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Private Placement | 12 Months Ended
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Dec. 31, 2018
Equity [Abstract] |
Private Placement | Stockholders’ Equity Preferred Stock The Company has a total of 2,000,000 shares of preferred stock authorized for issuance at a par value of $0.001 per share, 150,000 of which have been designated Series D Preferred Stock. No preferred shares are currently issued or outstanding. Rights Agreement On January 22, 2018, the Company entered into the Rights Agreement and issued a dividend of one preferred share purchase right (a “Right”) to each of the stockholders of record of each share of common stock outstanding on February 2, 2018. Each Right entitles the registered holder to purchase from the Company one one-thousandth of a share of Series D Preferred Stock, par value $0.001 per share (the “Preferred Shares”), of the Company, at a price of $10.00 per one one-thousandth of a Preferred Share represented by a Right (the “Purchase Price”), subject to adjustment. The description and terms of the Rights are set forth in the Rights Agreement. The Rights are not exercisable until the Distribution Date (as defined in the Rights Agreement). The Rights will expire on the earlier of (i) the close of business on January 22, 2021, (ii) the time at which the Rights are redeemed, and (iii) the time at which the Rights are exchanged. Until a Right is exercised, the holder thereof, as such, will have no rights as a stockholder of the Company, including, without limitation, the right to vote or to receive dividends. Common Shares Reserved for Future Issuance The Company had reserved shares of common stock for possible future issuance as of December 31, 2018 and 2017 as follows:
| December 31,
| 2018 |  | 2017
Common stock warrants outstanding | 5,815,283 |  |  | 1,886,630 |
Stock options outstanding | 8,796,212 |  |  | 6,566,483 |
Restricted stock units outstanding | 454,382 |  |  | 1,055,977 |
Shares available for issuance pursuant to Convertible Notes | 40,649,225 |  |  | 40,649,225 |
Shares available for future grants of awards under the 2015 Incentive Compensation Plan | 1,943,085 |  |  | 1,973,537 |
Shares available for future grants of awards under the 2018 Omnibus Incentive Compensation Plan | 3,224,425 |  |  | 3,816,243 |
Shares available under the 2000 Employee Stock Purchase Plan | 825,537 |  |  | 857,638 |
Total shares of common stock reserved for issuance | 61,708,149 |  |  | 56,805,733 |
Private Placement On August 6, 2018, the Company completed a private placement of 12,062,000 shares of its common stock and warrants to purchase an additional 4,221,700 shares of its common stock, subject to adjustment for stock splits, reverse stock splits, stock dividends and similar transactions, to certain accredited investors for gross proceeds of $19.7 million in cash. Each warrant has an initial exercise price of $2.52 per share, subject to adjustment for stock splits, reverse stock splits, stock dividends and similar transactions, and will expire on August 6, 2023. The warrants may be exercisable on a cashless exercise basis if, and only if, the shares of common stock underlying such warrants cannot be immediately resold pursuant to an effective registration statement or Rule 144 of the Securities Act of 1933, as amended, without volume or manner of sale restrictions. In connection with the private placement, the Company incurred issuance costs of approximately $0.5 million. The Company assessed the terms of the warrants under ASC 815, Derivatives and Hedges. Pursuant to this guidance, the Company has determined that the warrants do not require liability accounting and has classified the warrants as equity.

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- Definition The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI http://asc.fasb.org/topic&trid=2208762 + Details
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