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Fair Value of Financial Instruments | 3 Months Ended
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Mar. 31, 2018
Fair Value of Financial Instruments [Abstract] |
Fair Value of Financial Instruments | 5. Fair Value of Financial Instruments Items measured at fair value on a recurring basis are short-term investments. The following table sets forth the Company’s financial instruments that were measured at fair value on a recurring basis by level within the fair value hierarchy:
|  | Fair Value Measurements as of March 31, 2018 Using: |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Assets: |  |  |  |  |  |  |  |  |  |  |  |
Money market mutual funds (included in cash and cash equivalents) |  | $ | 79,910 |  |  | $ | - |  |  | $ | - |  |  | $ | 79,910 |
Certificates of deposit |  | $ | 1,546 |  |  | $ | - |  |  | $ | - |  |  | $ | 1,546 |
United States Treasury securities |  |  | 10,015 |  |  |  | - |  |  |  | - |  |  |  | 10,015 |
Short-term investments |  |  | 11,561 |  |  |  | - |  |  |  | - |  |  |  | 11,561 |
|  | $ | 91,471 |  |  | $ | - |  |  | $ | - |  |  | $ | 91,471 |
The Company classifies its money market mutual funds as Level 1 assets under the fair value hierarchy, as these assets have been valued using quoted market prices in active markets without any valuation adjustment.

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- Definition The entire disclosure of the fair value measurement of assets and liabilities, which includes financial instruments measured at fair value that are classified in shareholders' equity, which may be measured on a recurring or nonrecurring basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -URI http://asc.fasb.org/topic&trid=2155941 + Details
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