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Stock-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended
	May 31, 2017	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Share-based Compensation [Abstract]
Withholding taxes paid on shares issued upon conversion of RSUs				$ 33	$ 29
Stock-based compensation expense				2,008	1,715
General and Administrative Expense [Member]
Share-based Compensation [Abstract]
Stock-based compensation expense		$ 467	$ 442	855	834
Research and Development Expense [Member]
Share-based Compensation [Abstract]
Stock-based compensation expense		$ 655	$ 440	$ 1,154	$ 881
Stock Options [Member]
Share-based Compensation [Abstract]
Options granted (in shares)		336,000	331,000	1,006,000	356,000
Options granted, weighted average grant date fair value (in dollars per share)		$ 2.31	$ 2.72	$ 2.52	$ 2.65
Dividend yield				0.00%	0.00%
Expected stock price volatility				85.00%	84.00%
Risk-free interest rate				2.65%	1.94%
Expected option term				6 years	6 years
Unrecognized stock-based compensation expense expected to be recognized related to non-vested stock options		$ 7,160		$ 7,160
Weighted average amortization period				3 years 29 days
Options exercised (in shares)				0
Restricted Stock Units (RSUs) [Member]
Share-based Compensation [Abstract]
RSUs granted (in shares)		223,997	220,664	243,997	220,664
Weighted average grant date fair value of RSU's granted (in dollars per share)		$ 3.19	$ 3.83	$ 3.28	$ 3.83
Withholding taxes paid on shares issued upon conversion of RSUs		$ 33	$ 29	$ 33	$ 29
Unrecognized stock-based compensation expense expected to be recognized related to non-vested RSUs		$ 2,001		$ 2,001
Weighted average amortization period				2 years 8 months 19 days
New shares of common stock issued as a result of vesting RSUs (in shares)				168,219
2013 Plan [Member]
Share-based Compensation [Abstract]
Additional shares authorized for issuance (in shares)	2,500,000
Shares authorized for issuance (in shares)		16,624,469		16,624,469
Shares available for grant (in shares)		1,780,315		1,780,315

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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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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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Amount of cash outflow to satisfy an employee's income tax withholding obligation as part of a net-share settlement of a share-based award.

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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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The weighted average fair value at grant date for nonvested equity-based awards issued 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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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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Number of additional shares authorized for issuance under an established share-based compensation plan.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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Gross number of share options (or share units) granted during the period.

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Number of share instruments newly issued under a share-based compensation plan.

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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