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Cash and Cash Equivalents and Investments (Tables)

9 Months Ended

Sep. 30, 2020

Cash and Cash Equivalents and Investments [Abstract]

Schedule of Cash, Cash Equivalents and Short-term Investments [Table Text Block]

						As of September 30, 2020
						Amortized Cost						Gross Unrealized Gains						Gross Unrealized Losses						Estimated Fair Value
						(in thousands)
Cash and cash equivalents						$	52,251					$	—					$	—					$	52,251
Securities maturing within one year:
U.S. treasury securities						38,796						40						—						38,836
Corporate debt securities						20,364						1						(6)						20,359
Total short-term investments						$	59,160					$	41					$	(6)					$	59,195
Total cash and cash equivalents and investments						$	111,411					$	41					$	(6)					$	111,446
						As of December 31, 2019
						Amortized Cost						Gross Unrealized Gains						Gross Unrealized Losses						Estimated Fair Value
												(in thousands)
Cash and cash equivalents						$	36,112					$	—					$	—					$	36,112
Securities maturing within one year:
U.S. treasury securities						235,463						94						(10)						235,547
Total short-term investments						$	235,463					$	94					$	(10)					$	235,547
Total cash and cash equivalents and investments						$	271,575					$	94					$	(10)					$	271,659

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Cash and Cash Equivalents and Investments [Abstract]

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Tabular disclosure of the components of cash, cash equivalents, and investments.

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