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Consolidated Balance Sheets and Statements of Operations and Comprehensive Loss Components (Tables) | 12 Months Ended
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Dec. 31, 2014
Consolidated Balance Sheets and Statements of Operations and Comprehensive Loss Components |
Schedule of inventory prepaid expenses and other current assets and property and equipment |
|  | December 31, |
|  | 2014 |  | 2013 |
|  | (in thousands) |
Inventories: |  |  |  |  |  |  |
Work-in-process |  | $ | 651 |  | $ | 542 |
Finished goods |  |  | 230 |  |  | 25 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
|  | $ | 881 |  | $ | 567 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Prepaid expenses and other: |  |  |  |  |  |  |
Interest receivable |  | $ | 160 |  | $ | 382 |
Prepaid insurance |  |  | 143 |  |  | 127 |
Prepaid expenses and other |  |  | 584 |  |  | 595 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
|  | $ | 887 |  | $ | 1,104 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Property and equipment, net: |  |  |  |  |  |  |
Equipment, furniture and fixtures and leasehold improvements |  | $ | 4,255 |  | $ | 3,923 |
Acquired software |  |  | 750 |  |  | 686 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
|  |  | 5,005 |  |  | 4,609 |
Less: Accumulated depreciation and amortization |  |  | (4,151 | ) |  | (3,903 | )
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
|  | $ | 854 |  | $ | 706 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Schedule of identifiable intangible assets |
|  | December 31, 2014 |
|  | Life (years) |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |
Developed technology |  |  | 3-5 |  | $ | 9,240 |  | $ | 9,031 |  | $ | 209 |
Patent license |  |  | 7 |  |  | 780 |  |  | 334 |  |  | 446 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total |  |  |  |  | $ | 10,020 |  | $ | 9,365 |  | $ | 655 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
|  | December 31, 2013 |
|  | Life (years) |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |
Developed technology |  |  | 3-5 |  | $ | 9,240 |  | $ | 8,142 |  | $ | 1,098 |
Patent license |  |  | 7 |  |  | 780 |  |  | 223 |  |  | 557 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total |  |  |  |  | $ | 10,020 |  | $ | 8,365 |  | $ | 1,655 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Schedule of accrued expenses and other liabilities |
|  | December 31, |
|  | 2014 |  | 2013 |
|  | (in thousands) |
Accrued expenses and other: |  |  |  |  |  |  |
Accrued wages and employee benefits |  | $ | 1,026 |  | $ | 818 |
Employee stock purchase plan withholdings |  |  | 357 |  |  | 286 |
IC development wafer costs |  |  | 203 |  |  | — |
Professional fees |  |  | 123 |  |  | 61 |
Deferred revenue |  |  | 4 |  |  | 170 |
Other |  |  | 637 |  |  | 744 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
|  | $ | 2,350 |  | $ | 2,079 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Schedule of other income, net |
|  | 2014 |  | 2013 |  | 2012 |
|  | (in thousands) |
Interest income |  | $ | 155 |  | $ | 174 |  | $ | 171 |
Other income (expense), net |  |  | (12 | ) |  | 35 |  |  | (16 | )
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
|  | $ | 143 |  | $ | 209 |  | $ | 155 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​

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