995) |  |  | (995) |
Prepaid expenses |  | 0 |  |  | 0 |
Property and equipment |  | (348) |  |  | (348) |
Deferred tax assets |  | 19 |  |  | 19 |
Total assets acquired |  | (2,124) |  |  | (2,124) |
Trade payables |  | (109) |  |  | (109) |
Accrued expenses |  | 0 |  |  | 0 |
Income taxes payable |  | 0 |  |  | 0 |
Deferred income tax liabilities - noncurrent |  | (11) |  |  | (11) |
Total liabilities assumed |  | (120) |  |  | (120) |
Total net assets acquired |  | (2,244) |  |  | (2,244) |
Gain on bargain purchase |  |  |  |  | 1,447 |
Total purchase price | $ (797) |  |  |  |  |
Developed Technology Rights | Argon Medical Devices, Inc. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Intangibles |  | 2,200 |  |  | 2,200 |
Developed Technology Rights | Preliminary Allocation | Argon Medical Devices, Inc. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Intangibles |  | 2,600 |  |  | 2,600 |
Developed Technology Rights | Adjustment | Argon Medical Devices, Inc. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Intangibles |  | (400) |  |  | (400) |
Customer lists | Argon Medical Devices, Inc. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Intangibles |  | 1,500 |  |  | 1,500 |
Customer lists | Preliminary Allocation | Argon Medical Devices, Inc. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Intangibles |  | 1,300 |  |  | 1,300 |
Customer lists | Adjustment | Argon Medical Devices, Inc. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Intangibles |  | 200 |  |  | 200 |
Trademarks | Argon Medical Devices, Inc. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Intangibles |  | 900 |  |  | 900 |
Trademarks | Preliminary Allocation | Argon Medical Devices, Inc. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Intangibles |  | 1,500 |  |  | 1,500 |
Trademarks | Adjustment | Argon Medical Devices, Inc. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Intangibles |  | $ (600) |  |  | $ (600) |

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