Additional Common Stock, Shares Authorized, Underwriting Agreement

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- Definition

Amount of Common Stock, Preferred Stock, Depository Shares, Warrants, Units or Debt Securities Available in Future Public Offerings

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Common Stock, Preferred Stock, Depository Shares, Warrants, Units or Debt Securities Available in Future Public Offerings, Period from Effective Date

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- Definition

Common Stock, Shares Authorized, Underwriting Agreement

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- Definition

Debt Agreement, Holders Entitled To Net Proceeds From Financing Activities, Percentage

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- Definition

Option to Purchase Additional Common Stock, Underwriting Agreement, Period

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- Definition

Percentage Commission Of Gross Proceeds On Sale Of Common Stock

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- Definition

The cash inflow from the additional capital contribution to the entity, net of issuance costs.

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- Definition

Share Based Compensation Arrangements By Share Based Payment Awards Number Of Active Plans

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Face amount or stated value per share of common stock.

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- Definition

Amount of expenses incurred but not yet paid classified as other, due within one year or the normal operating cycle, if longer.

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

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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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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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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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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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Percentage of vesting of share-based compensation awards.

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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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Stockholders' Equity (Narrative) (Details) $ / shares in Units, $ in Thousands		1 Months Ended		3 Months Ended	9 Months Ended
	Aug. 18, 2017	Sep. 30, 2018 USD ($) item $ / shares shares	Feb. 28, 2018 USD ($) $ / shares shares	Sep. 30, 2018 USD ($) item $ / shares shares	Sep. 30, 2018 USD ($) item $ / shares shares	Sep. 30, 2017 USD ($) shares	Jan. 31, 2018 shares	Dec. 31, 2017 $ / shares	Aug. 31, 2017 USD ($)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Amount of common stock, preferred stock, depositiry shares, warrants, units or debt securities available in future public offerings \| $									$ 150,000
Common stock, preferred stock, depositiry shares, warrants, units or debt securities available in future public offerings, period from effective date	3 years
Common Stock, par value \| $ / shares		$ 0.001		$ 0.001	$ 0.001			$ 0.001
Number of equity compensation plans \| item		3		3	3
Share-based compensation expense \| $					$ 15,631	$ 14,962
Proceeds from issuance of common stock from equity plans \| $					$ 4,181	$ 8,818
Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Holders may elect to receive net proceeds from financing activities, percentage					25.00%
2010 Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock reserved for issuance \| shares							5,800,000
2010 Director Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock reserved for issuance \| shares							1,200,000
ESPP [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares issued \| shares					1,674,960	1,289,663
Common stock reserved for issuance \| shares		1,952,507		1,952,507	1,952,507		2,300,000
Underwriting Agreement [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares authorized, underwriting agreement \| shares			12,500,000
Common Stock, par value \| $ / shares			$ 0.001
Option to purchase additional shares, period			30 days
Additional shares authorized, underwriting agreement \| shares			1,875,000
Shares issued \| shares			14,400,000
Price per share \| $ / shares			$ 2.40
Commissions, percentage of gross proceeds			4.00%
Proceeds from issuance of common stock from equity offering, net of issuance costs \| $			$ 33,100
Other accrued offering expenses \| $			$ 300
At the Market Offering [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Proceeds from issuance of common stock from equity offering, net of issuance costs \| $						$ 11,865
Underwritten Public Equity Offering [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares authorized, underwriting agreement \| shares		14,117,647		14,117,647	14,117,647
Common Stock, par value \| $ / shares		$ 0.001		$ 0.001	$ 0.001
Option to purchase additional shares, period		30 days
Additional shares authorized, underwriting agreement \| shares		2,117,647		2,117,647	2,117,647
Shares issued \| shares		16,200,000			30,600,000
Price per share \| $ / shares		$ 4.25		$ 4.25	$ 4.25
Commissions, percentage of gross proceeds		6.00%
Proceeds from issuance of common stock from equity offering, net of issuance costs \| $		$ 64,900			$ 97,722	$ 52,530
Other accrued offering expenses \| $		$ 200		$ 200	$ 200
Time-Based Restricted Stock Units (RSUs) [Member] \| 2010 Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period					4 years
Share-based compensation expense \| $				55	$ 128
Time-Based Restricted Stock Units (RSUs) [Member] \| 2010 Plan [Member] \| Share-based Compensation Award, Tranche One, Two, Three and Four [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting percentage					25.00%
Performance-Based Restricted Stock Units (RSUs) [Member] \| 2010 Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation expense \| $				$ 178	$ 430