CASH, CASH EQUIVALENTS AND SHORT-TERM INVESTMENTS (Tables)

3 Months Ended

Mar. 31, 2019

Cash and Cash Equivalents [Abstract]

Summary of securities included in cash and cash equivalents and short-term investments

Securities classified as cash and cash equivalents and short-term investments as of March 31, 2019 and December 31, 2018 are summarized below (in thousands). Estimated fair value is based on quoted market prices for these investments.

March 31, 2019	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Cash and cash equivalents
Cash	$	94,311	$	—	$	—		$	94,311
Money market funds	41		—		—			41
Commercial paper	14,594		—		(3		)	14,591
U.S. Treasury Securities	748		—		—			748
Total cash and cash equivalents	$	109,694	$	—	$	(3	)	$	109,691

December 31, 2018	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Cash and cash equivalents
Cash	$	95,660	$	—	$	—	$	95,660
Money market funds	11		—		—		11
Agency bond	1,250		—		—		1,250
Commercial paper	14,028		—		—		14,028
Total cash and cash equivalents	$	110,949	$	—	$	—	$	110,949