Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2018

Fair Value Disclosures [Abstract]

Assets and Liabilities Measured at Fair Value on Recurring Basis

Assets and liabilities measured at fair value on a recurring basis were as follows (in thousands):

	December 31, 2018
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Direct or Indirect Observable Inputs (Level 2)		Total
Assets
Cash equivalents:
Money market funds	$	1,277	$	-	$	1,277
Corporate commercial paper		-		1,198		1,198
Corporate debt		-		750		750
Total cash equivalents		1,277		1,948		3,225
Restricted cash:
Money market funds		526				526
Short-term investments:
Corporate commercial paper		-		3,874		3,874
Corporate debt		-		2,535		2,535
Total short-term investments		-		6,409		6,409
Total assets measured at fair value	$	1,803	$	8,357	$	10,160
	December 31, 2017
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Direct or Indirect Observable Inputs (Level 2)		Total
Assets
Cash equivalents:
Money market funds	$	2,274	$	-	$	2,274
Corporate commercial paper		-		3,245		3,245
Corporate debt		-		1,000		1,000
Total cash equivalents		2,274		4,245		6,519
Short-term investments:
Corporate commercial paper		-		5,480		5,480
Corporate debt		-		6,415		6,415
Total short-term investments		-		11,895		11,895
Total assets measured at fair value	$	2,274	$	16,140	$	18,414