Cash, Cash Equivalents and Investments (Tables)

3 Months Ended

Mar. 31, 2019

Cash and Cash Equivalents [Abstract]

Schedule of Cash Equivalents and Investments Carried at Fair Value

The following table presents the cash equivalents and investments carried at fair value in accordance with the hierarchy defined in Note 2 (in thousands):

	Total		Quoted prices in active markets (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)
March 31, 2019
Money market funds, included in cash equivalents	$	5,730	$	5,730	$	—	$	—
Investments - U.S. treasuries	12,531		12,531		—		—
Investments - Asset-backed securities	7,230		—		7,230		—
Investments - Corporate bonds	38,924		—		38,924		—
Total	$	64,415	$	18,261	$	46,154	$	—
December 31, 2018
Money market funds, included in cash equivalents	$	7,791	$	7,791	$	—	$	—
Corporate bonds, included in cash equivalents	10,910		—		10,910		—
Investments - U.S. treasuries	7,518		7,518		—		—
Investments - Asset-backed securities	5,758		—		5,758		—
Investments - Corporate bonds	39,964		—		39,964		—
Total	$	71,941	$	15,309	$	56,632	$	—

Schedule of Cash Equivalents and Investments

Cash equivalents and investments at March 31, 2019 consist of the following (in thousands):

	Contractual maturity (in days)	Amortized Cost		Unrealized gains		Unrealized losses		Fair Value
Investments
U.S. treasuries	60-165	$	12,500	$	30	$	—	$	12,530
Asset-backed securities	106-169	7,207		23		—		7,230
Corporate bonds	1-194	38,787		138		—		38,925
Total		$	58,494	$	191	$	—	$	58,685