Number Of Semi-Annual Vesting Installments

No definition available.

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- Definition

Share based compensation expense related to nonemployee stock options and restricted stock awards.

+ References

No definition available.

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- Definition

Aggregate number of common shares reserved for future issuance.

+ References

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- Definition

Unrecognized cost of unvested share-based compensation awards.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
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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.

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- Definition

The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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-Publisher FASB
-Name Accounting Standards Codification
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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.

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-Publisher FASB
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-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.

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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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).

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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).

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- Definition

Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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-Paragraph 2
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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.

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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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-Paragraph 2
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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.

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- Definition

The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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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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- Definition

Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest exercisable or convertible options. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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- Definition

Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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- Definition

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

+ References

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- Definition

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

+ References

No definition available.

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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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- Definition

Number of non-vested options outstanding.

+ References

No definition available.

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- Definition

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Share-Based Compensation - Additional Information (Detail)	1 Months Ended		12 Months Ended
	May 31, 2017	Mar. 31, 2017 installment $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2017 USD ($) $ / shares shares	Sep. 30, 2015 shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation expense \| $			$ 6,369,000	$ 5,746,000
Unrecognized compensation cost \| $			$ 7,800,000
Recognition period			1 year 9 months 29 days
Tax benefits attributed to share-based compensation expense \| $			$ 0	0
Shares of common stock reserved for future issuance (in shares)			19,398,000
Compensation expense related to nonemployee stock options and restricted stock awards \| $			$ 6,000	$ (8,000)
2007 Equity Incentive Stock Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares authorized for issuance (in shares)			11,600,000.0
Shares available for future grants (in shares)			2,800,000
Employee stock purchase plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares of common stock reserved for future issuance (in shares)			178,000
Options \| Chief Executive Officer
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares of common stock reserved for future issuance (in shares)			1,120,000
Options expiration period		10 years
Options granted in period (in shares)		1,200,000.0
Exercise price of options granted (in USD per share) \| $ / shares		$ 4.24
Number semi-annual vesting installments \| installment		6
Vesting period		3 years
Options \| Chief Executive Officer \| Stock Option Plan, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options granted in period (in shares)		80,000
Employee stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares of common stock reserved for future issuance (in shares)					200,000
Employee stock \| Employee stock purchase plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares of common stock reserved for future issuance (in shares)			200,000
Shares authorized for issuance (in shares)			200,000.0
Shares issued in period (in shares)			5,000	4,000
Vested Restricted Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Repurchased shares of common stock (in shares)			5,800	21,000
Repurchased shares of common stock \| $			$ 21,000	$ 100,000
Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation expense \| $			$ 6,267,000	$ 4,731,000
Weighted average exercise price of options exercisable (in USD per share) \| $ / shares			$ 5.49	$ 9.83
Weighted average fair value of options granted (in USD per share) \| $ / shares			$ 2.09	2.47
Options vested or expected to vest (in shares)			6,321,000
Weighted average exercise price, vested or expected to vest (in USD per share) \| $ / shares			$ 4.32
Exercise price of options granted (in USD per share) \| $ / shares			$ 3.04	$ 3.68
Options \| 2007 Equity Incentive Stock Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options expiration period	10 years
Performance-based options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options vested or expected to vest (in shares)			715,000
Weighted average exercise price, vested or expected to vest (in USD per share) \| $ / shares			$ 2.18
Restricted stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation expense \| $			$ 102,000	$ 1,015,000
Shares issued in period (in shares)			0	2,000
Weighted average fair value of restricted shares issued (in USD per share) \| $ / shares			$ 0.00	$ 5.78
Restricted shares, cancelled (in shares)			15,000	39,000
Total fair value of vested restricted stock awards \| $			$ 100,000	$ 300,000
Restricted stock units (RSUs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares issued in period (in shares)			0	20,000
Weighted average fair value of restricted shares issued (in USD per share) \| $ / shares			$ 0.00	$ 4.97
Restricted shares, cancelled (in shares)			0	0
Total fair value of vested restricted stock awards \| $			$ 100,000	$ 800,000
Nonemployee Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unvested options to acquire shares of common stock, outstanding (in shares)			12,000	4,000