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Investments and Fair Value Measurements | 6 Months Ended
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Jun. 30, 2014
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Investments and Fair Value Measurements | 3. Investments and Fair Value Measurements The following table summarizes the Company’s held-to-maturity investments:
|  | June 30, 2014 |  |  | December 31, 2013 |
Federal agency debt instruments |  | $ | 12,145 |  |  | $ | 11,748 |
The following table summarizes unrealized gains, losses, and fair value of held-to-maturity investments:
|  | June 30, 2014 |  |  | December 31, 2013 |
Cost/amortized cost |  | $ | 12,145 |  |  | $ | 11,748 |
Gross unrealized gains |  |  | 64 |  |  |  | 20 |
Gross unrealized losses |  |  | (752 | ) |  |  | (1,459 | )
Fair value |  | $ | 11,457 |  |  | $ | 10,309 |
The following table sets forth the maturity profile of held-to-maturity investments; however, these investments may be called prior to their stated maturity date:
|  | June 30, 2014 |  |  | December 31, 2013 |
Due within one year |  | $ | — |  |  | $ | — |
Due one year through five years |  |  | — |  |  |  | — |
Due five years through ten years |  |  | 671 |  |  |  | 686 |
Due over ten years |  |  | 11,474 |  |  |  | 11,062 |
Total |  | $ | 12,145 |  |  | $ | 11,748 |
Fair Value Measurement Under the accounting for fair value measurements and disclosures, fair value is defined as the price that would be received to sell an asset or paid to transfer a liability, or the exit price, in an orderly transaction between market participants at the measurement date. The accounting guidance establishes a hierarchy of valuation techniques based on whether the inputs to those valuation techniques are observable or unobservable. Observable inputs reflect market data obtained from independent sources, while unobservable inputs reflect the Company’s market assumptions. These three types of inputs create the following fair value hierarchy: Level 1—Quoted prices for identical instruments in active markets. Level 2—Quoted prices for similar instruments in active markets; quoted prices for identical or similar instruments in markets that are not active; and model-derived valuations whose inputs are observable or whose significant value drivers are observable. Level 3—Instruments whose significant value drivers are unobservable. This hierarchy requires the use of observable market data when available. The Company’s held-to-maturity securities are categorized as Level 1. The Company does not intend to sell its held-to-maturity investments before the recovery of their amortized cost bases which may be at maturity. Some of our financial instruments are not measured at fair value on a recurring basis but are recorded at amounts that approximate fair value due to their liquid or short-term nature. Such financial assets and financial liabilities are categorized as Level 3.

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