Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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The cash inflow from the additional capital contribution to the entity.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Per share or per unit amount of equity securities issued.

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Number of new stock issued during the period.

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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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Stockholders' Equity - 2017 Public Offerings of Common Stock (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended		3 Months Ended		6 Months Ended
	Jan. 31, 2018	Aug. 31, 2017	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Sale of stock
Stock-based compensation expense			$ 987	$ 925	$ 2,106	$ 1,760
2017 Public Offering \| Common Stock
Sale of stock
Shares issued (in shares)		5,333,334
Share price (in dollars per share)		$ 3.75
Proceeds from the issuance of common stock, net		$ 18,500
2014 Equity Incentive Plan \| Performance-based vesting \| Executive officers
Sale of stock
Granted (in shares)	365,000
Stock-based compensation expense			$ 0		$ 0