Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2019

Fair Value Disclosures [Abstract]

Assets and Liabilities Measured at Fair Value on Recurring Basis

Assets measured at fair value on a recurring basis as of March 31, 2019 and December 31, 2018 are summarized below (in thousands):

	March 31, 2019						December 31, 2018
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Direct or Indirect Observable Inputs (Level 2)		Total		Quoted Prices in Active Markets for Identical Assets (Level 1)		Direct or Indirect Observable Inputs (Level 2)		Total
Assets
Cash equivalents:
Money market funds	$	264	$	—	$	264	$	1,277	$	—	$	1,277
Government and agencies		—		500	$	500		—		—		—
Corporate commercial paper		—		749		749		—		1,198		1,198
Corporate debt		—		—		—		—		750		750
Total cash equivalents		264		1,249		1,513		1,277		1,948		3,225
Restricted cash:
Money market funds		601		—		601		526		—		526
Short-term investments:
Corporate commercial paper		—		5,276		5,276		—		3,874		3,874
Corporate debt		—		1,897		1,897		—		2,535		2,535
Total short-term investments		—		7,173		7,173		—		6,409		6,409
Total assets measured at fair value	$	865	$	8,422	$	9,287	$	1,803	$	8,357	$	10,160