Cash Equivalents and Investments (Tables)

9 Months Ended

Sep. 30, 2017

Cash And Cash Equivalents [Abstract]

Schedule of Fair Value of Securities, not Including Cash

The fair value of securities, not including cash at September 30, 2017 and December 31, 2016, were as follows (in thousands):

	September 30, 2017
	Amortized		Gross Unrealized					Estimated
	Cost		Gains		Losses			Fair Value
Money market funds	$	5,722	$	—	$	—		$	5,722
U.S. government securities		35,942		1		(26	)		35,917
Corporate notes		15,669		1		(4	)		15,666
Commercial paper		48,130		—		—			48,130
Total available-for-sale securities	$	105,463	$	2	$	(30	)	$	105,435
Classified as:
Cash equivalents								$	18,418
Short-term investments									87,017
Total cash equivalents and investments								$	105,435

	December 31, 2016
	Amortized		Gross Unrealized					Estimated
	Cost		Gains		Losses			Fair Value
Money market funds	$	45,937	$	—	$	—		$	45,937
U.S. government securities		16,479		11		—			16,490
Corporate notes		23,947		—		(20	)		23,927
Commercial paper		24,971		—		—			24,971
Total available-for-sale securities	$	111,334	$	11	$	(20	)	$	111,325
Classified as:
Cash equivalents								$	45,937
Short-term investments									54,407
Long-term investments									10,981
Total cash equivalents and investments								$	111,325

Schedule of Fair Value of Short-term and Long-term Marketable Securities Classified by Maturity

As the carrying value approximates the fair value for the Company’s cash equivalents, short-term and long-term investments shown in the tables above, the following table summarizes the fair value of the Company’s cash equivalents, short-term and long-term investments classified by maturity (in thousands):

	September 30,		December 31,
	2017		2016
Due within one year	$	105,435	$	100,344
Due after one year through three years		—		10,981
Total available-for-sale marketable debt securities	$	105,435	$	111,325

- Definition

Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities.

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