Additional Common Stock, Shares Authorized, Underwriting Agreement

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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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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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- Definition

The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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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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- 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

Percentage of vesting of share-based compensation awards.

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- Definition

Per share or per unit amount of equity securities issued.

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- Definition

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	6 Months Ended
	Aug. 18, 2017	Feb. 28, 2018 USD ($) $ / shares shares	Jun. 30, 2018 USD ($) item $ / shares shares	Jun. 30, 2018 USD ($) item $ / shares shares	Jun. 30, 2017 USD ($) shares	Jan. 31, 2018 shares	Dec. 31, 2017 $ / shares 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
Number of equity compensation plans \| item			3	3
Share-based compensation expense \| $				$ 10,506	$ 9,994
Proceeds from issuance of common stock from equity plans \| $				$ 2,517	$ 6,231
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				1,113,790	750,005
Common stock reserved for issuance \| shares			2,513,677	2,513,677		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]
Proceeds from issuance of common stock from equity offering, net of issuance costs \| $				$ 32,862	$ 52,709
Time-Based Restricted Stock Units (RSUs) [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Grant date fair value, price per share \| $ / shares			$ 2.57	$ 2.57
Number of unvested equity-based payment instruments \| shares			355,000	355,000
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 \| $			$ 54	$ 73
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]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Grant date fair value, price per share \| $ / shares			$ 2.58	$ 2.58
Number of unvested equity-based payment instruments \| shares			652,000	652,000
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 \| $			$ 162	$ 252