Basis of Presentation and Significant Accounting Policies (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cash and cash equivalents, fair value disclosure	$ 96,661,000	$ 123,420,000
Goodwill impairment	0	0	$ 0
Long-lived assets impairment	0	0	$ 0
Accounting Standards Update 2018-07
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment due to adoption of ASU 2018-07				$ 161,000
Commercial Paper
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cash and cash equivalents, fair value disclosure	2,401,000	299,000
Fair Value, Inputs, Level 1
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cash and cash equivalents, fair value disclosure	96,661,000	123,420,000
Fair Value, Inputs, Level 1 | Commercial Paper
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cash and cash equivalents, fair value disclosure	$ 2,401,000	$ 299,000
Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Useful life (years)	2 years
Average amortization period	2 years
Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Useful life (years)	12 years
Average amortization period	5 years