Cash Equivalents and Marketable Securities (Tables)

9 Months Ended

Sep. 30, 2017

Investments Debt And Equity Securities [Abstract]

Schedule of Estimated Fair Value of Cash Equivalents and Marketable Securities

The following tables summarize the estimated fair value of the Company’s cash equivalents and marketable securities and the gross unrealized gains and losses (in thousands):

	September 30, 2017
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Cash equivalents:
Money market funds	$	3,959	$	—	$	—		$	3,959
Reverse repurchase agreements		7,250		—		—			7,250
Total cash equivalents		11,209		—		—			11,209
Marketable securities:
U.S. treasury securities		2,509				(2	)		2,507
U.S. government securities		40,110		—		(30	)		40,080
Total marketable securities	$	42,619	$	—	$	(32	)	$	42,587

	December 31, 2016
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Cash equivalents:
Money market funds	$	4,584	$	—	$	—		$	4,584
Reverse repurchase agreements		39,250		—		—			39,250
Total cash equivalents		43,834		—		—			43,834
Marketable securities:
U.S. government securities		15,758		—		(4	)		15,754
Total marketable securities	$	15,758	$	—	$	(4	)	$	15,754

Summary of Contractual Maturities of Marketable Securities at Estimated Fair Value

The following tables summarizes the contractual maturities of the Company’s marketable securities at estimated fair value (in thousands):

	September 30,		December 31,
	2017		2016
Due in one year or less	$	26,619	$	15,754
Due in 1 - 2 years		15,968		—
Total marketable securities	$	42,587	$	15,754