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Fair Value of Financial Instruments (Tables)
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9 Months Ended |
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Sep. 30, 2013
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| Fair Value Disclosures [Abstract] |
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| Schedule of Cash and Cash Equivalents, Available-for-sale Securities, Restricted Cash Reconciliation |
The Company's cash and cash equivalents, short-term investments, long-term investments and restricted cash consist of the following:
| | | | | | | | | | | | | | | | | | | | September 30, 2013 | | | Amortized Cost | | Unrealized Gains | | Unrealized Losses | | Fair Value | | | (in thousands) | Cash and cash equivalents: | | | | | | | | | Cash | | $ | 25,434 |
| | $ | — |
| | $ | — |
| | $ | 25,434 |
| Money market funds | | 5,086 |
| | — |
| | — |
| | 5,086 |
| Commercial paper | | 11,597 |
| | 1 |
| | — |
| | 11,598 |
| Total | | 42,117 |
| | 1 |
| | — |
| | 42,118 |
| Short-term investments: | | | | | | | | | Commercial paper | | 43,960 |
| | 14 |
| | (1 | ) | | 43,973 |
| Corporate bonds | | 9,640 |
| | 7 |
| | — |
| | 9,647 |
| Municipal bonds | | 1,127 |
| | — |
| | (1 | ) | | 1,126 |
| U.S. government agencies | | 4,001 |
| | 1 |
| | — |
| | 4,002 |
| Total | | 58,728 |
| | 22 |
| | (2 | ) | | 58,748 |
| Long-term investments: | | | | | | | | | Asset-backed securities | | 3,996 |
| | 3 |
| | (1 | ) | | 3,998 |
| U.S. government agencies | | 4,711 |
| | 2 |
| | — |
| | 4,713 |
| Corporate bonds | | 16,083 |
| | 13 |
| | (2 | ) | | 16,094 |
| Total | | 24,790 |
| | 18 |
| | (3 | ) | | 24,805 |
| Total | | $ | 125,635 |
| | $ | 41 |
| | $ | (5 | ) | | $ | 125,671 |
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| | | | | | | | | | | | | | | | | | | | December 31, 2012 | | | Amortized Cost | | Unrealized Gains | | Unrealized Losses | | Fair Value | | | (in thousands) | Cash and cash equivalents: | | | | | | | | | Cash | | $ | 23,419 |
| | $ | — |
| | $ | — |
| | $ | 23,419 |
| Money market funds | | 170 |
| | — |
| | — |
| | 170 |
| Commercial paper | | 11,294 |
| | 2 |
| | — |
| | 11,296 |
| Total | | 34,883 |
| | 2 |
| | — |
| | 34,885 |
| Short-term investments: | | | | | | | | | Commercial paper | | 21,078 |
| | 2 |
| | — |
| | 21,080 |
| U.S. government agencies | | 62,463 |
| | 4 |
| | — |
| | 62,467 |
| Total | | 83,541 |
| | 6 |
| | — |
| | 83,547 |
| Restricted cash - cash | | 114 |
| | — |
| | — |
| | 114 |
| Total | | $ | 118,538 |
| | $ | 8 |
| | $ | — |
| | $ | 118,546 |
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| Schedule of Assets Measured on Recurring Basis |
lowing table sets forth by level within the fair value hierarchy the fair value of the Company's available-for-sale securities measured on a recurring basis:
| | | | | | | | | | | | | | | | | | | | September 30, 2013 | | | Level 1 | | Level 2 | | Level 3 | | Fair Value | | | (in thousands) | Commercial paper | | $ | — |
| | $ | 55,571 |
| | $ | — |
| | $ | 55,571 |
| U.S. government agencies | | — |
| | 8,715 |
| | — |
| | 8,715 |
| Municipal bonds | | — |
| | 1,126 |
| | — |
| | 1,126 |
| Corporate bonds | | — |
| | 25,741 |
| | — |
| | 25,741 |
| Asset-backed securities | | — |
| | 3,998 |
| | — |
| | 3,998 |
| Total | | $ | — |
| | $ | 95,151 |
| | $ | — |
| | $ | 95,151 |
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| | | | | | | | | | | | | | | | | | | | December 31, 2012 | | | Level 1 | | Level 2 | | Level 3 | | Fair Value | | | (in thousands) | Commercial paper | | $ | — |
| | $ | 32,376 |
| | $ | — |
| | $ | 32,376 |
| U.S. government agencies | | — |
| | 62,467 |
| | — |
| | 62,467 |
| Total | | $ | — |
| | $ | 94,843 |
| | $ | — |
| | $ | 94,843 |
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| Schedule of Available-for-Sale Securities by Contractual Maturity |
The following summarizes the fair value of securities classified as available-for-sale by contractual maturity:
| | | | | | | | | | | | | | | | | | | | September 30, 2013 | | | Mature within One Year | | After One Year through Two Years | | Over Two Years | | Fair Value | | | (in thousands) | Commercial paper | | $ | 55,571 |
| | $ | — |
| | $ | — |
| | $ | 55,571 |
| U.S. government agencies | | 4,002 |
| | 4,713 |
| | — |
| | 8,715 |
| Municipal bonds | | 1,126 |
| | — |
| | — |
| | 1,126 |
| Corporate bonds | | 9,647 |
| | 16,094 |
| | — |
| | 25,741 |
| Asset-backed securities | | — |
| | — |
| | 3,998 |
| | 3,998 |
| Total | | $ | 70,346 |
| | $ | 20,807 |
| | $ | 3,998 |
| | $ | 95,151 |
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| | | | | | | | | | | | | | | | | | | | December 31, 2012 | | | Mature within One Year | | After One Year through Two Years | | Over Two Years | | Fair Value | | | (in thousands) | Commercial paper | | $ | 32,376 |
| | $ | — |
| | $ | — |
| | $ | 32,376 |
| U.S. government agencies | | 62,467 |
| | — |
| | — |
| | 62,467 |
| Total | | $ | 94,843 |
| | $ | — |
| | $ | — |
| | $ | 94,843 |
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