Stockholders' Equity	12 Months Ended
Dec. 31, 2017
Equity [Abstract]
STOCKHOLDERS' EQUITY	6. STOCKHOLDERS’ EQUITY Common stock On April 19, 2017, the Company received a staff determination letter from the Listing Qualifications Department of NASDAQ informing the Company that it has failed to regain compliance with the minimum bid price requirement set forth in Listing Rule 5550(a) (2), and that the Company’s common stock would be delisted from the NASDAQ Capital Market at the opening of business on April 28, 2017 unless the Company timely requested an appeal of this determination. On April 26, 2017, the Company submitted an appeal requesting a hearing before a NASDAQ listing qualifications panel. With completion of the reverse stock split (described below) the Company’s shares began trading above the required $1.00 per share closing bid price. On May 19, 2017, the Company received notification from NASDAQ that the bid price deficiency had been cured and the Company is considered in compliance with all applicable listing standards. At the Company’s annual meeting of stockholders held on May 3, 2017, the Company’s stockholders approved, (i) an amendment to the Company’s Eighth Amended and Restated Certificate of Incorporation (as amended, the “Certificate of Incorporation”) to effect a reverse stock split of the Company’s common stock in a range of 1-for-10 to 1-for-20, such ratio to be determined in the sole discretion of the Board; and (ii) an amendment to the Certificate of Incorporation to decrease the Company’s authorized number of shares of common stock to three times the number of shares of the Company’s common stock outstanding immediately following the reverse stock split, rounded up to the nearest 100,000 shares. On May 3, 2017, following the annual meeting, the Board determined to effect the reverse stock split at a ratio of 1-for-10, and the Company filed with the Secretary of State of the State of Delaware a Certificate of Amendment to (a) implement the reverse stock split and (b) to reduce the number of authorized shares of common stock from 40,000,000 to 8,200,000, consequently reducing the number of total authorized shares from 45,000,000 to 13,200,000. The amendment, reverse stock split and reduction in authorized shares were effective on May 5, 2017. As a result of the reverse stock split, every 10 shares of issued and outstanding common stock were automatically combined into one issued and outstanding share of common stock. Following the amendment to the Certificate of Incorporation, the Company has a total of 13,200,000 authorized shares, comprised of (i) 8,200,000 shares of common stock and (ii) 5,000,000 shares of preferred stock. Stockholders received cash in lieu of any fractional shares resulting from the reverse stock split in a proportionate amount equal to $0.78 per pre-split share based on the average closing price of the Common Stock for the 30 trading days immediately preceding the effective date of the reverse stock split. The Company’s consolidated financial statements, related notes and other financial data contained in this report have been adjusted to give the retroactive effect to the decreased authorization and reverse stock split for all periods presented. Common shares reserved As of December 31, 2017, the Company had reserved 147,948 shares of common stock for issuance upon the exercise of outstanding common stock options and vesting of restricted stock units. Also 274,494 shares of the Company’s common stock were reserved for future grants of stock options and restricted stock units (or other similar equity instruments) under the Rubicon Technology, Inc. 2016 Stock Incentive Plan (the “2016 Plan”) as of December 31, 2017.

Stockholders' Equity

12 Months Ended

Dec. 31, 2017

6. STOCKHOLDERS’ EQUITY

Common stock

On April 19, 2017, the Company received a staff determination letter from the Listing Qualifications Department of NASDAQ informing the Company that it has failed to regain compliance with the minimum bid price requirement set forth in Listing Rule 5550(a) (2), and that the Company’s common stock would be delisted from the NASDAQ Capital Market at the opening of business on April 28, 2017 unless the Company timely requested an appeal of this determination. On April 26, 2017, the Company submitted an appeal requesting a hearing before a NASDAQ listing qualifications panel. With completion of the reverse stock split (described below) the Company’s shares began trading above the required $1.00 per share closing bid price. On May 19, 2017, the Company received notification from NASDAQ that the bid price deficiency had been cured and the Company is considered in compliance with all applicable listing standards.

At the Company’s annual meeting of stockholders held on May 3, 2017, the Company’s stockholders approved, (i) an amendment to the Company’s Eighth Amended and Restated Certificate of Incorporation (as amended, the “Certificate of Incorporation”) to effect a reverse stock split of the Company’s common stock in a range of 1-for-10 to 1-for-20, such ratio to be determined in the sole discretion of the Board; and (ii) an amendment to the Certificate of Incorporation to decrease the Company’s authorized number of shares of common stock to three times the number of shares of the Company’s common stock outstanding immediately following the reverse stock split, rounded up to the nearest 100,000 shares. On May 3, 2017, following the annual meeting, the Board determined to effect the reverse stock split at a ratio of 1-for-10, and the Company filed with the Secretary of State of the State of Delaware a Certificate of Amendment to (a) implement the reverse stock split and (b) to reduce the number of authorized shares of common stock from 40,000,000 to 8,200,000, consequently reducing the number of total authorized shares from 45,000,000 to 13,200,000. The amendment, reverse stock split and reduction in authorized shares were effective on May 5, 2017.

As a result of the reverse stock split, every 10 shares of issued and outstanding common stock were automatically combined into one issued and outstanding share of common stock. Following the amendment to the Certificate of Incorporation, the Company has a total of 13,200,000 authorized shares, comprised of (i) 8,200,000 shares of common stock and (ii) 5,000,000 shares of preferred stock.

Stockholders received cash in lieu of any fractional shares resulting from the reverse stock split in a proportionate amount equal to $0.78 per pre-split share based on the average closing price of the Common Stock for the 30 trading days immediately preceding the effective date of the reverse stock split.

The Company’s consolidated financial statements, related notes and other financial data contained in this report have been adjusted to give the retroactive effect to the decreased authorization and reverse stock split for all periods presented.

Common shares reserved

As of December 31, 2017, the Company had reserved 147,948 shares of common stock for issuance upon the exercise of outstanding common stock options and vesting of restricted stock units. Also 274,494 shares of the Company’s common stock were reserved for future grants of stock options and restricted stock units (or other similar equity instruments) under the Rubicon Technology, Inc. 2016 Stock Incentive Plan (the “2016 Plan”) as of December 31, 2017.