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Stockholders' Equity
 12 Months Ended
Dec. 31, 2016
Stockholders Equity Note [Abstract]  
Stockholders' Equity

11.

Stockholders’ Equity

Preferred Stock

We have authorized 5 million shares of $0.001 par value preferred stock. Our Board of Directors is authorized to designate the terms and conditions of any preferred stock we issue without further action by the common stockholders.  There were 13,500 shares of Series A 3.6% Convertible Preferred Stock that had been issued at December 31, 2016 and 2015, none of which were outstanding as of either date.

All outstanding shares of the Series A 3.6% Convertible Preferred Stock were converted into common stock during the fourth quarter of 2014 and the first quarter of 2015 at the option of the holders. The fair value of the common stock into which the Series A 3.6% Convertible Preferred Stock was convertible on the date of issuance exceeded the proceeds allocated to the preferred stock, resulting in the beneficial conversion feature that we recognized as a dividend to the preferred stockholders and, accordingly, an adjustment to net loss to arrive at net loss allocable to common stockholders.  Certain shares of Series A 3.6% Convertible Preferred Stock were not convertible until stockholder approval, which occurred in January 2015.  As a result, a dividend for the beneficial conversion feature of $0.7 million was recorded during the quarter ended March 31, 2015.

In connection with the 3.6% Convertible Preferred Stock outstanding at December 31, 2014, we declared a cash dividend of $0.07 million. The cash dividend was paid in January and April 2015.

Common Stock

In May 2015, the Company entered into a Securities Purchase Agreement with certain institutional investors pursuant to which the Company agreed to sell up to $25.0 million of units, with each unit consisting of one share of its common stock and one warrant to purchase one share of its common stock, in a registered direct offering.  The purchase and sale of the units took place in two separate closings.  At the initial closing, which took place on May 8, 2015, the Company received approximately $17.4 million in net proceeds from the sale of units. The second closing occurred on August 27, 2015 upon satisfaction of certain conditions, including, without limitation, stockholder vote, and the Company received approximately $2.1 million in net proceeds from the sale of 500,000 units of the 1,000,000 units available for sale at the second closing.

On December 17, 2015, the Company and the holders of October 2014 warrants agreed to amend the October 2014 Warrants pursuant to an Amendment to Common Stock Purchase Warrant (the “2014 Amendment”). Also on December 17, 2015, the Company and the holders of the May 2015 Warrants and the August 2015 Warrants (collectively the “2015 Warrants”) agreed to amend the 2015 Warrants pursuant to an Amendment to Series A-1 Warrant to Purchase Common Stock and Amendment to Series A-2 Warrant to Purchase Common Stock, respectively (the “2015 Amendment” and, together with the 2014 Amendment, the “Warrant Amendments”). The Warrant Amendments provided that the holders may exercise their warrants on a “cashless exercise” basis in whole on or prior to December 31, 2015, whereby each exercising holder of the amended 2015 Warrants would receive 0.75 shares for each warrant share exercised and each exercising holder of the amended 2014 Warrants would receive 0.69 shares for each warrant share exercised. In addition, the Warrant Amendments removed certain provisions which provided that the exercise price of the Warrants would be reset in the event of certain equity issuances by the Company for a price below the exercise price of the Warrants at the time of such issuance. All 2014 Warrants and all 2015 Warrants were cashless exercised on or before December 31, 2015.

During 2016, we sold 1,840,982 shares of our common stock under an at-the-market offering program (“ATM”), receiving total net proceeds of approximately $4.4 million. During 2015, we sold 5,800,000 shares of our common stock under the ATM program, receiving total net proceeds of approximately $7.2 million.

Pursuant to a registration statement on Form S-1, originally filed on April 6, 2016, as amended, and declared effective by the SEC on May 26, 2016, and related prospectus (as supplemented), the Company registered, offered and sold to its participating stockholders of record as of the announced May 20, 2016 record date, one non-transferable subscription right for each share of common stock held by each stockholder as of the record date. Each right entitled the holder thereof to purchase one unit at the subscription price of $2.55 per unit, composed of one share of common stock and 0.5 of a warrant, with each whole warrant exercisable to purchase one share of common stock at an exercise price of $3.06 per share for 30 months from the date of issuance.  Pursuant to the Rights Offering, which closed on June 15, 2016, the Company sold an aggregate of 6,704,852 units, resulting in total net proceeds to the Company of $15.3 million, respectively.  The warrants issued pursuant to the Rights Offering are currently listed on NASDAQ under the symbol “CTYXW.”  Based on the relevant authoritative accounting guidance, the warrants were equity classified at the issuance date. Upon notice to the warrant holders, the warrants may be redeemed by the Company at $0.01 per warrant prior to their expiration and exercise if the Company’s common stock closes above $7.65 per share for 10 consecutive trading days.

On December 22, 2016, we entered into the Lincoln Park Purchase Agreement pursuant to which we have the right to sell to Lincoln Park and Lincoln Park is obligated to purchase up to $20.0 million in amounts of shares, of our common stock, over the 30-month period commencing on the date that a registration statement, which we filed with the SEC in December 2016. We may direct Lincoln Park, at its sole discretion and subject to certain conditions, to purchase up to 100,000 shares of common stock on any business day but in no event will the amount of a single Regular Purchase (as defined in the Lincoln Park Purchase Agreement) exceed $1.0 million. The purchase price of shares of common stock related to the Regular Purchases will be based on the prevailing market prices of such shares at the time of sales. Our sales of shares of common stock to Lincoln Park under the Lincoln Park Purchase Agreement are limited to no more than the number of shares that would result in the beneficial ownership by Lincoln Park and its affiliates, at any single point in time, of more than 9.99% of the then outstanding shares of the common stock. There are no trading volume requirements or restrictions under the Lincoln Park Purchase Agreement. There is no upper limit on the price per share that Lincoln Park must pay for common stock under a Regular Purchase or an accelerated purchase and in no event will shares be sold to Lincoln Park on a day our closing price is less than the floor price of $0.50 per share as set forth in the Purchase Agreement. On December 22, 2016, we issued to Lincoln Park 127,419 shares of common stock with a market value on the date of issuance of approximately $0.2 million as commitment shares in consideration for entering into the Lincoln Park Purchase Agreement. We will issue up to an additional 382,258 shares of common stock on a pro rata basis to Lincoln Park only as and when shares are sold under the Lincoln Park Purchase Agreement to Lincoln Park. To date, we have sold no shares under the Lincoln Park Purchase Agreement with Lincoln Park.