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Available-for-sale Securities and Fair Value on Financial Instruments (Tables) | 3 Months Ended
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Mar. 31, 2018
Fair Value Disclosures [Abstract] |
Summary of Available-for-Sale Securities | The following is a summary of available-for-sale securities at March 31, 2018 (in thousands):
|  | March 31, 2018 |
|  | Amortized Cost |  |  | Gross Unrealized Gain |  |  | Gross Unrealized Loss |  |  | Fair Value |
Money market funds |  | $ | 2,487 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,487 |
United States government agency securities |  |  | 16,953 |  |  |  | — |  |  |  | (39 | ) |  |  | 16,914 |
Corporate debt securities |  |  | 74,461 |  |  |  | — |  |  |  | (387 | ) |  |  | 74,074 |
Total available-for-sale securities |  | $ | 93,901 |  |  | $ | — |  |  | $ | (426 | ) |  | $ | 93,475 |
The following is a summary of available-for-sale securities at December 31, 2017 (in thousands):
|  | December 31, 2017 |
|  | Amortized Cost |  |  | Gross Unrealized Gain |  |  | Gross Unrealized Loss |  |  | Fair Value |
Money market funds |  | $ | 3,758 |  |  | $ | — |  |  | $ | — |  |  | $ | 3,758 |
United States government agency securities |  |  | 11,252 |  |  |  | — |  |  |  | (24 | ) |  |  | 11,228 |
Corporate debt securities |  |  | 35,858 |  |  |  | — |  |  |  | (73 | ) |  |  | 35,785 |
Total available-for-sale securities |  | $ | 50,868 |  |  | $ | — |  |  | $ | (97 | ) |  | $ | 50,771 |
Available-for-Sale Debt Securities by Original Contractual Maturity | Available-for-sale securities at March 31, 2018 and December 31, 2017, consisted of the following by contractual maturity (in thousands):
|  | March 31, 2018 |  |  | December 31, 2017 |
|  | Amortized Cost |  |  | Fair Value |  |  | Amortized Cost |  |  | Fair Value |
One year or less |  | $ | 31,278 |  |  | $ | 31,175 |  |  | $ | 38,836 |  |  | $ | 38,781 |
Greater than one year and less than five years |  |  | 62,623 |  |  |  | 62,300 |  |  |  | 12,032 |  |  |  | 11,990 |
Total available-for-sale securities |  | $ | 93,901 |  |  | $ | 93,475 |  |  | $ | 50,868 |  |  | $ | 50,771 |
Available-for-Sale Marketable Securities in Unrealized Position | The following tables show all available-for-sale marketable securities in an unrealized loss position for which an other-than-temporary impairment has not been recognized and the related gross unrealized losses and fair value, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position (in thousands):
| March 31, 2018 |
| Less than 12 Months |  |  | 12 Months or Greater |  |  | Total |
| Fair Value |  |  | Unrealized Loss |  |  | Fair Value |  |  | Unrealized Loss |  |  | Fair Value |  |  | Unrealized Loss |
United States government agency securities | $ | 16,914 |  |  | $ | (39 | ) |  | $ | — |  |  | $ | — |  |  | $ | 16,914 |  |  | $ | (39 | )
Corporate debt securities |  | 72,824 |  |  |  | (387 | ) |  |  | — |  |  |  | — |  |  |  | 72,824 |  |  |  | (387 | )
Total available-for-sale securities | $ | 89,738 |  |  | $ | (426 | ) |  | $ | — |  |  | $ | — |  |  | $ | 89,738 |  |  | $ | (426 | )
| December 31, 2017 |
| Less than 12 Months |  |  | 12 Months or Greater |  |  | Total |
| Fair Value |  |  | Unrealized Loss |  |  | Fair Value |  |  | Unrealized Loss |  |  | Fair Value |  |  | Unrealized Loss |
United States government agency securities | $ | 8,729 |  |  | $ | (24 | ) |  | $ | — |  |  | $ | — |  |  | $ | 8,729 |  |  | $ | (24 | )
Corporate debt securities |  | 35,785 |  |  |  | (73 | ) |  |  | — |  |  |  | — |  |  |  | 35,785 |  |  |  | (73 | )
Total available-for-sale securities | $ | 44,514 |  |  | $ | (97 | ) |  | $ | — |  |  | $ | — |  |  | $ | 44,514 |  |  | $ | (97 | )
Fair Values of Financial Assets and Liabilities | The fair values of the Company’s financial assets and liabilities were determined using the following inputs at March 31, 2018 (in thousands):
|  | Balance sheet |  |  |  |  |  | Quoted Prices in Active Markets for Identical Assets |  |  | Significant Other Observable Inputs |  |  | Significant Unobservable Inputs |
|  | classification |  | Total |  |  | (Level 1) |  |  | (Level 2) |  |  | (Level 3) |
Money market funds |  | Cash and cash equivalents |  | $ | 2,487 |  |  | $ | 2,487 |  |  | $ | — |  |  | $ | — |
United States government agency securities |  | Short-term investments |  |  | 16,914 |  |  |  | — |  |  |  | 16,914 |  |  |  | — |
Corporate debt securities |  | Short-term investments |  |  | 74,074 |  |  |  | — |  |  |  | 74,074 |  |  |  | — |
Total financial assets |  |  |  | $ | 93,475 |  |  | $ | 2,487 |  |  | $ | 90,988 |  |  | $ | — |
The fair values of the Company’s financial assets and liabilities were determined using the following inputs at December 31, 2017 (in thousands):
|  | Balance sheet |  |  |  |  |  | Quoted Prices in Active Markets for Identical Assets |  |  | Significant Other Observable Inputs |  |  | Significant Unobservable Inputs |
|  | classification |  | Total |  |  | (Level 1) |  |  | (Level 2) |  |  | (Level 3) |
Money market funds |  | Cash and cash equivalents |  | $ | 3,758 |  |  | $ | 3,758 |  |  | $ | — |  |  | $ | — |
United States government agency securities |  | Short-term investments |  |  | 11,228 |  |  |  | — |  |  |  | 11,228 |  |  |  | — |
Corporate debt securities |  | Short-term investments |  |  | 35,785 |  |  |  | — |  |  |  | 35,785 |  |  |  | — |
Total financial assets |  |  |  | $ | 50,771 |  |  | $ | 3,758 |  |  | $ | 47,013 |  |  | $ | — |

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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 3 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19279-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 5: 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=66048111&loc=SL7498348-110258 Reference 6: 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=66048111&loc=d3e19190-110258 + Details
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