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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) - $ / shares | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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Minimum [Member] |  |  |
Stock issued for cash, net (in dollars per share) | $ 3.00 | $ 4.00 | $ 3.00
Maximum [Member] |  |  |
Stock issued for cash, net (in dollars per share) | $ 4.89 | $ 5.69 | $ 5.05

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- Definition Per share or per unit amount of equity securities issued. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |