Fair Value of Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2018

Fair Value Disclosures [Abstract]

Schedule of Company's Classified Assets Measured at Fair Value on Recurring Basis

the Company has classified assets measured at fair value on a recurring basis as follows (in thousands):

	Fair Value Measurements at Reporting Date Using
	December 31,		Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs
Description	2018		(Level 1)		(Level 2)		(Level 3)
Money market funds (included in cash and cash equivalents)	$	265	$	265	$	—	$	—
Corporate debt securities (included in short-term investments)		107,505		—		107,505		—
U.S. government agency securities and treasuries (included in short-term investments)		3,972		1,987		1,985		—
Total	$	111,742	$	2,252	$	109,490	$	—
	Fair Value Measurements at Reporting Date Using
	December 31,		Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs
Description	2017		(Level 1)		(Level 2)		(Level 3)
Money market funds (included in cash and cash equivalents)	$	21,301	$	21,301	$	—	$	—
Corporate debt securities (included in cash and cash equivalents)		11,405		—		11,405		—
Corporate debt securities (included in short-term investments)		28,585		—		28,585		—
Total	$	61,291	$	21,301	$	39,990	$	—