Cash, Cash Equivalents and Investments (Tables)

3 Months Ended

Mar. 31, 2017

Cash And Cash Equivalents [Abstract]

Summary of Amortized Cost, Gross Unrealized Gains and Losses, and Estimated Fair Market Value of Cash and Cash Equivalents and Available-for-Sale Investments

The following tables present the amortized cost, gross unrealized gains and losses, and fair value of our cash and cash equivalents and available-for-sale investments as of the dates presented (in thousands):

	March 31, 2017
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Cash	$	2,448	$	—	$	—		$	2,448
Cash equivalents:
Money market funds		1,364		—		—			1,364
U.S. government agency securities		2,496		—		—			2,496
Commercial paper		999		—		—			999
Short-term investments:
U.S. government agency securities		48,913		—		(28	)		48,885
Corporate notes and bonds		19,733		1		(9	)		19,725
Commercial paper		7,625		—		—			7,625
Total assets measured at fairvalue	$	83,578	$	1	$	(37	)	$	83,542

	December 31, 2016
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Cash	$	10,667	$	—	$	—		$	10,667
Cash equivalents:
Money market funds		14,065		—		—			14,065
U.S. government agency securities		4,996		1		—			4,997
Corporate notes and bonds		959		—		—			959
Commercial paper		2,948		—		—			2,948
Short-term investments:
U.S. government agency securities		36,535		6		(10	)		36,531
Corporate notes and bonds		19,259		2		(9	)		19,252
Commercial paper		11,122		—		—			11,122
Total assets measured at fairvalue	$	100,551	$	9	$	(19	)	$	100,541