Stockholders' Equity - Common Stock and Warrants (Details)
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1 Months Ended |
3 Months Ended |
12 Months Ended |
24 Months Ended |
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Apr. 12, 2017
USD ($)
$ / shares
shares
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Apr. 03, 2017
USD ($)
$ / shares
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Dec. 22, 2016
$ / shares
shares
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Mar. 31, 2019
USD ($)
$ / shares
shares
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Feb. 28, 2018
shares
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Mar. 31, 2019
USD ($)
item
$ / shares
shares
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Mar. 31, 2018
USD ($)
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Dec. 31, 2018
$ / shares
shares
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Dec. 31, 2017
$ / shares
shares
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Mar. 31, 2019
USD ($)
$ / shares
shares
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Jul. 20, 2017
$ / shares
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Dec. 31, 2016
$ / shares
shares
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| Stockholders' equity |
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| Preferred stock, Shares authorized | shares |
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5,000,000
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5,000,000
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5,000,000
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| Preferred stock, par value | $ / shares |
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$ 0.01
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$ 0.01
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$ 0.01
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| Common Stock Shares, Outstanding | shares |
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229,534,572
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229,534,572
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219,157,998
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229,534,572
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| Common Stock, par value (in dollars per share) | $ / shares |
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$ 0.01
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$ 0.01
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$ 0.01
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$ 0.01
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| Number of votes per share | item |
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1
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| Common stock shares issued | shares |
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10,000,000
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10,000,000
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| Par value, common stock | $ / shares |
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$ 0.01
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$ 0.01
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0.01
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0.01
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| Share price (in dollars per share) | $ / shares |
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$ 2.35
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$ 2.35
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2.35
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| Proceeds from public offerings, net of transaction costs | $ |
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$ 23,500,000
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$ 23,498,000
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| Exercise price of warrants (in dollars per share) | $ / shares |
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$ 2.1231
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| Proceeds from exercise of warrants, net of transaction costs | $ |
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$ 50,000
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| Value of shares issued | $ |
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$ 23,498,000
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| Series A Junior Participating Cumulative Preferred Stock |
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| Stockholders' equity |
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| Preferred stock, par value | $ / shares |
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$ 0.01
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$ 0.01
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$ 0.01
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$ 0.01
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| Common Stock Shares, Outstanding | shares |
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0
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0
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0
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0
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| At Market Issuance Sales Agreement |
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| Stockholders' equity |
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| Common Stock, par value (in dollars per share) | $ / shares |
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$ 0.01
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| Par value, common stock | $ / shares |
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$ 0.01
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| Authorized amount | $ |
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$ 75,000,000
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| Value of shares issued | $ |
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$ 30,200,000
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| Warrants issued in February, 2013 |
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| Stockholders' equity |
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| Exercise price of warrants (in dollars per share) | $ / shares |
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$ 0.15
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$ 0.15
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| Warrants outstanding (in shares) | shares |
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100
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100
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| Number of warrants exercised (in shares) | shares |
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100
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| Warrants issued in December 2016 |
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| Stockholders' equity |
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| Class of Warrant or Right Issued | shares |
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10,501,500
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| Exercise price of warrants (in dollars per share) | $ / shares |
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$ 1.50
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| Number of warrants exercised (in shares) | shares |
10,501,500
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| Proceeds from exercise of warrants, net of transaction costs | $ |
$ 15.10
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| Shares of common stock that can be purchased from warrants issued | shares |
5,250,750
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| Per share price of shares of common stock | $ / shares |
$ 2.69
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| Warrant Issued With Amazon And Walmart Stores Inc Transaction Agreement In 2017 |
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| Stockholders' equity |
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| Number of warrants exercised (in shares) | shares |
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18,913,869
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18,913,869
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| Warrant Issued With Amazon And Walmart Stores Inc Transaction Agreement In 2017 | Maximum |
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| Stockholders' equity |
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| Class of Warrant or Right Issued | shares |
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110,573,392
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