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Summary of Significant Accounting Policies - Stock-Based Compensation (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Stock Incentive Plans
Stock-based compensation expense	$ 1,512,000	$ 1,771,000
Tax benefits recognized from stock-based compensation expense	0	0
Research and development
Stock Incentive Plans
Stock-based compensation expense	616,000	673,000
General and administrative
Stock Incentive Plans
Stock-based compensation expense	$ 896,000	$ 1,098,000

X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901

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