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Stockholders' Equity - Stock-based Compensation Expense (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Stock-based compensation expense
Total stock based compensation expense	$ 268,000	$ 177,000
Options vested, fair value	24,333	34,929
Research and Development Expense
Stock-based compensation expense
Total stock based compensation expense	40,000	77,000
Selling, general and administrative expense
Stock-based compensation expense
Total stock based compensation expense	228,000	$ 100,000
Options to purchase Common Stock
Stock-based compensation expense
Unrecognized compensation cost	$ 1,200,000
Weighted-average remaining vesting period for recognition	1 year 9 months 18 days
Options outstanding, weighted average contractual life	8 years 7 months 6 days

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- Definition

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

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