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Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2019

Fair Value Disclosures [Abstract]

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis

We measure cash, cash equivalents and short-term investments at fair value on a recurring basis. The fair values of such assets were as follows (in thousands):

						Fair Value Measurements at Reporting Date Using
		Balance at September 30, 2019				Quoted Prices in Active Markets for Identical Assets (Level 1)				Significant Other Observable Inputs (Level 2)				Significant Unobservable Inputs (Level 3)
Cash and money market funds		$	48,315			$	48,315			$	—			$	—
U.S. treasury bills and government agency obligations			69,759				69,759				—				—
U.S. corporate debt securities			33,900				—				33,900				—
Foreign corporate debt securities			10,688				—				10,688				—
U.S. commercial paper			32,368				—				32,368				—
Foreign commercial paper			61,248				—				61,248				—
Total		$	256,278			$	118,074			$	138,204			$	—

						Fair Value Measurements at Reporting Date Using
		Balance at December 31, 2018				Quoted Prices in Active Markets for Identical Assets (Level 1)				Significant Other Observable Inputs (Level 2)				Significant Unobservable Inputs (Level 3)
Cash and money market funds		$	22,751			$	22,751			$	—			$	—
U.S. treasury bills and government agency obligations			59,741				59,741				—				—
U.S. corporate debt securities			59,087				—				59,087				—
Foreign corporate debt securities			5,046				—				5,046				—
U.S. commercial paper			61,885				—				61,885				—
Foreign commercial paper			123,861				—				123,861				—
Total		$	332,371			$	82,492			$	249,879			$	—