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Warrants - Additional Information (Detail) - USD ($) |  | 12 Months Ended
--- | --- | ---
Dec. 02, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Other Liabilities Disclosure [Abstract] |  |  |  |
Warrants to purchase common stock |  | 3,999,998 |  |
Purchase price per share |  | $ 0.0045 |  |
Warrants expiration duration |  | 8 years |  |
Expense recognized inclusive of accelerated expense for warrants performance criteria. |  | $ 348,000 | $ 0 | $ 0
Accelerated recognition of remaining warrant expense | $ 255,000 |  |  |

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- Definition Accelerated recognition of remaining warrant expense. + References No definition available. + Details
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- Definition Expense recognized for warrants performance criteria. + References No definition available. + Details
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Namespace Prefix: | snd_
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Balance Type: | debit
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- Definition Warrants expiration duration. + References No definition available. + Details
Name: | snd_WarrantsExpirationDuration
Namespace Prefix: | snd_
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Balance Type: | na
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- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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- References No definition available. + Details
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- Definition Per share or per unit amount of equity securities issued. + References No definition available. + Details
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