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Summary of Significant Accounting Policies - Revenue Recognition - Condensed Statement of Cash flows (Details) - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2018 | Jun. 30, 2017
Cash flows from operating activities |  |
Net loss | $ (8,646) | $ (11,273)
Adjustments to reconcile net loss to net cash used in operating activities: |  |
Accounts receivable | (1,391) | (524)
Inventory | 940 | (1,584)
Shipping term reversal | (39) |
Deferred income on shipments to distributors |  | $ (237)
ASU 2014-09 | Balances without the adoption of Topic 606 |  |
Cash flows from operating activities |  |
Net loss | (9,974) |
Adjustments to reconcile net loss to net cash used in operating activities: |  |
Accounts receivable | (532) |
Inventory | 939 |
Shipping term reversal | 431 |
ASU 2014-09 | Adjustments |  |
Cash flows from operating activities |  |
Net loss | (1,328) |
Adjustments to reconcile net loss to net cash used in operating activities: |  |
Accounts receivable | 859 |
Inventory | (1) |
Shipping term reversal | $ 470 |

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