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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- Definition

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

Number of Offerings

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- Definition

Offering Share Amount Maximum

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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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- Definition

Number of shares into which the share instrument may be converted.

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- Definition

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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- 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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- 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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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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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		12 Months Ended
	Aug. 18, 2017 USD ($)	Sep. 30, 2018 USD ($) $ / shares shares	Feb. 28, 2018 USD ($) $ / shares shares	Mar. 31, 2019 USD ($) item $ / shares shares	Mar. 31, 2018 USD ($) shares	Dec. 31, 2018 USD ($) $ / shares item shares	Jan. 31, 2019 shares
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
Proceeds from issuance of common stock from underwritten public equity offering, net of issuance costs \| $					$ 32,986
Number of equity compensation plans \| item				3
Share-based compensation expense \| $				$ 4,381	$ 5,282
2010 Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock reserved for issuance \| shares							7,500,000
ESPP [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares issued \| shares				1,306,329	1,113,790
Common stock reserved for issuance \| shares				3,651,066			3,000,000
Underwritten Public Equity Offering [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares authorized, underwriting agreement \| shares		14,117,647	12,500,000
Common Stock, par value \| $ / shares		$ 0.001	$ 0.001
Common stock offering price per share \| $ / shares		$ 4.25	$ 2.40
Option to purchase additional shares, period		30 days	30 days
Additional shares authorized, underwriting agreement \| shares		2,117,647	1,875,000
Shares issued \| shares		16,200,000	14,400,000			30,600,000
Price per share \| $ / shares		$ 4.25	$ 2.40			$ 3.38
Commissions, percentage of gross proceeds		6.00%	4.00%
Proceeds from issuance of common stock from underwritten public equity offering, net of issuance costs \| $		$ 64,900	$ 33,100			$ 97,500
Other accrued offering expenses \| $		$ 200	$ 300
Holders may elect to receive net proceeds from financing activities, percentage						25.00%
Number of offerings \| item						2
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 \| $				$ 658	$ 19
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]
Ratio of number of shares into which the share instrument may be converted \| shares				1
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 \| $				$ 7	$ 90