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Financial Instruments | 12 Months Ended
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Dec. 31, 2017
Investments All Other Investments [Abstract] |
Financial Instruments |
4. | Financial Instruments
Cash equivalents, restricted cash and short-term investments which are classified as available-for-sale securities, consisted of the following (in thousands):
December 31, 2017 |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Estimated Fair Value |
Money market funds |  | $ | 14,334 |  |  | $ | — |  |  | $ | — |  |  | $ | 14,334 |
U.S. government agency securities |  |  | 16,474 |  |  |  | — |  |  |  | (3 | ) |  |  | 16,471 |
Restricted cash (money market funds) |  |  | 5,330 |  |  |  | 3 |  |  |  | — |  |  |  | 5,333 |
Agency securities |  |  | 1,500 |  |  |  | — |  |  |  | — |  |  |  | 1,500 |
Total financial assets |  | $ | 37,638 |  |  | $ | 3 |  |  | $ | (3 | ) |  | $ | 37,638 |
Classified as: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 14,334 |
Short-term investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 17,971 |
Restricted cash (money market funds) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,333 |
|  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 37,638 |
December 31, 2016 |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Estimated Fair Value |
Money market funds |  | $ | 10,156 |  |  | $ | — |  |  | $ | — |  |  | $ | 10,156 |
U.S. government agency securities |  |  | 6,802 |  |  |  | — |  |  |  | (2 | ) |  |  | 6,800 |
Restricted cash (money market funds) |  |  | 19,593 |  |  |  | — |  |  |  | — |  |  |  | 19,593 |
Total financial assets |  | $ | 36,551 |  |  | $ | — |  |  | $ | (2 | ) |  | $ | 36,549 |
Classified as: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 10,156 |
Restricted cash (money market funds) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 19,593 |
Short-term investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,800 |
|  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 36,549 |
As of December 31, 2017, the remaining contractual maturities of available-for-sale securities was less than one year. There have been no material realized gains or losses on available-for-sale securities for the periods presented. The carrying amounts of cash, accounts receivable, other receivables, accounts payable, other payables and redeemable convertible notes approximate their fair values due to the short-term maturity of these instruments.

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- Definition The entire disclosure for financial instruments. This disclosure includes, but is not limited to, fair value measurements of short and long term marketable securities, international currencies forward contracts, and auction rate securities. Financial instruments may include hedging and non-hedging currency exchange instruments, derivatives, securitizations and securities available for sale at fair value. Also included are investment results, realized and unrealized gains and losses as well as impairments and risk management disclosures. + References No definition available. + Details
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- References No definition available. + Details
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