Capital Stock - Series C Preferred Stock Transactions - Additional Information (Detail) - $ / shares |
3 Months Ended | 6 Months Ended | 12 Months Ended | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Sep. 10, 2014 |
Aug. 06, 2014 |
Jun. 26, 2014 |
May. 29, 2014 |
Mar. 12, 2013 |
Jan. 22, 2013 |
Mar. 09, 2012 |
Sep. 23, 2008 |
Aug. 20, 2008 |
Jun. 30, 2015 |
Jun. 30, 2015 |
[1] | Dec. 31, 2014 |
Dec. 31, 2013 |
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| Class of Stock [Line Items] | |||||||||||||||||
| Number of shares of common stock sold | 29,630 | 40,000 | 36,667 | 22,223 | 33,334 | 67,500 | |||||||||||
| Sales price per share | $ 0.09 | $ 0.10 | |||||||||||||||
| Convertible preferred stock, conversion price | $ 60.00 | ||||||||||||||||
| Common Stock [Member] | |||||||||||||||||
| Class of Stock [Line Items] | |||||||||||||||||
| Number of shares of common stock sold | 184,000 | [1] | 37,991,000 | ||||||||||||||
| Issuance of common stock from conversion of Series C preferred stock, shares | 8,000,000 | 162,000 | 162,000 | 60,000 | [1] | 8,000,000 | |||||||||||
| Series C Preferred Stock [Member] | |||||||||||||||||
| Class of Stock [Line Items] | |||||||||||||||||
| Number of shares of common stock sold | 1,300,000 | 700,000 | |||||||||||||||
| Sales price per share | $ 1.00 | ||||||||||||||||
| Convertible preferred stock, conversion price | $ 0.25 | ||||||||||||||||
| Preferred stock, shares issued | 0 | 0 | |||||||||||||||
| Preferred stock, shares outstanding | 0 | 0 | |||||||||||||||
| Convertible shares of common stock | $ 0.25 | ||||||||||||||||
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