Balance Sheet Details - Schedule of Short-Term Investments (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
Jun. 30, 2020	Dec. 31, 2019
Schedule Of Available For Sale Securities [Line Items]
Amortized Costs	$ 12,991	$ 15,522
Gross Unrealized Gains	14	5
Gross Unrealized Losses	(1)
Estimated Fair Value	$ 13,004	$ 15,527
Commercial Paper
Schedule Of Available For Sale Securities [Line Items]
Maturity	1 year or less	1 year or less
Amortized Costs	$ 9,100	$ 10,903
Gross Unrealized Gains	11	3
Gross Unrealized Losses	(1)
Estimated Fair Value	$ 9,110	$ 10,906
Corporate Debt Securities
Schedule Of Available For Sale Securities [Line Items]
Maturity	1 year or less	1 year or less
Amortized Costs	$ 2,888	$ 3,370
Gross Unrealized Gains		1
Estimated Fair Value	$ 2,888	$ 3,371
U.S. Treasury Securities
Schedule Of Available For Sale Securities [Line Items]
Maturity	1 year or less	1 year or less
Amortized Costs	$ 1,003	$ 1,249
Gross Unrealized Gains	3	1
Estimated Fair Value	$ 1,006	$ 1,250

Investment maturity period.

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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