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Acquisitions | 6 Months Ended
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Jun. 30, 2020
Business Combinations [Abstract] |
Acquisitions | 4. Acquisitions. On August 1, 2019, we entered into a share purchase agreement to acquire Fibrovein Holdings Limited, which is the owner of 100% of the capital stock of STD Pharmaceutical Products Limited, a UK private company engaged in the manufacture, distribution and sale of pharmaceutical sclerotherapy products (“STD Pharmaceutical”). The purchase consideration consisted of an upfront payment of approximately $13.7 million, net of cash acquired. We also recorded a contingent consideration liability of approximately $934,000 related to royalties potentially payable pursuant to the terms of the share purchase agreement. We accounted for this acquisition as a business combination. The sales and results of operations related to the acquisition have been included in our cardiovascular segment since the acquisition date and were not material. Acquisition-related costs associated with the STD Pharmaceutical acquisition, which were included in selling, general and administrative expenses, were not material. The purchase price was preliminarily allocated as follows (in thousands): ​
​ | ​ | ​ | ​
Assets Acquired |  | ​ |
Trade receivables | ​ | $ | 277
Inventories | ​ |  | 843
Prepaid expenses and other assets | ​ |  | 49
Intangible assets | ​ |  | ​
Developed technology | ​ | ​ | 10,428
Goodwill | ​ | ​ | 4,975
Total assets acquired | ​ |  | 16,572
​ | ​ | ​ | ​
Liabilities Assumed | ​ |  |
Trade payables | ​ |  | (53)
Accrued expenses | ​ |  | (29)
Deferred income tax liabilities | ​ |  | (1,890)
Total liabilities assumed | ​ |  | (1,972)
​ | ​ | ​ | ​
Total net assets acquired | ​ | $ | 14,600
​ We are amortizing the developed technology intangible asset acquired in the STD Pharmaceutical acquisition over 12 years. The goodwill consists largely of the synergies we hope to achieve from combining operations and is not expected to be deductible for income tax purposes. On June 14, 2019, we consummated an acquisition transaction contemplated by a merger agreement to acquire Brightwater Medical, Inc. ("Brightwater"). The purchase consideration consisted of an upfront payment of $35 million plus a final working capital adjustment of approximately $39,000, net of cash acquired, with potential earn-out payments of up to an additional $5 million for achievement of CE certification with respect to the Brightwater ConvertX®, a single-use device used to replace a series of devices and procedures used to treat severe obstructions of the ureter, and up to an additional $10 million for the achievement of sales milestones specified in the merger agreement. The ConvertX device is designed to be implanted once and converted from a nephroureteral catheter to a nephroureteral stent without requiring sedation or local anesthesia. Brightwater recently received FDA clearance for the ConvertX biliary stent device. We accounted for this acquisition as a business combination. The sales and results of operations related to the acquisition have been included in our cardiovascular segment since the acquisition date and were not material. Acquisition-related costs associated with the Brightwater acquisition, which were included in selling, general and administrative expenses, were not material. During the three-month period ended June 30, 2020, certain non-significant measurement period adjustments were recorded resulting from our ongoing activities with respect to finalizing our purchase price allocation, including reassessment of the tax assets and liabilities for this acquisition. The following table summarizes the purchase price allocated to the net assets acquired as follows (in thousands): ​
​ | ​ | ​ | ​
Assets Acquired |  | ​ | ​
Trade receivables | ​ | $ | 55
Inventories | ​ |  | 349
Property and equipment | ​ |  | 409
Other long-term assets | ​ |  | 30
Intangible assets | ​ |  |
Developed technology | ​ |  | 31,960
Customer lists | ​ |  | 83
Trademarks | ​ |  | 250
Goodwill | ​ |  | 17,607
Total assets acquired | ​ |  | 50,743
​ | ​ | ​ | ​
Liabilities Assumed | ​ |  |
Trade payables | ​ |  | (58)
Accrued expenses | ​ |  | (261)
Other long-term obligations | ​ |  | (1,522)
Deferred income tax liabilities | ​ |  | (4,263)
Total liabilities assumed | ​ |  | (6,104)
​ | ​ | ​ | ​
Total net assets acquired | ​ | $ | 44,639
​ We are amortizing the developed technology intangible asset acquired in the Brightwater acquisition over 13 years, the related trademarks over five years and the customer list on an accelerated basis over one year. The total weighted-average amortization period for these acquired intangible assets is approximately 12.9 years. The goodwill consists largely of the synergies and economies of scale we hope to achieve from combining the acquired assets and operations with our historical operations and is not expected to be deductible for income tax purposes. The pro forma impact of these acquisitions was not significant, either individually or in the aggregate, on our financial results for the three and six-month periods ended June 30, 2019. Operating results attributable to the STD Pharmaceutical and Brightwater acquisitions were included in our consolidated statements of income (loss) for the three and six-month periods ended June 30, 2020.

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- Definition The entire disclosure for a business combination (or series of individually immaterial business combinations) completed during the period, including background, timing, and recognized assets and liabilities. The disclosure may include leverage buyout transactions (as applicable). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -URI http://asc.fasb.org/topic&trid=2303972 + Details
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