The Business and Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2019

Accounting Policies [Abstract]

Assets and Liabilities Measured at Fair Value on a Recurring Basis

Below is a table that presents information about certain assets measured at fair value on a recurring basis (in thousands): 

			Fair Value Measurements
			December 31, 2019
	Total		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Cash equivalents
Money market funds	$	11,854	$	11,854	$	—	$	—
Total cash equivalents	11,854		11,854		—		—
Short-term investments
U.S. Treasury securities	22,493		22,493		—		—
Commercial paper	43,119		—		43,119		—
Corporate bonds	30,962		—		30,962		—
Total short-term investments	96,574		22,493		74,081		—
Total assets	$	108,428	$	34,347	$	74,081	$	—

			Fair Value Measurements
			December 31, 2018
	Total		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Cash equivalents
Money market funds	$	30,726	$	30,726	$	—	$	—
U.S. Treasury securities	11,482		11,482		—		—
Commercial paper	29,677		—		29,677		—
Corporate bonds	4,008		—		4,008		—
Total cash equivalents	75,893		42,208		33,685		—
Short-term investments
U.S. Treasury securities	12,589		12,589		—		—
Common stock of U.S. corporation	38		38		—		—
Commercial paper	60,114		—		60,114		—
Corporate bonds	32,683		—		32,683		—
Total short-term investments	105,424		12,627		92,797		—
Total assets	$	181,317	$	54,835	$	126,482	$	—

Schedule of Prepaid and Other Current Assets

Prepaid expenses and other current assets consisted of the following (in thousands):

	December 31,
	2019		2018
Prepaid research and development expenses	$	936	$	1,071
Interest receivable	323		259
Prepaid insurance	344		382
Other prepaid expenses and current assets	1,782		886
Total prepaid expenses and other current assets	$	3,385	$	2,598

Schedule of Accrued Liabilities

Accrued liabilities consisted of the following (in thousands):

	December 31,
	2019		2018
Accrued compensation	$	3,626	$	2,469
Accrued research and development expenses	1,868		4,525
Other accrued liabilities	1,336		1,281
Total accrued liabilities	$	6,830	$	8,275