Consolidated Statements of Stockholders' Equity (USD $) In Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]
Balance at Dec. 31, 2014	$ 121,789us-gaap_StockholdersEquity	$ 63	$ 257,642	$ (135,916)
Balance, Shares at Dec. 31, 2014		63,183
Stock-based compensation	899		899
Issuance of common stock, net of issuance costs	1,783	1	1,782
Issuance of common stock, net of issuance costs, Shares		733
Exercise of stock options	196		196
Exercise of stock options, Shares		562
Net loss	(10,120)us-gaap_NetIncomeLoss			(10,120)
Balance at Mar. 31, 2015	$ 114,547us-gaap_StockholdersEquity	$ 64	$ 260,519	$ (146,036)
Balance, Shares at Mar. 31, 2015		64,478

This element represents the amount of recognized equity-based compensation during the period, that is, the amount recognized as expense in the income statement (or as asset if compensation is capitalized). Alternate captions include the words "stock-based compensation".

+ References+ Details

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References+ Details

- Definition

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

+ References+ Details

- Definition

Number of share options (or share units) exercised during the current period.

+ References+ Details