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Investments and Fair Value Measurement (Tables) | 9 Months Ended
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Sep. 30, 2013
Investments All Other Investments [Abstract] |
Schedule of Investments | The table below summarizes the Company’s available-for-sale securities (in thousands):
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized (Losses) |  |  | Estimated Fair Value |
September 30, 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 9,758 |  |  | $ | — |  |  | $ | — |  |  | $ | 9,758 |
Total |  |  | 9,758 |  |  |  | — |  |  |  | — |  |  |  | 9,758 |
Available-for-sale securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government sponsored entity debt securities |  |  | 52,577 |  |  |  | 26 |  |  |  | — |  |  |  | 52,603 |
Total |  |  | 52,577 |  |  |  | 26 |  |  |  | — |  |  |  | 52,603 |
Total cash equivalents and available-for-sale securities |  | $ | 62,335 |  |  | $ | 26 |  |  | $ | — |  |  | $ | 62,361 |
December 31, 2012 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government sponsored entity debt securities |  | $ | 2,997 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,997 |
Money market funds |  |  | 15,839 |  |  |  | — |  |  |  | — |  |  |  | 15,839 |
Total |  |  | 18,836 |  |  |  | — |  |  |  | — |  |  |  | 18,836 |
Available-for-sale securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government sponsored entity debt securities |  |  | 54,426 |  |  |  | 26 |  |  |  | — |  |  |  | 54,452 |
Total |  |  | 54,426 |  |  |  | 26 |  |  |  | — |  |  |  | 54,452 |
Total cash equivalents and available-for-sale securities |  | $ | 73,262 |  |  | $ | 26 |  |  | $ | — |  |  | $ | 73,288 |
Summary of Fair Value Measurements of Cash Equivalents and Available-for-Sale Securities | The fair value measurements of our cash equivalents and available-for-sale marketable securities are identified at the following levels within the fair value hierarchy (in thousands):
|  | September 30, 2013 Fair Value Measurements |
|  | Total |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 9,758 |  |  | $ | 9,758 |  |  | $ | — |  |  | $ | — |
Total |  |  | 9,758 |  |  |  | 9,758 |  |  |  | — |  |  |  | — |
Available-for-sale securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government sponsored entity debt securities |  |  | 52,603 |  |  |  | — |  |  |  | 52,603 |  |  |  | — |
Total |  |  | 52,603 |  |  |  | — |  |  |  | 52,603 |  |  |  | — |
Total cash equivalents and available-for-sale securities |  | $ | 62,361 |  |  | $ | 9,758 |  |  | $ | 52,603 |  |  | $ | — |
|  | December 31, 2012 Fair Value Measurements |
|  | Total |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government sponsored entity debt securities |  | $ | 2,997 |  |  | $ | — |  |  | $ | 2,997 |  |  | $ | — |
Money market funds |  |  | 15,839 |  |  |  | 15,839 |  |  |  | — |  |  |  | — |
Total |  |  | 18,836 |  |  |  | 15,839 |  |  |  | 2,997 |  |  |  | — |
Available-for-sale securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government sponsored entity debt securities |  |  | 54,452 |  |  |  | — |  |  |  | 54,452 |  |  |  | — |
Total |  |  | 54,452 |  |  |  | — |  |  |  | 54,452 |  |  |  | — |
Total cash equivalents and available-for-sale securities |  | $ | 73,288 |  |  | $ | 15,839 |  |  | $ | 57,449 |  |  | $ | — |

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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition Tabular disclosure of financial instruments measured at fair value, including those classified in shareholders' equity measured on a recurring or nonrecurring basis. Disclosures include, but are not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. Nonrecurring fair value measurements are those that are required or permitted in the statement of financial position in particular circumstances. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a,b,bb) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2C -URI http://asc.fasb.org/extlink&oid=25499696&loc=SL7498348-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19279-110258 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19190-110258 + Details
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