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Basis of Presentation - Schedule of Effect of New Accounting Pronouncements (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Jan. 01, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Assets |  |  |
Inventories, net | $ 69,417 | $ 72,860 | $ 76,420
Liabilities |  |  |
Deferred revenue | 47 | 473 | 4,703
Stockholders' Equity |  |  |
Retained earnings | $ 39,757 | 107,593 | 106,923
Before ASU 2014-09 |  |  |
Assets |  |  |
Inventories, net |  |  | 76,420
Liabilities |  |  |
Deferred revenue |  |  | 4,703
Stockholders' Equity |  |  |
Retained earnings |  |  | $ 106,923
Accounting Standards Update 2014-09 | Adjustments due to ASU 2014-09 |  |  |
Assets |  |  |
Inventories, net |  | (3,560) |
Liabilities |  |  |
Deferred revenue |  | (4,230) |
Stockholders' Equity |  |  |
Retained earnings |  | $ 670 |

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