FAIR VALUE MEASUREMENTS (Tables)

12 Months Ended

Dec. 31, 2016

Fair Value Disclosures [Abstract]

Fair Value, Assets Measured on Recurring Basis

The following table summarizes the assets and liabilities measured at fair value on a recurring basis (in thousands):

	December 31, 2016
	Total		Level 1		Level 2		Level 3
Assets
Cash and cash equivalents:
Cash	$	2,728	$	2,728	$	—	$	—
Money market funds	19,655		19,655		—		—
Total cash and cash equivalents	22,383		22,383		—		—
Short-term investments:
Corporate debt securities	20,619		—		20,619		—
Commercial paper	13,732		—		13,732		—
Total short-term investments	34,351		—		34,351		—
Total	$	56,734	$	22,383	$	34,351	$	—

	December 31, 2015
	Total		Level 1		Level 2		Level 3
Assets
Cash and cash equivalents:
Cash	$	875	$	875	$	—	$	—
Money market funds	18,875		18,875		—		—
Corporate debt securities	6,749		—		6,749		—
Commercial paper	22,994		—		22,994
Total cash and cash equivalents	49,493		19,750		29,743		—
Short-term investments:
Corporate debt securities	27,622		—		27,622		—
Commercial paper	45,212		—		45,212		—
Total short-term investments	72,834		—		72,834		—
Total	$	122,327	$	19,750	$	102,577	$	—