XML 33 R21.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Warrants | 9 Months Ended
--- | ---
Sep. 30, 2017
Text Block [Abstract] |
Warrants | 15. Warrants Contemporaneous with the financing transaction in 2011 described in Note 13, the Company issued certain management stockholders warrants to purchase 3,999 shares of common stock for a purchase price of $0.0045 per share. The warrants were exercisable upon the achievement of certain triggering events, as defined in the warrant agreements. On December 2, 2016, a triggering event, as defined in the warrant agreement, had been achieved and all warrants were fully exercised.

X
- Definition Warrants disclosure. + References No definition available. + Details
Name: | snd_WarrantsDisclosureTextBlock
Namespace Prefix: | snd_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_TextBlockAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration