Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2015

Fair Value Disclosures [Abstract]

Financial Instruments Measured at Fair Value on Recurring Basis

The following table sets forth the Company’s financial instruments that were measured at fair value on a recurring basis by level within the fair value hierarchy (in thousands):

	Fair Value Measurements at December 31, 2015
	Total		Level 1		Level 2		Level 3
Assets
Money market funds	$	132,647	$	132,647	$	—	$	—
	Fair Value Measurements at December 31, 2014
	Total		Level 1		Level 2		Level 3
Assets
Money market funds	$	160,125	$	160,125	$	—	$	—

Summary of Changes in Fair Value of Financial Instruments

The following table sets forth a summary of the changes in the fair value of the Company’s Level 3 financial instruments as follows:

	Convertible			Convertible
	preferred stock			preferred stock
	call option			warrant
	liability			liability
Balance at January 1, 2014	$	21		$	474
Change in fair value recorded in other income (expense), net		9,560			2,278
Conversion of preferred stock into common stock and reclassification to permanent equity		(9,581	)		(2,752	)
Balance at December 31, 2014	$	—		$	—