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Product Warranties (Tables) | 6 Months Ended
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Jun. 30, 2019
Guarantees and Product Warranties [Abstract] |
Product Warranty Activity | Product warranty activity was as follows (in thousands):
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
Balance at the beginning of the period |  | $ | 231 |  |  | $ | 346 |  |  | $ | 268 |  |  | $ | 290 |
Accruals for warranties for products sold in the period |  |  | 56 |  |  |  | 10 |  |  |  | 85 |  |  |  | 133 |
Fulfillment of warranty obligations |  |  | (17 | ) |  |  | (20 | ) |  |  | (83 | ) |  |  | (77 | )
Revisions of estimated obligations |  |  | — |  |  |  | (10 | ) |  |  | — |  |  |  | (20 | )
Balance at the end of the period |  | $ | 270 |  |  | $ | 326 |  |  | $ | 270 |  |  | $ | 326 |

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- Definition Tabular disclosure of the changes in the guarantor's aggregate product warranty liability, including the beginning balance of the aggregate product warranty liability, the aggregate reductions in that liability for payments made (in cash or in kind) under the warranty, the aggregate changes in the liability for accruals related to product warranties issued during the reporting period, the aggregate changes in the liability for accruals related to preexisting warranties (including adjustments related to changes in estimates), and the ending balance of the aggregate product warranty liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249 + Details
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