Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2019

Fair Value Disclosures [Abstract]

Summary of Assets Measured at Fair Value on Recurring Basis

The following table presents the balances of assets measured at fair value on a recurring basis, by level within the fair value hierarchy, as of the dates presented (in thousands):

	March 31, 2019						December 31, 2018
	Level 1		Level 2		Total		Level 1		Level 2		Total
Cash equivalents:
Money market funds	$	8,196	$	—	$	8,196	$	11,896	$	—	$	11,896
Corporate notes and bonds		—		949		949		—		—		—
Commercial paper		—		2,890		2,890		—		—		—
Total cash equivalents		8,196		3,839		12,035		11,896		—		11,896
Short-term investments:
U.S. government agency securities		—		14,901		14,901		—		7,482		7,482
Corporate notes and bonds		—		4,686		4,686		—		3,736		3,736
Commercial paper		—		5,960		5,960		—		9,943		9,943
Treasury bills		—		12,439		12,439		—		17,382		17,382
Total short-term investments		—		37,986		37,986		—		38,543		38,543
Total	$	8,196	$	41,825	$	50,021	$	11,896	$	38,543	$	50,439