Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2016

Fair Value Disclosures [Abstract]

Summary of Assets Measured at Fair Value on Recurring Basis

The following tables present the balances of assets measured at fair value on a recurring basis, by level within the fair value hierarchy, as of December 31, 2016, all such balances as of December 31, 2015 were $0:

	DECEMBER 31, 2016
	LEVEL 1		LEVEL 2		LEVEL 3
	(in thousands)
Cash equivalents:
Money market funds	$	14,065	$	—	$	—
U.S. government agency securities		—		4,997		—
Corporate notes and bonds		—		959		—
Commercial Paper		—		2,948		—
Short-term investments:
U.S. government agency securities		—		36,531		—
Corporate notes and bonds		—		19,252		—
Commercial Paper		—		11,122		—
Total assets measured at fairvalue	$	14,065	$	75,809	$	—

Summary of Liabilities Measured at Fair Value on Recurring Basis

The following table presents the balances of liabilities measured at fair value on a recurring basis, by level within the fair value hierarchy, as of December 31, 2015, all such balances as of December 31, 2016 were $0:

	DECEMBER 31, 2015
	LEVEL 1		LEVEL 2		LEVEL 3
	(in thousands)
Convertible preferred stock warrants	$	—	$	—	$	2,865
Total liabilities measured at fair value	$	—	$	—	$	2,865

Roll-Forward of Fair Value of Preferred Stock Warrant Liabilities Categorized as Level 3

The following table provides a roll-forward of the fair value of the preferred stock warrant liabilities categorized as Level 3 for the years ended December 31, 2016 and 2015 (in thousands):

Balance at December 31, 2013	$	3,170
Remeasurement of convertible preferred stock warrants		398
Balance at December 31, 2014	$	3,568
Remeasurement of convertible preferred stock warrants		(703	)
Balance at December 31, 2015		2,865
Remeasurement of convertible preferred stock warrants		(559	)
Exercise of preferred stock warrants		(1,801	)
Conversion of preferred stock warrants into common stock warrants at initial public offering		(505	)
Balance at December 31, 2016	$	—