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Balance Sheet Details | 12 Months Ended
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Dec. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Balance Sheet Details | 3. Balance Sheet Details Short-Term Investments Short-term investments consist of U.S. government agency and government sponsored enterprise obligations. The Company accounts for these short-term investments as required by FASB ASC Topic No. 320, Investments-Debt and Equity Securities. These debt and equity securities are not classified as either held-to-maturity securities or trading securities. As such, they are classified as available-for-sale securities. Available-for-sale securities are recorded at fair value, with unrealized gains or losses recorded as a separate component of accumulated other comprehensive income in stockholders’ equity until realized. Available-for-sale securities with contractual maturities of less than 12 months were as follows (in thousands):
|  | December 31, 2015 |  |  | December 31, 2014 |
|  | Amortized cost basis |  |  | Gross unrealized loss |  |  | Fair value |  |  | Amortized cost basis |  |  | Gross unrealized loss |  |  | Fair value |
Corporate bonds and notes |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 1,000 |  |  | $ | (1 | ) |  | $ | 999 |
Government securities/money market |  |  | 4,080 |  |  |  | (2 | ) |  |  | 4,078 |  |  |  | 1,881 |  |  |  | — |  |  |  | 1,881 |
Total |  | $ | 4,080 |  |  | $ | (2 | ) |  | $ | 4,078 |  |  | $ | 2,881 |  |  | $ | (1 | ) |  | $ | 2,880 |
There were no realized gains (losses) recognized in interest and other income for the years ended December 31, 2015, 2014, and 2013. Equipment and Improvements Equipment and improvements consist of the following (in thousands):
|  | December 31, |
|  | 2015 |  |  | 2014 |
Computer hardware, software, and equipment |  | $ | 16,288 |  |  | $ | 16,143 |
Leasehold improvements |  |  | 5,170 |  |  |  | 5,170 |
Office furniture and fixtures |  |  | 1,214 |  |  |  | 1,213 |
|  |  | 22,672 |  |  |  | 22,526 |
Less accumulated depreciation and amortization |  |  | (20,180 | ) |  |  | (18,253 | )
Equipment and improvements, net |  | $ | 2,492 |  |  | $ | 4,273 |
Depreciation and amortization expense on equipment and improvements was $1.9 million, $2.9 million and $4.0 million for the years ended December 31, 2015, 2014, and 2013 respectively. Other Assets These are office rent deposits. Accrued Liabilities Accrued liabilities consist of the following (in thousands):
|  | December 31, |
|  | 2015 |  |  | 2014 |
Salaries and benefits |  | $ | 2,723 |  |  | $ | 2,779 |
Restructuring |  |  | 442 |  |  |  | 912 |
Pennsylvania grant liability |  |  | 1,000 |  |  |  | 1,000 |
Royalties and revenue sharing |  |  | 643 |  |  |  | 835 |
Income taxes |  |  | 205 |  |  |  | 160 |
Marketing expenses, rebates, and other |  |  | 51 |  |  |  | 66 |
Total accrued liabilities |  | $ | 5,064 |  |  | $ | 5,752 |
Deferred Rent and Other Long-Term Liabilities Deferred rent and other long-term liabilities consist of the following (in thousands):
|  | December 31, |
|  | 2015 |  |  | 2014 |
Deferred rent |  | $ | 1,402 |  |  | $ | 1,643 |
Restructuring - beyond one year |  |  | 1,767 |  |  |  | 1,977 |
Sublease deposits |  |  | 66 |  |  |  | 23 |
Total deferred rent and other long-term liabilities |  | $ | 3,235 |  |  | $ | 3,643 |

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