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Summary of Significant Accounting Policies - Revenue Recognition - Condensed Balance Sheet (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Summary of Significant Accounting Policies |  |
Accumulated deficit | $ (124,885) | $ (117,539)
Current assets: |  |
Accounts receivable, net | 5,097 | 4,041
Inventory | 8,851 | 9,837
Total current assets | 47,898 | 27,418
Total assets | 51,564 | 31,437
Current liabilities: |  |
Deferred income on shipments to distributors |  | 1,720
Total current liabilities | 15,215 | 12,375
Total liabilities | 20,581 | 20,553
Stockholders' equity: |  |
Accumulated deficit | (124,885) | (117,539)
Total liabilities and stockholders' equity | 51,564 | 31,437
ASU 2014-09 | Balances without the adoption of Topic 606 |  |
Summary of Significant Accounting Policies |  |
Accumulated deficit | (127,513) |
Current assets: |  |
Accounts receivable, net | 4,573 |
Inventory | 8,898 |
Total current assets | 47,421 |
Total assets | 51,087 |
Current liabilities: |  |
Deferred income on shipments to distributors | 2,151 |
Total current liabilities | 17,366 |
Total liabilities | 22,732 |
Stockholders' equity: |  |
Accumulated deficit | (127,513) |
Total liabilities and stockholders' equity | 51,087 |
ASU 2014-09 | Adjustments |  |
Summary of Significant Accounting Policies |  |
Accumulated deficit | (2,628) | 1,300
Current assets: |  |
Accounts receivable, net | (524) |
Inventory | 47 |
Total current assets | (477) |
Total assets | (477) |
Current liabilities: |  |
Deferred income on shipments to distributors | 2,151 |
Total current liabilities | 2,151 |
Total liabilities | 2,151 |
Stockholders' equity: |  |
Accumulated deficit | (2,628) | $ 1,300
Total liabilities and stockholders' equity | $ (477) |

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