Cash Equivalents and Investments (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Marketable Securities [Line Items]
Amortized Cost	$ 69,705	$ 57,436
Gains	106	21
Losses	(44)	0
Credit Losses	0
Fair Value	69,767	57,457
Cash equivalents
Marketable Securities [Line Items]
Fair Value	32,090	5,381
Short term investments
Marketable Securities [Line Items]
Fair Value	35,957	42,829
Long term investments
Marketable Securities [Line Items]
Fair Value	1,720	9,247
Money market funds
Marketable Securities [Line Items]
Amortized Cost	32,089	5,381
Gains	0	0
Losses	0	0
Credit Losses	0
Fair Value	32,089	5,381
Commercial paper
Marketable Securities [Line Items]
Amortized Cost	7,061	11,892
Gains	0	0
Losses	0	0
Credit Losses	0
Fair Value	7,061	11,892
Corporate notes
Marketable Securities [Line Items]
Amortized Cost	14,466	18,369
Gains	0	11
Losses	(44)	0
Credit Losses	0
Fair Value	14,422	18,380
U.S. government securities
Marketable Securities [Line Items]
Amortized Cost	7,786	11,291
Gains	103	4
Losses	0	0
Credit Losses	0
Fair Value	7,889	11,295
U.S. asset-backed securities
Marketable Securities [Line Items]
Amortized Cost	8,303	10,503
Gains	3	6
Losses	0	0
Credit Losses	0
Fair Value	$ 8,306	$ 10,509

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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