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Fair value measurements (Tables) | 9 Months Ended
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Sep. 30, 2018
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |
Schedule of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis | The fair value of the Company’s financial assets and liabilities measured on a recurring basis were as follows:
|  | September 30, 2018 |  |  | December 31, 2017 |
(U.S. Dollars, in thousands) |  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |  |  | Total |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collective trust funds |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 100 |
Treasury securities |  |  | 520 |  |  |  | — |  |  |  | — |  |  |  | 520 |  |  |  | 556 |
Equity warrants |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 311 |
Equity securities |  |  | — |  |  |  | 219 |  |  |  | — |  |  |  | 219 |  |  |  | 2,457 |
Debt security |  |  | — |  |  |  | — |  |  |  | 19,250 |  |  |  | 19,250 |  |  |  | 16,050 |
Total |  | $ | 520 |  |  | $ | 219 |  |  | $ | 19,250 |  |  | $ | 19,989 |  |  | $ | 19,474 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration |  | $ | — |  |  | $ | — |  |  | $ | (28,180 | ) |  | $ | (28,180 | ) |  | $ | — |
Deferred compensation plan |  |  | — |  |  |  | (1,291 | ) |  |  | — |  |  |  | (1,291 | ) |  |  | (1,379 | )
Total |  | $ | — |  |  | $ | (1,291 | ) |  | $ | (28,180 | ) |  | $ | (29,471 | ) |  | $ | (1,379 | )
Schedule of Changes in Valuation of Securities | The changes in valuation of these securities for the three months and nine months ended September 30, 2018 and 2017 are shown below:
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
(U.S. Dollars, in thousands) |  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Equity securities and warrants beginning balance |  | $ | 4,668 |  |  | $ | 2,768 |  |  | $ | 2,768 |  |  | $ | 2,768 |
Impact of adoption of ASU 2016-01 recognized in other income |  |  | — |  |  |  | — |  |  |  | 1,629 |  |  |  | — |
Purchase of additional common stock |  |  | — |  |  |  | — |  |  |  | 500 |  |  |  | — |
Fair value adjustments, expirations, and impairments recognized in other expense |  |  | (4,449 | ) |  |  | — |  |  |  | (4,678 | ) |  |  | — |
Equity securities and warrants ending balance |  | $ | 219 |  |  | $ | 2,768 |  |  | $ | 219 |  |  | $ | 2,768 |
Schedule of Reconciliation For Contingent Consideration Measured At Fair Value Using Significant Unobservable Inputs | The following table provides a reconciliation of the beginning and ending balances for the contingent consideration measured at fair value using significant unobservable inputs (Level 3):
(U.S. Dollars, in thousands) |  | 2018 |
Contingent consideration at January 1 |  | $ | — |
Acquisition date fair value |  |  | 25,491 |
Increase in fair value recognized in operating expenses |  |  | 2,689 |
Contingent consideration at September 30 |  | $ | 28,180 |
Fair Value, Inputs, Level 3 [Member] |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |
Schedule of Reconciliation of Available for Sale Debt Securities | The following table provides a reconciliation of the beginning and ending balances for debt securities measured at fair value using significant unobservable inputs (Level 3):
(U.S. Dollars, in thousands) |  | 2018 |  |  | 2017 |
Debt security at January 1 |  | $ | 16,050 |  |  | $ | 12,220 |
Accrued interest income |  |  | — |  |  |  | — |
Gains or losses recorded for the period |  |  |  |  |  |  |  |
Recognized in net income |  |  | — |  |  |  | (5,585 | )
Recognized in other comprehensive income |  |  | 3,200 |  |  |  | 2,365 |
Debt security at September 30 |  | $ | 19,250 |  |  | $ | 9,000 |

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- Definition Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19279-110258 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19190-110258 + Details
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