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Cash, Cash Equivalents and Marketable Securities | 9 Months Ended
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Sep. 30, 2017
Cash, Cash Equivalents and Marketable Securities | 6. Cash, Cash Equivalents and Marketable Securities At September 30, 2017, the Company did not have any marketable securities. As of December 31, 2016, the Company’s investments included money market funds and short-term marketable securities. These marketable securities were classified as available-for-sale. Marketable securities are investments with original maturities of greater than 90 days. Long-term marketable securities are securities with maturities of greater than one year. Investments in marketable securities consisted of the following at December 31, 2016 (in thousands):
|  | December 31, 2016 |
|  | Amortized Cost |  |  | Gross Unrealized Gain |  |  | Gross Unrealized Loss |  |  | Fair Value |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government and agency securities |  | $ | 807 |  |  | $ | — |  |  | $ | — |  |  | $ | 807 |
Corporate and other debt securities |  |  | 18,745 |  |  |  | 2 |  |  |  | (7 | ) |  |  | 18,740 |
Total |  | $ | 19,552 |  |  | $ | 2 |  |  | $ | (7 | ) |  | $ | 19,547 |
There were no long-term marketable securities as of December 31, 2016. Management reviewed the Company’s investments as of December 31, 2016 and concluded that there are no securities with other than temporary impairments in the investment portfolio. The Company did not intend to sell any investments in an unrealized loss position, and it was not more likely than not that the Company will be required to sell the investments before recovery of their amortized cost bases.

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- Definition The entire disclosure of cash, cash equivalents, and debt and equity securities, including any unrealized or realized gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 305 -URI http://asc.fasb.org/topic&trid=2122426 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 + Details
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