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Common Stock	6 Months Ended
	Jun. 30, 2017
Stockholders' Equity Note [Abstract]
Common Stock	Common Stock The Company’s common stock has the following characteristics: • The holders of shares of common stock are entitled to one vote for each share of common stock held at all meetings of stockholders.  • The holders of shares of common stock are entitled to receive dividends, if and when declared by the Company’s board of directors. Since inception, no cash dividends have been declared. Offerings In September 2015, the Company and the Cancer Prevention and Research Institute of Texas (“CPRIT”) entered into a grant contract, effective as of June 1, 2014 (the "2014 Contract"), in connection with an award of approximately $16.8 million. The award was in the form of an agreement by CPRIT to purchase $16.8 million of shares of common stock of the Company in a private placement concurrent with the initial public offering of the Company’s common stock. On October 5, 2015, CPRIT purchased 2,395,010 shares of the Company’s common stock at $7.00 per share.  Net proceeds from the private placement, after related transaction offering costs, were approximately $16.6 million.  In October 2015, the Company issued 6.25 million shares of common stock in an underwritten public offering, with a price of $7.00 per share.  The underwriters purchased an additional 704,962 shares of the Company's common stock pursuant to their option to purchase additional shares.  The Company received aggregate net proceeds of approximately $43.7 million in the public offering, after deducting the underwriting discounts and commissions and estimated offering expenses payable by the Company.

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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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-URI http://asc.fasb.org/topic&trid=2208762

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