Fair value measurements

3 Months Ended

Mar. 31, 2018

Fair value measurements

Fair value measurements

4. Fair value measurements

The following table presents information about the Company's assets and liabilities regularly measured and carried at a fair value and indicates the level within fair value hierarchy of the valuation techniques utilized to determine such value as of March 31, 2018 and December 31, 2017:

					Significant
			Quoted Prices		Other		Significant
			in Active		Observable		Unobservable
	Fair		Markets		Inputs		Inputs
	Value		(Level 1)		(Level 2)		(Level 3)
March 31, 2018
Cash and cash equivalents	$	32,354	$	32,354	$	—	$	—
Marketable securities:
U.S. Treasuries		59,225		59,225		—		—
Commercial paper		9,989		—		9,989		—
Corporate bonds		6,391		—		6,391		—
	$	107,959	$	91,579	$	16,380	$	—

					Significant
			Quoted Prices		Other		Significant
			in Active		Observable		Unobservable
	Fair		Markets		Inputs		Inputs
	Value		(Level 1)		(Level 2)		(Level 3)
December 31, 2017
Cash and cash equivalents	$	26,591	$	26,591	$	—	$	—
Marketable securities:
U.S. Treasuries		62,640		62,640		—		—
Commercial paper		24,931		—		24,931		—
Corporate bonds		11,054		—		11,054		—
	$	125,216	$	89,231	$	35,985	$	—

There were no changes in valuation techniques or transfers between fair value measurement levels during the three months ended March 31, 2018 and 2017. As of March 31, 2018 and December 31, 2017, cash and cash equivalents were comprised of cash and money market funds.