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

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Number of additional shares authorized for issuance under share-based payment arrangement.

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- Definition

Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Stockholders' Equity - Equity Incentive Plans (Details) - USD ($) $ in Thousands		3 Months Ended
	Dec. 15, 2016	Mar. 31, 2020	Mar. 31, 2019
Equity Incentive Plans
Stock-based compensation		$ 891	$ 754
Research and Development Expense
Equity Incentive Plans
Stock-based compensation		209	232
General and Administrative Expense
Equity Incentive Plans
Stock-based compensation		$ 682	$ 522
Maximum
Equity Incentive Plans
Term of award		10 years
Vesting period		4 years
2008 Plan and 2013 Plan
Equity Incentive Plans
Authorized (in shares)	500,000