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Cash, cash equivalents and short-term investments (Tables) | 6 Months Ended
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Jun. 30, 2013
Cash, cash equivalents and short-term investments |
Summary of cash, cash equivalents and marketable securities | The following tables summarize our cash, cash equivalents and marketable securities at June 30, 2013 and December 31, 2012 (in thousands):
As of June 30, 2013 |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |
Cash and money market funds |  | $ | 28,193 |  | $ | — |  | $ | — |  | $ | 28,193 |
Corporate debt securities |  |  |  |  |  |  |  |  |
Due in one year or less |  | 20,251 |  | 1 |  | (16 | ) | 20,236 |
Due in two years or less |  | 5,927 |  | — |  | (11 | ) | 5,916 |
Total |  | $ | 54,371 |  | $ | 1 |  | $ | (27 | ) | $ | 54,345 |
Reported as: |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ | 28,193 |  | $ | — |  | $ | — |  | $ | 28,193 |
Short-term investments |  | 26,178 |  | 1 |  | (27 | ) | 26,152 |
Total |  | $ | 54,371 |  | $ | 1 |  | $ | (27 | ) | $ | 54,345 |
As of December 31, 2012 |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |
Cash and money market funds |  | $ | 14,776 |  | $ | — |  | $ | — |  | $ | 14,776 |
Corporate debt securities |  |  |  |  |  |  |  |  |
Due in one year or less |  | 5,754 |  | 2 |  | (1 | ) | 5,755 |
Due in two years or less |  | 10,867 |  | 3 |  | (10 | ) | 10,860 |
Total |  | $ | 31,397 |  | $ | 5 |  | $ | (11 | ) | $ | 31,391 |
Reported as: |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ | 14,776 |  | $ | — |  | $ | — |  | $ | 14,776 |
Marketable securities |  | 16,621 |  | 5 |  | (11 | ) | 16,615 |
Total |  | $ | 31,397 |  | $ | 5 |  | $ | (11 | ) | $ | 31,391 |

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