Percent of Voting Interests

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock Above Minimum Threshold, Percent

+ References

No definition available.

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- Definition

Sharebased Compensation Arrangement By Sharebased Payment Award Award Future Vesting Rights Percentage

+ References

No definition available.

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Estimated Performance Goal Achievement Rate

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No definition available.

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Reduction of Share Reserve For Each Share Granted, Share

+ References

No definition available.

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- Definition

Share-based Goods and Nonemployee Services Transaction, Value of Securities Issued

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No definition available.

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

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

+ References

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- Definition

Unrecognized cost of unvested options awarded to employees as compensation.

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 2
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- Definition

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).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
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- Definition

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).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition

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.

+ References

No definition available.

+ Details

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- Definition

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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(3)
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- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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- Definition

Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 2
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- Definition

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

+ References

No definition available.

+ Details

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Paragraph 2
-Subparagraph (d)(1)
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- Definition

The number of shares or units of entity securities issued in the transaction in which equity securities were issued to pay for goods or nonemployee services.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 50
-Section 50
-Paragraph 1
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- Definition

Percentage of vesting of share-based compensation awards.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

Intrinsic value of equity-based compensation awards vested. Excludes stock and unit options.

+ References

No definition available.

+ Details

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(2)
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- Definition

Purchase price of common stock expressed as a percentage of its fair value.

+ References

No definition available.

+ Details

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Stock-based Compensation - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended		12 Months Ended
	Oct. 31, 2017	Mar. 31, 2010	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total shares remaining available for issuance (shares)			6,759,316
Vesting period of units granted			6 months
Share-based compensation			$ 7,091	$ 5,673	$ 5,126
Granted (shares)			856,000
Nonemployee services transaction, quantity of securities issued (shares)	11,100
Nonemployee services transaction, value of securities issued	$ 48
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of voting interests		10.00%
Purchase price of common stock when voting percent is above minimum threshold		110.00%
Expiration period		10 years
Vesting period of units granted		4 years
Weighted average grant date fair value (usd per share)			$ 2.51	$ 2.32	$ 2.09
Aggregate intrinsic value of options exercised			$ 200	$ 600	$ 400
Unrecognized compensation cost, options			$ 2,700
Weighted-average remaining amortization period (years)			2 years 7 months 6 days
Non-Statutory Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option price as a percent of common stock		85.00%
RSAs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average remaining amortization period (years)			6 months
Weighted average grant date fair value (usd per share)			$ 4.75	$ 4.21	$ 4.10
Equity instruments other than options, aggregate intrinsic value, vested			$ 1,000	$ 1,800	$ 2,300
Unrecognized compensation cost, awards other than options			$ 300
Granted (shares)			143,000
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average remaining amortization period (years)			1 year 6 months
Weighted average grant date fair value (usd per share)			$ 4.22	$ 4.10	$ 3.65
Equity instruments other than options, aggregate intrinsic value, vested			$ 1,300	$ 1,000	$ 2,900
Unrecognized compensation cost, awards other than options			$ 1,100
Granted (shares)			275,000
PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average remaining amortization period (years)			4 months 24 days
Weighted average grant date fair value (usd per share)			$ 4.25	$ 4.10	$ 3.45
Equity instruments other than options, aggregate intrinsic value, vested			$ 2,700	$ 1,800	$ 800
Unrecognized compensation cost, awards other than options			$ 400
Granted (shares)			276,000
Performance shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average remaining amortization period (years)			1 year 2 months 12 days
Weighted average grant date fair value (usd per share)			$ 2.54
Equity instruments other than options, aggregate intrinsic value, vested					$ 0
Unrecognized compensation cost, awards other than options			$ 1,100
Granted (shares)			1,720,000
2010 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares initially available for future issuance (shares)		1,100,000
Reduction of share reserve for each share granted (shares)		1
2016 PSU Plan \| Performance shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated performance goal achievement rate				142.30%	92.80%
Granted (shares)				0	0
Non-Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (shares)				0	0
Tranche One \| Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights percentage		25.00%
Tranche One \| RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of units granted		3 years
Tranche Two \| Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights percentage		75.00%
Tranche Two \| RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of units granted		4 years
Award vesting rights percentage		25.00%
Tranche Six \| 2016 PSU Plan \| Performance shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Future vesting rights percentage			50.00%
Tranche Six \| 2015 PSU Plan \| Performance shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Future vesting rights percentage			50.00%
Tranche Six \| 2017 PSU and PBO Plan \| PBOs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated performance goal achievement rate			134.20%