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Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2017

Fair Value Disclosures [Abstract]

Schedule of Assets and Liabilities Measured on Recurring Basis

The following table presents information about our assets that are measured at fair value on a recurring basis using the above input categories (in thousands):


						Fair Value Measurements as of December 31, 2017																		Fair Value Measurements as of December 31, 2016
Description						Total						Level 1						Level 2						Total						Level 1						Level 2
Money market funds						$	49,452					$	49,452					$	—					$	43,496					$	43,496					$	—
U.S. treasury debt securities						3,075						—						3,075						3,498						—						3,498
U.S. corporate debt securities						13,289						—						13,289						7,937						—						7,937
						$	65,816					$	49,452					$	16,364					$	54,931					$	43,496					$	11,435

Included in cash and cash equivalents						$	49,452																	$	43,496
Included in marketable securities						$	16,364																	$	11,435

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.

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