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Capital structure | 12 Months Ended
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Dec. 31, 2017
Stockholders' Equity Note [Abstract] |
Capital structure | Capital structure Common stock As of December 31, 2017, the Company’s number of authorized shares of common stock was 125,000,000. Warrants All of the Company’s outstanding warrants are classified as liabilities as of December 31, 2017 and 2016 because they contain non-standard antidilution provisions. The following is a summary of the Company’s outstanding warrants as of December 31, 2017:
|  | Warrant shares |  | Exercise price |  | Expiration
Common stock |  | 7,030 |  |  | $ | 128.00 |  |  | 2019
Common stock |  | 130 |  |  | $ | 2,520.00 |  |  | 2019
The following is a summary of the Company’s outstanding warrants as of December 31, 2016:
|  | Warrant shares |  | Exercise price |  | Expiration
Common stock |  | 6,250 |  |  | $ | 128.00 |  |  | 2017
Common stock |  | 7,030 |  |  | $ | 128.00 |  |  | 2019
Common stock |  | 130 |  |  | $ | 2,520.00 |  |  | 2019

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