Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2017

Schedule of Fair Value of Company's Financial Assets and Liabilities

The following table presents the fair value of the Company’s financial assets and liabilities determined using the inputs defined above (amounts in thousands).

	September 30, 2017
	Level 1		Level 2		Level 3		Total
Assets
Money market funds	$	5,722	$	—	$	—	$	5,722
U.S. government securities		—		35,917		—		35,917
Corporate notes		—		15,666		—		15,666
Commercial paper		—		48,130		—		48,130
Total	$	5,722	$	99,713	$	—	$	105,435

	December 31, 2016
	Level 1		Level 2		Level 3		Total
Assets
Money market funds	$	45,937	$	—	$	—	$	45,937
U.S. government securities		—		16,490		—		16,490
Corporate notes		—		23,927		—		23,927
Commercial paper		—		24,971		—		24,971
Total	$	45,937	$	65,388	$	—	$	111,325

Summary of Changes in Fair Value of Preferred Stock Warrants Classified as Level 3

The following table sets forth a summary of the changes in the fair value of the preferred stock warrants which is classified as Level 3 in the fair value hierarchy.

	Nine Months Ended September 30, 2017		Nine Months Ended September 30, 2016
Beginning balance	$	—	$	2,949
Total change in fair value recorded as other expense, net		—		996
Ending balance	$	—	$	3,945

- Definition

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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