Refers to percentage of fair market value of common stock.

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Refers to period for exercising vested option extended after termination or the expiration date of the option.

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Refers to period of nontransferable for stock option granted.,

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Refers to the maximum period for options exercises in period.

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Refers to the maximum period for options grants in period.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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

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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 options awarded to employees as compensation.

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- References

No definition available.

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- Definition

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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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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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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No definition available.

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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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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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Weighted average price of options that were either forfeited or expired.

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

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Number of options outstanding, including both vested and non-vested options.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

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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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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Number of non-vested options outstanding.

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Number of non-vested options forfeited.

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Number of increase (decrease) of non-vested options.

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Number of options vested.

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Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

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Number of share options (or share units) exercised during the current period.

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Stock-based Compensation (Details) - USD ($)	12 Months Ended
Stock-based Compensation (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Aug. 29, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of ownership interest				51.20%
Share-based Compensation [Abstract]
Share-based compensation expense	$ 1,630,000	$ 922,000	$ 1,815,000
Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares authorized (in shares)	5,200,000
Maximum period for options grants in period	10 years
Maximum period for options exercises in period	10 years
Period for exercising vested option	12 months
Shares Available for Grant [Roll Forward]
Beginning of the period (in shares)	880,000	1,757,000
Increase in pool (in shares)	1,200,000
Options granted (in shares)	(896,000)	(962,000)
Options exercised (in shares)	0	0
Options forfeited, cancelled or expired (in shares)	200,000	85,000
End of the period (in shares)	1,384,000	880,000	1,757,000
Number of Options Outstanding [Roll Forward]
Beginning of the period (in shares)	3,017,000	2,240,000
Option granted (in shares)	896,000	962,000
Options exercised (in shares)	(323,000)	(100,000)
Options forfeited, cancelled or expired (in shares)	(200,000)	(85,000)
End of the period (in shares)	3,390,000	3,017,000	2,240,000
Exercisable (in shares)	1,835,000
Weighted Average Exercise Price [Roll Forward]
Beginning of the period (in dollars per share)	$ 2.52	$ 2.03
Option granted (in dollars per share)	5.17	3.58
Options exercised (in dollars per share)	1.89	2.19
Options forfeited, cancelled or expired (in dollars per share)	3.11	2.00
End of the period (in dollars per share)	3.25	$ 2.52	$ 2.03
Exercisable (in dollars per share)	$ 2.48
Total unrecognized compensation costs	$ 1,600,000	$ 2,700,000
Weighted average recognition period	2 years 6 months	2 years 4 months 24 days
Share-based Compensation [Abstract]
Share-based compensation expense	$ 1,630,000	$ 922,000	$ 1,815,000
Weighted-average assumptions [Abstract]
Expected life	6 years 1 month 24 days	6 years 2 months 16 days	6 years 9 months 29 days
Risk-free interest rates	2.03%	1.46%	1.87%
Volatility	66.01%	64.64%	74.15%
Dividend yield	0.00%	0.00%	0.00%
Stock Option Plan [Member] \| Research and Development [Member]
Share-based Compensation [Abstract]
Share-based compensation expense	$ 668,000	$ 312,000	$ 456,000
Stock Option Plan [Member] \| General and Administrative [Member]
Share-based Compensation [Abstract]
Share-based compensation expense	841,000	610,000	1,359,000
Stock Option Plan [Member] \| Sales and Marketing [Member]
Share-based Compensation [Abstract]
Share-based compensation expense	$ 121,000	$ 0	$ 0
Stock Option Plan [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of ownership interest	10.00%
Percentage of fair market value of common stock	110.00%
Stock Option Plan [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Term of options	5 years
Aggregate fair value of common stock	$ 100,000
Period of nontransferable for stock option grants	3 months